PLASTICS PIPING SYSTEMS. INJECTION-MOULDED THERMOPLASTICS FITTINGS FOR ELASTIC SEALING RING TYPE JOINTS FOR PRESSURE PIPING. TEST METHOD FOR RESISTANCE TO A SHORT-TERM INTERNAL PRESSURE WITHOUT END THRUST.
塑料管道系统 压力管道弹性密封环式接头用注射成型热塑性塑料配件 无端推力的短期内压耐受性试验方法