Tubular connection having two thread sets with multiple intereng

Details Tubular connection having two thread sets with multiple intereng Tubular connection having two thread sets with multiple intereng

1985-04-26

1988-06-28

Arola, Dave W.

Pipe joints or couplings

Particular interface

Tapered

285351, 285355, 411424, F16L 2500

Patent

active

047534605

ABSTRACT:
A tubular connection is disclosed having a small diameter thread set and a large diameter thread set, the small thread set having a lesser number of threads than the large set. A primary torque shoulder is located between the threads sets and a secondary torque shoulder is located behind the large thread set. In the preferred embodiment, the initial partial thread on the pin of both sets and the last partial thread of the small set on the box has a cylindrical root contour, whereas the remainder of the threads are tapered. The longitudinal taper angle of the pin thread sets are dissimilar to the box thread sets, there being a maximum separation of the sets near the center of the connection. Such dissimilar tapering tends to equalize the stress applied to the threads under tension loading. At the center, a seal is provided with hooked threads on either side thereof. The arrangement also provides a torque shoulder at either end of the large thread set. The arrangement provides in a tapered connection having two thread sets of difference diameters, two torque shoulders and two metal-to-metal seal areas.

REFERENCES:
patent: 2239942 (1941-04-01), Stone et al.
patent: 3606403 (1971-09-01), Medney
patent: 4161332 (1979-07-01), Blose
patent: 4398756 (1983-08-01), Duret et al.
patent: 4521042 (1985-06-01), Blackburn et al.
patent: 4537429 (1985-08-01), Landriault
patent: 4549754 (1985-10-01), Saunders

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