天然气分输站场带冷凝水管道的防腐

Corrosion control on the pipeline contained condensation water in natural gas offtake station

使用粘弹体防腐材料解决天然气长输管道分输站场调压橇后管道聚结冷凝水引起的腐蚀问题,防腐层由粘弹体防腐胶带和PVC外保护带组成。施工过程包括4个步骤:管体表面处理、缠绕粘弹体防腐胶带、缠绕外保护胶带和质量检查。粘弹体防腐胶带端部与原涂层的搭接长度不小于50mm,接头部位的最小搭接长度为10mm,缠绕时不必保持较大张力;外保护胶带接头部位的搭接量为50%,缠绕时要保持一定张力。在西气东输管道滁州和长铝等分输站场应用该技术,取得了显著的防腐效果。

To control the condensation water corrosion for the pipeline behind pressure regulation skid in gas offtake station,a visco-elastic anticorrosion materials was used. The anticorrosion layer was consisted of the visco-elastic anticorrosion tape and PVC outer tape. Installation process was divided into four steps: surface preparation of pipe,wrapping visco-elastic anticorrosive tape,wrapping protective outer tape and quality inspection. The overlap length between the front end of visco-elastic anticorrosion tape and the end of original coating was not less than 50 mm. The minimum overlap length of visco-elastic wrapping tape was 10 mm. It was not necessary to maintain bigger tension when the visco-elastic anticorrosoion tape was wrapped. The overlap width at joint of the outer tape was 50%,but a certain tension was necessary when wrapping. This anticorrosion technology was adopted in Chuzhou and Changlv Gas Offtake Stations in West-to-East Gas Transmission Pipeline with remarkable anticorrosion effectiveness.