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Couplings for standard A.P.I. tubings and casings

  • US 5,263,748 A
  • Filed: 09/30/1992
  • Issued: 11/23/1993
  • Est. Priority Date: 05/19/1982
  • Status: Expired due to Term
First Claim
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1. A threaded coupling for connecting adjacent sections of standard A.P.I. tubing or casing to upgrade the coupling for use under greater stress and pressure conditions than A.P.I. standards for use of the same tubing or casing comprising:

  • a pair of A.P.I. standards tubular products having thread tapers and diameters that are pre-screened to be within selected cumulative dimensional limits relative to nominal insertion in a collar;

    a collar having a length within ±

    0.010" of nominal and converging threads from each external end having precisely defined cumulative dimensional limits of approximately an order of magnitude less than the cumulative dimensional limits of the tubular products, the collar having a central threaded region with threads truncated at a predetermined internal diameter, the pair of tubular products being threaded into the collar to a spacing between the ends of about 0.750" to about 1.000"; and

    a ring having an outer diameter mating with a press fit with the truncated threads in the central region of the collar, the ring having an inner diameter substantially flush with the inner diameter of the tubular products.

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