Section 11373 MIXERS

Section 11373

MIXERS

PART 1 - GENERAL

1.1 SUMMARY

A. This section includes vertical turbine mixers for continuous mixing and keeping in suspension primary sludge and/or blend of primary sludge, waste activated sludge and trickling filter sludge.

B. Related Specification Sections include but are not necessarily limited to:

1. Division 01, Additional General Requirements

2. Section 11005, Equipment: Basic Requirements

3. Section 16220, Electric Motor

4. Section 16442, Control Panels

5. Section 16418, VFD below 100 hp

6. Section 17300, Control Strategies

7. Section 17405, Process Instrumentation and Control

1.2 QUALITY ASSURANCE

A. Referenced Standards:

1. American Bearing Manufacturers Association (ABMA):

a. L-10 standards-Standards 9 and 11, Method for Evaluating and load rating of bearings.

2. American Gear Manufacturers Association (AGMA):

a. 390.03a, Gear Handbook - Gear Classification, Materials and Measuring Methods for Bevel, Hypoid, Fine Pitch Worm Gearing and Racks Only as Unassembled Gears

3. American Iron and Steel Institute (AISI)

4. American Society for Testing and Materials International (ASTM) Standards

5. American Welding Society Publication (AWS)

6. Institute of Electrical and Electronics Engineers (IEEE)

7. National Electrical Manufacturers Association Standards

8. Occupational Safety and Health Administration (OSHA) Standards

B. Manufacturer shall have Quality Assurance System in place which complies with NQA-1, ISO 9001. Upon request from the Engineer, the manufacture shall submit to an audit to verify compliance with the referenced standards.

C. The mixers and all components specified in this Section shall be warranted by the manufacturer for a minimum three (3) 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.

1.3 SUBMITTALS

A. Shop Drawings:

1. See Section 11005, Equipment: Basic Requirements, for requirements for the mechanics and administration of the submittal process.

2. Product Technical Data Including:

a. Acknowledgement that products submitted meet requirements of standards referenced.

b. General:

1) Materials.

2) Parts.

3) Accessories.

4) Assembly.

5) Installation.

6) Complete anchorage detail.

7) Recommended spare part lists. c. Mixers:

1) Manufacturer.

2) Type and model.

3) Design rotative speeds.

4) Bearing types and life calculations.

5) Dimensions and net weight.

6) Materials of construction.

7) Mounting Requirements and Design Forces: Torque and bending load.

8) Disassembly procedure for impeller access.

9) Calculations supporting all shaft and impeller design criteria (stress and critical speed).

10) Certified test reports verifying quality of gears in gear reduction units. d. Drive units:

1) Manufacturer.

2) Type and model.

3) Rated size.

4) Temp rating and service factor.

5) Dimensions and weight.

6) Lubrication systems.

7) Loadings, torque, and forces imposed by operating equipment. e. Verification of bearing life.

PART 2 - PRODUCTS

2.1 ACCEPTABLE MANUFACTURERS

A. Subject to compliance with the Contract Documents, the following manufacturers are acceptable:

1. Mixing Equipment Co., Inc. (Lightning).

2. Philadelphia Mixers.

3. Hayward Gordon.

4. Or Equal.

2.2 MATERIALS

A. Blend Tank Mixer:

1. Gear Drive Housings: Fabricated steel or Cast iron, ASTM A48.

2. Gear Reducer Case: Fabricated steel or Cast iron, ASTM A48.

3. Impeller Shaft: Stainless steel, AISI 316.

4. Impeller: Stainless steel, AISI 316.

5. Output Shaft: Stainless steel, AISI 316.

6. Output Coupling: Stainless steel, AISI 316.

7. Fasteners Inside Tankage: Stainless steel, AISI 316.

8. Shop Coating:

a. Paint all none machined surfaces other than stainless steel or galvanized steel (excluding electrical conduit):

1) Sandblast per SSPC-SP-5

2) Primer and Finish Paint: Tnemec series 104 epoxy, Carboline, Or Equal.

