Pipe joints or couplings – Particular interface
Patent
1994-07-14
1995-11-21
Arola, Dave W.
Pipe joints or couplings
Particular interface
285334, 2853344, 285917, F16L 2500
Patent
active
054680298
ABSTRACT:
A pipe coupling or connection comprises a female coupling component and a mating male coupling component. Each component is matingly threaded for coupling engagement, and each is provided with an adjacent frusto-conical sealing surface. The sealing surface is provided with a controlled surface roughness, viz. very shallow fine surface variations, preferably formed as microgrooves at a pitch small relative to the pitch of the threads. The slope of the frusto-conical surface of the sealing surface of the male component is slightly mismatched with that of the sealing surface of the female component to simulate the bearing force vs. axial distance characteristic of shrunk-fit circular cylindrical sealing surfaces. The mismatch enables the sealing pressure to be above a design minimum throughout the entire sealing area yet higher at each end of the sealing area. As the coupling is assembled, thread interference in the vicinity of the sealing surface lags the occurrence of interference between the sealing surfaces. Load threads are provided with negatively inclined load flank faces. The slope of the load thread pitch line of the male element is slightly steeper than the slope of the load thread pitch line of the female element. Load thread interference values and tolerances are selected to enable the shrunk-fit cylindrical sealing surface simulation to be met over the range of tolerances provided. The envelope of the range of curves of interference vs. distance along the effective pin sealing surface area has a positive slope. The effective sealing area is at least about one-third and preferably at least about half of the available sealing area.
REFERENCES:
patent: Re30647 (1994-07-01), Blose
patent: 1875708 (1932-09-01), Couhig
patent: 2818343 (1934-11-01), Reimschissel
patent: 2893759 (1959-07-01), Blose
patent: 3224799 (1965-12-01), Blose
patent: 4192533 (1980-03-01), Blose
patent: 4600224 (1986-07-01), Blose
patent: 4736967 (1988-04-01), Mott et al.
patent: 4830411 (1989-05-01), Tsuru
patent: 5007665 (1991-04-01), Bovisio et al.
patent: 5330239 (1994-07-01), Blose et al.
patent: 5348350 (1994-09-01), Blose et al.
Slack et al., Investigation of a Premium Casing Connection for Canadian Thermal Recovery Wells, (May 2, 1988).
Blose Thomas L.
Britten David L.
Humphreys Kevin J.
Kaiser Trent M. V.
Arola Dave W.
Barrigar Robert H.
IPSCO Enterprises Inc.
LandOfFree
Pipe coupling does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Pipe coupling, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pipe coupling will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1132332