Section 15885
ODOR REDUCTION SYSTEM
PART 1 - GENERAL
1.1 THE REQUIREMENT
A. The Work specified herein shall include designing, furnishing and installing all equipment and materials necessary to provide a completely operational Odor Control System. The system shall be a completely packaged multi-stage, scrubber system with carbon adsorbers. The CONTRACTOR shall be responsible for providing a complete Odor Control System which shall include, but not limited to scrubbers, demister, nozzles, internal media, chemicals feed pumps, recirculation pumps, air supply fans, ducting, dampers, carbon polisher system, exhaust stack, sampling and monitoring instruments, chemical storage tanks, chemical piping, valves and appurtenances, system controls and all necessary accessories.
1.2 DESCRIPTION
A. Multi-Stage Package System: The Supplier shall furnish and install three complete single pass, pre-piped, wired, and packaged odor control systems, each including an integral absorber with three chemical scrubbing stages, two mist eliminators, exhaust fan, chemical storage tanks, chemical recirculation pumps, chemical metering pumps, piping, valves, dampers, exhaust stacks, fittings, ductwork, instrumentation, controls and all other equipment and accessories as specified to provide three complete and functioning systems.
B. Carbon Adsorber Polisher System: The Supplier shall furnish two vessels adsorber beds shall which shall be part of the odor control system and integrally operated and controlled with the scrubbers. The carbon adsorbers shall include the carbon vessels each with two beds of carbon, virgin carbon material, exhaust stacks, piping, valves, dampers, ductwork, sampling ports, instrumentation, controls and all other equipment and accessories as specified to provide complete and functioning systems.
C. The odor reduction manufacturer shall review the Contract Drawings and this section of the Specifications to assure all equipment necessary for a fully operational system is provided.
1. If additional equipment, piping, controls, conduit and wiring or miscellaneous items are required above those shown or specified, manufacturer shall design, furnish, and install such equipment.
2. Additional equipment piping, controls, conduit and wiring or miscellaneous items required must be of a quality that is at least equal in terms of materials and efficiency as specified herein.
1.3 RELATED WORK SPECIFIED ELSEWHERE
A. The requirements of the following sections and divisions apply to the Work of this section. Other sections and divisions of the Specifications, not referenced below, shall also apply to the extent required for proper performance of this Work.
1. Division 01, Additional General Requirements
2. Section 09800, Protective Coating
D. The ENGINEER reserves the right to be present at the fabricators facility for visual inspection of equipment to be supplied.
E. Results for tests performed on randomly selected sample of fiberglass sections to determine tensile and flexural properties per ASTM D 638 and 790 shall be provided for the engineer’s review prior to shipment.
F. Upon completion of the installation, each piece of equipment and each system shall be tested for satisfactory operation without excessive noise, vibration, overheating, etc. Compliance shall be based on the equipment manufacturer's specifications and all applicable costs to meet those standards shall be borne by the CONTRACTOR. All equipment must be adjusted and checked for misalignment, clearances, supports, and adherence to safety standards.
G. The CONTRACTOR shall be responsible for the successful startup and testing of each odor control facility. The CONTRACTOR shall provide all necessary facilities, manpower, chemicals, tools, instrumentation, and laboratory testing services required during this phase of the Work.
1.7 WARRANTY
A. The odor control system and all components specified in this Section shall be warranted by the manufacturer for a minimum two (2) year period after beneficial occupancy of the Work pursuant to “Use Prior to Final Completion” of the General Conditions, against defects in workmanship and materials.
B. Pumps, instruments and controls warranty shall be for one (1) year from the day of beneficial occupancy.
C. The warranty does not apply to the carbon media.
1.8 MANUFACTURER’S SERVICES
A. The system manufacturer's representative shall be present at the job site for the following time period; travel time excluded:
1. Twenty-four hours for inspection and certification of the installation.
2. Twenty-four hours to carryout performance testing.
3. Provide two (2) trip for three days each to complete tasks 1 and 2 above.
C. Metering Pumps Requirements: Refer to Section 11079, Pumping Equipment: Diaphragm Metering Pumps.
2.8 ACCESSORIES
A. Make-up Water Control: The direct reading rotameter shall be a variable area type with a Teflon float, Teflon encapsulated "O" rings, and CPVC fittings. The rotameter shall be of the same size as the pipe in which it is installed. The rotameter shall have a direct reading scale.
B. Scrubber Recirculation Sump Blowdown and Level Controls: The scrubber shall be operated with a manual blowdown. The rate of blowdown shall be proportional to the rate of make-up water. A low level float switch shall be provided for each sump. The float switch shall be per Section 17405.
C. Differential Pressure Gauges and Transmitters: Four magnehelic type pressure gauges and transmitters shall be provided to monitor pressure drop across the scrubber packing media and the mist eliminators. Pressure transmitters shall be installed at an elevation that is easily viewed and maintained. Transparent overlays will be included. The gauges shall be per Section 17034, Gauges, and the pressure transmitters shall be per Section 17405, Process Instrumentation and Control.
D. Pressure Gauges: A liquid-filled stainless steel pressure gauge, including an all CPVC plastic gauge isolator/guard and an isolation valve, shall be provided for installation in the recirculation pump discharge piping. The gauge shall have a minimum dial size of 3-1/2 inches. The gauge face shall indicate units of measurement and the normal operating reading shall be near the midpoint of the range.
E. Recirculation Pump Flow: A magnetic flow meter shall be installed on the discharge pipe of each recirculation pump. The flow meter size shall be the same as the discharge pipe. The flow meter shall use wetted material compatible with the recirculation fluid. Acceptable wetted materials include Teflon, PVDF or TEFZEL. Flow meter connection shall be flanged.
F. Overflow Control: An overflow line equipped with an internal
water seal shall maintain a minimum freeboard of four inches as
measured from the maximum liquid level to the top of the scrubber
sump deck.
G. NaOCl Analysis Kits: The scrubber system shall be provided with three Hach, LaMotte, Or Equal NaOCl test kits for the range of 0 percent to 1 percent to analyze scrubber sump and one Hach, LaMotte, Or Equal NaOCl test kit for the range 1 to 15 percent to analyze NaOCl storage.
H. Muriatic Acid Connection: The third stage of the scrubber shall be provided with connection to add muriatic acid to the sump. The connection shall be flanged with 2-inch CPVC piping, CPVC or PVDF ball valve with Teflon seats and O-rings and PVDF quick- disconnect coupling with cap.
I. Gas Flow Meter: An ultrasonic gas flow meter shall be installed on each inlet duct to the exhaust fans, see Section 17405, Process Instrumentation and Control for additional requirements. Working parameters:
1. Tag Numbers: 15KFE108, 15KFE138, and 15KFE168
2. Gas Flow Range: 0 to 20,000 cfm
3. Flow Velocity Range: 0 to 50 ft/sec.
4. Gas Type: Foul air.
5. Temperature Range: 20 to 130 degree F.
6. Pressure Range: 0 to 10 pounds per inch.
7. Pipe Diameter: 36 inches
8. Pipe Material: FRP
9. Wetted Parts Material: Hastelloy C.
10. Required Flow Accuracy: Plus or minus 2 percent.
2.9 FIBERGLASS EXHAUST STACK
A. Dimensions: Stack height shall be at least 2.5 times the internal diameter of stack and as required per SCAQMD regulations.
B. Design stack to withstand 120 mph winds and seismic zone No. 4 forces. C. Provide stack of free-standing design without guy wires.
D. Provide a minimum of two 4-inch air sampling ports for each stack piped down to personnel accessible height without use of ladders. Provide 4-inch ball valve with Teflon seats and “O” rings at the end of the sampling pipe. Pipe and valve shall be SCH 80
CPVC. Sampling ports shall be placed at 90 Deg. angle from each other.
E. Provide lightning protection system in accordance with NFPA regulations.
a. General: Fabrication shall be in accordance with NBS PS 15-69, ASTM D-
3299 and ASTM D-4097. All non-molded surfaces shall be coated with resin incorporating paraffin to facilitate a full cure of the surface. All cut edges, bolt holes, secondary bonds shallbe sealed with a resin coat prior to the final paraffinated resin coat.
b. Corrosion Liner: The inner surface of all laminates shall be resin rich and reinforced with one NEXUS 111-00010, Dacron 106 homopolymer Or Equal with a minimum thickness of 10 mils.The interior corrosion layer shall consist of two layers of 1 1/2 oz. per sq. ft. chopped strandmat. The total corrosion liner thickness shall be a minimum of 100 mils.
c. Structural Laminate: Structural laminates shall consist of alternating layers of
1-1/2 oz per sq. ft mat or chopped glass and 24 oz per sq. yard woven roving applied to reacha designed thickness. The exterior shall be surface coated with white gel coat containing ultraviolet light inhibitors.
5. Fittings: The vessel shall be fitted with the following fittings: Top Manways, Two Side Manways,Drains with Valves, Carbon Sample Ports, Differential Pressure Gauges, Grounding Rods, AnchorLugs and Lifting Lugs.
G. Carbon Adsorber Vessel Accessories:
1. Differential Pressure Gauge and Transmitter: A differential pressure gauge shall be provided to continuously monitor the pressure drop across each carbon bed. The differential pressure gauge shall be isolated with isolation valves and shall be mounted on the vessel.
2. Carbon Sample Probes: Each carbon bed shall have three (3) 1 inch diameter sample probes per bed which shall extend into the bed a minimum of 12 inches. The sample probes shall be blocked off with a ball valve constructed of PVC.
3. Grounding Rod: A stainless steel rod shall be provided to adequately ground each carbon bed. Rods shall be grounded via a 10 gauge wire.
4. Carbon Support Grating and Screen: Each adsorber vessel shall be furnished to accommodate two beds of activated carbon having an average depth of three feet. The carbon bed shall be supported on a polypropylene screen through an FRP support grating system. The screen and the support system shall be removable through the top cover. The support system shall consist of removable grating. Pall rings or other dumped packing media as a means of carbon support will not be acceptable. The support system shall be designed to withstand a load of at least 150 lbs/ft2 with a minimum deflection of 1/4 inch under all conditions.
5. Access Manways: The vessel shall have 36-inch diameter top access manway and side access manway.
6. Exhaust Stack: The adsorber shall be provided with a straight outlet with no caps. The exhaust shall be designed to prevent rain water from reaching the carbon beds. For stack design requirements refer to Section 2.9.
7. Anchor Bolts: The Carbon Adsorber shall be provided with properly sized epoxy anchor system.
8. Equipment Tags: The vessel shall be provided with an I.D. Tag with the following minimum information: Carbon Type, Vessel Dimensions, Date of Manufacture, and Design Conditions.
H. Gas Flow Meter: An ultrasonic gas flow meter shall be installed on the inlet duct to each activated carbon adsorber, see Section 17405, Process Instrumentation and Control for additional requirements. Working parameters:
1. Tag Numbers: 15KFE137 and 15KFE197
2. Gas Flow Range: 0 to 20,000 cfm
3. Flow Velocity Range: 0 to 50 ft/sec.
4. Gas Type: Foul air.
5. Temperature Range: 20 to 130 degrees F.
6. Pressure Range: 0 to 5 pounds per inch.
7. Pipe Diameter: 36 inches.
8. Pipe Material: FRP.
9. Wetted Parts Material: Hastelloy C.
10. Required Flow Accuracy: Plus or minus 2 percent.
I. Activated Carbon Media: The media shall be virgin vapor-phase pelletized activated carbon manufactured from a high grade metallurgical coal (anthracite) coconut shells or bituminous coal.
1. The media shall posses both a high surface area and a large internal pore volume.
2. The media shall have a high adsorption capacity for odorous compounds and volatile organic compounds (VOCs); and shall have high retention for retaining and preventing the desorption of previously adsorbed organic compounds.
3. The media shall have the following properties:
Item
Description/Value
Carbon Type
Vapor-phase
Type
Pelletized
Pellet Diameter, mm (min)
4.0 – 4.25
Surface Area (B.E.T. – m2/g) (min)
1,000
Hardness Number, wt percent (min.) Per ASTM D-2862
95
Butane Number, wt percent (min.)
23.5
Item
Description/Value
Moisture Content, wt. percent (max.) Per ASTM D-2867
3
Ash Content, wt percent (max)
8
CTC Activity, wt percent (typical)
60
CTC Retentivity, wt percent
25 – 30
Apparent bulk density, g/cc
0.41 – 0.53
2.11 SOURCE QUALITY CONTROL A. Fiberglass Vessels:
1. Hydrostatically test prior to shipment, with water to the straight-side height of the vessel for a minimum of 24 hours.