3) Primer Coat: 6 mils dry film thickness

4) Finish Coat: 6 mils dry film thickness

9. Oil Piping: 316 stainless steel or brass. No tubing will be allowed.

B. Emulsion Polymer Tank Mixer:

1. Gear Drive Housings: Fabricated steel or Cast iron, ASTM A48.

2. Gear Reducer Case: Fabricated steel or Cast iron, ASTM A48.

3. Structural steel: minimum 1/4-inch thickness, ASTM A36.

4. Impeller Shaft: Stainless steel, AISI 316.

5. Impeller: Stainless steel, AISI 316.

6. Output Shaft: Stainless steel, AISI 316.

7. Output Coupling: Stainless steel, AISI 316.

8. Fasteners: Stainless steel, AISI 316, minimum 1/2-inch diameter.

9. Shop Coating:

a. Paint all none machined surfaces other than stainless steel or galvanized steel

(excluding electrical conduit):

1) Sandblast per SSPC-SP-5.

2) Primer and Finish Paint: Tnemec series 104 epoxy, Carboline, Or Equal.

3) Primer Coat: 6 mils dry film thickness.

4) Finish Coat: 6 mils dry film thickness.

C. Polymer Mixing/Aging Tank Mixer:

1. Gear Drive Housings: Fabricated steel or Cast iron, ASTM A48.

2. Gear Reducer Case: Fabricated steel or Cast iron, ASTM A48.

3. Structural steel: minimum 1/4-inch thickness, ASTM A36.

4. Impeller Shaft: Stainless steel, AISI 316.

5. Impeller: Stainless steel, AISI 316.

6. Output Shaft: Stainless steel, AISI 316.

7. Output Coupling: Stainless steel, AISI 316.

8. Fasteners: Stainless steel, AISI 316, minimum, 1/2-inch diameter.

9. Shop Coating:

a. Paint all unmachined surfaces other than stainless steel or galvanized steel

(excluding electrical conduit):

1) Sandblast per SSPC-SP-5.

2) Primer and Finish Paint: Tnemec series 104 epoxy, Carboguard 891Or

Equal.

3) Primer Coat: 6 mils dry film thickness.

4) Finish Coat: 6 mils dry film thickness.

2.3 PERFORMANCE AND DESIGN REQUIREMENTS

A. Blend Tank Mixers:

1. Number of Tanks: 3.

2. Number of Units: 3 (one per tank).

3. Mixer Tag ID: 15LMXR023, 15LMXR043, and 15LMXR063

4. Tank Dimensions:

a. Length: 21 feet. b. Width: 21 feet.

c. Height: 40 feet from top of sloped tank bottom to top of tank.

5. Liquid Elevations in Feet and Sludge Concentrations for Start up Phase:

Type of Sludge	Solids Concentration	Minimum Liquid Elevation, feet	Maximum Liquid Elevation, feet
Primary Sludge	4 percent	16.4	20.5
Blended sludge	2 percent	26.6	29.1

Sludge solids may include rags and grit.

6. Liquid Elevations in Feet and Sludge Concentrations for Design Phase:

Type of Sludge	Solids Concentration	Minimum Liquid Elevation, feet	Maximum Liquid Elevation, feet
Primary Sludge	4 percent	16.7	19.2
Blended sludge	2 percent	27.3	30.7

7. Number of Propellers per Mixer: Two (2)

8. Bottom Impeller Diameter: 59 inches, minimum.

9. Top Impeller Diameter: 88 inches, minimum.

10. Motor hp: 7-1/2 hp max.

11. Max Rotating Speed: 30 rpm.

12. Min Shaft Diameter: 8 inches

13. Impeller Shaft Design: 92 percent of first lateral critical speed.

14. Shaft Length: As indicated on Drawing M5-3001.

15. Drive Type: VFD

16. Bearing Life at Full Nameplate hp: Minimum ABMA L-10 of 100,000 hours at full load and speed.

17. Warranty: The manufacturer shall provide a full mechanical warranty for a period of twelve (12) months after successful completion of equipment installation. If the equipment should fail during the warranty period due to a defect in the workmanship design or material, the manufacturer shall replace the affected part(s), and restore the equipment to service.

