Pipe joints or couplings – Particular interface – Tapered
Patent
1998-03-19
2000-09-26
Nicholson, Eric K.
Pipe joints or couplings
Particular interface
Tapered
F16L 2500
Patent
active
061233684
ABSTRACT:
A threaded pipe connection is disclosed that includes a box member and a pin member. The box member has a tapered, internal, generally dovetail-shaped thread incorporated in a two-step wedge configuration such that there exists a smaller step and a larger step each with stab flanks, load flanks, roots, and crests. The internal thread has a beginning and an end and increases in width in one direction. The pin member also has a tapered, external, generally dovetail-shaped thread incorporated in a two-step wedge configuration such that there exists a smaller step and a larger step each with stab flanks load flanks, roots, and crests. The external thread increases in width in the other direction so that the complementary flanks of the respective threads move into engagement during rotational make-up of the connection and form sealing surfaces that resist the flow of fluids between the threads on the smaller step of the box member and the smaller step of the pin member upon rotational make-up of the connection, while leaving clearance between the threads on the larger step of the box member and the larger step of the pin member upon rotational make-up of the connection.
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Hydril Company
Nicholson Eric K.
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