Preface
This is the first edition of CSA Standard CAN/CSA-B137.5, Crosslinked Polyethylene (PEX) Tubing Systems for Pressure Applications. Cross-linked polyethylene tubing has been widely used in Europe since the mid 19705 for hot and cold water distribution systems. National Standards are published for the material in many countries around the world.
Noteworthy are the test requirements for
(a) environmental stress cracking (Clause 4.5);
(b) degree of cross linking (Clause 4.6);
(c) stabilizer migration resistance (Clause 4.7);
(d) bent-tube hydrostatic sustained pressure strength
(Clause 4. 8); and
(e) excessive temperature pressure capability (Clause 4. 9).
This Standard was prepared by the Technical Committee on Plastic Pipe and the Subcommittee on 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.
Scope
1.1
This Standard covers cross—linked polyethylene pressure tubing systems in sizes NPS 1/4 through 2. Components are made in one standard dimension ratio (SDR 9) and are intended for use in potable water distribution systems at a maximum working temperature of 82° C and 0.69 MPa (100 psi).
Note: Pressure rating for water at 23° C and 93° C is given in Appendix A.
1.2
The components covered by this Standard are intended for use in residential and commercial hot and cold potable water distribution systems, as well as sealed central heating (including under-floor) systems.
Note: This Standard may involve hazardous materials, operations, and equipment. This Standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of-this Standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.