SECTION 15024 DETAIL PIPING SPECIFICATION – POLYETHYLENE PIPE AND FITTINGS

This spec was part of the Des Plaines, IL River WRF project that bid Feb 26, 2015.


SECTION 15024

DETAIL PIPING SPECIFICATION – POLYETHYLENE PIPE AND FITTINGS


PART 1 GENERAL

1.1 SECTION INCLUDES

A. Polyethylene pipe and fittings.

1.2 RELATED SECTION

A. Section 15000 - Plant Piping - General: See referenced Section for additional requirements.

1.3 SUBMITTALS

A. As specified in Section 15000.


PART 2 PRODUCTS

2.1 PIPE

A. General Service:  High density; high molecular weight black polyethylene, with a PPI rating of PE3408, conforming to ASTM D1248, ASTM D2104, and ASTM D3350.

B. Gas Service: High density; high molecular weight federal safety yellow polyethylene, with a PPI rating of PE3408, conforming to ASTM D1248, ASTM D2104, and ASTM D3350.

2.2 JOINTS

A. Fusion bonded per ASTM D3261 and manufacturers recommendations.

2.3 FITTINGS

A. Molded, SDR11, fusion bonded meeting requirements of ASTM D2513 and ASTM D3261.

2.4 TRANSITION FITTINGS

A. Transition fittings for connection between polyethylene and stainless steel piping shall be fusion bonded to the polyethylene pipe and threaded or flanged fusion bonded to the polyethylene pipe and threaded or flanged for connection to the stainless steel pipe.

PART 3 EXECUTION

3.1 INSTALLATION

A. General:
1. All polyethylene pipe shall be cut, made up, and installed in accordance with the pipe manufacturer's recommendations.
2. Pipe shall be laid by snaking the pipe from one side of the trench to the other. Offset shall be as recommended by the manufacturer for the maximum temperature variation between installation and the process.
3. Provide metallic marking tape over all buried polyethylene pipe as specified in Section 15000.

3.2 CUTTING PIPE

A. Cut pipe with milling type cutter, rolling pipe cutter, or abrasive saw cutter. Do not flame cut.

3.3 DRESSING CUT ENDS

A. Dress cut ends of pipe in accordance with the type of joint to be made.

3.4 FABRICATION OF FLANGED PIPE

A. Flanged pipe shall be fabricated in the shop, not in the field, and delivered to the jobsite with flanges in place and properly faced. Threaded flanges shall be individually fitted and machine tightened on matching threaded pipe by the manufacturer.

B. Flanges shall be faced after fabrication in accordance with ANSI A21.15/AWWA C115. Flange-to-pipe threaded joints shall be hydrostatically shop tested to ensure joint integrity.

3.5 JOINTING PIPE

A. Flanged:  Before connecting flanged pipe, the faces of the flanges shall be thoroughly cleaned of all oil, grease, and foreign material. The rubber gaskets shall be checked for proper fit and thoroughly cleaned. Care shall be taken to assure proper seating of the flange gasket.  Bolts shall be tightened so that the pressure on the gasket is uniform. Torque-limiting wrenches shall be used to ensure uniform bearing insofar as possible.  If joints leak when the hydrostatic test is applied, the gaskets shall be removed and reset and bolts tightened.

3.6 TESTING

A. All lines shall be tested as listed in the Pipe Schedule shown on the Drawings. Test procedures shall be as specified in Section 15000.

3.7 SUPPORTS AND HANGERS

A. As specified in Section 15000.

END OF SECTION