scope:

This part of ISO 22621 specifies the physical and mechanical characteristics of fittings made from polyamide in accordance with Part 1 of this International Standard, intended to be used for the supply of gaseous fuels for maximum operating pressure up to and including 20 bar1) and to be buried. It also specifies the test parameters for the test methods referred to this part of ISO 22621. This part of ISO 22621 also lays down requirements for dimensions and the marking of fittings. In conjunction with other Parts of ISO 22621 it is applicable to PA fittings, their joints and to joints with components of PA and to joints with mechanical fittings of other materials. In conjunction with other parts of ISO 22621, it is applicable to PA fittings, their joints, joints with components of PA and joints with mechanical fittings with other materials. These fittings can be of the following types: . fusion fittings: electrofusion fittings; butt fusion fittings. . transition fittings.