BS EN 911:1996 塑料管道系统.热塑塑料压力管道用的弹性密封环型接头和机械接头.外部流体静压条件下防漏密封试验方法
Plastics piping systems - Elastomeric sealing ring type joints and mechanical joints for thermoplastics pressure piping - Test method for leaktightness under external hydrostatic pressure