Tubular connection with S-thread form for clamping center seal

Details Tubular connection with S-thread form for clamping center seal Tubular connection with S-thread form for clamping center seal

1991-09-18

1992-10-13

Reese, Randolph A.

Pipe joints or couplings

Particular interface

Tapered

285175, 2853323, 285355, 285391, F16L 1500

Patent

active

051544520

ABSTRACT:
A tubular connection employing two separate non-concurrent threaded sections, each of which nearly decays, that is, runs out on a tubular surface, one on the outside diameter of the male tubular member, and one on the inside diameter of the female tubular member, thus providing a joint with nearly the strength of the tubular body in tension without the use of a coupling. The female tubular member is expanded through a cold swaging operation before being finished with the two threaded sections. Additionally, the connection features a torque stop and cylindrical seal in the middle of the two thread steps, where stresses may be kept low. The thread elements are reverse angle locking with S-shaped load flanks which reduce stress concentrations and provide a clamping action on the centralized seal. Because of this unique seal, the connection can take cyclic application of external and internal pressure without leaking, a feat non-coupled and non-upset connections of prior art have not achieved. This invention is a total optimization of tension efficiency, pressure integrity, and low stress compared to all other connections of its genre.

REFERENCES:
patent: 2543100 (1948-12-01), Engh
patent: 4373754 (1983-02-01), Bollfrass et al.
patent: 4377302 (1983-03-01), Kohyama et al.
patent: 4384737 (1983-05-01), Reysser
patent: 4619472 (1986-10-01), Kozono et al.
patent: 4629221 (1986-12-01), Lymsden et al.
patent: 4629224 (1986-12-01), Landriault
patent: 4662659 (1987-05-01), Blose et al.

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