沉降对地下燃气管道阀井内法兰泄漏的影响  

Influence of Settlement on Flange Leakage in Underground Gas Pipeline Valve Well

作　　者：向素平 周阳 高明旭 孙明烨 陆景慧 XIANG Suping;ZHOU Yang;GAO Mingxu;SUN Mingye;LU Jinghui

机构地区：[1]北京市煤气热力工程设计院有限公司,北京100032 [2]北京市燃气集团有限责任公司第四分公司,北京100176

出　　处：《煤气与热力》2024年第5期V0022-V0025,V0040,共5页Gas & Heat

摘　　要：针对城镇燃气管道阀井,提出用当量压力法进行法兰泄漏校核。利用CAESARⅡV2014应力分析软件,计算得出的法兰轴向应力应小于法兰额定压力。以设计压力为1.0 MPa、DN 500 mm的埋地燃气管道阀井为例,从防止法兰泄漏角度,给出管道能承受的最大沉降量的计算方法。针对不同工况,进行影响法兰泄漏因素的分析。计算结果表明,阀井上下游管道沉降量和管段差异沉降率越大,法兰轴向应力越大,法兰泄漏的风险越大。应尽量避免在阀井正下方施工。For urban gas pipeline valve wells,it is proposed to use the equivalent pressure method for flange leakage verification.Using CAESAR II V2014 stress analysis software,the calculated axial stress of the flange should be less than the rated pressure of the flange.Taking the buried gas pipeline valve well with design pressure of 1.0 MPa and DN 500 mm as an example,the calculation method of the maximum settlement that the pipeline can withstand is given from the perspective of preventing flange leakage.According to different working conditions,the factors affecting flange leakage are analyzed.The calculation results indicate that the greater the settlement of the upstream and downstream pipelines of the valve well and the differential settlement rate of the pipeline section,the greater the axial stress of the flange,and the greater the risk of flange leakage.The construction should be avoided directly below the valve well as much as possible.

关 键 词：燃气管道阀井 法兰泄漏 应力校核 管道沉降量 

分 类 号：TU996.7[建筑科学—供热、供燃气、通风及空调工程]