Plastics piping systems -- Glass-reinforced thermosetting plastics (GRP) pipes -- Determination of the long-term ultimate bending strain and calculation of the long-term ultimate relative ring deflection, both under wet conditions
塑料管道系统玻璃纤维增强热固性塑料(GRP)管长期极限弯曲应变的测定和潮湿条件下长期极限相对环挠度的计算