ISO 22391-3:2009 covers a range of service conditions (classes of application), design pressures and pipe dimension classes, and also specifies test parameters and test methods. In conjunction with the other parts of ISO 22391, it is applicable to fittings made of PE-RT, as well as to those made of other materials, intended to be fitted to pipes conforming to ISO 22391-2 for hot and cold water installations, the joints of which are in accordance with ISO 22391-5.
It is applicable to the following types of fitting:
- mechanical fittings;
- socket fusion fitting;
- electrofusion fittings;
- fittings with incorporated inserts.