Pipe joints or couplings – With lubrication
Patent
1988-12-29
1991-01-29
Nicholson, Eric K.
Pipe joints or couplings
With lubrication
285334, 285355, F16L 1504
Patent
active
049881272
ABSTRACT:
A power thread comprising a tubing or casing connection having a collar threadably connected to a tubular member at each end is disclosed, utilizing a shallow tapered thread with relatively low crest height. The device has a number of closely mated threads adjacent the inserted end of the tubular member and diminishing but still load bearing engagement of the remaining threads. In one example of a five thread buttress according to the invention, the root to crest dimension of the thread profile is about 0.040" and the thread profile has a taper of about 0.040" per inch. The load flank side of the thread on the tubular member and coupling has about a 3.degree. angle and the stab flank side of the thread has about a 10.degree. angle, relative to a plane perpendicular to the central axis. The crest surface of the threads on the collar and tubular member have a taper of about 1.75.degree. from the approximate midregion of the crest surface to the stab flank. High temperature resistant elastomeric seal rings are disposed in grooves within the coupling and the threaded surface has surface indentations therein for reception of solid particular lubricants.
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