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Line stopping or line plugging is a means of isolating a piping system to provide a shut off where none exists. This process serves as a control, or temporary valve, that can be removed after alterations or valve replacements have been made. With a ''hot tap'' previously made on a line, a line stopper is attached to a temporary valve, and the valve is opened. The line stopper is hydraulically or mechanically pushed into the line to seal the pipe. The main is supported by the line stop sleeve.〔(Municipal Line Stop )〕 After performing the necessary service, the stop is removed, and a blind flange is installed on the sleeve. There are various types of line stopping heads. A single line stop can be used to stop off and abandon a shutdown. Two or more line stops can be used in tandem to isolate and bypass many intersecting lines at once. Fluid in the line is bypassed, leaving a workable dead section to alter, repair or add a valve while service provided by this line is continued. ==References== 〔 (Municipal Line Stopping ) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「line stopping」の詳細全文を読む スポンサード リンク
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