Section 13211 HIGH DENSITY POLYETHYLENE TANKS

Section 13211

HIGH DENSITY POLYETHYLENE TANKS

PART 1 - GENERAL

1.1 THE REQUIREMENT

A. The CONTRACTOR shall furnish and install High Density Polyethylene storage tanks, complete and operable, as shown and specified herein including appurtenances and accessories, in accordance with the requirements of the Contract Documents.

1.2 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 06610, Glass Fiber and Resin Fabrications

1.3 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.	Codes and Regulations CCR	California Code of Regulations, Title 24, Part 2,
		California Building Code (CBC)
2.	Industry Standards:
	ASTM International (ASTM):
	D638	Standard Test Method for Tensile Properties of Plastics
	D883	Standard Terminology Relating to Plastics
	D1505	Standard Test Method for Density of Plastics by the Density-Gradient Technique
	D1525	Standard Test Method for Vicat Softening Temperature of Plastics
	D1693	Standard Test Method for Environmental Stress- Cracking of Ethylene Plastics
	D 1998	Standard Specification for Polyethylene Upright Storage Tanks
	D 2837	Standard Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials or Pressure Design Basis for Thermoplastic Pipe Products

3. American National Standards Institute (ANSI):

ANSI/ASME B16.4 Gray Iron Threaded Fittings

ANSI/ASME B16.5 Pipe Flanges and Flanged Fittings

ANSI/IEEE 515 Cables, Heating-Testing, Design, Installation, and Maintenance of Electrical Resistance Heat Tracing for Industrial Applications

ANSI/NSF 61 Standard for Drinking Water System

Components – Health Effects

4. National Fire Protection Association (NFPA):

NFPA 30 Flammable and Combustible Liquid Code

National Electrical Code (NEC)

National Electrical Manufacturer's Association (NEMA)

ARM: Low Temperature Impact Resistance (Falling Dart Test Procedure)

1.4 DESIGN CRITERIA A. Tanks:

1. Sulfuric Acid Tanks:

a. Number: 1.

b. Rated Volume: 5,000 gallons.

c. Diameter: 7 feet-10 inches, maximum diameter 8 feet.

d. Configuration: Vertical, flat bottom with integrally molded flanged outlet. e. Chemical Service: 98 percent Sulfuric Acid (H2SO4).

f. Overall Height: 16 feet.

g. Liquid Specific Gravity: 1.85.

h. Design specific gravity: 2.2 minimum

B. Tank Shell Thickness:

1. In accordance with ASTM D 1998, Section 6.1.

2. Design tank wall thickness for minimum specific gravity of 2.2 minimum.

3. Provide adequate thickness at all fittings and connection points for mounting of fittings to the tank without damage to the tank or causing excessive deflection.

4. Maximum allowable hoop stress used in tank wall thickness calculations per

ASTM D 1998 shall be based on test data per ASTM D 2837.

C. Restraint System: Select one restraint system to resist both seismic and wind loads.

1. Seismic Load Restraint System:

a. Seismic Design Criteria: As specified in Section 01332, Seismic Design

Data.

b. Consist of cable ties and anchoring system.

2. Wind Load Restraint System:

a. Wind Design Criteria: As specified in Section 01334, Wind Design Data.

b. If the wind load restraint system includes the use of cables, tensioning and adjustment devices, such as turnbuckles, shall be used to allow for easy adjustment of the cables at the time of construction and as required in the future.

1.5 SUBMITTALS

A. Submittals shall be made in accordance with the General Requirements, Additional

General Requirements and as specified herein.

B. Fabrication Drawings for Each Tank Including:

1. Dimensions.

2. Tank wall thickness.

3. Materials of construction.

4. Tank fittings, sizes, and locations.

5. Tank appurtenances and locations.

6. Tank restraint system.

7. Tank resin and hoop stress data.

C. Engineering design calculations of restraint system signed by a Civil or Structural

Engineer registered in the State of California.

D. Complete information on basic materials including chemical resistance charts and verification of chemical compatibility.

E. Installation instructions. F. Warranty.

G. Certification to certify that each tank is suitable for the specified chemical service, including tank fittings and gasket material.

