![]() ![]() Air pressure testing is recommended over water for practical reasons and due to difficulties arising from water freezing during winter months. ![]() Pressure testing requirements and procedures should be in compliance with local codes and PEX manufacturer’s instructions.Maximum working pressure indicates highest anticipated operating pressure.Pressure testing - Hot & Cold Water Plumbingģ times the maximum working pressure or a minimum of 40 psi, but no greater than 100 psi.ĭuration: 30 minutes minimum, 2 hours recommendedġ.5 times the maximum working pressure but no greater than pipe’s pressure rating at given temperature. Pressure testing - Hydronic & Radiant Heating Pressure ratings, testing and pressure drop PEX Tubing Pressure Ratings Exceptions are nominal sizes 1/2" and below. PEX made to US standards must comply with a SDR-9 (Standard Dimension Ratio), which is the ratio of OD (Outside Diameter) to pipe wall thickness (9:1).This is why push fittings can be used with all of these pipes. OD of PEX, copper and CPVC pipe with the same size (CTS) is the same.PEX tubing sizes are denoted by CTS (copper tubing size), not OD (Outside Diameter) or ID (Inside Diameter).Same data applies both to oxygen barrier and non-barrier PEX. Dimensional data is subject to manufacturing tolerances and may vary by brand. * Numbers are approximate as per ASTM requirements. ![]()
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