B. Emulsion Polymer Tank Mixers:

1. Number of Tanks: 2.

2. Number of Units: 2 (one per tank).

3. Mixer Tag ID: 15MMXR803 and 15MMXR813

4. Tank Dimensions:

a. Diameter: 8 feet. b. Height: 18.5 feet.

c. Tank capacity: 6,000 gal.

5. Liquid Depths and Polymer Type:

Type of Polymer	Percent Active	Viscosity cps	Minimum Liquid Depth, inch	Maximum Liquid Depth, inch
Emulsion	40 percent	4,000	60	192

6. Number of Impellers per Mixer: Two (2).

7. Bottom Impeller Diameter: 42 inches maximum.

8. Top Impeller Diameter: 42 inches maximum.

9. Motor hp: 7.5 hp maximum.

10. Max Rotating Speed: 100 rpm.

11. Impeller Shaft Design: maximum 75 percent of first lateral critical speed.

12. Impeller Type: Wide blade Hydrofoil.

13. Shaft Diameter: 2.5 inch minimum.

14. Drive Type: Constant speed.

15. Bearing Life at Full Nameplate hp: Minimum ABMA L-10 of 100,000 hours at full load and speed.

16. Warranty: The manufacturer shall provide a full mechanical warranty for a period of three (3) years from the beneficial start-up date. If the equipment should fail during the warranty period due to a defect in the workmanship design or material, the manufacturer shall replace the affected part(s), and restore the equipment to service.

C. Polymer Mixing/Aging Tank Mixers:

1. Number of Tanks: 6

2. Number of Units: 6 (one per tank)

3. Mixer Tag ID: 15LMXR752, 15LMXR762, 15LMXR772, 15MMXR852,

15MMXR862, and 15MMXY872

4. Tank Dimensions:

a. Diameter: 8 feet

b. Height: 13 feet

c. Tank capacity: 4,100 gal

5. Liquid Depths and Polymer Type:

Type of Polymer	Percent Active	Viscosity cps	Minimum Liquid Depth, inch	Maximum Liquid Depth, inch
Emulsion	0.5 percent	1,200	32	132

6. Number of Impellers per Mixer: Two (2).

7. Bottom Impeller Diameter: 42 inches maximum.

8. Top Impeller Diameter: 42 inches maximum.

9. Motor hp: 5 hp maximum.

10. Max Rotating Speed: 100 rpm.

11. Impeller Shaft Design: Maximum 75 percent of first lateral critical speed.

12. Impeller Type: Hydrofoil blade.

13. Shaft Diameter: 2.0 inch, minimum.

14. Drive Type: Constant speed.

15. Bearing Life at Full Nameplate hp: Minimum ABMA L-10 of 100,000 hours at full load and speed

16. Warranty: The manufacturer shall provide a full mechanical warranty for a period of three (3) years from the beneficial start-up date. If the equipment should fail during the warranty period due to a defect in the workmanship design or material, the manufacturer shall replace the affected part(s), and restore the equipment to service.

2.4 FABRICATION AND MANUFACTURE A. Blend Tank Mixer:

1. Impeller:

a. Minimum impeller diameter and maximum operating speed will be as previously specified.

b. Dynamically and hydraulically stable. c. Blades shall be bolted to impeller hub.

d. The impeller hub shall attach to the shaft by means of a hook key designed to prevent the impeller from slipping down the shaft even if the set screws are not tightened.

e. Maximum combined shear stress on impeller component not to exceed

12,000 pounds per inch under maximum operation load

f. Blend Tank: The shaft-impeller system design shall be such that its operating speed shall not exceed 92 percent of its first lateral critical speed. The use of stabilizing rings or fins will not influence this limitation.

g. Emulsion Polymer and Polymer Mixing/Aging Tank: The shaft-impeller system design shall be such that its operating speed shall not exceed 75 percent of its first lateral critical speed for blend tank mixers. The use of stabilizing rings or fins will not influence this limitation.

