stopple

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See: damper, stop
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No hole or future leak path is left at the isolation location by eliminating the need to hot tap and stopple (non-evasive).
Remove unwanted pipeline connections (tees, stopple fittings, illegal taps, etc).
Following the repairs, the stopples would be removed and the pipeline restarted.
Shortly after the shutdown, stopple plugs were installed at the two sites to isolate the respective valves from the rest of the line.