JIS K 7031:1998 Plastics piping systems -- Glass-reinforced thermosetting plastics (GRP) pipe and fitting -- Test methods to prove the leaktightness of the wall under short-term internal pressure
2003JIS K 7031:2003 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
1998JIS K 7031:1998 Plastics piping systems -- Glass-reinforced thermosetting plastics (GRP) pipe and fitting -- Test methods to prove the leaktightness of the wall under short-term internal pressure