2. The water must be held with no visible signs of leaks or excessive wall deflection.
3. ENGINEER reserves the right to be present at the fabricator's facility during testing.
4. Notify ENGINEER two (2) weeks prior to the performance of the test.
5. Minimum two (2) burn tests of cutouts from areas where access doors, or piping cutouts are required to verify glass resin ratio
B. Activated Carbon:
1. For each 10,000-pound maximum carbon lot, submit test report from independent testing laboratory for the verifying hydrogen sulfide breakthrough capacity, moisture content, maximum head loss through the activated carbon, minimum total ash content, iodine number, and carbon tetrachloride activity.
2. The determination of H2S breakthrough capacity will be made by passing a moist (85 percent R.H.) air stream containing 1 percent H2S at a rate of 1,450 cc/min through a 19 millimeter DIA by 9 inches deep bed of uniformly packed activated carbon and monitored to 50 ppm breakthrough.
a. Results are expressed in grams H2S removed per cc of carbon.
2.12 INSTRUMENTATION AND SYSTEM CONTROLS
A. Local control panels shall be provided for each scrubber to house the pH and ORP analyzers and a separate panel to house the damper controls as shown on the P&IDs. The exhaust fans and recirculation pumps shall be provided with local controls at the MCC as shown on the P&IDs. The metering pumps shall be provided with a local control panel as shown on the P&IDs.
B. Local control panel enclosures shall be of 316 stainless steel construction and rated NEMA 4X. The panels shall be mounted remotely from the scrubber assembly and factory tested to full operation with all other components prior to shipment. NFPA 820
Option: One local panel shall be provided for each metering pump and shall include the components shown on the P&IDs.
C. pH and ORP analyzers shall be as specified in Section 17160, Analyzers.
2.13 SPECIAL TOOLS AND SPARE PARTS
A. All special tools required for normal operation and maintenance of the equipment shall be furnished with the equipment by the Manufacturer. The operation and maintenance manual shall identify each such tool and where it is used.
B. The following spare parts for approximately two years of operation shall be provided:
1. One complete set of fan belts for each fan
2. Provide one complete set of fan bearings for each fan.
3. Provide three replacement pH probs.
4. Provide two replacement ORP probs.
C. Spare parts shall be packed in containers which are suitable for storage and which are clearly labeled with indelible markings that indicate the part number and the name of the part contained therein.
PART 3 - EXECUTION
3.1 SHIPPING, STORAGE AND HANDLING
A. All parts shall be properly protected so that no damage or deterioration will occur in transit or during prolonged storage at the site. All equipment shall be shrink-wrapped with proper ventilation ports prior to shipment.
B. All openings in equipment shall be protected against entry of foreign objects.
C. Each box, crate or package shall be properly marked to show its contents and net weight.
3.2 IDENTIFICATION
A. The odor control scrubber system and the chemical storage tanks shall be identified with the health, flammability and reactivity of hazardous materials as required by codes.
3.3 INSTALLATION
A. Install odor control system.
B. Coordinate scrubber vessel anchoring method with other trades and vessel manufacturer.
C. Piping and Equipment - General:
1. Utilize template for location of unit anchorage.
2. Align, level, wedge and plumb units to match piping interfaces as shown on
Contract Drawings.
3. Exercise care in bolting flanged joints so that there is no restraint in the opposite end of pipe or fitting which would prevent uniform gasket pressure at connection or would cause unnecessary stresses to be transmitted to equipment flanges.
4. Tighten flange bolts at uniform rate which will result in uniform gasket compression over entire area of joint.
a. Provide tightening torque in accordance with manufacturer's recommendations.
5. Support and match flange faces to uniform contact over their entire face area prior to installation of any bolt between the piping flange and equipment connecting flange.
6. Permit piping connecting to equipment to freely move in directions parallel to longitudinal centerline when and while bolts in connection flange are tightened.
7. Grout equipment into place prior to final bolting of piping but not before initial fitting and alignment.
a. To provide maximum flexibility and ease of alignment, assemble connecting piping with gaskets in place and minimum of four (4) bolts per joint installed and tightened.
b. Test alignment by loosening flange bolts to see if there is any change in relationship of piping flange with equipment connecting flange.
c. Realign as necessary, install flange bolts and make equipment connection.
8. Utilize anchor bolts and nuts (two (2) nuts per bolt) to secure equipment.
D. Install control panels so visual observation and necessary adjustments can be made from floor level.
3.4 MAINTENANCE OF INSTALLED EQUIPMENT, GATES AND VALVES
A. Maintain the operability and functionality of all installed equipment, gates and valves between the time of installation and the commissioning period. See Specification section
01660, Shipping, Storage and Handling Requirements.
3.5 MANUFACTURER’S FIELD SERVICES
A. Furnish the services of authorized technical representatives of the Manufacturer to assist/inspect the installed equipment and to certify that the equipment has been properly installed and is ready to operate, train OCSD personnel, conduct pre-operational mechanical checkout of the equipment, place equipment into operation, optimize the performances of the equipment and perform the field performance testing.
B. At a minimum, conduct three separate site visits as follows:
1. Inspection of equipment installation (16 hours minimum)
2. Training of OCSD personnel. See Specification section 01820 for requirements.
3. Commissioning. See Specification section 01810 for requirements. Number of hours shall be as required to meet all testing and commissioning requirements, but shall not be less than 40 hours.
3.6 FIELD QUALITY CONTROL A. Fiberglass Vessels Test:
1. Hydrostatically test all vessels with water to the straight-side height of the vessel after field installation is complete.
2. Hold water for a minimum of 24 hours with no visible signs of leaks or excessive wall deflection.
3.7 TESTING REQUIREMENTS AND START-UP
A. Test Procedures: The time of the tests and detailed test procedure shall be submitted for approval prior to the testing period. In the event ammonia or hydrogen sulfide levels are below anticipated levels, the CONTRACTOR shall augment the levels in the influent airstream so that the concentrations are WITHIN -2 to +10 ppm of the design level.
1. The CONTRACTOR shall submit written testing plan detailing all procedures, sampling locations, analytical procedures, laboratory services to be used, laboratory certification by the appropriate State Authority, sampling apparatus, sample transportation procedures, chain of custody forms and qualification of personnel conducting the test.
2. During testing, chemical feed, scrubber overflow, recirculation and scrubber air flow rates shall be held constant. Changes in scrubber system operating conditions shall not be permitted. All fine-tuning of operating conditions shall be performed prior to testing.
3. Design operating conditions shall be maintained for a minimum of eight hours. During this time, all pertinent operating parameters shall be monitored and recorded and sufficient sampling and analysis shall be conducted to demonstrate that the air flow rate and removal efficiency are at the design conditions.
4. Ammonia and hydrogen sulfide concentrations shall be measured in each scrubber inlet and outlet. As a minimum, the test shall be conducted for 2-hour at the average levels, 2 hour at the peak levels, and the balance of 4 hours on actual plant odor conditions. Inlet and outlet levels shall be measured once every 30 minutes using gas detection tubes such as Draeger, RAE Or Equal or a portable analyzer such as Interscan, Field Environmental Instruments, Or Equal.
5. Results: A description of the performance tests shall be submitted. The ammonia and hydrogen sulfide compound removal efficiencies shall be as specified in the design and performance requirements. Should scrubber system performance not meet any of the above requirements, that system shall have failed the performance tests. The CONTRACTOR shall make any additions or modifications to that scrubber system as may be necessary, at no additional cost to OCSD, and the performance tests for that system shall be repeated in its entirety.
6. All testing costs shall be borne by CONTRACTOR. B. Odor Panel Testing:
1. An odor panel test shall be performed with natural plant odors.
2. The CONTRACTOR shall guarantee that exhaust emissions will not exceed the specified levels. The CONTRACTOR shall provide the following testing and submit analytical results to the OCSD and ENGINEER.
3. The CONTRACTOR shall submit written testing plan detailing all procedures, sampling locations, analytical procedures, laboratory services to be used, laboratory certification by the appropriate State Authority, sampling apparatus, sample transportation procedures, chain of custody forms and qualification of personnel conducting the test.
4. Each test shall consist of three (3) sets of samples taken over an eight hours period. Each set consists of two background two inlet and two outlet samples shall be drawn while conducting the odor control system performance testing.
a. Samples of ambient air upwind of the process shall be drawn as a blank.
5. These samples shall be collected, marked, transported, and tested off-site in a controlled laboratory environment by an independent testing facility using evaluation procedure ASTM E679 “Air Quality Determination of Odor Concentration by Dynamic Olfactometry”. All samples shall be evaluated within 24 HRS.
6. Samples shall be taken and transported in a manner which minimizes alteration of the samples either by contamination or loss of odorous material.
7. The results shall be determined based on subtracting both the inlet and outlet results from the average background result and based on a presentation rate of 20
L/min.
a. Average ED(50) results shall be calculated where the average blank result is subtracted from both inlet and outlet readings.
b. Prepare a test report and submit to the ENGINEER include procedures, data, calculations, and results.
8. If the odor control system fails to meet the performance criteria of this Section, it will be the CONTRACTOR's responsibility to make all modifications necessary to improve performance at no cost to OCSD.
9. CONTRACTOR shall pay for all additional testing required to verify that performance criteria are being met.
10. Successful Completion of this Testing: Used as one (1) of the considerations in
Final Acceptance of the system.
11. All testing costs shall be borne by CONTRACTOR.
C. Start-up: The services of a factory representative shall be provided as specified in
Section 1.8 to insure proper installation and start-up of the scrubber system.
3.8 CHEMICALS
A. All start-up and testing chemicals shall be provided by the CONTRACTOR. Top off all chemical tanks (NaOCl, NaOH, and H2SO4) after testing and start-up is completed.
ODOR REDUCTION SYSTEM
PART 1 - GENERAL
1.1 THE REQUIREMENT
A. The Work specified herein shall include designing, furnishing and installing all equipment and materials necessary to provide a completely operational Odor Control System. The system shall be a completely packaged multi-stage, scrubber system with carbon adsorbers. The CONTRACTOR shall be responsible for providing a complete Odor Control System which shall include, but not limited to scrubbers, demister, nozzles, internal media, chemicals feed pumps, recirculation pumps, air supply fans, ducting, dampers, carbon polisher system, exhaust stack, sampling and monitoring instruments, chemical storage tanks, chemical piping, valves and appurtenances, system controls and all necessary accessories.
1.2 DESCRIPTION
A. Multi-Stage Package System: The Supplier shall furnish and install three complete single pass, pre-piped, wired, and packaged odor control systems, each including an integral absorber with three chemical scrubbing stages, two mist eliminators, exhaust fan, chemical storage tanks, chemical recirculation pumps, chemical metering pumps, piping, valves, dampers, exhaust stacks, fittings, ductwork, instrumentation, controls and all other equipment and accessories as specified to provide three complete and functioning systems.
B. Carbon Adsorber Polisher System: The Supplier shall furnish two vessels adsorber beds shall which shall be part of the odor control system and integrally operated and controlled with the scrubbers. The carbon adsorbers shall include the carbon vessels each with two beds of carbon, virgin carbon material, exhaust stacks, piping, valves, dampers, ductwork, sampling ports, instrumentation, controls and all other equipment and accessories as specified to provide complete and functioning systems.
C. The odor reduction manufacturer shall review the Contract Drawings and this section of the Specifications to assure all equipment necessary for a fully operational system is provided.
1. If additional equipment, piping, controls, conduit and wiring or miscellaneous items are required above those shown or specified, manufacturer shall design, furnish, and install such equipment.
2. Additional equipment piping, controls, conduit and wiring or miscellaneous items required must be of a quality that is at least equal in terms of materials and efficiency as specified herein.
1.3 RELATED WORK SPECIFIED ELSEWHERE
A. The requirements of the following sections and divisions apply to the Work of this section. Other sections and divisions of the Specifications, not referenced below, shall also apply to the extent required for proper performance of this Work.
1. Division 01, Additional General Requirements
2. Section 09800, Protective Coating
3. Section 11079, Pumping Equipment: Diaphragm Metering Pumps
4. Section 11210, Pumps, General
5. Section 15000, Piping, General
6. Section 15064, Pipe, Plastic
7. Section 15100, Valves, General
8. Section 15101, Valve Operators
9. Section 15115, Miscellaneous Valves
10. Section 15810, Fiberglass Ducting
11. Section 16010, Electrical General Provisions
12. Section 16050, Basic Materials and Methods
13. Section 16075, Electrical Identification Nameplates and Warning Signs
14. Section 16120, Conductors and Cables
15. Section 16130, Raceway Systems and Pull Boxes
16. Section 16442, Control Panels
17. Section, 17034 Gauges
18. Section 17160, Analyzers
19. Section 17405, Process Instrumentation and Control
20. Section 17410, Programming by Contractor
1.4 REFERENCE SPECIFICATIONS, CODES, AND STANDARDS
A. All Work specified herein shall conform to or exceed the applicable requirements of the referenced portions of the following publications to the extent that the provisions thereof are not in conflict with other provisions of these Specifications.
