Pipe joints or couplings – With casing – lining or protector – Lined
Patent
1995-02-16
1996-11-12
Tsay, Frank
Pipe joints or couplings
With casing, lining or protector
Lined
285236, 138109, F16L 914
Patent
active
055732828
ABSTRACT:
A flanged joint assembly for a lined pipeline having a plastic liner and in which the joint is sealed by compression of mating plastic flanges between mating steel flanges and in which plastic flange portions are differentially compressible. Each plastic flange is constructed with a flat sealing face and a thickened outer edge portion in the form of an annular disk. In the assembled joint, compression of the plastic flange is essentially restricted to this thickened flange portion by controlling the size of one of several recesses machined into the face of the steel flange face to accommodate portions of the plastic flanges. A thickened inner annular portion of the circular plastic flange is formed to create a concave frusto-conical surface having its larger circular cross section spaced axially away from the flat sealing face. The concave surface of the plastic flange mates with a corresponding convex frusto-conical surface of another recess machined into the face the respective steel flange thereby creating a wedging or camming effect to prevent radial inward movement of the plastic liner. The structure minimizes distortion of the smooth inner cylindrical surface of the plastic pipe liner at the joint interface which may otherwise occur due to cold flow, creep or displacement of the plastic material. The joint thereby minimizes turbulence of flow within tile pipeline and reduces wear from abrasion which may occur during pipeline transport of abrasive slurry mixtures.
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Egner Randall H.
Kneller Dale A.
Freudenberg Kenton L.
Freudenberg Maxwell C.
Tsay Frank
United Pipeline System, USA, Inc.
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