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Weld-After-Backfill, A Growing Industry Practice

机译：焊接后回填，不断增长的行业实践

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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：本研究记录了一系列焊接回填（W-A-B）序列的八种试验。这种管道建设序列首先在德克萨斯州的一条管道上使用。从那时起，美国在美国的45个主要管道项目已经使用W-A-B构建。这些项目包括各种管道接头涂料，如砂浆尿布，混凝土封装，胶带涂料和可热收缩套管。本研究专注于在回填之前用于涂覆管接头的热收缩套筒。钢水管道建设的越来越多的练习需要将贝尔和钢管管段配合在一起，安装现场联合涂层并在焊接之前回填管。然后从管道回填后从管道内部完成焊接。焊接后回填已被证明可以取得成功，以最大限度地减少开放式沟槽的长度，提高项目安全和加速管道铺设，导致传统钢水管道施工方法的设计，经济和安全优势。这些优势使所有者，设计师，承包商和供应商受益。建议使用LAP焊接接头的项目W-A-B，这是大多数水管道安装的主要联合设计。然而，焊接过程在管壁上产生高温，这可能会损坏一些腐蚀涂层。基于西北管道，国家焊接和甘蓝CPS的研究完成以评估各种焊接工艺，测量温度，并评估W-A-B序列对外部磁场关节涂层的影响。测试各种可热收缩套筒涂层系统以优化电流实践。本文介绍了W-A-B序列，解释了典型的安装和焊接过程，提供来自研究的数据，并在使用这种施工方法时提出最佳实践。

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