B. Comply with the applicable editions of the following codes, regulations and standards.
1. Industry Standards:
ASME B73.1M Horizontal End Suction Centrifugal Pumps for
Chemical Process
ASTM C-582 Standard Specification for Contact-Molded Reinforced Thermosetting Plastic (RTP) Laminates for Corrosion-Resistant Equipment
ASTM D-638 Test Method for Tensile Properties of Plastics
4. Section 11210, Pumps, General
5. Section 15000, Piping, General
6. Section 15064, Pipe, Plastic
7. Section 15100, Valves, General
8. Section 15101, Valve Operators
9. Section 15115, Miscellaneous Valves
10. Section 15810, Fiberglass Ducting
11. Section 16010, Electrical General Provisions
12. Section 16050, Basic Materials and Methods
13. Section 16075, Electrical Identification Nameplates and Warning Signs
14. Section 16120, Conductors and Cables
15. Section 16130, Raceway Systems and Pull Boxes
16. Section 16442, Control Panels
17. Section, 17034 Gauges
18. Section 17160, Analyzers
19. Section 17405, Process Instrumentation and Control
20. Section 17410, Programming by Contractor
1.4 REFERENCE SPECIFICATIONS, CODES, AND STANDARDS
A. All Work specified herein shall conform to or exceed the applicable requirements of the referenced portions of the following publications to the extent that the provisions thereof are not in conflict with other provisions of these Specifications.
B. Comply with the applicable editions of the following codes, regulations and standards.
1. Industry Standards:
ASME B73.1M Horizontal End Suction Centrifugal Pumps for
Chemical Process
ASTM C-582 Standard Specification for Contact-Molded Reinforced Thermosetting Plastic (RTP) Laminates for Corrosion-Resistant Equipment
ASTM D-638 Test Method for Tensile Properties of Plastics
ASTM D-790 Standard Test Methods for Flexural Properties of
Unreinforced and Reinforced Plastics and Electrical Insulating
Materials
ASTM D-883 Definition of Terms Relating to Plastics
ASTM D1784 Standard Specification for Rigid Poly(Vinyl Chloride) (PVC) Compounds and Chlorinated Poly(Vinyl Chloride) (CPVC) Compounds
ASTM D-2583 Test for Indentation Hardness of Rigid Plastics by Means of Barcol Impressor
ASTM D2584 Standard Test Method for Ignition Loss of Cured
Reinforced Resins
ASTM D-2563 Recommended Practice for Classifying Visual Defects in Glass Reinforced Plastic Laminate Parts
ASTM D2854 Standard Test Method for Apparent Density of
Activated Carbon
ASTM D2862 Standard Test Method for Particle Size
Distribution of Granular Activated Carbon
ASTM D3299 Standard Specification for Filament-Wound Glass-Fiber-Reinforced Polyester Chemical- Resistant Tanks
ASTM D3467 Standard Test Method for Carbon Tetrachloride
Activity of Activated Carbon
ASTM D3802 Standard Test Method for Ball-Pan Hardness of
Activated Carbon
ASTM D4097 Standard Specification for Contact-Molded Glass-Fiber-Reinforced Thermoset Resin Chemical-Resistant Tanks
ASTM E679 Standard Practice for Determination of Odor and Taste Thresholds by a Forced-Choice Ascending Concentration Series Method of Limits
AWWA B604 Standard for Granular Activated Carbon
NBS PS15 Custom Contact-Molded Reinforced Polyester
Chemical-Resistant Process Equipment
NEMA 250 Enclosures for Electrical Equipment (1000 Volts
Maximum)
NFPA 780 Standard for the Installation of Lightning
Protection Systems
NEPA 820 Standard for Fire Protection in Wastewater
Treatment and Collection Facilities
ASTM D-883 Definition of Terms Relating to Plastics
ASTM D1784 Standard Specification for Rigid Poly(Vinyl Chloride) (PVC) Compounds and Chlorinated Poly(Vinyl Chloride) (CPVC) Compounds
ASTM D-2583 Test for Indentation Hardness of Rigid Plastics by Means of Barcol Impressor
ASTM D2584 Standard Test Method for Ignition Loss of Cured
Reinforced Resins
ASTM D-2563 Recommended Practice for Classifying Visual Defects in Glass Reinforced Plastic Laminate Parts
ASTM D2854 Standard Test Method for Apparent Density of
Activated Carbon
ASTM D2862 Standard Test Method for Particle Size
Distribution of Granular Activated Carbon
ASTM D3299 Standard Specification for Filament-Wound Glass-Fiber-Reinforced Polyester Chemical- Resistant Tanks
ASTM D3467 Standard Test Method for Carbon Tetrachloride
Activity of Activated Carbon
ASTM D3802 Standard Test Method for Ball-Pan Hardness of
Activated Carbon
ASTM D4097 Standard Specification for Contact-Molded Glass-Fiber-Reinforced Thermoset Resin Chemical-Resistant Tanks
ASTM E679 Standard Practice for Determination of Odor and Taste Thresholds by a Forced-Choice Ascending Concentration Series Method of Limits
AWWA B604 Standard for Granular Activated Carbon
NBS PS15 Custom Contact-Molded Reinforced Polyester
Chemical-Resistant Process Equipment
NEMA 250 Enclosures for Electrical Equipment (1000 Volts
Maximum)
NFPA 780 Standard for the Installation of Lightning
Protection Systems
NEPA 820 Standard for Fire Protection in Wastewater
Treatment and Collection Facilities
PS 15-69 National Bureau of standards Voluntary Product Standard
"Custom contact molded Reinforced Polyester Chemical Resistant
Process Equipment"
2. Other Standards:
AMCA Air Movement and Control Association
OSHA Occupational Safety and Health Administration
CBC California Building Code
NEC National Electrical Code
lEC International Electrotechnical Commission
C. Comply with the applicable reference Specifications as directed in the General
Requirements and Additional General Requirements.
1.5 CONTRACTOR SUBMITTALS
A. Submittals shall be made in accordance with the General Requirements, Additional
General Requirements and as specified herein.
B. The CONTRACTOR shall submit complete scrubber and adsorbers system drawings, together with all piping, ductwork, valves, and controls for review by the ENGINEER.
C. The CONTRACTOR shall submit the following information for approval before equipment is fabricated:
1. Drawings of system showing assemblies, arrangements, piping, electrical, mounting details, equipment outline dimensions, fitting size and location, motor data, operating weights of all equipment and sufficient information to allow the ENGINEER to check clearances, connections, and conformance with the Specifications.
2. Materials of construction for all equipment. Strengths of Tensile and Flexural Properties of the FRP laminate from which the carbon and chemical scrubbers are to be made of.
3. Manufacturer's catalog data, operating literature, specifications, performance and calibration curves for chemical recycle pumps, exhaust fan, and auxiliary components.
4. The Manufacturer shall furnish all important details of construction including dimensions, process and instrumentation diagrams, sequence of operation, and installation instructions.
5. Complete instrumentation, control, logic and power wiring diagrams in sufficient detail to allow installation of the instrumentation, controls, and electrical components.
6. Manuals: Furnish manufacturer's installation recommendations, bulletins, and spare parts lists.
2. Other Standards:
AMCA Air Movement and Control Association
OSHA Occupational Safety and Health Administration
CBC California Building Code
NEC National Electrical Code
lEC International Electrotechnical Commission
C. Comply with the applicable reference Specifications as directed in the General
Requirements and Additional General Requirements.
1.5 CONTRACTOR SUBMITTALS
A. Submittals shall be made in accordance with the General Requirements, Additional
General Requirements and as specified herein.
B. The CONTRACTOR shall submit complete scrubber and adsorbers system drawings, together with all piping, ductwork, valves, and controls for review by the ENGINEER.
C. The CONTRACTOR shall submit the following information for approval before equipment is fabricated:
1. Drawings of system showing assemblies, arrangements, piping, electrical, mounting details, equipment outline dimensions, fitting size and location, motor data, operating weights of all equipment and sufficient information to allow the ENGINEER to check clearances, connections, and conformance with the Specifications.
2. Materials of construction for all equipment. Strengths of Tensile and Flexural Properties of the FRP laminate from which the carbon and chemical scrubbers are to be made of.
3. Manufacturer's catalog data, operating literature, specifications, performance and calibration curves for chemical recycle pumps, exhaust fan, and auxiliary components.
4. The Manufacturer shall furnish all important details of construction including dimensions, process and instrumentation diagrams, sequence of operation, and installation instructions.
5. Complete instrumentation, control, logic and power wiring diagrams in sufficient detail to allow installation of the instrumentation, controls, and electrical components.
6. Manuals: Furnish manufacturer's installation recommendations, bulletins, and spare parts lists.
D. Manufacturer shall submit wind load calculations and seismic
calculations for the scrubbers, carbon adsorbers, and stacks. All
calculations shall be stamped and signed by a qualified licensed
professional engineer in the State of California.
E. In accordance with the General Requirements, Additional General Requirements and as specified herein, submit bounded copies of operation and maintenance instructions. The information shall be sufficient to instruct personnel who are unfamiliar with such equipment in the operation and maintenance of the system. It shall include diagnostic procedures to be used in the event of system shutdown or malfunction.
1.6 QUALITY ASSURANCE
A. Manufacturer: The products furnished under this section shall be by a manufacturer who has been regularly engaged in the design and manufacture of the equipment and who has a minimum of 10 years experience in design, fabrication and testing of packaged odor control systems of the size, materials and scope specified herein, and shall show evidence of at least ten similar packaged design installations in satisfactory operation in wastewater treatment plant facilities for at least three (3) years. Demonstrate to the satisfaction of the ENGINEER that the quality is equal to equipment made by those manufacturers specifically named herein. Demonstrate to the satisfaction of the ENGINEER that the system conforms to physical footprint and packaged unitary requirements. Any manufacturer whose main business is FRP manufacturing and who cannot demonstrate the required experience and specialization in odor control design and system integration shall not be accepted as a supplier of the complete system.
B. The odor control system manufacturer shall have complete ongoing service capability with factory trained personnel. The service center shall be located in California. The service center shall be licensed to conduct business in California where the odor control system is located and service center personnel shall be able to provide the following services: furnishing system operational analyses consisting of field H2S measurements, airflow measurements, operational trouble shooting, and general maintenance. A manufacturer’s sales representative office shall not be acceptable.
C. Inspection and Testing Requirements: The ENGINEER reserves the right to reject delivery of any or all pieces of equipment found, upon inspection, to have any or all of the following: blisters, chips, crazing, exposed glass, cracks burned areas, dry spots, foreign matter, surface porosity, sharp discontinuity or entrapped air at the surface of the laminate. Any item which does not satisfy the tolerances as below shall be rejected:
E. In accordance with the General Requirements, Additional General Requirements and as specified herein, submit bounded copies of operation and maintenance instructions. The information shall be sufficient to instruct personnel who are unfamiliar with such equipment in the operation and maintenance of the system. It shall include diagnostic procedures to be used in the event of system shutdown or malfunction.
1.6 QUALITY ASSURANCE
A. Manufacturer: The products furnished under this section shall be by a manufacturer who has been regularly engaged in the design and manufacture of the equipment and who has a minimum of 10 years experience in design, fabrication and testing of packaged odor control systems of the size, materials and scope specified herein, and shall show evidence of at least ten similar packaged design installations in satisfactory operation in wastewater treatment plant facilities for at least three (3) years. Demonstrate to the satisfaction of the ENGINEER that the quality is equal to equipment made by those manufacturers specifically named herein. Demonstrate to the satisfaction of the ENGINEER that the system conforms to physical footprint and packaged unitary requirements. Any manufacturer whose main business is FRP manufacturing and who cannot demonstrate the required experience and specialization in odor control design and system integration shall not be accepted as a supplier of the complete system.
B. The odor control system manufacturer shall have complete ongoing service capability with factory trained personnel. The service center shall be located in California. The service center shall be licensed to conduct business in California where the odor control system is located and service center personnel shall be able to provide the following services: furnishing system operational analyses consisting of field H2S measurements, airflow measurements, operational trouble shooting, and general maintenance. A manufacturer’s sales representative office shall not be acceptable.
C. Inspection and Testing Requirements: The ENGINEER reserves the right to reject delivery of any or all pieces of equipment found, upon inspection, to have any or all of the following: blisters, chips, crazing, exposed glass, cracks burned areas, dry spots, foreign matter, surface porosity, sharp discontinuity or entrapped air at the surface of the laminate. Any item which does not satisfy the tolerances as below shall be rejected:
-
Defect
Inside Surface
Outside Surface
Blister
None
Max. dimensions: 1/4 inch diameter by 1/8 inch high; Max density: 1 per sq. ft.; Min. separation: 2 inches apart
Chips
None
Max. dimension of break: 1/4 inch and thickness no greater than 10 percent of wall thickness;
Max. density: 1 per sq. ft.