B. Impeller Shafts:

1. Blend Tank Mixers:

a. The agitator shaft shall be of the above specified grade of material. The shaft shall be designed such that the maximum combined shear stress shall not exceed 11,000 pounds per inch under maximum operating loads. It shall be of overhung design - the use of underwater steady bearings is not permitted.

b. Shafts shall be manufactured to a minimum straightness such that they are straight to within 1/8 inches per every 10 feet of length. Certification of straightness at time of shipment shall be provided by the manufacturer for each shaft.

c. Liquid immersed impeller shaft supported bearings are NOT ACCEPTABLE. d. Shaft support bearings located below top cover of blend tank are NOT

ACCEPTABLE.

2. Emulsion Polymer Tank Mixers:

a. The agitator shaft shall be of the above specified grade of material. The shaft shall be designed such that the maximum combined shear stress shall not exceed 9,000 pounds per inch under maximum operating loads. It shall be of overhung design - the use of underwater steady bearings is not permitted.

b. Shafts shall be manufactured to a minimum straightness such that they are straight to within 1/8 inches per every 10 feet of length. Certification of straightness at time of shipment shall be provided by the manufacturer for each shaft.

c. Liquid immersed impeller shaft supported bearings are NOT ACCEPTABLE. d. Shaft support bearings located below top cover of blend tank are NOT

ACCEPTABLE.

3. Polymer Mixing/Aging Tank Mixers:

a. The lower mixer shaft shall be connected to the upper, or drive output shaft, by means of a rigid flanged coupling, of either the welded or interference fit hub type. Coupling face shall have a rabbeted male and female piloted connection for accurate concentricity and shall not require match marks for alignment. If located above tank top surface. Coupling material of construction must match that of the agitator shaft.

b. The agitator shaft shall be of the above specified grade of material. The shaft shall be designed such that the maximum stress shall not exceed 9,000 pounds per inch under maximum operating loads. Lower shaft straightness, rigid coupling squareness, and output shaft accuracy must be such that the maximum total indicated runout at the lower end of the shaft does not exceed 1/8 inch for every

10 feet of overhang, as measured when turning over by hand.

c. Liquid immersed impeller shaft supported bearings are NOT ACCEPTABLE.

C. Blend Tank Mixers Gear Reducer:

1. Designed and rated per AGMA standards.

2. Type:

a. Right angle gear drive:

1) Pedestal mounting.

b. Quill-type drive shaft, independent bearing support with flexible coupling connected to output shaft above the reducer.

c. Separate agitator shaft bearings located above and below the main drive bearings.

d. Combination helical, spiral bevel, and pinion drive gears. e. Totally enclosed.

f. Worm gears not acceptable.

3. Service Factor: 2.0 of nameplate on motor.

4. Gearing: AGMA #10 or better (AGMA 390.03a).

5. Gear motor attachments to reduce speed will not be allowed.

6. Bearing Design:

a. All drive bearings shall be of antifriction type, tapered roller bearings.

b. All bearings within the drive, except for the output shaft bearings, shall have minimum AFBMA L-10 lives of 100,000 hours when operating at full motor nameplate horsepower at design speed.

c. Output shaft bearings shall have a minimum L-10 life of 250,000 hours.

7. Lifting Lugs:

8. Mixer Supports: Manufacturer will be responsible for designing all required support system for the mixer. Support system shall be designed such that mixer can be removed intact with impellers from the tank. Intermediate supports within the tank will not be permitted.

