Device for plugging pipes when performing hydrostatic tests

摘要

Device for use at hydrostatic testing of pipes in a pipe line system for liquids or gases or any other provisional sealing of a pipe end comprising a stem (8), a plug stop (5) with an inner tapering (5a) and an outer support ring (5b), through which the stem (8) passes, an eccentric handle (1), pivotally connected to the stem (8), whereby an expansion sleeve (6) having a cutting ring (6a) is arranged between the stem and the plug stop (5), and an O-shaped ring (7) provided between the expansion sleeve (6) and the stem, whereby the expansion sleeve (6) at lowering of the eccentric handle (1) is made to expand against the inner tapering (5a) of the plug top (5), while the O-shaped ring (7) has been compressed before that, whereby the expansion sleeve is brought forward and its edge (6a) is pressed outwards and engages with the inside of the pipe. The stem (8) has a stop cleat (8a) for cooperation with the rear end of the expansion sleeve (6) for limiting the compression of the O-shaped ring with the aid of a clearance (8b), which exists between the expansion sleeve and the stop cleat (8a) of the stem. Further, a locking pin (9) is arranged to pass through a boring in the stem (8) and through two mutually aligned holes in the expansion sleeve (6) with such a diameter in relation to the locking pin that a movement is allowed for compressing the O-shaped ring (7), and in that the pin (9), which is mounted in the stem (8), when the eccentric handle (1) in upraised position is pushed inwardly towards the pipe, pushes the expansion sleeve (6) backwards to the initial position and disengages the sleeve in case the edges (6a) have got stuck in the pipe.