高压燃气管道试压介质转换的分析与建议  

Analysis and Suggestions for Medium Conversion of High-pressure Gas Pipeline Pressure Test

作　　者：石丹阳 陈赐铭 左怀梦 秦康 SHI Danyang;CHEN Ciming;ZUO Huaimeng;QIN Kang

机构地区：[1]中裕(河南)能源控股有限公司,河南郑州450000

出　　处：《煤气与热力》2024年第5期V0014-V0021,共8页Gas & Heat

摘　　要：GB/T 51455—2023《城镇燃气输配工程施工及验收标准》规定,在采用水为介质做强度试验后,严密性试验介质宜转换为空气或惰性气体。考察国内外其他标准,并无同类要求。通过对其他标准中严密性试验宜(应)采用空气的适用性范围分析,气体严密性试验主要用于厂站管道,且针对非焊接的密封方式。根据工程实践,对比分析典型的试压事故,总结出抛射物体与裂纹扩展2个主要风险。通过理论计算,证明水作为试压介质在抛射物体与裂纹扩展两方面的安全性远高于空气。提出高压燃气管道严密性试验介质宜与强度试验一致采用水,不需要转换介质的建议。According to Standard for Construction and Acceptance of City Gas Transmission and Distribution 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 other domestic and international standards.By analyzing the applicability range of air in the tightness test of other standards,the gas tightness test is mainly used for plant and station pipelines,and for nonwelded sealing methods.According to the engineering practice,the typical pressure test accidents are compared and analyzed,and two main risks of projectile and crack propagation are summarized.Through the theoretical calculations,it is proved that the safety of water as a pressure 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.

关 键 词：高压燃气管道 试压介质转换 强度试验 严密性试验 

分 类 号：TU996.7[建筑科学—供热、供燃气、通风及空调工程]