33_34_00.pdf

SECTION TABLE OF CONTENTS

DIVISION 33 - UTILITIES

SECTION 33 34 00

FORCE MAINS AND INVERTED SIPHONS; SEWER

04/08

PART 1 GENERAL

1.1 REFERENCES

1.2 DELIVERY, STORAGE, AND HANDLING

PART 2 PRODUCTS

2.1 PIPE AND FITTINGS

2.1.1 Plastic Pipe

2.1.1.1 PE Pipe

2.1.1.2 Polypropylene Pipe

2.1.1.3 PVC Pipe

2.2 JOINTS

2.2.1 PE Piping

2.2.2 PVC Piping

2.3 VALVES

2.3.1 Valves

2.4 VALVE VAULTS

2.5 MISCELLANEOUS MATERIALS

2.5.1 Joint Lubricants

2.5.2 Bolts, Nuts and Glands

PART 3 EXECUTION

3.1 INSTALLATION

3.1.1 Cutting

3.1.2 Laying

3.1.3 Jointing

3.1.3.1 Joints for PE Pipe

3.1.3.2 Joints for PVC Pipe

3.1.4 Installation of Valves

3.1.5 Installation of Valve Boxes

3.2 HYDROSTATIC TESTS

3.2.1 Pressure Test

3.2.2 Retesting

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SECTION 33 34 00 Page 1

SECTION 33 34 00

FORCE MAINS AND INVERTED SIPHONS; SEWER

04/08

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

ASTM INTERNATIONAL (ASTM)

ASTM D1785 (2012) Standard Specification for Poly(Vinyl Chloride) (PVC), Plastic Pipe, Schedule 80

ASTM D2241 (2015) Standard Specification for Poly(Vinyl Chloride) (PVC) Pressure-Rated Pipe

ASTM D2464 (2015) Standard Specification for Threaded Poly(Vinyl Chloride) (PVC) Plastic Pipe Fittings, Schedule 80

ASTM D2564 (2012) Standard Specification for Solvent Cements for Poly(Vinyl Chloride) (PVC) Plastic Piping Systems

ASTM D2657 (2007; R 2015) Heat Fusion Joining Polyolefin Pipe and Fittings

ASTM D2774 (2012) Underground Installation of Thermoplastic Pressure Piping

ASTM D3350 (2012) Polyethylene Plastics Pipe and Fittings Materials

ASTM F477 (2014) Standard Specification for Elastomeric Seals (Gaskets) for Joining Plastic Pipe

1.2 DELIVERY, STORAGE, AND HANDLING

Do not damage pipe, fittings and accessories, and pipe coatings during delivery, handling, and storage.

PART 2 PRODUCTS

2.1 PIPE AND FITTINGS

Piping for force mains less than 4 inches in diameter shall be polyvinyl chloride (PVC) plastic or polyethylene (PE) plastic . Piping less than 4 inches in diameter inside pump stations shall be galvanized steel. Pipe

SECTION 33 34 00 Page 2 shall conform to the respective specifications and other requirements specified below.

2.1.1 Plastic Pipe

2.1.1.1 PE Pipe

ASTM D3350 and ASTM D3035 like or similar to EHMW PE 3408 Pipe SDR 11

2.1.1.2 Polypropylene Pipe

ASTM D2122 and ASTM D4101.

2.1.1.3 PVC Pipe

a. PVC Pipe and Fittings Less Than 4 inches Diameter: ASTM D1785, Schedule [80] or ASTM D2241, SDR 21 with screw joints, push-on joints or solvent weld joints. The existing pipe is PVC 1120 Pressure Pipe

SDR-21(200PSI)

2.2 JOINTS

2.2.1 PE Piping

a. Heat Fusion Joints: ASTM D2657.

b. Flanged Joints: ASME B16.1 or AWWA C207.

c. Mechanical Joints: ASME B16.1.

d. Transitions like or similar to Poly-Cam 710 Series

2.2.2 PVC Piping

a. Screw Joint Fittings: ASTM D2464, Schedule 80.

b. Push-On Joint Fittings: ASTM D3139, with ASTM F477gaskets.

c. Solvent Cement: ASTM D2564.

d. Couplings for use with plain end pipe shall have centering rings or stops to ensure the coupling is centered on the joint.

2.3 VALVES

2.3.1 Valves

Valves for buried service shall be non-rising stem (NRS), 2 inch square nut operated with joints applicable to the pipe or installation. Buried valves shall be furnished with extension stems comprising socket, extension stem and operating nut, and shall be of an appropriate length to bring operating nut to within 6 inches of grade.

Plug Valves

Cast iron valves shall comply with AWWA C-517. Valves shall be 100% port eccentric valves compatible for sewer applications. Valves shall be used

SECTION 33 34 00 Page 3 for buried service comprising of a buried worm gear, 2-inch operating nut, extension stem with appropriate length to bring operating nut to within 6 inches of grade, and ground level position indicator assembly. The position indicator shall be installed on an extension stem inside a valve box. The position indicator shall display at a minimum the direction to open and number of turns. The position indicator assembly shall consist of valve box adaptor, an indicator, and an operating stem adaptor."

