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金属管道采用松包塑料薄膜外套(图1)防腐蚀,在国外使用已有二十年,证实这是一种经济而可靠的技术措施。上海石油化工总厂地处上海效区金山卫,该地区土壤腐蚀性强。1982年曾对φ700毫米球墨铸铁管使用高压聚乙烯塑料薄膜作防护,证实它具有施工简便、投资低等优点。现场试验结果表明。管道用聚乙烯膜包缠的部分,管子的表面无凹坑,而未保护部分凹坑的深度达100密耳,埋在潮湿的盐性沼泽土壤中的φ150毫米法兰试件,八年后的结果,也清楚地表明了聚乙
The metal pipe is protected against corrosion by a loose-wrapped plastic film jacket (Fig. 1). It has been used abroad for 20 years and has proved to be an economical and reliable technical measure. Shanghai Petrochemical General Plant is located in Jinshanwei, a Shanghai-based area, where the soil is highly corrosive. In 1982, high-pressure polyethylene plastic film was used for the protection of φ700 mm ductile iron pipes, which proved that it has the advantages of simple construction and low investment. Field test results show. The portion of the pipe wrapped with polyethylene film, the surface of the pipe is free of pits, and the depth of the unprotected portion of the pit is 100 mils. A φ150 mm flange test piece buried in moist saline marsh soil is eight years later. The results also clearly show that Poly