Crazing
None
Max. length: 1/2 inch; Max. density: 5 per sq. ft.; Min. separation: 2”
Cracks
None
None
Exposed Glass
None
None
Scratches
None
Max. length: 1 inch; Max. depth:
0.010”
-
Defect
Inside Surface
Outside Surface
Burned Areas
None
None
Surface Porosity
None
None
Foreign Matter
None
None
Sharp Discontinuity
None
None
Pits
Max. 1/8 inches, dia. by 1/32 inches deep; Max: 10 per ft2
Max. 1/8 inch dia. by 1/16 inch deep; Max: 10 per sq. ft.
Dry Spot
None
2 sq. in. per sq. ft.
Entrapped Air
None at the surface 1/16 inches and 10 per square in. max
1/8 inch and 4 per sq. in. or 1/16 inch and 10 per sq. in. within laminate
D. The ENGINEER reserves the right to be present at the fabricators facility for visual inspection of equipment to be supplied.
E. Results for tests performed on randomly selected sample of fiberglass sections to determine tensile and flexural properties per ASTM D 638 and 790 shall be provided for the engineer’s review prior to shipment.
F. Upon completion of the installation, each piece of equipment and each system shall be tested for satisfactory operation without excessive noise, vibration, overheating, etc. Compliance shall be based on the equipment manufacturer's specifications and all applicable costs to meet those standards shall be borne by the CONTRACTOR. All equipment must be adjusted and checked for misalignment, clearances, supports, and adherence to safety standards.
G. The CONTRACTOR shall be responsible for the successful startup and testing of each odor control facility. The CONTRACTOR shall provide all necessary facilities, manpower, chemicals, tools, instrumentation, and laboratory testing services required during this phase of the Work.
1.7 WARRANTY
A. The odor control system and all components specified in this Section shall be warranted by the manufacturer for a minimum two (2) year period after beneficial occupancy of the Work pursuant to “Use Prior to Final Completion” of the General Conditions, against defects in workmanship and materials.
B. Pumps, instruments and controls warranty shall be for one (1) year from the day of beneficial occupancy.
C. The warranty does not apply to the carbon media.
1.8 MANUFACTURER’S SERVICES
A. The system manufacturer's representative shall be present at the job site for the following time period; travel time excluded:
1. Twenty-four hours for inspection and certification of the installation.
2. Twenty-four hours to carryout performance testing.
3. Provide two (2) trip for three days each to complete tasks 1 and 2 above.
4. Instruct OCSD's personnel on operation and maintenance
including safe chemical handling procedures:
a. Twelve hours of classroom and field instructions.
b. A maximum of 6-hour instructions shall be scheduled on equipment per day.
5. Provide two additional trips, each for up to one (1) days at the job site during the first year of operation for system operation checkout by a factory trained technical employee of the manufacturer. Technical representative shall verify airflow rate through the system and take system inlet and outlet H2S and NH3 measurements.
PART 2 - PRODUCTS
2.1 GENERAL
A. The CONTRACTOR shall provide three odor control systems specified which shall each treat the odorous air from the contaminated areas in a single pass. Each system shall be designed for continuous and automatic operation. However, provisions shall be made to allow the systems to be capable of manual operation. The scrubber blowdown streams shall be discharged into a chemical drain. Access manways shall be provided to allow access to the internals of the scrubbers. The scrubber systems shall be designed to withstand a temperature up to 130 degrees F. The scrubbers shall be multi-stage packaged FRP systems as specified herewith. A carbon polisher system shall be provided for the system.
B. NFPA 820 Requirements:
1. All equipment except for the electrical control panel shall be designed and fabricated in compliance with National Fire and Protection Agency Code 820. As a minimum, all equipment installed on the system shall be rated for Class I, Division 2, Group D.
2. All motors within three feet of the air stream shall be rated for Class I, Division 2, Group D.
3. Local control panels shall be mounted remotely from the scrubber system as shown on the Drawings and shipped separately. The system will be equipped with NEMA 4X 316 stainless steel junction box(s) rated for connection between the local control panels and the equipment mounted on the system. The installation and wiring of the local control panels to the scrubber mounted recirculation pumps and metering pumps along with the fan will be the responsibility of the CONTRACTOR.
2.2 ACCEPTABLE MANUFACTURERS
A. Subject to compliance with the Contract Documents, the following manufacturers are acceptable:
1. Siemens Water Technologies, San Diego, California, LO/PRO® Odor Control
System
2. Met-Pro Corporation/Duall Division, Model PTMD Odor Control System
3. Or Equal.
a. Twelve hours of classroom and field instructions.
b. A maximum of 6-hour instructions shall be scheduled on equipment per day.
5. Provide two additional trips, each for up to one (1) days at the job site during the first year of operation for system operation checkout by a factory trained technical employee of the manufacturer. Technical representative shall verify airflow rate through the system and take system inlet and outlet H2S and NH3 measurements.
PART 2 - PRODUCTS
2.1 GENERAL
A. The CONTRACTOR shall provide three odor control systems specified which shall each treat the odorous air from the contaminated areas in a single pass. Each system shall be designed for continuous and automatic operation. However, provisions shall be made to allow the systems to be capable of manual operation. The scrubber blowdown streams shall be discharged into a chemical drain. Access manways shall be provided to allow access to the internals of the scrubbers. The scrubber systems shall be designed to withstand a temperature up to 130 degrees F. The scrubbers shall be multi-stage packaged FRP systems as specified herewith. A carbon polisher system shall be provided for the system.
B. NFPA 820 Requirements:
1. All equipment except for the electrical control panel shall be designed and fabricated in compliance with National Fire and Protection Agency Code 820. As a minimum, all equipment installed on the system shall be rated for Class I, Division 2, Group D.
2. All motors within three feet of the air stream shall be rated for Class I, Division 2, Group D.
3. Local control panels shall be mounted remotely from the scrubber system as shown on the Drawings and shipped separately. The system will be equipped with NEMA 4X 316 stainless steel junction box(s) rated for connection between the local control panels and the equipment mounted on the system. The installation and wiring of the local control panels to the scrubber mounted recirculation pumps and metering pumps along with the fan will be the responsibility of the CONTRACTOR.
2.2 ACCEPTABLE MANUFACTURERS
A. Subject to compliance with the Contract Documents, the following manufacturers are acceptable:
1. Siemens Water Technologies, San Diego, California, LO/PRO® Odor Control
System
2. Met-Pro Corporation/Duall Division, Model PTMD Odor Control System
3. Or Equal.
2.3 DESIGN AND PERFORMANCE CRITERIA
A. Design Criteria: A total of three systems/trains shall be provided: two systems/trains shall be duty and one chemical scrubber system shall be standby. Foul air removed from the facility will have a design flow rate and odor concentrations as listed below:
1. Total Foul Air Flow Rate through the System: 40,000 cfm
2. Foul Air Flow Rate through Each Scrubber Train: 20,000 cfm
3. Initial Inlet Odor Units: 6,000 D/T
4. Average Inlet H2S Concentration: 5 ppm
5. Peak Inlet H2S Concentration: 20 ppm
6. Average Inlet NH3 Concentration: 30 ppm
B. System Performance: The odor control system shall demonstrate following performance when operating under design flow conditions listed above.
1. Odor Units: The scrubber system shall remove a minimum of 95 percent of the inlet odor units or have a maximum outlet concentration of 300 D/T, whichever is greater. These criteria include removal of odorous volatile organic compounds (VOCs) to 95 percent level.
2. Hydrogen Sulfide: The odor control system shall have a maximum of 0.1 ppm outlet concentration of H2S for inlet concentration of up to 20 ppm and shall remove a minimum of 99.0 percent H2S for concentrations in excess of the 20 ppm.
3. Ammonia: The odor control system shall have a maximum of 0.1 ppm outlet concentration of NH3 for inlet concentration of up to 30 ppm and shall remove a minimum of 99.0 percent NH3 for concentrations in excess of the 30 ppm.
2.4 MULTI-STAGE FRP PACKAGED ABSORBER SYSTEM A. Scrubber Design Criteria:
1. Working Pressure/Scrubber Portion: 10.0 inches WC
2. Liquid Storage: Hydrostatic load of specific gravity = 1.01
3. Wind Load: 120 mph
4. Live Load: 200 lbs/sq. ft
5. Ambient Temperature: 30 to 130 degrees F
A. Design Criteria: A total of three systems/trains shall be provided: two systems/trains shall be duty and one chemical scrubber system shall be standby. Foul air removed from the facility will have a design flow rate and odor concentrations as listed below:
1. Total Foul Air Flow Rate through the System: 40,000 cfm
2. Foul Air Flow Rate through Each Scrubber Train: 20,000 cfm
3. Initial Inlet Odor Units: 6,000 D/T
4. Average Inlet H2S Concentration: 5 ppm
5. Peak Inlet H2S Concentration: 20 ppm
6. Average Inlet NH3 Concentration: 30 ppm
B. System Performance: The odor control system shall demonstrate following performance when operating under design flow conditions listed above.
1. Odor Units: The scrubber system shall remove a minimum of 95 percent of the inlet odor units or have a maximum outlet concentration of 300 D/T, whichever is greater. These criteria include removal of odorous volatile organic compounds (VOCs) to 95 percent level.
2. Hydrogen Sulfide: The odor control system shall have a maximum of 0.1 ppm outlet concentration of H2S for inlet concentration of up to 20 ppm and shall remove a minimum of 99.0 percent H2S for concentrations in excess of the 20 ppm.
3. Ammonia: The odor control system shall have a maximum of 0.1 ppm outlet concentration of NH3 for inlet concentration of up to 30 ppm and shall remove a minimum of 99.0 percent NH3 for concentrations in excess of the 30 ppm.
2.4 MULTI-STAGE FRP PACKAGED ABSORBER SYSTEM A. Scrubber Design Criteria:
1. Working Pressure/Scrubber Portion: 10.0 inches WC
2. Liquid Storage: Hydrostatic load of specific gravity = 1.01
3. Wind Load: 120 mph
4. Live Load: 200 lbs/sq. ft
5. Ambient Temperature: 30 to 130 degrees F
B. General:
1. Each gas scrubber system shall be a THREE-STAGE, SINGLE PASS PACKAGED ABSORBER, designed to remove H2S, AMMONIA AND ODOR vapor in a single pass based on performance criteria stated in Section 2.3 above. The scrubber system shall consist of three vertical, counter-current gas absorption sections. The packed bed sections shall include a spray header to distribute the liquid evenly over the packing sections. All stages shall include a high efficiency low pressure drop packing media. The gases shall pass through a high efficiency mist eliminator prior to discharging stage 1 and prior to discharging stage 3 into the stack. The scrubber system shall be equipped with three self contained sumps. Each of the sumps shall be fitted with a low level switch. The complete scrubber shall be fabricated of premium grade vinyl ester resin.
2. The overall system size, including the chemical sumps, pumps, fan, controls shall be as shown on the Contract Drawings. Access manways shall be provided to allow access to the scrubber internals. As a minimum, access manways shall be provided at the top and bottom of the packing sections, chemical sumps, and the mist eliminator.
3. The system shall be included with all piping, valves, and internals. The material of construction of internals shall be as follows:
Packing Media Support: Vinyl Ester FRP grating
Packing Media: Polypropylene
Liquid Distributor: CPVC SCH 80
Spray Nozzles: Polypropylene
Mist Eliminator: Polypropylene
4. The recirculation pumps shall be mounted on the system and pre-piped. The scrubber system shall be shipped as a single piece to the extent possible.
5. The chemical metering pumps shall be installed adjacent to their respective chemical storage tank containment area and shall be connected to the scrubbers and controlled through the scrubber control system.
6. Each scrubber sump shall be equipped with a titanium or hastelloy internal grounding rod. The CONTRACTOR shall install a grounding rod adjacent to the scrubber for connection to the internal grounding rods.
C. Material of Construction:
1. The scrubber and absorber vessel and accessories shall be contact molded manufactured in accordance with NBS PS 15-69, ASTM D 4097 for contact molding. Any visual defects shall not exceed the tolerances specified in the table located in section 1.6, item C. Any material of construction other than FRP with premium grade vinyl ester resin will not be allowed on any part of the system (corrosion and structural layers).
