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首页> 外文会议>Pipeline Division Specialty Conference; 20050821-24; Houston,TX(US) >Weld-After-Backfill, A Growing Industry Practice
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Weld-After-Backfill, A Growing Industry Practice

机译：回焊后回填，一种不断发展的行业惯例

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This study documents a series of eight trials of the weld-after backfill (W-A-B) sequence. This sequence of pipeline construction was first used in the late 1980's on a pipeline in Texas. Since then, more than 45 major pipeline projects in the United States have been constructed using W-A-B. These projects included a variety of pipe joint coating materials such as mortar diapers, concrete encasement, tape coatings and heat-shrinkable sleeves. This study focuses on heat-shrinkable sleeves for coating the pipe joint, prior to backfill. A growing practice in steel water pipeline construction entails fitting bell & spigot pipe segments together, installing field joint coatings and backfilling the pipe prior to welding. Welding is then completed from the inside of the pipe after the pipe has been backfilled. Weld-after-backfill has proven to be successful in minimizing the length of open trench, improving project safety and speeding up pipeline laying, resulting in design, economic and safety advantages over traditional steel water pipeline construction methods. These advantages benefit the owner, designer, contractors and suppliers. W-A-B is recommended for projects with lap welded joints, which is the predominant joint design for most water pipeline installations. The welding process, however, produces high temperatures on the pipe wall, which may damage some corrosion coatings. Research by Northwest Pipe, National Welding and Canusa-CPS was completed to evaluate various welding processes, measure temperatures and assess the affects of the W-A-B sequence on exterior field joint coatings. Various heat-shrinkable sleeve-coating systems were tested in order to optimize current practices. This paper describes the W-A-B sequence, explains typical installation and welding processes, provides data from the research and makes recommendations as to best practices when this construction method is used.
机译：这项研究记录了一系列的八次试后焊回填（W-A-B）序列的试验。这种管道建造的顺序最早是在1980年代后期在德克萨斯州的一条管道上使用的。自那时以来，美国已经使用W-A-B建造了超过45个大型管道项目。这些项目包括各种管接头涂料，例如砂浆尿布，混凝土外包装，胶带涂料和热缩套管。这项研究的重点是在回填之前，可热收缩的套管用于涂覆管接头。钢制水管道建设中越来越多的实践要求将钟形和水龙头管段装配在一起，安装现场接头涂层并在焊接前回填管道。管道回填后，可从管道内部完成焊接。事实证明，回填后补焊成功地减少了露天沟渠的长度，提高了工程安全性并加快了管道铺设的速度，与传统的钢水管道施工方法相比，在设计，经济和安全方面均具有优势。这些优势使所有者，设计师，承包商和供应商受益。建议将W-A-B用于搭接接头的项目，这是大多数输水管道安装的主要接头设计。但是，焊接过程会在管壁上产生高温，这可能会损坏一些腐蚀涂层。由西北管道，美国国家焊接公司和Canusa-CPS完成的研究旨在评估各种焊接工艺，测量温度并评估W-A-B顺序对外部现场接头涂层的影响。为了优化当前的实践，已经测试了各种热缩套管涂布系统。本文介绍了W-A-B的顺序，说明了典型的安装和焊接过程，提供了研究数据，并就使用这种施工方法时的最佳实践提出了建议。

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