IAPMO IS 31 2022 Installation Standard for PEX Tubing Systems for Hot- and Cold-
IAPMO IS 31-22 Installation Standard for PEX Tubing Systems for Hot- and Cold-Water Distribution
1.1.1 This Standard specifies requirements for the installation of SDR 9 CTS crosslinked polyethylene (PEX) tubing and fittings, including cold‐expansion, crimp, press, and mechanical compression fittings, intended for hot‐ and cold‐water distribution systems within buildings.
1.1.2 This Standards applies to
(a) SDR 9 CTS PEX tubing complying with ASTM F876 and pressure‐rated in accordance with
PPI TR‐3; and
(b) PEX fitting systems complying with
(i) ASTM F877, for mechanical compression fittings and metal or plastic insert fittings with
stainless steel press sleeves;
(ii) ASTM F1807 or ASTM F2159, for metal or plastic insert fittings with copper crimp rings;
(iii) ASTM F1960, for cold expansion fittings with PEX reinforced rings; or
(iv) ASTM F2080, for cold expansion fittings with metal compression sleeves.