1. Each gas scrubber system shall be a THREE-STAGE, SINGLE PASS PACKAGED ABSORBER, designed to remove H2S, AMMONIA AND ODOR vapor in a single pass based on performance criteria stated in Section 2.3 above. The scrubber system shall consist of three vertical, counter-current gas absorption sections. The packed bed sections shall include a spray header to distribute the liquid evenly over the packing sections. All stages shall include a high efficiency low pressure drop packing media. The gases shall pass through a high efficiency mist eliminator prior to discharging stage 1 and prior to discharging stage 3 into the stack. The scrubber system shall be equipped with three self contained sumps. Each of the sumps shall be fitted with a low level switch. The complete scrubber shall be fabricated of premium grade vinyl ester resin.
2. The overall system size, including the chemical sumps, pumps, fan, controls shall be as shown on the Contract Drawings. Access manways shall be provided to allow access to the scrubber internals. As a minimum, access manways shall be provided at the top and bottom of the packing sections, chemical sumps, and the mist eliminator.
3. The system shall be included with all piping, valves, and internals. The material of construction of internals shall be as follows:
Packing Media Support: Vinyl Ester FRP grating
Packing Media: Polypropylene
Liquid Distributor: CPVC SCH 80
Spray Nozzles: Polypropylene
Mist Eliminator: Polypropylene
4. The recirculation pumps shall be mounted on the system and pre-piped. The scrubber system shall be shipped as a single piece to the extent possible.
5. The chemical metering pumps shall be installed adjacent to their respective chemical storage tank containment area and shall be connected to the scrubbers and controlled through the scrubber control system.
6. Each scrubber sump shall be equipped with a titanium or hastelloy internal grounding rod. The CONTRACTOR shall install a grounding rod adjacent to the scrubber for connection to the internal grounding rods.
C. Material of Construction:
1. The scrubber and absorber vessel and accessories shall be contact molded manufactured in accordance with NBS PS 15-69, ASTM D 4097 for contact molding. Any visual defects shall not exceed the tolerances specified in the table located in section 1.6, item C. Any material of construction other than FRP with premium grade vinyl ester resin will not be allowed on any part of the system (corrosion and structural layers).
2. Resin used in fabrication shall be a premium vinyl ester type
such as Hetron 922 by Ashland Chemicals, Derakane 411 by Dow
Chemical Or Equal. The resin shall be reinforced with an inner veil
of a suitable synthetic organic fiber such as Nexus 111-
00010, Dacron 106 homopolymer, Or Equal.
3. Reinforcement: Glass fiber reinforcement used shall be commercial grade corrosion resistance borosilicate glass.
a. All glass fiber reinforcement shall be Type C chemical grade, Type E
electrical grade.
b. Surfacing veil shall be 10 mil Nexus 111-00010, Dacron 106 homopolymer, Or equal.
c. Mat shall be Type "E" (electrical grade) glass, 1 1/2 oz. per sq. ft with a nominal fiber length of 1.25 + 0.25 inches, with a silane finish and styrene soluble binder.
d. Continuous glass roving, used in chopper gun spray-up applications shall be type "E" grade with chrome or silane coupling agent.
e. Woven roving used for reinforcement shall be 24 oz. per sq. yard type "E" glass and have a 5 x 4 plain weave.
4. Miscellaneous:
a. Stainless Steel: Unless otherwise specified, all fasteners, and metal attachments, such as anchors, brackets etc shall be ANSI 316 Stainless Steel. All metals shall be compatible with the chemical in contact. CONTRACTOR shall include in submittal a material list for all metals in contact with chemicals for ENGINEER approval.
b. Gaskets: Unless otherwise specified, all gaskets shall be Teflon or Teflon encapsulated Viton as required for compatibility with the service chemicals. CONTRACTOR shall include in submittal a material list for all gasket in contact with chemicals for ENGINEER approval.
c. Fabrication:
1) General: Fabrication shall be in accordance with NBS PS 15-69 and ASTM D-4097. All non molded surfaces shall be coated with resin incorporating paraffin to facilitate a full cure of the surface. All cut edges, bolt holes, secondary bonds shall be sealed with a resin coat prior to the final paraffinated resin coat. All voids to be filled with a resin paste.
2) Corrosion Liner: The inner surface of all laminates shall be resin rich and reinforced with NEXUS 111-00010, Dacron 106 homopolymer Or Equal with a minimum thickness of 10 mils. The interior corrosion layer shall consist of two layers of 1 1/2 oz. per sq. ft. chopped strand mat. If the application is by chopper gun spray up the glass fiber shall be 1/2 inch to 2- inch in length. The total corrosion liner thickness shall be a minimum of 100 mils and have a resin to glass ratio of 80/20. All edges of reinforcement to be lapped a minimum of one inch.
00010, Dacron 106 homopolymer, Or Equal.
3. Reinforcement: Glass fiber reinforcement used shall be commercial grade corrosion resistance borosilicate glass.
a. All glass fiber reinforcement shall be Type C chemical grade, Type E
electrical grade.
b. Surfacing veil shall be 10 mil Nexus 111-00010, Dacron 106 homopolymer, Or equal.
c. Mat shall be Type "E" (electrical grade) glass, 1 1/2 oz. per sq. ft with a nominal fiber length of 1.25 + 0.25 inches, with a silane finish and styrene soluble binder.
d. Continuous glass roving, used in chopper gun spray-up applications shall be type "E" grade with chrome or silane coupling agent.
e. Woven roving used for reinforcement shall be 24 oz. per sq. yard type "E" glass and have a 5 x 4 plain weave.
4. Miscellaneous:
a. Stainless Steel: Unless otherwise specified, all fasteners, and metal attachments, such as anchors, brackets etc shall be ANSI 316 Stainless Steel. All metals shall be compatible with the chemical in contact. CONTRACTOR shall include in submittal a material list for all metals in contact with chemicals for ENGINEER approval.
b. Gaskets: Unless otherwise specified, all gaskets shall be Teflon or Teflon encapsulated Viton as required for compatibility with the service chemicals. CONTRACTOR shall include in submittal a material list for all gasket in contact with chemicals for ENGINEER approval.
c. Fabrication:
1) General: Fabrication shall be in accordance with NBS PS 15-69 and ASTM D-4097. All non molded surfaces shall be coated with resin incorporating paraffin to facilitate a full cure of the surface. All cut edges, bolt holes, secondary bonds shall be sealed with a resin coat prior to the final paraffinated resin coat. All voids to be filled with a resin paste.
2) Corrosion Liner: The inner surface of all laminates shall be resin rich and reinforced with NEXUS 111-00010, Dacron 106 homopolymer Or Equal with a minimum thickness of 10 mils. The interior corrosion layer shall consist of two layers of 1 1/2 oz. per sq. ft. chopped strand mat. If the application is by chopper gun spray up the glass fiber shall be 1/2 inch to 2- inch in length. The total corrosion liner thickness shall be a minimum of 100 mils and have a resin to glass ratio of 80/20. All edges of reinforcement to be lapped a minimum of one inch.
3) Structural Laminate: Structural laminates shall consist of
alternating layers of 1-1/2 oz per sq. ft mat or chopped glass and
24 oz per sq. yard woven roving applied to reach a designed
thickness. Actual laminate sequences shall be per the laminate
tables shown on fabrication drawings. The exterior surface shall be
relatively smooth and shall have no glass fibers exposed. The
exterior shall be surface coated with white gel coat containing
ultra violet light inhibitors.
D. Accessories: Air inlet, air outlet, pump connections, spray headers, baffles, packing support, drain, level connections, air sampling ports, access for mist eliminator and all connections shown on the Drawings shall be provided by the manufacturer. Tie down lugs shall be integrally molded into the walls of the sump. Anchor bolts shall be 316SS and designed for the specified loads. Flanges for liquid service shall be ANSI Std. B 16.9 and air connections shall be duct flanges per PS 15-69 Table 2. Access flanges for manways, mist eliminator, and packing access flanges shall be air tight to the pressure equal to or higher than the corresponding fan static pressure and shall be water tight. Interior fasteners shall be of corrosion resistance materials such as PVC or titanium.
E. Mist Eliminator: A high efficiency, chevron type mist eliminator shall be provided in stage 1. The mist eliminator shall remove 99 percent of all mist particles 40 microns and larger and 90 percent of all mist particles 10 microns and larger. A multilayered high efficiency mesh-pad mist eliminator shall be provided at stage-3 of the system. The mist eliminator for stage-3 shall remove 99% of all mist particles 5 microns and larger.
F. Mist Eliminator W ash System: A liquid distributor with nozzles shall be provided to manually spray dilute hydrochloric acid for mist eliminator and packing washing.
G. Mist Eliminator Access: Mist eliminator shall be provided with easy access for removal and replacement. The opening shall be flanged with bolted cover.
H. Scrubbers Construction: Except for the fan, inlet transition and the stack, the scrubbers shall be designed, fabricated, factory assembled and shipped to the job site as one piece. The control panel shall ship loose and be located so that it meets all codes for clearances and is easily accessible. Final location of the panel mounted to the equipment will be determined through the shop drawing phase. The control panel shall be mounted at least 3 feet from the Scrubber system and any odor control ductwork.
I. Piping: All chemical recycle, make-up water, drain and blowdown piping shall be SCH 80 CPVC. The CONTRACTOR shall insulate and heat trace all external piping as required by climate conditions.
J. Neoprene Pad: A 1/4 inch thick, 60 durometer neoprene rubber sheet must be placed underneath the scrubber vessel.
K. Access Manways: The scrubber shall have adequate number of access manways on top, side and in the sumps. Top access manways shall not be less than 36-inch diameter. Side access manway in the packing area shall not be less than 24-inch diameter. Sump access side manways shall not be less than 19-inch diameter.
D. Accessories: Air inlet, air outlet, pump connections, spray headers, baffles, packing support, drain, level connections, air sampling ports, access for mist eliminator and all connections shown on the Drawings shall be provided by the manufacturer. Tie down lugs shall be integrally molded into the walls of the sump. Anchor bolts shall be 316SS and designed for the specified loads. Flanges for liquid service shall be ANSI Std. B 16.9 and air connections shall be duct flanges per PS 15-69 Table 2. Access flanges for manways, mist eliminator, and packing access flanges shall be air tight to the pressure equal to or higher than the corresponding fan static pressure and shall be water tight. Interior fasteners shall be of corrosion resistance materials such as PVC or titanium.
E. Mist Eliminator: A high efficiency, chevron type mist eliminator shall be provided in stage 1. The mist eliminator shall remove 99 percent of all mist particles 40 microns and larger and 90 percent of all mist particles 10 microns and larger. A multilayered high efficiency mesh-pad mist eliminator shall be provided at stage-3 of the system. The mist eliminator for stage-3 shall remove 99% of all mist particles 5 microns and larger.
F. Mist Eliminator W ash System: A liquid distributor with nozzles shall be provided to manually spray dilute hydrochloric acid for mist eliminator and packing washing.
G. Mist Eliminator Access: Mist eliminator shall be provided with easy access for removal and replacement. The opening shall be flanged with bolted cover.
H. Scrubbers Construction: Except for the fan, inlet transition and the stack, the scrubbers shall be designed, fabricated, factory assembled and shipped to the job site as one piece. The control panel shall ship loose and be located so that it meets all codes for clearances and is easily accessible. Final location of the panel mounted to the equipment will be determined through the shop drawing phase. The control panel shall be mounted at least 3 feet from the Scrubber system and any odor control ductwork.
I. Piping: All chemical recycle, make-up water, drain and blowdown piping shall be SCH 80 CPVC. The CONTRACTOR shall insulate and heat trace all external piping as required by climate conditions.
J. Neoprene Pad: A 1/4 inch thick, 60 durometer neoprene rubber sheet must be placed underneath the scrubber vessel.
K. Access Manways: The scrubber shall have adequate number of access manways on top, side and in the sumps. Top access manways shall not be less than 36-inch diameter. Side access manway in the packing area shall not be less than 24-inch diameter. Sump access side manways shall not be less than 19-inch diameter.
2.5 RECIRCULATION PUMPS
A. Each sump shall have a recirculation pump. The recirculation pump shall be a seal- less, rugged, vertical, centrifugal type pump of virgin unfilled plastic construction for corrosion resistance and long service life. No seal water shall be required. Pump design shall feature an impeller in the submerged casing, cantilevered shaft, no bearings immersed in the process fluid and dry running capability. No exception to these requirements will be allowed.
B. The pump shall be driven by a “C” face motor, mounted on an CPVC or FRP bracket, sitting on pump mounting plate and connected to the pump shaft via a durable, flexible coupling to isolate the motor from hydraulic thrust force. An epoxy-coated cast iron motor bracket may be substituted if approved by the Engineer.
C. The casing and impeller shall be molded from premium grade unfilled virgin plastic. Casing and impeller shall be CPVC or PVDF. There should be no metal wetted components. Wetted bolts shall be made of 316 stainless steel with acid resistant epoxy coating. Casing and impeller shall be made of CPVC or PVDF.
