Draft Details

1.1 General

This Standard covers crosslinked polyethylene (PEX) pipe and fittings for use in gas mains and services, including gas gathering, gas transmission, and distribution of fuel gases.

1.2 Pipe

This Standard covers PEX pipes in metric nominal sizes DN 16 to DN 1000 or nominal pipe sizes NPS-3 to NPS-54 that are

pressure-rated using the hydrostatic design basis (HDB) rating method specified in ASTM D2837 or the minimum required strength (MRS) rating method specified in ISO 9080 and ISO 12162;

intended for operating temperatures between –50 and 110 °C; and

joined by PEX electrofusion fittings or by mechanical fittings, but not by butt fusion.

1.3 Joints

This Standard includes requirements for joints made between PEX pipe and PE electrofusion fittings compliant with ASTM F3373.

1.4 Pipe exclusions

This Standard does not cover pipes intended to be joined by butt fusion, socket fusion, or saddle fusion.

1.5 Fittings

Fittings to be used with PEX pipe manufactured to this Standard are in accordance with ASTM F2829. Fittings covered in this Standard include

plastic-to-metal transition fittings;

electrofusion fittings (e.g., couplings, elbows, tees, and end caps); and

mechanical couplings.

1.6 Requirements

This Standard specifies requirements for

primary properties of the PE compound;

physical properties of the finished PEX pipe;

on-line monitoring during production;

shipping and storage; and

markings.

Note: See CSA Z662 for design and installation limitations of products covered by this Standard.