埋地钢质管道防腐问题

阐述了埋地钢质管道发生腐蚀的四个影响因素，即环境、腐蚀防护效果、钢管材质和制造工艺以及应力水平，统计了１９９０～１９９５年石油沥青、煤焦油瓷漆、挤塑聚乙烯、ＰＥ胶带、ＦＢＥ、复合覆盖层的涂敷量，指出防腐覆盖层各有优缺点，应根据管道的地质条件、腐蚀环境等而定，目前应建立防腐层的综合评价方法以解决防腐覆盖层的设计问题，同时还应对钢管表面处理、现场补口加以重视，在采用亲高强薄壁钢材时应考虑壁厚要求。

Corrosion Control of Buried Steel Pipeline

The paper describes in detail the four factors resulting in the corrosion of buried steel pipeline.that is environment,corrosion control effectiveness,material of pipe steel, and stress of pipeline,presents a total statistics on petroleum asphalt, coal-tar enemal,extruded polyethylene coating, PE tape, FBE, and multiple coating system and the individual percentage of theirs per years during 1990-1995,and points out that the selection of all kinds of coatings,being different behaviors,should be defermined according to the geological conditions and corrosive environments along pipeline route. Meanwhile,to solve the problems on coating design,the comprehensive evaluation method,like factor weighted mean method,should be established. The surface preparation and field coating for welded joint should be put stress on and the wall thickness requirements should be considered where the high-strength thin-wall pipe is used.