D. Pump shafts shall be machined from centerless ground 304 SS, encapsulated with plastic sleeving that is the same material as the pump casing material.
E. The thrust bearing shall be independent from the motor, located in brackets above the mounting plate. No bearings shall be immersed in the process solution. A non- metallic vapor seal to protect the metal motor bracket from corrosive fumes shall be provided. No external flush water shall be required. Pumps that use scrubber sump liquid to flush seals shall not be acceptable.
F. The unit shall be built with casing cover and impeller assembly modified for thermal fluctuation enabling the pump to be used through the full range of temperature settings.
G. Each pump shall be furnished with an all plastic fabricated strainer basket with 1/4 inch diameter perforations in same to keep any large particles out of the casing or impeller area.
H. Motors shall be “C” face, 460 V, 3 PH, 60 Hz, TENV. Motors larger than 15 HP shall require reduced voltage starters. Motors shall be manufactured by Baldor, Reliance or approved equal. Motors shall be per Section 16220, Electric Motors.
I. The recirculation pumps manufacturer and model, Or Equal:
1. Vanton Sump-Gard SGK.
2. Sethco by Met-Pro
J. The pumps shall be sized by the manufacturer for proper flow rate and pressure as required for the installation. Pumps capacities shall be as follows:
A. Each sump shall have a recirculation pump. The recirculation pump shall be a seal- less, rugged, vertical, centrifugal type pump of virgin unfilled plastic construction for corrosion resistance and long service life. No seal water shall be required. Pump design shall feature an impeller in the submerged casing, cantilevered shaft, no bearings immersed in the process fluid and dry running capability. No exception to these requirements will be allowed.
B. The pump shall be driven by a “C” face motor, mounted on an CPVC or FRP bracket, sitting on pump mounting plate and connected to the pump shaft via a durable, flexible coupling to isolate the motor from hydraulic thrust force. An epoxy-coated cast iron motor bracket may be substituted if approved by the Engineer.
C. The casing and impeller shall be molded from premium grade unfilled virgin plastic. Casing and impeller shall be CPVC or PVDF. There should be no metal wetted components. Wetted bolts shall be made of 316 stainless steel with acid resistant epoxy coating. Casing and impeller shall be made of CPVC or PVDF.
D. Pump shafts shall be machined from centerless ground 304 SS, encapsulated with plastic sleeving that is the same material as the pump casing material.
E. The thrust bearing shall be independent from the motor, located in brackets above the mounting plate. No bearings shall be immersed in the process solution. A non- metallic vapor seal to protect the metal motor bracket from corrosive fumes shall be provided. No external flush water shall be required. Pumps that use scrubber sump liquid to flush seals shall not be acceptable.
F. The unit shall be built with casing cover and impeller assembly modified for thermal fluctuation enabling the pump to be used through the full range of temperature settings.
G. Each pump shall be furnished with an all plastic fabricated strainer basket with 1/4 inch diameter perforations in same to keep any large particles out of the casing or impeller area.
H. Motors shall be “C” face, 460 V, 3 PH, 60 Hz, TENV. Motors larger than 15 HP shall require reduced voltage starters. Motors shall be manufactured by Baldor, Reliance or approved equal. Motors shall be per Section 16220, Electric Motors.
I. The recirculation pumps manufacturer and model, Or Equal:
1. Vanton Sump-Gard SGK.
2. Sethco by Met-Pro
J. The pumps shall be sized by the manufacturer for proper flow rate and pressure as required for the installation. Pumps capacities shall be as follows:
|
|
Stage 1 |
Stage 2 |
Stage 3 |
||||||
|
Scrubber I.D. |
Pump Tag |
GPM |
HP |
Pump Tag |
GPM |
HP |
Pump Tag |
GPM |
HP |
|
15KSBR110 |
15KPMP112 |
400 |
15 |
15KPMP142 |
400 |
15 |
15KPMP172 |
400 |
15 |
|
15KSBR140 |
15KPMP115 |
400 |
15 |
15KPMP145 |
400 |
15 |
15KPMP175 |
400 |
15 |
|
15KSBR170 |
15KPMP119 |
400 |
15 |
15KPMP149 |
400 |
15 |
15KPMP179 |
400 |
15 |
2.6 EXHAUST FANS
A. A total of three exhaust fans shall be provided. One fan shall be provided for each odor control train. Fan shall have fiberglass reinforced plastic centrifugal backward inclined impeller. The wheel shall be dynamically balanced. Resin shall be suitable for exposure to the specific service conditions.
B. The FAN shaft shall be 316 stainless steel. The shaft seal shall be Teflon or Viton.
1. Provide shaft cooler or Manufacturer certificate indicating such cooler is not required.
2. OSHA approved belt guard and shaft guard shall be provided.
C. Bearings shall be heavy duty, self aligning grease lubricated pillow-block type with minimum of 150,000 hours average life (AFBMA L50).
1. Bearing shall be located outside of airstream.
D. Motor shall be high-efficiency, TEFC, 1800 RPM with a 1.15 service factor and suitable for 3/60/230-460V. Motors shall be per Section 16220, Electric Motors.
E. Fan shall have a constant V-belt drive sized with a 1.5 service factor.
F. Fan housing shall be constructed of fiberglass and reinforced with rigid bracing to increase structural integrity. Bearing support brackets shall be positioned to directly oppose belt tension forces. Fan housing shall be a curved scroll design with a 1-inch drain connection at the bottom of the fan scroll. The fan inlet shall be slip type and the fan outlet shall have a flanged nozzle.
G. The fan pedestal base shall be fabricated from carbon steel then hot dipped galvanized.
H. The fan shall be designed for the following specifications:
I. Flexible Connectors:
1. Provide flanged expansion joint for inlet of fan and for outlet of fan to FRP vessel inlet transition piece. The flange drilling shall be coordinated with fan and transition.
2. Type: W-design configuration with integral flanges suitable for service with FRP
duct.
A. A total of three exhaust fans shall be provided. One fan shall be provided for each odor control train. Fan shall have fiberglass reinforced plastic centrifugal backward inclined impeller. The wheel shall be dynamically balanced. Resin shall be suitable for exposure to the specific service conditions.
B. The FAN shaft shall be 316 stainless steel. The shaft seal shall be Teflon or Viton.
1. Provide shaft cooler or Manufacturer certificate indicating such cooler is not required.
2. OSHA approved belt guard and shaft guard shall be provided.
C. Bearings shall be heavy duty, self aligning grease lubricated pillow-block type with minimum of 150,000 hours average life (AFBMA L50).
1. Bearing shall be located outside of airstream.
D. Motor shall be high-efficiency, TEFC, 1800 RPM with a 1.15 service factor and suitable for 3/60/230-460V. Motors shall be per Section 16220, Electric Motors.
E. Fan shall have a constant V-belt drive sized with a 1.5 service factor.
F. Fan housing shall be constructed of fiberglass and reinforced with rigid bracing to increase structural integrity. Bearing support brackets shall be positioned to directly oppose belt tension forces. Fan housing shall be a curved scroll design with a 1-inch drain connection at the bottom of the fan scroll. The fan inlet shall be slip type and the fan outlet shall have a flanged nozzle.
G. The fan pedestal base shall be fabricated from carbon steel then hot dipped galvanized.
H. The fan shall be designed for the following specifications:
|
Scrubber System I.D. |
15KSBR110 |
15KSBR140 |
15KSBR170 |
|
Fan Tag I.D. |
15KFAN111 |
15KFAN141 |
15KFAN171 |
|
Air Flow Rate, cfm |
20,000 |
20,000 |
20,000 |
|
Maximum Pressure Drop, in. WC |
19.0 |
19.0 |
19.0 |
|
Maximum Motor HP |
100.0 |
100.0 |
100.0 |
I. Flexible Connectors:
1. Provide flanged expansion joint for inlet of fan and for outlet of fan to FRP vessel inlet transition piece. The flange drilling shall be coordinated with fan and transition.
2. Type: W-design configuration with integral flanges suitable for service with FRP
duct.
3. The Properties of the Flexible Connectors Shall be as Follows:
Material shall be EPDM. Material shall be resistant to ultraviolet
light degradation and shall be suitable for contact with odorous air
as specified herein. The backing rings shall be 1/4-inch thick, 2
inches wide, type 316 stainless steel. The length from
flange-to-flange shall be 6 inches unless shown otherwise. The
extension shall be 1 inch, compression shall be 2 inches, lateral
offset shall be 2.5 inches and the thickness shall be ¼-inch
minimum.
a. Manufacturer shall be, Or Equal.
1) Senior Flexonics.
2) U.S. Belows, Inc. J. Provide FRP fan inlet boxes.
K. The fan shall be shipped loose from the scrubber system and be anchored to a concrete pad without vibration isolators.
L. The motor shall be manufactured by Baldor, Reliance Or Equal.
M. Fan shall be New York Blower, Duall, Hartzell, Or Equal. The fan shall have an
AMCA seal.
2.7 CHEMICAL FEED SYSTEM
A. The chemical feed and dilution system takes sulfuric acid, sodium hydroxide and sodium hypochlorite and dilutes the chemical, and delivers it to the spray nozzle where the chemical solution is circulated through the packing media. The chemical feed and dilution system shall contain all piping and equipment necessary to deliver chemicals from storage tanks to the scrubber sumps.
B. Chemical Metering Pumps:
1. General: Positive displacement, hydraulically actuated diaphragm type chemical metering pumps shall be provided to deliver 98 percent sulfuric acid, 25 percent sodium hydroxide and 12.5 percent sodium hypochlorite solution to the scrubbers. All chemical metering pumps shall be suitable for 24-hour per day operation. All pumps shall have a minimum discharge pressure of 100 psig.
2. The metering pumps shall have a capacity that is at least 150 percent of the capacity required by the system at the maximum inlet air loadings. Feed rate shall be adjustable from 10 percent to 100 percent of the range.
3. The CONTRACTOR shall plumb between chemical storage tanks to the metering pump skid, and from the metering pump skid to the scrubbers. The Manufacturer will provide an injection valve for placement in each chemical feed line at the scrubber.
4. Pumps shall be provided with automatic stroke frequency adjuster that responds to
4-20 mA signal.
5. Operating Conditions: Each pump shall have a maximum capacity as follows at a maximum back pressure of 150 pounds per inch:
a. Manufacturer shall be, Or Equal.
1) Senior Flexonics.
2) U.S. Belows, Inc. J. Provide FRP fan inlet boxes.
K. The fan shall be shipped loose from the scrubber system and be anchored to a concrete pad without vibration isolators.
L. The motor shall be manufactured by Baldor, Reliance Or Equal.
M. Fan shall be New York Blower, Duall, Hartzell, Or Equal. The fan shall have an
AMCA seal.
2.7 CHEMICAL FEED SYSTEM
A. The chemical feed and dilution system takes sulfuric acid, sodium hydroxide and sodium hypochlorite and dilutes the chemical, and delivers it to the spray nozzle where the chemical solution is circulated through the packing media. The chemical feed and dilution system shall contain all piping and equipment necessary to deliver chemicals from storage tanks to the scrubber sumps.
B. Chemical Metering Pumps:
1. General: Positive displacement, hydraulically actuated diaphragm type chemical metering pumps shall be provided to deliver 98 percent sulfuric acid, 25 percent sodium hydroxide and 12.5 percent sodium hypochlorite solution to the scrubbers. All chemical metering pumps shall be suitable for 24-hour per day operation. All pumps shall have a minimum discharge pressure of 100 psig.
2. The metering pumps shall have a capacity that is at least 150 percent of the capacity required by the system at the maximum inlet air loadings. Feed rate shall be adjustable from 10 percent to 100 percent of the range.
3. The CONTRACTOR shall plumb between chemical storage tanks to the metering pump skid, and from the metering pump skid to the scrubbers. The Manufacturer will provide an injection valve for placement in each chemical feed line at the scrubber.
4. Pumps shall be provided with automatic stroke frequency adjuster that responds to
4-20 mA signal.
