Thermoplastics piping systems - joints for buried non - pressure sewerage applications - test method for long - term sealing performance of joints with thermoplastic elastomer seals by estimating the sealing pressure 热塑管道系统.地下埋装的非承压污水设施用连接件.通过对密封压力的估计对带热塑弹力密封件的连接件的长期密封性能的试验方法