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A. Tapping the pipeline is completed first, coupon retained, temporary valve is closed, the linestop machine is then attached to the valve and the valve is re-opened. The Linestop is hydraulically or mechanically pushed into line to plug the pipe.
B. There are various types of line stopping heads. The type illustrated in the picture on the left can hold pressures ranging from 1000 psi. A single Linestop can be used to temporarily plug and abandon a pipeline.
C. Two or more Linestops can be used in conjunction to isolate and bypass many intersecting lines at once. Fluid in the line is bypassed, leaving a workable dead section, in which, alterations, repairs, or valve additions can be achieved, while service provided by the pipeline is continued.
D. When the mechanical work is completed, and the linestop pipeline pressure is equalized and will be removed. Next, the completion machines are installed onto the temporary valves. An IFT completion plug is installed into the outlet flange of the linestop fitting. This allows the linestop machines and temporary valves to be removed. A blind flange is usually installed to finished the linestop operation.