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Line Stopping

Source: 未知 Posted:2014-02-25 21:30 Views:

Line Stops, sometimes called Stoppling or line plugging 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 stopple fitting(3-way tee for suspended type, 4-way tee for cylinder type) is attached to the pipe, a hot tap is performed as previously detailed. Once the hot tap has been completed, the wafer valve(SANDWICH is a trademark of TD Williamson Company)is closed, then another machine, known as a line stop machine(plugging machine)is installed on the pipe.

The line stop machine is used to insert a plugging head ( or expanding sleeve in cylinder stopple type, sealing element in suspended stopple type) 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 (or expanding sleeve in cylinder type) 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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DRILLING & TAPPING
PLUGGING MACHINES
SEALING ELEMENT
EXPANDING SLEEVES
CUTTERS
FITTINGS
WAFER VALVE
HYDRAULIC PUMP
PIPE CUTTING
COMPLETION PLUG
Repairing welding fixture

Case

Pipeline reroute project at Xi Hua village, Nanan City

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