H. Proof of qualification.

1.6 WARRANTY

A. The tanks and all components specified in this section shall be warranted by the manufacturer for a minimum five (5) 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. Prorated warranties are not acceptable.

1.7 QUALITY ASSURANCE

A. Qualification of Manufacturer: Manufacturer with experienced personnel, physical facilities, and management capacity sufficient to produce custom-made rotationally molded polyethylene tanks of the size, exposure and chemical services specified for minimum 5 years with satisfactory performance record.

PART 2 - PRODUCTS

2.1 SCOPE OF SUPPLIES

A. Provide all materials, labor, equipment, and hardware to provide all polyethylene storage tanks with specified fittings and accessories, seismic and wind load restraint systems, anchor bolts, fasteners, manual shutoff valve, and flange flexible connectors for complete installation in the positions and orientations indicated on the Drawings.

2.2 MANUFACTURERS

A. One of the following:

1. Poly Processing Company.

2. Snyder.

3. Or Equal.

2.3 TANK MATERIALS

A. High density crosslinked polyethylene in accordance with ASTM D 1998. B. Resin: Virgin crosslinkable polyethylene.

1. Manufacturers:

a. PAXON, grade 7204 resin.

b. Metallocene crosslinked resin c. Or Equal.

C. Ultra Violet Stabilizer: Add 0.5 percent stabilizer, in the type and amount recommended by the resin manufacturer.

D. Free of holes, blisters, crazing, cracking, delamination, undispersed raw materials and any sign of contamination from foreign matter.

E. Resin shall meet or exceed the following properties:

Property	ASTM Test	Nominal Value
Density	D 1505	Between 0.938 and 0.944 grams per cubic centimeter
Environmental stress cracking resistance, 10 percent lgepal	D 1693 Condition A	F0 > 1,000 hours minimum
Ultimate tensile strength	D 638 Type IV Specimen	2,750 pounds per square inch at 2 inch/minute
Flexural Modulus	D 790	100,000 pounds per square inch.
Elongation at break	D 638 Type IV Specimen	450 percent at 2 inch/ minute maximum
Vicat softening point	D 1525	245 degrees Fahrenheit minimum
Impact Brittleness temperature	D 746	Minus 180 degrees Fahrenheit maximum
Dart impact resistance (1/4 inch thick)	D 1998	190 foot-pounds at minus 40 degrees Fahrenheit

F. Gel Test:

1. Inner Portion of Tank Wall: Not less than 65 percent.

2. Entire Wall Thickness: Not less than 80 percent. G. Restraint System:

1. Metal Components, Include Anchor Bolts: Type C-276 Hastelloy.

2. Concrete anchors or flush shells shall not be used.

H. Tank Lining:

1. Tank shall have oxidation resistant liner with resin bonded to the interior surface during the manufacturing process. Resin to be certified by NSF/ANSI 61 for chemical storage.

2. The oxidation resistant liner system shall consist of one-piece seamless construction.

3. The oxidation resistant resin shall be medium density polyethylene.

2.4 FITTINGS

A. Provide tanks with integrally-molded flanged outlets (IMFO). B. Terminate in socket, threaded, or flanged connections.

1. Flanges: 150 pound ANSI/ASME B 16.5. a. Gaskets: Teflon.

b. Bolts: Hastelloy C-276, as required for chemical compatibility. Bolts through tank wall shall have polyethylene encapsulated heads.

2. Threaded Connections: ANSI/ASME B 16.4.

C. Fitting shall keep sulfuric acid from contacting tank wall cross section.

D. Fittings at Upper Tank Sidewall or Top: Compression threaded type, long shank, chlorinated polyvinyl chloride (CPVC) flanged fittings with deep cut threads (not injection molded thread) and with dual wide nuts. All threads to be American pipe thread cut.

E. Fittings on Tank Top: Fittings shall be vertical.

F. Tank Instruments: Tank instruments shall only be placed on top of tank flat areas.

G. Flanged Outlet Drain Fitting in the Lower Tank Sidewall: Integrally molded into the bottom knuckle of the tank to allow full drainage of tank contents.

