Evaluation Method of Head Loss in a Pipe with Internal Leaking Preventive Joint Bands

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  • 複数の止水バンド施工による損失水頭の評価方法
  • フクスウ ノ シスイ バンド セコウ ニ ヨル ソンシツスイトウ ノ ヒョウカ ホウホウ

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Abstract

<p>As an emergency measure in a sudden pipeline leak accident, an internal leaking preventive joint band is installed on a target section’s pipe joint. This band is often used alone; however, sometimes bands are arranged in series on a pipe for preventive maintenance. Although continuous installation of bands may cause a large head loss, a method of evaluating this head loss has yet to be established. This study investigated the optimum evaluation methods of head loss with arranging some bands in series and using it alone by hydraulic model experiments using the band of 3-mm thick. Our results found that head loss caused by arranging bands in a series can be calculated by adding the head loss of each band by the number of installation points, and the ordinary method―the formula for sudden contraction and expansion overestimates the band’s loss factor.</p>

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