Apparatus and method for connecting two axially spaced apart pip

Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator

Patent

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Details

61 721, 61 723, 166 5, 166 6, 285DIG23, F16L 104

Patent

active

039316700

ABSTRACT:
A releasable pull plug arranged for mounting inside the end of one of the pipes or conduits with the plug having clips for disengageably engaging the internal surface of one of the conduits and locking the plug against axial movement relative thereto. A line is attached to the plug and extends axially through the other conduit for exerting a pulling force thereon whereby the two conduits may be drawn together by pulling on the line. The plug is provided with fluid pressure actuated release means for disengaging the clips, and means are provided for applying pressurized fluid to the release means to thereby release the plug. Means are also provided which are operable in response to the activation of the release means for holding the locking means in the disengaged position independently of the fluid pressure, whereby the plug after release may be withdrawn through the other conduit by pulling on the line. The plug may include means for sealing the end of the conduit in which the plug is mounted.
The method includes the steps of installing a releasable pull plug inside the end of one of the conduits, with the plug being arranged to release in response to application of fluid pressure thereto. A line is attached to the plug and is extended through the other conduit. Thereafter, a tension force is applied to the line to draw the two pipe ends together, after which a fluid pressure is applied to the plug to thereby release the plug. The fluid pressure is relieved, and the released plug is then withdrawn from the conduits by pulling on the line.

REFERENCES:
patent: 3383122 (1968-05-01), Richardson
patent: 3645563 (1972-02-01), Rochelle
patent: 3729941 (1973-05-01), Rochelle
patent: 3751932 (1973-08-01), Matthews
patent: 3830509 (1974-08-01), Weber
patent: 3835655 (1974-09-01), Oliver
patent: 3842612 (1974-10-01), Arnold

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