9. Lubrication:

a. All gearing and bearings shall be located in a single housing and lubricated by a common oil bath. The use of an auxiliary reducer to achieve the required output speed will not be acceptable.

b. Lubrication of each speed reducer shall be accomplished by bearings and gears being splash lubricated or immersed in oil.

c. Grease lubricated bearing are acceptable on the output shaft, provided adequate sealing is provided to separate them from the oil bath.

d. Thermal rating of gear reducer must exceed the design mechanical rating. e. No external cooling devices are allowed.

f. Dipstick oil level indicators

g. Adequate separation between oil and grease lubricated parts. h. Oil breather located above possible oil foam level.

i. Drives which utilize an oil pump feature will not be allowed.

10. Lubricating provisions:

a. Oil drain:

1) Minimum 6 inches above top of bridge.

2) Piped discharge to portable waste oil container.

3) Supply a minimum of two (2) waste oil containers.

b. Each drive must have an effective drywell feature to eliminate oil leakage down the output shaft. The base of this drywell feature must be integral to the reducer housing casting.

c. Drywell configurations in which the base is threaded into the gearbox housing will not be acceptable.

d. Grease fittings protected by removable neoprene cover and easily accessible.

e. Greased bearings with seal to retain grease.

11. Reducer output shaft and impeller shaft:

a. Oversized for direct, rigid coupling to impeller shaft below reducer.

b. Maximum indicated runout not to exceed 1/8 inch for every 10 feet of overhang, as measured when turning by hand.

c. Maximum Stress: 9,000 pounds per inch at maximum load.

d. Independent bearing support between output shaft and hollow quill drive shaft to isolate speed reducer from shock loads, impeller bending loads, and the weight of impeller shaft.

e. Torsionally resilient, flexible coupling between hollow quill drive shaft and output shaft above the reducer.

12. Flexible Couplings:

a. Connect motor and gear reducer.

b. Design to withstand continuous full load motor horsepower including torques to 150 percent of full load running torque. Minimum 1.5 service factor.

13. Bump Ring:

a. Mixer manufacturer shall provide a stainless steel bump ring at the bottom of the tank that will prevent the impeller shaft from failure due to torsional bending.

b. Bump ring shall not normally be in contact with the impeller or impeller shaft. D. Emulsion Polymer Tank Mixers Gear Reduction Unit:

1. The mixer gear drive must be built and rated in accordance with the current AGMA Standard 6010-E88. The AGMA calculated drive HP rating shall be stamped on drive nameplate. Housings and/or covers not composed entirely of metal will not be allowed. Plastic or fiberglass housing components will not be allowed. Fabricated housings will not be allowed.

2. Lifting Lugs: Supply lifting eyes for installation and removal. Gear reducers without lifting eyes will not be allowed.

3. All gear reducers shall incorporate only helical gearing to insure highest efficiency coupled with convenience of mounting, maintenance, and installation. It shall not be necessary to remove the motor to perform routine maintenance on the speed reducer. Worm gears and spiral bevel gears are not acceptable.

4. Gearing shall be of AGMA Quality 10 (ten) or better per AGMA Standard 390.03a and ANSI/AGMA 2000-A88.

5. All gearing and bearings shall be located in a single housing and lubricated by a common oil bath. The use of an auxiliary reducer to achieve the required output speed will not be acceptable.

6. The drive's minimum AGMA service factor, based upon motor nameplate horsepower, will be 2.0. Mixer supplier must submit gear rating calculations with approval drawings.

7. The mixer gear drive shall be designed with a shaft and bearing system suitable for the loadings imposed by the application. All designs shall be based upon the hydraulic loadings experienced in this specific mixing application. Standard commercial gear drives will not be acceptable.

8. Bearings:

a. All drive bearings shall be of antifriction type, tapered roller bearings. All bearings within the drive, except for the output shaft bearings, shall have minimum AFBMA L-10 lives of 100,000 hours when operating at full motor nameplate horsepower at design speed.

b. Output shaft bearings shall have a minimum L-10 life of 100,000 hours.

c. Mixer supplier must submit bearing life calculations, with approval drawings. Bearing calculations must be based upon hydraulic loadings as seen in this specific mixing application.

