THERMOPLASTICS PIPING SYSTEMS. NON-END-LOAD-BEARING ELASTOMERIC SEALING RING TYPE JOINTS BETWEEN PRESSURE PIPES AND MOULDED FITTINGS. TEST METHOD FOR LEAKTIGHTNESS UNDER INTERNAL HYDROSTATIC PRESSURE WITHOUT END THRUST.
热塑性塑料管道系统 压力管道和模制配件之间的非端部承载弹性密封圈型接头 无端推力的内部静水压力下密封性试验方法