2.4 VALVE VAULTS

Cast iron vaults shall be the extension type with slide type adjustment and with flared base. The minimum thickness of metal shall be 3/16 inch. The vault length shall be adaptable, without full extension, to the depth of cover over the pipe at the valve locations.

2.5 MISCELLANEOUS MATERIALS

Miscellaneous materials shall comply with the following requirements:

2.5.1 Joint Lubricants

Joint lubricants shall be as recommended by the pipe manufacturer.

2.5.2 Bolts, Nuts and Glands

AWWA C111/A21.11.

PART 3 EXECUTION

3.1 INSTALLATION

Pipe, pipe fittings, and appurtenances shall be installed at the locations indicated. Excavation, trenching, and backfilling shall be as specified in Section 31 00 00 EARTHWORK.

3.1.1 Cutting

Pipe shall be cut in a neat manner with mechanical cutters. Wheel cutters shall be used where practicable. Sharp and rough edges shall be ground smooth and loose material removed from the pipe before laying.

3.1.2 Laying

Except where otherwise authorized, pipe shall be laid with bells facing the direction of laying. Before lowering and while suspended, the pipe shall be inspected for defects. Defective material shall be rejected. Pipe shall be laid in compliance with the following:

d. Polyvinyl Chloride: Manufacturer's instructions.

e. Polyethylene: ASTM D2774.

f. Polypropylene: ASTM D2774.

SECTION 33 34 00 Page 4

3.1.3 Jointing

3.1.3.1 Joints for PE Pipe

Heat fusion joints shall comply with the manufacturer's instructions concerning equipment, temperature, melt time, heat coat, and joining time.

Flanged and mechanical joints shall be made in compliance with the manufacturer's instructions.

3.1.3.2 Joints for PVC Pipe

a. Threaded joints shall be made by wrapping the male threads with joint tape or by applying an approved thread lubricant, then threading the joining members together. The joint shall be tightened with strap wrenches which will not damage the pipe and fittings. The joint shall be tightened no more than 2 threads past hand-tight.

b. Push-on joints: The ends of pipe for push-on joints shall be beveled to facilitate assembly. Pipe shall be marked to indicate when the pipe is fully seated. The gasket shall be lubricated to prevent displacement. The gasket shall remain in proper position in the bell or coupling while the joint is made.

c. Solvent-weld joints shall comply with the manufacturer's instructions.

3.1.4 Installation of Valves

Prior to installation, valves shall be cleaned of all foreign matter and inspected for damage. Valves shall be fully opened and closed to ensure that all parts are properly operating. Valves shall be installed with the stem in the vertical position.

3.1.5 Installation of Valve Boxes

Valve boxes shall be installed over each outside valve, unless otherwise indicated. Valve boxes shall be centered over the valve. Fill shall be carefully tamped around each valve box to a distance of 4 feet on all sides or to undisturbed trench face, if less than 4 feet.

3.2 HYDROSTATIC TESTS

The pipeline shall be subjected to both a pressure test. [The method proposed for disposal of waste water from hydrostatic tests shall be approved by the Contracting Officer.] [Testing is the responsibility of the Contractor.] The test may be witnessed by the Contracting Officer. The Contracting Officer shall be notified in advance of equipment tests.The final test report shall be delivered to the Contracting Officer within 30 days of the test.

SECTION 33 34 00 Page 5

3.2.1 Pressure Test

After the pipe has been installed, joints completed,and the trench has been partially backfilled, leaving the joints exposed for examination, the pipe shall be filled with water to expel all air. The pipeline shall be subjected to a test pressure of 100 psi or 150 percent of the working pressure, whichever is greater, for a period of at least one hour. Each valve shall be opened and closed several times during the test. The exposed pipe, joints, fitting, and valves shall be examined for leaks.

Visible leaks shall be stopped or the defective pipe, fitting, joints, or valve shall be replaced.Leakage Test

The leakage test may be conducted subsequent to or concurrently with the pressure test. The amount of water permitted as leakage for the line shall be placed in a sealed container attached to the supply side of the test pump. No other source of supply will be permitted to be applied to the pump or line under test. The water shall be pumped into the line by the test pump as required to maintain the specified test pressure as described for pressure test for a 2 hour period. Exhaustion of the supply or the inability to maintain the required pressure will be considered test failure. PE pipe can experience diametric expansion and pressure elongation during initial testing. The manufacturer shall be consulted prior to testing for special testing considerations. Allowable leakage shall be determined by the following I-P formula:

L = NDP/K Where:

L = Allowable leakage in gallons per hour.

N = Number of joints in length of pipeline tested.

D = Nominal diameter of the pipe in inches.

P = Square root of the test pressure in psig.

K = 7400 for pipe materials.

At the conclusion of the test, the amount of water remaining in the container shall be measured and the results recorded in the test report.

3.2.2 Retesting

If any deficiencies are revealed during any test, such deficiencies shall be corrected and the tests shall be reconducted until the results of the tests are within specified allowances, without additional cost to the Government.

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SECTION 33 34 00 Page 6