9. The thermal rating of the gear reducer must exceed the design mechanical rating. No external cooling devices are allowed.

10. Lubrication of each speed reducer shall be accomplished by bearings and gears being splash lubricated or immersed in oil. The drive shall be provided with a dipstick to observe oil level. Grease lubricated bearing are acceptable on the output shaft, provided adequate sealing is provided to separate them from the oil bath.

11. Each drive must have an effective drywell feature to eliminate oil leakage down the output shaft. The drywell feature must be integral to the reducer housing casting. Drywell configurations in which the base is threaded or press fit into the gearbox housing will not be acceptable.

12. All oil fill and drain lines shall be located so as to be easily accessible, with the oil drain located at least 12 inches above the mounting elevation (pedestal mounted.) All gearing must be contained within a single housing and lubricated by a common oil bath.

13. The pedestal mount shall be of the “milk stool” type. I-beam type pedestals will not be accepted.

14. Gear motor attachments to reduce speed will not be allowed.

15. Drives which utilize an oil pump feature will not be allowed. E. Polymer Mixing/Aging Tank Mixers Gear Reduction Unit:

1. The mixer gear drive must be built and rated in accordance with the current AGMA Standard 6010-E88. The AGMA calculated drive HP rating shall be stamped on drive nameplate. Housings and/or covers not composed entirely of metal will not be allowed. Plastic or fiberglass housing components will not be allowed. Fabricated housings will not be allowed.

2. Lifting lugs: Supply lifting eyes for installation and removal. Gear reducers without lifting eyes will not be allowed.

3. All gear reducers shall incorporate only helical gearing to insure highest efficiency coupled with convenience of mounting, maintenance, and installation. It shall not be necessary to remove the motor to perform routine maintenance on the speed reducer. Worm gears and spiral bevel gears are not acceptable.

4. Gearing shall be of AGMA Quality 10 (ten) or better per AGMA Standard 390.03a and ANSI/AGMA 2000-A88.

5. All gearing and bearings shall be located in a single housing and lubricated by a common oil bath. The use of an auxiliary reducer to achieve the required output speed will not be acceptable.

6. The drive's minimum AGMA service factor, based upon motor nameplate horsepower, will be 2.0. Mixer supplier must submit gear rating calculations with approval drawings.

7. The mixer gear drive shall be designed with a shaft and bearing system suitable for the loadings imposed by the application. All designs shall be based upon the hydraulic loadings experienced in this specific mixing application. Standard commercial gear drives will not be acceptable.

8. Bearings:

a. All drive bearings shall be of antifriction type, tapered roller bearings. All bearings within the drive, except for the output shaft bearings, shall have minimum AFBMA L-10 lives of 100,000 hours when operating at full motor nameplate horsepower at design speed.

b. Output shaft bearings shall have a minimum L-10 life of 100,000 hours.

c. Mixer supplier must submit bearing life calculations, with approval drawings. Bearing calculations must be based upon hydraulic loadings as seen in this specific mixing application.

9. The thermal rating of the gear reducer must exceed the design mechanical rating. No external cooling devices are allowed.

10. Lubrication of each speed reducer shall be accomplished by all bearings and gears being packed in grease.

11. Gear motor attachments to reduce speed will not be allowed.

12. Drives which utilize an oil pump feature will not be allowed. F. Noise:

1. The full load operating noise levels of the mixer drives shall meet current OSHA Occupational noise standards, and/or AGMA standard 299.1, and shall not exceed

85 dBA at 3 feet from any part of the drive assembly.

G. Motor: In addition to Section 16220, Electric Motors, requirements;

1. 460 V, 3 phase, 60 Hz

2. TEFC, 1.15 SF

3. Premium efficiency motor

4. 1,750 rpm maximum

H. Controls:

1. Controls shall comply with Section 16442, Control Panels, applicable sections of

17405, Process Instrumentation and Control, and Section 17300, Control Strategies, and the following supplemental requirements. A control panel shall be provided for each mixer and shall be wall mounted in the locations shown on the Drawings. The Mixer Vendor’s PLCs with embedded software shall be in a PLC panel. Components required for operation of the mixer shall conform to the requirements set forth in Divisions 16 and 17.