H. Fittings and Appurtenances for Sulfuric Acid Storage Tank:

1. One – 3 inch flanged drain nozzle, integrally-molded with tank wall.

2. One – 2 inch flanged transfer pump feed outlet nozzle.

3. One – 3 inch flanged fill nozzle.

4. One – 4 inch flanged overflow nozzle.

5. One – 6 inch flanged roof nozzle for mounting of tank level sensor.

6. One – 6 inch flanged roof nozzle for mounting of tank level float.

7. One – 6 inch flanged roof vent.

8. One – 24-Inch Flanged Type Molded-In Top Manway: Mechanically attached manways shall be not accepted. Lid shall be of same material as tank with polyethylene bolts.

9. One – 24-Inch Flanged Type Mechanically Attached Side Manway: Side manway shall be chemically compatible with sulfuric acid and shall have Teflon gaskets, and C-276 Hastelloy hardware. Bolts penetrating the tank shall have polyethylene encapsulated heads.

I. Provide flanged flexible connectors for each pipe connection.

1. Provide Teflon flexible connector with CPVC flanges and C-276 hardware on the tank outlet, overflow and fill pipes.

2.5 ACCESSORIES

A. Lifting Lugs: Provide tanks with molded-in lifting lugs.

B. Inside Down-Pipe: Provide tanks with inside down-pipes for tank fill connection. C. Pipe Supports:

1. Provide pipe supports, with maximum spacing of 4 feet on center, for tank fill and overflow lines using Hastelloy bolts with polyethylene encapsulated heads.

D. Tank Ladder and Tank Access: Provide in accordance with Occupational Safety and

Health Administration Standards and Section 06610, Glass Fiber and Resin Fabrications.

1. Provide 3 feet wide fiberglass platform around the tank with caged access ladder. Support ladder directly on the concrete foundation, not on grating. Top of platform grating shall be located 42-inches below top of tank.

2. Provide fiberglass handrail with toe board around tank platform.

3. Provide fiberglass ladder safety gate.

4. Metal components: Hastelloy C-276.

5. Fasteners: C-276 Hastelloy.

6. Anchor Bolts: C-276 Hastelloy. E. Restraint System:

1. Seismic system to be designed to meet the proper seismic zone and specified wind load. All seismic and wind calculations and drawings shall be stamped by qualified and licensed Engineer in the State of California.

2. Seismic restraint system shall consist of tie cables and anchoring. All component of the seismic restraining system shall be C-276 Hastelloy.

F. Conduit Supports:

1. Exterior conduit supports shall be provided on the side of the tank for each quadrant containing instrumentation flanges.

2. Conduit supports shall be spaced at a maximum of 8 feet.

2.6 TANK FABRICATION

A. Rotationally molded construction in accordance with ASTM D 1998. B. Provide for Each Tank the Following Shop Finishing:

1. Shipping Label Identifying:

a. Tank tag number. b. Chemical service.

2. Coating:

a. Coating of polyethylene tanks is not required.

3. Permanent Labels:

a. Identification label.

b. National Fire Protection Association label specifically coded for the tank contents in accordance with NFPA 30.

c. Paint or affix label onto the tank wall to be clearly visible from outside the tank enclosure.

2.7 TESTING

A. Each tank shall be leak tested by the manufacturer prior to shipment by filling with clean water for a period of at least 4 hours with all fittings installed and blinded. There shall be no measurable drop in liquid surface. Any leaks shall be noted and repaired and the tank shall be re-tested for an additional 4 hours minimum. Reason for leak and method of repair shall be recorded and submitted to the ENGINEER. Any defects or leaks that have not been adequately repaired will be cause for rejection of the tank.

PART 3 - EXECUTION

3.1 INSTALLATION A. General:

1. Transportation, handling, storage of the tanks, and installation shall be in accordance with the manufacturer's printed instructions.

2. Repair any damage to tank components or the insulation due to transportation or installation.

3. Install piping to tank with sufficient flexibility to allow tank movement of 1 inch in any direction without damage to piping.

B. Testing:

1. Field Testing/Inspection: After final installation, each tank shall be hydrostatically tested BY THE CONTRACTOR to detect any damage during shipment and installation.

3.2 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 two separate site visits as follows:

1. Inspection of equipment installation (4 hours minimum)

2. Training of OCSD Personnel: See Specification section 01820, Training of

OCSD Personnel, for requirements.