High strength, low torque threaded tubular connection

Details High strength, low torque threaded tubular connection High strength, low torque threaded tubular connection

1992-12-17

1995-06-27

Arola, Dave W.

Pipe joints or couplings

With lubrication

285333, 285334, F16L 702

Patent

active

054274184

ABSTRACT:
A threaded pipe connection as shown in FIGS. 1, 4, 5, 6 or 7, having a thread form such as depicted in FIGS. 8-11, that has: improved sealing; increased resistance to mechanical loads; easy assembly and low makeup torque. Both pin (31) and box (45) may be cut on non-upset pipe ends and result in nearly 100 percent joint efficiency. Tension flank (33) and compression flank (34) may be formed on pin (31) at high flank angles measured from the tubular axis so as to withstand high axial loads without forcing the pin inwardly and the box outwardly, which would tend to separate the mating threads, break the seal and jump threads. Low torque is assured by the complementary forms of pin threads (32) and box threads (42) which confine the thread dope (49) to remain in the root gaps (52) and (54) during assembly.

REFERENCES:
patent: 597000 (1898-01-01), Higbee
patent: 929027 (1909-07-01), Schuhmann
patent: 2183644 (1939-12-01), Frame
patent: 2909380 (1959-10-01), Hoye et al.
patent: 2992613 (1961-07-01), Bodine
patent: 3346278 (1967-10-01), Yocum
patent: 3658368 (1972-04-01), Hokanson
patent: 4004832 (1977-01-01), Connelly

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