This is the fourth edition of CSA Standard CAN/CSA-31 37.4, Polyethylene Piping Systems for Gas Services. It supersedes the previous editions published in 1971, 1977, and 1986.
The following changes have been made in this edition:
(a) a revised compound chemical resistance test;
(b) the inclusion of P24 compound;
(c) the requirements for both PE XX06 and PE XX08 materials;
(d) the reinsertion of a minimum wall thickness requirement for PE fittings;
(e) the deletion of the former Clause 5.1, Quality Control System;
(f) revised requirements for pressurization during storage to exclude pipe smaller than NPS-3/4;
(g) requirements for marking by the indent print method only;
(h) revised marking size for pipe,-
(i) the inclusion of NPS-8 pipe,-
(j) changes to wall thickness requirements for HP service tubing; and (k) revised coiling parameters.
This Standard was prepared by the Technical Committee on Plastic Pressure Pipe under the jurisdiction of the Standards Steering Committee on Plumbing Products and Materials and was formally approved by these Committees. It has been approved as a National Standard of Canada by the Standards Council of Canada.
This Standard applies to polyethylene pipe, tubing, and fittings for use in gas mains and services, including gathering, transmission, and distribution applications, that carry fuel gases containing not more than 1% aromatic hydrocarbons.
This Standard also applies to all types of fittings and connections used in a plastic gas pipe system including plastic-to-metal transition fittings, plastic component fittings such as elbows, tees, end caps, valves, etc, and clamps and couplings.
Note: Pipe refers to pipe having IPS outside diameters. Tubing refers to pipe having copper tube size outside diameters. In this Standard, where there are test requirements for pipe, they refer to both pipe and tubing.
This Standard establishes the manufacturing and testing requirements necessary to ensure that the polyethylene compound, pipe, and fittings are of a quality acceptable for use in a gas distribution system. This Standard includes requirements for
(a) primary properties of the compound;
(b) physical properties of the finished product;
(c) on-line monitoring during production;
(d) methods of identification; and
(e) shipping and storage.
Note: The user of the pipe, tubing, or fittings should refer to CSA Standard CAN/CSA-Z1 84 for the design and installation limitations on the use of this product.