Flange system for pipeline plugging

摘要

A flange system for locking a plug in a pipeline flange. The flange system includes a flange with an axial passage for receiving a pipeline plug with a first annular groove. At least one radial passage for receiving a locking means and at least one locking means for engaging the first annular groove for locking the plug in place within the flange. Each such locking means is carried in a radial passage in the flange, the radial passage including a threaded driver bore and an unthreaded pin bore. Each such locking means includes a driver threadedly carried in the driver bore and a pin attached to the driver and carried in the pin bore. The locking means may include an arcuate locking collar carried by the pin, such that rotation of the driver causes the locking collar to be inserted into or retracted from the first annular groove of the plug, for locking and unlocking the plug in the flange.