2. Control panels shall have integral circuit breaker for over-current protection and disconnect function with pad lockable operator. Control power shall be 120V.

3. Variable Frequency Drives will be furnished and installed in the Motor Control Centers as specified in Section 16418, Variable Frequency Drives Below 100 HP and Section 16480, Low Voltage Motor Control. The mixer manufacturer shall provide control logic with fuse protection that will control the VFD and shall shut down the motor and provide a fail alarm signal on motor/grinder overload, as specified below.

4. Either relays or solid state Logic Controllers that are used to perform the specified functions shall be as specified in Section 16442, Control Panels. Should CONTRACTOR elect to use solid state logic controllers, provide a programming device and an electronic copy of the program and software used to develop the program, licensed to OCSD.

a. The PLC shall be a Modicon furnished with software and licenses. A copy of the program shall be provided on CD. (Two copies of program and documentation if “or equal” is used). Documentation shall include each coil, contact, function description. Each rung shall include a description indicating what each rung logically does.

5. The mixer control panel shall be provided with selector switches and display lights as indicated in the Electrical and Instrumentation drawings. A Hand-Off-Remote selector switch shall be provided to allow local operation when in HAND and Remote operation of the grinder by the OCSD’s PLC when in Remote.

6. The mixer PLC shall monitor/control signals as shown on the Drawing and described in Section 17300, Control Strategies.

PART 3 - EXECUTION

3.1 INSTALLATION

A. Installation of all bolts and nuts:

1. Thoroughly clean all threads of all debris.

2. Clean all contact surfaces of debris, sand and grit.

3. Tighten all bolts/nuts with a calibrated torque wrench which has been tested and calibrated within one week of its use on this Project.

3.2 MAINTENANCE OF INSTALLED EQUIPMENT

A. Maintain the operability and functionality of all installed equipment between the time of installation and the commissioning period. See Specification section 01660, Shipping, Storage and Handling Requirements, for requirements.

3.3 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 four separate site visits as follows:

1. Inspection of equipment installation – two trips (8 hours minimum, each)

2. Training of OCSD personnel. See Specification section 01820 for requirements.

3. Commissioning. See Specification section 01810 for requirements. Number of trips and hours shall be as required to meet all testing and commissioning requirements, but shall not be less than 40 hours.

3.4 ADJUSTMENTS AND TESTING A. Operating Checks:

1. Pre-operation Checks:

a. Impeller shaft alignment:

1) Test impeller shaft by hand turn operation.

2) Deflection: Not to exceed 1/8 inch per 10 feet of length. b. Speed Reducer: Bearing lubrication.

c. Impeller rotation.

d. Motor Shaft: Input shaft alignment. e. Water level in mixing tanks.

f. Ensure mixing tanks is clear of debris which could damage the impellers.

2. Post-Operation Checks:

a. Check bearing temp against manufacturer’s recommendation. b. Check for motor overload.

c. Check vibration.

1) Test gearbox unit for vibration when operated by motor.

2) Maximum Allowable Vibration: 0.4 inch/second anywhere on motor or speed reducer.

3. Testing:

a. Costs:

1) OCSD will pay for energy costs associated with testing.

2) OCSD will supply water and sludge necessary for testing.

3) CONTRACTOR will pay for all other costs associated with testing and retesting.

b. Failure to perform:

1) Equipment not meeting specified performance requirements will not be accepted.

2) CONTRACTOR to remove equipment, modify, reinstall, and retest as required to meet requirements.

c. Test personnel and equipment:

1) Personnel: Qualified and familiar with operation of equipment finished.

2) Equipment: Calibrated.

d. All tests performed in presence of ENGINEER.