Threaded connection for pipes and method of fabricating same

Details Threaded connection for pipes and method of fabricating same Threaded connection for pipes and method of fabricating same

1987-09-28

1989-01-10

Callaghan, Thomas F.

Pipe joints or couplings

Particular interface

Tapered

285390, F16L 1500

Patent

active

047969288

ABSTRACT:
The method of fabricating threaded pipe joints to eliminate variations in tensile strength produced by tolerance variations in the wall thickness of a pipe. Such tolerance variations are eliminated by cold forming and then machining the entire lengths of both the pin and box ends of the threaded pipe joint. A precise mathematical relationship between the root diameter of the threads and the wall thicknesses of the pin and box portions of the pipe eliminates the creation of critical areas having reduced tensile strength.

REFERENCES:
patent: 4253687 (1981-03-01), Maples
patent: 4373754 (1983-02-01), Bollfrass et al.
patent: 4521042 (1985-06-01), Blackburn et al.
patent: 4570982 (1986-02-01), Blose et al.
patent: 4624488 (1986-11-01), Furgerson
patent: 4662659 (1987-05-01), Blose et al.
patent: 4671544 (1987-06-01), Ortloff
patent: 4688832 (1987-08-01), Ortloff et al.
patent: 4703954 (1987-11-01), Ortloff et al.
patent: 4753460 (1988-06-01), Tung
Hydril Tubular Products Division Catalogue Sheet, date not known, showing Hydril Mac Casing Connection.
Hughes/Anchor NJO Premium Casing Connections Catalogue Sheet, date not known, showing NJD Connection.
Baker Tubular Services, Inc., Catalog, p. 6, showing RSS Threaded Connection, Feb. 1986.

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