5. Operating Conditions: Each pump shall have a maximum capacity as follows at a maximum back pressure of 150 pounds per inch:
|
System I.D. |
Scrubber 1 15KSBR110 |
Scrubber 2 15KSBR110 |
Scrubber 3 15KSBR110 |
|
Stage 1 |
|
|
|
|
H2SO4 Feed Pump Tag |
15KPMP310 |
15KPMP320 |
15KPMP330 |
|
H2SO4 Pump Capacity, gph |
12 |
12 |
12 |
|
Stage 2 |
|
|
|
|
NaOH Feed Pump Tag |
15KPMP250 |
15KPMP270 |
15KPMP290 |
|
NaOH Pump Capacity, gph |
5 |
5 |
5 |
|
NaOCl Feed Pump Tag |
15GPMP281 |
15GPMP287 |
15GPMP293 |
|
NaOCl Pump Capacity, gph |
12 |
12 |
12 |
|
Stage 3 |
|
|
|
|
NaOH Feed Pump Tag |
15KPMP260 |
15KPMP280 |
15KPMP300 |
|
NaOH Pump Capacity, gph |
5 |
5 |
5 |
|
NaOCl Feed Pump Tag |
15GPMP284 |
15GPMP290 |
15GPMP296 |
|
NaOCl Pump Capacity, gph |
12 |
12 |
12 |
C. Metering Pumps Requirements: Refer to Section 11079, Pumping Equipment: Diaphragm Metering Pumps.
2.8 ACCESSORIES
A. Make-up Water Control: The direct reading rotameter shall be a variable area type with a Teflon float, Teflon encapsulated "O" rings, and CPVC fittings. The rotameter shall be of the same size as the pipe in which it is installed. The rotameter shall have a direct reading scale.
B. Scrubber Recirculation Sump Blowdown and Level Controls: The scrubber shall be operated with a manual blowdown. The rate of blowdown shall be proportional to the rate of make-up water. A low level float switch shall be provided for each sump. The float switch shall be per Section 17405.
C. Differential Pressure Gauges and Transmitters: Four magnehelic type pressure gauges and transmitters shall be provided to monitor pressure drop across the scrubber packing media and the mist eliminators. Pressure transmitters shall be installed at an elevation that is easily viewed and maintained. Transparent overlays will be included. The gauges shall be per Section 17034, Gauges, and the pressure transmitters shall be per Section 17405, Process Instrumentation and Control.
D. Pressure Gauges: A liquid-filled stainless steel pressure gauge, including an all CPVC plastic gauge isolator/guard and an isolation valve, shall be provided for installation in the recirculation pump discharge piping. The gauge shall have a minimum dial size of 3-1/2 inches. The gauge face shall indicate units of measurement and the normal operating reading shall be near the midpoint of the range.
E. Recirculation Pump Flow: A magnetic flow meter shall be installed on the discharge pipe of each recirculation pump. The flow meter size shall be the same as the discharge pipe. The flow meter shall use wetted material compatible with the recirculation fluid. Acceptable wetted materials include Teflon, PVDF or TEFZEL. Flow meter connection shall be flanged.
G. NaOCl Analysis Kits: The scrubber system shall be provided with three Hach, LaMotte, Or Equal NaOCl test kits for the range of 0 percent to 1 percent to analyze scrubber sump and one Hach, LaMotte, Or Equal NaOCl test kit for the range 1 to 15 percent to analyze NaOCl storage.
H. Muriatic Acid Connection: The third stage of the scrubber shall be provided with connection to add muriatic acid to the sump. The connection shall be flanged with 2-inch CPVC piping, CPVC or PVDF ball valve with Teflon seats and O-rings and PVDF quick- disconnect coupling with cap.
I. Gas Flow Meter: An ultrasonic gas flow meter shall be installed on each inlet duct to the exhaust fans, see Section 17405, Process Instrumentation and Control for additional requirements. Working parameters:
1. Tag Numbers: 15KFE108, 15KFE138, and 15KFE168
2. Gas Flow Range: 0 to 20,000 cfm
3. Flow Velocity Range: 0 to 50 ft/sec.
4. Gas Type: Foul air.
5. Temperature Range: 20 to 130 degree F.
6. Pressure Range: 0 to 10 pounds per inch.
7. Pipe Diameter: 36 inches
8. Pipe Material: FRP
9. Wetted Parts Material: Hastelloy C.
10. Required Flow Accuracy: Plus or minus 2 percent.
2.9 FIBERGLASS EXHAUST STACK
A. Dimensions: Stack height shall be at least 2.5 times the internal diameter of stack and as required per SCAQMD regulations.
B. Design stack to withstand 120 mph winds and seismic zone No. 4 forces. C. Provide stack of free-standing design without guy wires.
D. Provide a minimum of two 4-inch air sampling ports for each stack piped down to personnel accessible height without use of ladders. Provide 4-inch ball valve with Teflon seats and “O” rings at the end of the sampling pipe. Pipe and valve shall be SCH 80
CPVC. Sampling ports shall be placed at 90 Deg. angle from each other.
E. Provide lightning protection system in accordance with NFPA regulations.
F. Provide grounding in accordance with NFPA 780.
1. Connect down leads to grounding system as installed under electrical
Specifications.
G. Stacks on top of the carbon adsorbers shall be fully supported by the vessel with all necessarysupports, bracing and seismic restrains. Manufacturer of carbon vessel shall take full responsibility for the design of stack and its support.
H. Weight of stacks on top of the wet scrubbers shall be fully supported by the scrubber. Themanufacturer of the vessel shall take full responsibility for the design of the stacks and its support andseismic bracing. This responsibility shall include all transitional FRP ducting and incorporate any foulair flow dampers. Stacks dampers shall be provided by the Contractor and installed by the scrubbervendor. Electrical supply, electrical connections, and signals to dampers shall be the responsibility of the CONTRACTOR.
2.10 ACTIVATED CARBON ADSORBER SYSTEM A. Scope:
1. Furnish all labor, materials, equipment and incidentals required to provide and install a carbonadsorption system complete with controls and accessories for the control of H2S, odorous VOCs,and other noxious odors as specified herein.
2. The CONTRACTOR shall install the system in accordance with the
Manufacturer's instructions. B. System Description:
1. The system will include but not be limited to adsorber vessels, activated carbon, interconnecting piping, stacks, valves, and accessories.
2. All equipment, ductwork, and appurtenances shall be new.
3. The system shall be designed for continuous use.
4. All components of the system shall be designed for outdoor service.
All materials of construction as well as miscellaneous hardware shall be resistant to attack by thecompounds being adsorbed.
C. Qualification:
1. All equipment specified under this section shall be furnished by a single manufacturer withsingle-source responsibility per Section 11210, Pumps, General. The Manufacturer shall bequalified and experienced in the design, construction, and operation of adsorption systems, andshall regularly produce such systems.
2. The supplier of the system shall have at least 5 years experience with adsorption systems witha minimum of 5 installations in operation.
3. Equipment shall be designed for operation at temperatures up to 130 degrees F, with a 120 mph wind load, and in seismic zone 4. A load safety factor of three (3) should be applied to the design.
1. Connect down leads to grounding system as installed under electrical
Specifications.
G. Stacks on top of the carbon adsorbers shall be fully supported by the vessel with all necessarysupports, bracing and seismic restrains. Manufacturer of carbon vessel shall take full responsibility for the design of stack and its support.
H. Weight of stacks on top of the wet scrubbers shall be fully supported by the scrubber. Themanufacturer of the vessel shall take full responsibility for the design of the stacks and its support andseismic bracing. This responsibility shall include all transitional FRP ducting and incorporate any foulair flow dampers. Stacks dampers shall be provided by the Contractor and installed by the scrubbervendor. Electrical supply, electrical connections, and signals to dampers shall be the responsibility of the CONTRACTOR.
2.10 ACTIVATED CARBON ADSORBER SYSTEM A. Scope:
1. Furnish all labor, materials, equipment and incidentals required to provide and install a carbonadsorption system complete with controls and accessories for the control of H2S, odorous VOCs,and other noxious odors as specified herein.
2. The CONTRACTOR shall install the system in accordance with the
Manufacturer's instructions. B. System Description:
1. The system will include but not be limited to adsorber vessels, activated carbon, interconnecting piping, stacks, valves, and accessories.
2. All equipment, ductwork, and appurtenances shall be new.
3. The system shall be designed for continuous use.
4. All components of the system shall be designed for outdoor service.
All materials of construction as well as miscellaneous hardware shall be resistant to attack by thecompounds being adsorbed.
C. Qualification:
1. All equipment specified under this section shall be furnished by a single manufacturer withsingle-source responsibility per Section 11210, Pumps, General. The Manufacturer shall bequalified and experienced in the design, construction, and operation of adsorption systems, andshall regularly produce such systems.
2. The supplier of the system shall have at least 5 years experience with adsorption systems witha minimum of 5 installations in operation.
3. Equipment shall be designed for operation at temperatures up to 130 degrees F, with a 120 mph wind load, and in seismic zone 4. A load safety factor of three (3) should be applied to the design.
4. Equipment shall comply with the latest editions of the following codes and standards:
a. California Building Code (CBC)
b. National Electrical Code (NEC)
c. International Electrotechnical Commission (lEC)
d. National Electrical Manufacturers Association (NEMA)
e. ASTM International (ASTM)
D. Acceptable Manufacturers: Subject to compliance with the Contract Documents, the followingmanufacturers are acceptable:
1. Met-Pro Corporation/Duall Division.
2. Siemens Water Technologies, San Diego, California.
3. Or Equal.
E. Design Criteria: The carbon adsorption system shall consist of two carbon adsorber vessels of the“dual-bed” design configuration and conforming to the following design criteria:
F. Materials of Construction:
1. The vessel shall be fabricated from premium grade vinyl ester resin FRP
construction through all layers (corrosion and structural).
2. Resin used in fabrication shall be a premium vinyl ester resin such as Hetron 922 by AshlandChemical, Derakane 411 by Dow Chemical, Or Equal. The resin shall be reinforced with an innerveil of a suitable synthetic organic fiber such as Nexus
00010, Dacron 106 homopolymer Or Equal.
3. Reinforcement: Glass fiber reinforcement used shall be commercial grade corrosion resistantborosilicate glass.
4. Fabrication:a. California Building Code (CBC)
b. National Electrical Code (NEC)
c. International Electrotechnical Commission (lEC)
d. National Electrical Manufacturers Association (NEMA)
e. ASTM International (ASTM)
D. Acceptable Manufacturers: Subject to compliance with the Contract Documents, the followingmanufacturers are acceptable:
1. Met-Pro Corporation/Duall Division.
2. Siemens Water Technologies, San Diego, California.
3. Or Equal.
E. Design Criteria: The carbon adsorption system shall consist of two carbon adsorber vessels of the“dual-bed” design configuration and conforming to the following design criteria:
-
System I.D.
15KTNK130
15KTNK190
Maximum Superficial Velocity, fps
1.4
1.4
Internal Positive Pressure, in. WC
+15
+15
Maximum Operating Temperature, °F
150
150
Number of Carbon Bed(s)
Two (2)
Two (2)
Carbon Bed Height, ft (each)
3.0
3.0
F. Materials of Construction:
1. The vessel shall be fabricated from premium grade vinyl ester resin FRP
construction through all layers (corrosion and structural).
2. Resin used in fabrication shall be a premium vinyl ester resin such as Hetron 922 by AshlandChemical, Derakane 411 by Dow Chemical, Or Equal. The resin shall be reinforced with an innerveil of a suitable synthetic organic fiber such as Nexus
00010, Dacron 106 homopolymer Or Equal.
3. Reinforcement: Glass fiber reinforcement used shall be commercial grade corrosion resistantborosilicate glass.
a. General: Fabrication shall be in accordance with NBS PS 15-69, ASTM D-
3299 and ASTM D-4097. All non-molded surfaces shall be coated with resin incorporating paraffin to facilitate a full cure of the surface. All cut edges, bolt holes, secondary bonds shallbe sealed with a resin coat prior to the final paraffinated resin coat.
b. Corrosion Liner: The inner surface of all laminates shall be resin rich and reinforced with one NEXUS 111-00010, Dacron 106 homopolymer Or Equal with a minimum thickness of 10 mils.The interior corrosion layer shall consist of two layers of 1 1/2 oz. per sq. ft. chopped strandmat. The total corrosion liner thickness shall be a minimum of 100 mils.
c. Structural Laminate: Structural laminates shall consist of alternating layers of
1-1/2 oz per sq. ft mat or chopped glass and 24 oz per sq. yard woven roving applied to reacha designed thickness. The exterior shall be surface coated with white gel coat containing ultraviolet light inhibitors.
5. Fittings: The vessel shall be fitted with the following fittings: Top Manways, Two Side Manways,Drains with Valves, Carbon Sample Ports, Differential Pressure Gauges, Grounding Rods, AnchorLugs and Lifting Lugs.
G. Carbon Adsorber Vessel Accessories:
1. Differential Pressure Gauge and Transmitter: A differential pressure gauge shall be provided to continuously monitor the pressure drop across each carbon bed. The differential pressure gauge shall be isolated with isolation valves and shall be mounted on the vessel.
2. Carbon Sample Probes: Each carbon bed shall have three (3) 1 inch diameter sample probes per bed which shall extend into the bed a minimum of 12 inches. The sample probes shall be blocked off with a ball valve constructed of PVC.
3. Grounding Rod: A stainless steel rod shall be provided to adequately ground each carbon bed. Rods shall be grounded via a 10 gauge wire.
