Importance

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Abstract

An interference fit pipe coupling has threaded sections inside each end portion which grip the outer walls of a plain end pipe that is forced axially thereinto. An outer, longer section of the threads are tapered Buttress-like threads that are formed on a helix, and a shorter inner section of the threads also are Buttress-like but are circumferential. A smooth cylindrical conformance bore is formed at the outer end of the threads and has an inner diameter that is less than the nominal are of the plain end pipe to reduce ovality thereof and prestress same for entry into the threads. When the plain end portion of a pipe is forced axially into the coupling, the outer threads grip the pipe end portion to provide a rigid connection, and the circumferential threads grip the pipe end portions at axially spaced points to provide metal-to-metal seals. An elastomer, plastic or other suitable material seal ring that is engaged by the opposing end faces of the pipe end portions provides a redundant or back-up fluid seal.

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First Claim