Crosslinked polyethylene (PEX) piping systems for gas services
This is the second edition of CSA B137.19, Crosslinked polyethylene (PEX) piping systems for gas services. It supersedes the previous edition published in 2017 as Black crosslinked polyethylene (PEX) piping systems for gas services.
This Standard is to be used with the 2020 edition of CSA B137.0, which provides requirements and test methods that are common to some or all of the Standards of the CSA B137 series.
The major changes in this new edition are the following:
a) removal of black from the Standard title and scope;
b) revision of the scope in Clause 1.1;
c) removal of PEX 125 and PEX X009 materials;
d) revision of Clause 4.1.2 from carbon black to colour requirements;
e) revision of UV requirements in Clause 4.1.3;
f) incorporation of Annex C into Clause 18.104.22.168;
g) revision to the sustained pressure requirements in Clause 22.214.171.124; and
h) revision to pipe marking requirements in Clause 7.1.1.
This Standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group.
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.
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
a) 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;
b) intended for operating temperatures between –50 and 110 °C; and
c) joined by electrofusion or by mechanical fittings, but not by butt fusion.
This Standard does not cover pipes intended to be joined by butt fusion, socket fusion, or saddle fusion.
Fittings covered in this Standard include
a) plastic-to-metal transition fittings;
b) electrofusion fittings (e.g., couplings, elbows, tees, and end caps); and
c) mechanical couplings.
This Standard specifies requirements for
a) primary properties of the PE compound;
b) physical properties of the finished PEX pipe;
c) on-line monitoring during production;
d) shipping and storage; and
Note: See CSA Z662 for design and installation limitations of products covered by this Standard.
In this Standard, shall is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Standard; should is used to express a recommendation or that which is advised but not required; and may is used to express an option or that which is permissible within the limits of the Standard.
Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.
Notes to tables and figures are considered part of the table or figure and may be written as requirements.
Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.