Abstract: Compared with the 3LPE anti-corrosion technology of straight pipe, the present anti-corrosion technology for bend pipe is inferior in the aspects of the mechanization level and anti-corrosion quality. Therefore, the anti-corrosion technology for polyethylene composite tape coating of bend pipe was developed. Its coating structure is in accord with the 3LPE of straight pipe. A composite tape by heating special polyethylene materials with adhesives was made. Then by virtue of mechanical transmission and automatic control, winding the polythylene composite tape around the heated bend pipe, the mechanized operation of bend pipe anti-corrosion was achieved. This technology is a breakthrough in the bend pipe anti-corrosion because it is less in equipment investment, excellent in anticorrosion quality, easy and simple to control and high in producing efficiency. Until now, 1538 bend pipes have been applied practically in the field. It works stably, the anti-corrosion quality and service life of the bend pipe is the same as the straight pipe. This product provides a reliable anti-corrosion means for oil and gas pipeline construction.

Key words: polyethylene composite tape, anti-corrosion, bend pipe, pipeline construction

摘要： 目前的弯管防腐技术,与直管3LPE防腐技术相比,在机械化作业程度和防腐质量上都存在较大差异。为此,开发研究了弯管的聚乙烯复合带外防腐技术及产品,该产品的防腐层结构与直管3LPE一致。生产工艺采用乙烯专用料和胶黏剂热合而成复合带,利用机械传动和自动化控制,采用冷带热缠复合带工艺,实现了弯管防腐的机械化作业。该产品具有设备投资少、防腐质量好、工序简单易于控制、生产效率高等优点,在弯管防腐技术方面取得了突破性进展。产品在现场推广应用1538支,防腐性能稳定,防腐质量与寿命达到与直管3LPE防腐的一致性,为油气管道建设提供了一种可靠的新型防腐手段。

关键词: 聚乙烯复合带, 防腐, 弯管, 管道建设