4. Carbon Support Grating and Screen: Each adsorber vessel shall be furnished to accommodate two beds of activated carbon having an average depth of three feet. The carbon bed shall be supported on a polypropylene screen through an FRP support grating system. The screen and the support system shall be removable through the top cover. The support system shall consist of removable grating. Pall rings or other dumped packing media as a means of carbon support will not be acceptable. The support system shall be designed to withstand a load of at least 150 lbs/ft2 with a minimum deflection of 1/4 inch under all conditions.
5. Access Manways: The vessel shall have 36-inch diameter top access manway and side access manway.
6. Exhaust Stack: The adsorber shall be provided with a straight outlet with no caps. The exhaust shall be designed to prevent rain water from reaching the carbon beds. For stack design requirements refer to Section 2.9.
7. Anchor Bolts: The Carbon Adsorber shall be provided with properly sized epoxy anchor system.
8. Equipment Tags: The vessel shall be provided with an I.D. Tag with the following minimum information: Carbon Type, Vessel Dimensions, Date of Manufacture, and Design Conditions.
H. Gas Flow Meter: An ultrasonic gas flow meter shall be installed on the inlet duct to each activated carbon adsorber, see Section 17405, Process Instrumentation and Control for additional requirements. Working parameters:
1. Tag Numbers: 15KFE137 and 15KFE197
2. Gas Flow Range: 0 to 20,000 cfm
3. Flow Velocity Range: 0 to 50 ft/sec.
4. Gas Type: Foul air.
5. Temperature Range: 20 to 130 degrees F.
6. Pressure Range: 0 to 5 pounds per inch.
7. Pipe Diameter: 36 inches.
8. Pipe Material: FRP.
9. Wetted Parts Material: Hastelloy C.
10. Required Flow Accuracy: Plus or minus 2 percent.
I. Activated Carbon Media: The media shall be virgin vapor-phase pelletized activated carbon manufactured from a high grade metallurgical coal (anthracite) coconut shells or bituminous coal.
1. The media shall posses both a high surface area and a large internal pore volume.
2. The media shall have a high adsorption capacity for odorous compounds and volatile organic compounds (VOCs); and shall have high retention for retaining and preventing the desorption of previously adsorbed organic compounds.
3. The media shall have the following properties:
Item
Description/Value
Carbon Type
Vapor-phase
Type
Pelletized
Pellet Diameter, mm (min)
4.0 – 4.25
Surface Area (B.E.T. – m2/g) (min)
1,000
Hardness Number, wt percent (min.) Per ASTM D-2862
95
Butane Number, wt percent (min.)
23.5
Item
Description/Value
Moisture Content, wt. percent (max.) Per ASTM D-2867
3
Ash Content, wt percent (max)
8
CTC Activity, wt percent (typical)
60
CTC Retentivity, wt percent
25 – 30
Apparent bulk density, g/cc
0.41 – 0.53
2.11 SOURCE QUALITY CONTROL A. Fiberglass Vessels:
1. Hydrostatically test prior to shipment, with water to the straight-side height of the vessel for a minimum of 24 hours.
2. The water must be held with no visible signs of leaks or excessive wall deflection.
3. ENGINEER reserves the right to be present at the fabricator's facility during testing.
4. Notify ENGINEER two (2) weeks prior to the performance of the test.
5. Minimum two (2) burn tests of cutouts from areas where access doors, or piping cutouts are required to verify glass resin ratio
B. Activated Carbon:
1. For each 10,000-pound maximum carbon lot, submit test report from independent testing laboratory for the verifying hydrogen sulfide breakthrough capacity, moisture content, maximum head loss through the activated carbon, minimum total ash content, iodine number, and carbon tetrachloride activity.
2. The determination of H2S breakthrough capacity will be made by passing a moist (85 percent R.H.) air stream containing 1 percent H2S at a rate of 1,450 cc/min through a 19 millimeter DIA by 9 inches deep bed of uniformly packed activated carbon and monitored to 50 ppm breakthrough.
a. Results are expressed in grams H2S removed per cc of carbon.
2.12 INSTRUMENTATION AND SYSTEM CONTROLS
A. Local control panels shall be provided for each scrubber to house the pH and ORP analyzers and a separate panel to house the damper controls as shown on the P&IDs. The exhaust fans and recirculation pumps shall be provided with local controls at the MCC as shown on the P&IDs. The metering pumps shall be provided with a local control panel as shown on the P&IDs.
B. Local control panel enclosures shall be of 316 stainless steel construction and rated NEMA 4X. The panels shall be mounted remotely from the scrubber assembly and factory tested to full operation with all other components prior to shipment. NFPA 820
Option: One local panel shall be provided for each metering pump and shall include the components shown on the P&IDs.
C. pH and ORP analyzers shall be as specified in Section 17160, Analyzers.
2.13 SPECIAL TOOLS AND SPARE PARTS
A. All special tools required for normal operation and maintenance of the equipment shall be furnished with the equipment by the Manufacturer. The operation and maintenance manual shall identify each such tool and where it is used.
B. The following spare parts for approximately two years of operation shall be provided:
1. One complete set of fan belts for each fan
2. Provide one complete set of fan bearings for each fan.
3. Provide three replacement pH probs.
4. Provide two replacement ORP probs.
C. Spare parts shall be packed in containers which are suitable for storage and which are clearly labeled with indelible markings that indicate the part number and the name of the part contained therein.
PART 3 - EXECUTION
3.1 SHIPPING, STORAGE AND HANDLING
A. All parts shall be properly protected so that no damage or deterioration will occur in transit or during prolonged storage at the site. All equipment shall be shrink-wrapped with proper ventilation ports prior to shipment.
B. All openings in equipment shall be protected against entry of foreign objects.
C. Each box, crate or package shall be properly marked to show its contents and net weight.
3.2 IDENTIFICATION
A. The odor control scrubber system and the chemical storage tanks shall be identified with the health, flammability and reactivity of hazardous materials as required by codes.
3.3 INSTALLATION
A. Install odor control system.
B. Coordinate scrubber vessel anchoring method with other trades and vessel manufacturer.
C. Piping and Equipment - General:
1. Utilize template for location of unit anchorage.
2. Align, level, wedge and plumb units to match piping interfaces as shown on
Contract Drawings.
3. Exercise care in bolting flanged joints so that there is no restraint in the opposite end of pipe or fitting which would prevent uniform gasket pressure at connection or would cause unnecessary stresses to be transmitted to equipment flanges.
4. Tighten flange bolts at uniform rate which will result in uniform gasket compression over entire area of joint.
a. Provide tightening torque in accordance with manufacturer's recommendations.
5. Support and match flange faces to uniform contact over their entire face area prior to installation of any bolt between the piping flange and equipment connecting flange.
6. Permit piping connecting to equipment to freely move in directions parallel to longitudinal centerline when and while bolts in connection flange are tightened.
7. Grout equipment into place prior to final bolting of piping but not before initial fitting and alignment.
a. To provide maximum flexibility and ease of alignment, assemble connecting piping with gaskets in place and minimum of four (4) bolts per joint installed and tightened.
b. Test alignment by loosening flange bolts to see if there is any change in relationship of piping flange with equipment connecting flange.
c. Realign as necessary, install flange bolts and make equipment connection.
8. Utilize anchor bolts and nuts (two (2) nuts per bolt) to secure equipment.
D. Install control panels so visual observation and necessary adjustments can be made from floor level.
3.4 MAINTENANCE OF INSTALLED EQUIPMENT, GATES AND VALVES
A. Maintain the operability and functionality of all installed equipment, gates and valves between the time of installation and the commissioning period. See Specification section
01660, Shipping, Storage and Handling Requirements.
3.5 MANUFACTURER’S FIELD SERVICES
A. Furnish the services of authorized technical representatives of the Manufacturer to assist/inspect the installed equipment and to certify that the equipment has been properly installed and is ready to operate, train OCSD personnel, conduct pre-operational mechanical checkout of the equipment, place equipment into operation, optimize the performances of the equipment and perform the field performance testing.
B. At a minimum, conduct three separate site visits as follows:
1. Inspection of equipment installation (16 hours minimum)
2. Training of OCSD personnel. See Specification section 01820 for requirements.
3. Commissioning. See Specification section 01810 for requirements. Number of hours shall be as required to meet all testing and commissioning requirements, but shall not be less than 40 hours.
3.6 FIELD QUALITY CONTROL A. Fiberglass Vessels Test:
1. Hydrostatically test all vessels with water to the straight-side height of the vessel after field installation is complete.
2. Hold water for a minimum of 24 hours with no visible signs of leaks or excessive wall deflection.
3.7 TESTING REQUIREMENTS AND START-UP
A. Test Procedures: The time of the tests and detailed test procedure shall be submitted for approval prior to the testing period. In the event ammonia or hydrogen sulfide levels are below anticipated levels, the CONTRACTOR shall augment the levels in the influent airstream so that the concentrations are WITHIN -2 to +10 ppm of the design level.
1. The CONTRACTOR shall submit written testing plan detailing all procedures, sampling locations, analytical procedures, laboratory services to be used, laboratory certification by the appropriate State Authority, sampling apparatus, sample transportation procedures, chain of custody forms and qualification of personnel conducting the test.
2. During testing, chemical feed, scrubber overflow, recirculation and scrubber air flow rates shall be held constant. Changes in scrubber system operating conditions shall not be permitted. All fine-tuning of operating conditions shall be performed prior to testing.
3. Design operating conditions shall be maintained for a minimum of eight hours. During this time, all pertinent operating parameters shall be monitored and recorded and sufficient sampling and analysis shall be conducted to demonstrate that the air flow rate and removal efficiency are at the design conditions.
4. Ammonia and hydrogen sulfide concentrations shall be measured in each scrubber inlet and outlet. As a minimum, the test shall be conducted for 2-hour at the average levels, 2 hour at the peak levels, and the balance of 4 hours on actual plant odor conditions. Inlet and outlet levels shall be measured once every 30 minutes using gas detection tubes such as Draeger, RAE Or Equal or a portable analyzer such as Interscan, Field Environmental Instruments, Or Equal.
5. Results: A description of the performance tests shall be submitted. The ammonia and hydrogen sulfide compound removal efficiencies shall be as specified in the design and performance requirements. Should scrubber system performance not meet any of the above requirements, that system shall have failed the performance tests. The CONTRACTOR shall make any additions or modifications to that scrubber system as may be necessary, at no additional cost to OCSD, and the performance tests for that system shall be repeated in its entirety.
6. All testing costs shall be borne by CONTRACTOR. B. Odor Panel Testing:
1. An odor panel test shall be performed with natural plant odors.
2. The CONTRACTOR shall guarantee that exhaust emissions will not exceed the specified levels. The CONTRACTOR shall provide the following testing and submit analytical results to the OCSD and ENGINEER.
3. The CONTRACTOR shall submit written testing plan detailing all procedures, sampling locations, analytical procedures, laboratory services to be used, laboratory certification by the appropriate State Authority, sampling apparatus, sample transportation procedures, chain of custody forms and qualification of personnel conducting the test.
4. Each test shall consist of three (3) sets of samples taken over an eight hours period. Each set consists of two background two inlet and two outlet samples shall be drawn while conducting the odor control system performance testing.
a. Samples of ambient air upwind of the process shall be drawn as a blank.
5. These samples shall be collected, marked, transported, and tested off-site in a controlled laboratory environment by an independent testing facility using evaluation procedure ASTM E679 “Air Quality Determination of Odor Concentration by Dynamic Olfactometry”. All samples shall be evaluated within 24 HRS.
6. Samples shall be taken and transported in a manner which minimizes alteration of the samples either by contamination or loss of odorous material.
7. The results shall be determined based on subtracting both the inlet and outlet results from the average background result and based on a presentation rate of 20
L/min.
a. Average ED(50) results shall be calculated where the average blank result is subtracted from both inlet and outlet readings.
b. Prepare a test report and submit to the ENGINEER include procedures, data, calculations, and results.
8. If the odor control system fails to meet the performance criteria of this Section, it will be the CONTRACTOR's responsibility to make all modifications necessary to improve performance at no cost to OCSD.
9. CONTRACTOR shall pay for all additional testing required to verify that performance criteria are being met.
10. Successful Completion of this Testing: Used as one (1) of the considerations in
Final Acceptance of the system.
11. All testing costs shall be borne by CONTRACTOR.
C. Start-up: The services of a factory representative shall be provided as specified in
Section 1.8 to insure proper installation and start-up of the scrubber system.
3.8 CHEMICALS
A. All start-up and testing chemicals shall be provided by the CONTRACTOR. Top off all chemical tanks (NaOCl, NaOH, and H2SO4) after testing and start-up is completed.
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Leak Detection Switch