ANQING GREAT WALL PIPELINE CO.,LTD ANQING GREAT WALL PIPELINE CO.,LTD

Introduction about Line Stops

What is a Line Stop ?
 
Line Stops (sometimes called Stopples) start with a hot tap, but are intended to stop the flow in the pipe. 
Line Stops are of necessity, somewhat more complicated than normal hot taps, but they start out in much the same way.  A fitting is attached to the pipe, a hot tap is performed as previously detailed.  Once the hot tap has been completed, the valve is closed, then another machine, known as a line stop actuator is installed on the pipe.  The line stop actuator is used to insert a plugging head into the pipe, the most common type being a pivot head mechanism.  Line stops are used to replace valves, fittings, and other equipment, once the job is done, pressure is equalized, and the line stop head is removed.  The Line Stop Fitting has a specially modified flange, which includes a special plug, that allows for removal of the valve.  There are several different designs for these flanges, but they all work pretty much the same, the plug is inserted into the flange through the valve, it is securely locked in place, with the result that the pressure can be bled off of the housing and valve, the valve can then be removed, and the flange blinded off.  
 

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