长呼输气管线的外防腐设计

External Surface Anti-corrosion Desing of Chang-Hu Gas Transmission Pipeline

在天然气长输管线的设计中 ,外腐蚀设计是至关重要的 ,它直接关系到长输管线的运行寿命。在长呼天然气输气管线设计中 ,根据管线的具体情况 ,进行经济、技术的比选 ,选用了煤焦油瓷漆作为管线的主要外防腐层。煤焦油瓷漆防腐性能好、价格合理 ,材料来源广泛 ,涂层厚 ,适用于螺旋焊缝管 ,电绝缘性好 ,吸水性低 ,使用寿命超过 50a.全线共设置 1 0座阴极保护站 ,采用“阴极保护参数在线自动监测系统”

In the design of lon g-distance gas trans mission pipeline,external surface anti-c orrosion design is extremely important,w hich is directly related to pipelines s ervice life.In the design of Chang-Hu gas transmission pipeline,according to c oncrete condition and overall technical and economic comparison,coal tar enamel paint has been adopted.Coal tar enamel p aint is of a good anti-corrosion perform ance,cheap price,many originals,thick co a ting,insulating property,low water perme ability,it is able to ensure its life fo r over 50 years.10 cathodic protection s tations have been set up along the pipel ine.The pipeline is monitored by a autom atic online monitoring system.