NP EN 1229-2001 Plastics piping systems Glass-reinforced thermosetting plastics(GRP) pipes and fittings Test methods to prove the leaktightness of the wall under short-term internal pressure
2002NP EN 1229-2001 Plastics piping systems Glass-reinforced thermosetting plastics(GRP) pipes and fittings Test methods to prove the leaktightness of the wall under short-term internal pressure