ČSN EN ISO 3459
Plastové potrubní systémy - Mechanické spoje mezi tvarovkami a tlakovými trubkami - Stanovení těsnosti za podtlaku

ČSN EN ISO 3459

This document specifies two methods of testing for checking the leaktightness of assembled joints between mechanical fittings and plastic pressure pipes with diameters up to and including 63 mm. The test applies regardless of the design and material of the fitting used for jointing plastics pipe.
This test method is not applicable to fusion-welded joints.