Pipes and tubular conduits – With closures and plugs – Test plugs
Patent
1977-11-07
1979-08-07
Footland, Lenard A.
Pipes and tubular conduits
With closures and plugs
Test plugs
277113, F16L 5512
Patent
active
041634624
ABSTRACT:
A test plug for sealing an internal passageway of a vessel preparatory to pressure testing the vessel with a fluid. The test plug is particularly designed for use with vessels that are installed below ground level, and is of the type that can be actuated from ground level to provide the desired sealing function. When the plug is intended to seal an internally threaded passageway of the vessel, it includes an externally threaded seal plate that is rotated into threaded engagement with the internal threads by an upstanding stem that is secured to the seal plate for operation from ground level. The seal plate carries an annular compressible gasket adjacent its lower surface, and a squeeze plate is positioned beneath the gasket for movement in an upward direction to compress the gasket against the lower surface of the seal plate. The gasket compression causes lateral expansion of the gasket into sealing engagement with the internal wall of the vessel passageway. In order to move the squeeze plate in an upward direction towards the seal plate, it is connected to an actuating rod that extends upwardly through a passage in the seal plate so that it also is responsive to operation from ground level.
REFERENCES:
patent: 595189 (1897-12-01), Mern
patent: 1808411 (1931-06-01), Hinkston
patent: 3326243 (1967-06-01), Augustus
patent: 3704729 (1972-12-01), Tomlinson
Footland Lenard A.
Universal Valve Co. Inc.
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