高压燃气管道试压介质转换的分析与建议OA

According to Standard for Construc-tion and Acceptance of City Gas Transmission and Dis-tribution Works(GB/T 51455-2023),after conducting strength tests using water as the medium,the tightness test medium should be converted to air or inert gas.There are no similar requirements when examining oth-er domestic and international standards.By analyzing the applicability range of air in the tightness test of oth-er standards,the gas tightness test is mainly used for plant and station pipelines,and for non-welded sealing methods.According to the engineering practice,the typical pressure test accidents are compared and ana-lyzed,and two main risks of projectile and crack propa-gation are summarized.Through the theoretical calcu-lations,it is proved that the safety of water as a pres-sure test medium is much higher than that of air in both projectile and crack propagation.It is suggested that the medium used for the tightness test of high-pressure gas pipelines should be consistent with the strength test using water,without the need for medium conversion.