Pipe coupling system and method

a coupling system and pipe technology, applied in the direction of pipe joints, sleeves/socket joints, screw threaded joints, etc., can solve the problem of limit the length of double-walled pipes

Inactive Publication Date: 2010-08-05
NAT OILWELL VARCO LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution effectively inhibits the continuous flow of corrosive materials into and out of the coupling's interior, protecting the coupling from corrosion and ensuring the integrity of the tubular connections.

Problems solved by technology

Many piping systems and pipelines transport fluids that are highly corrosive to the carbon steel used in the pipe.
In certain tubulars, there are limitations on the length of such double-walled pipes due to conditions to which the pipes are subjected on site.

Method used

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  • Pipe coupling system and method
  • Pipe coupling system and method
  • Pipe coupling system and method

Examples

Experimental program
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Embodiment Construction

[0050]As shown in FIG. 1A, a coupling system 10 according to the present invention has a coupling member 20 which is a generally cylindrical hollow member with interiorly threaded spaced-apart ends 22, 24 and an interior wall 26. Two tubulars 32, 34 are threadedly connected to respective ends 22, 24 of the coupling member. Between ends of the two tubulars 32, 34 and adjacent the interior wall 26 of the coupling member 20 is a ring 40 (shown schematically) which is any ring according to the present invention. Optionally the tubulars 32, 34 have a liner 36 which may be any known tubular liner. Optionally, the ring 40 has one, two, three, four, five or more (one shown) energizing member 42. Optionally, a recess, slit, or opening 44 (or recesses or openings) (all referred to as “openings”) leads from an exterior of the ring 40 to the energizing member(s) 42 which allow movement (e.g. axial movement of the ring) when compressive forces are applied to the ring without a change in volume o...

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Abstract

A tubular coupling system and method; the system and method in at least certain aspects, using a coupling member with an interior protective ring that has at least one inner energizing member which, upon compression, forces the body of the coupling member against an interior wall of the coupling thereby inhibiting corrosive material from contacting the coupling's interior wall or, in the event some corrosive material does enter this area, holding the interior protective ring against the coupling's interior wall so that the corrosive material remains in and does not exit this area, thus inhibiting or preventing a continuous flow of corrosive material.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application is a continuation of U.S. Non-Provisional application Ser. No. 11 / 540,939, filed Sep. 29, 2006, the entire contents of which are hereby incorporated by reference. Applicant has also filed co-pending U.S. Non-Provisional Applications No. (not yet assigned) entitled PIPE COUPLING METHOD AND SYSTEM contemporaneously herewith.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention is directed to tubular coupling structures; protection rings for such structures; in one particular aspect, to combinations of a pipe coupling, a protective interior ring, and two pieces of pipe coupled together by the coupling; and to corrosion-resistant threaded connection parts and assemblies for use with clad or lined tubulars, e.g., but not limited to, oil and gas well tubing and casing, piping in chemical and other plants, oil and gas pipelines, and the like.[0004]2. Background of the Related Art[0005]Many tubulars...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): F16L21/00
CPCF16L15/08
InventorMCLAUGHLIN, THOMAS KILPATRICK
OwnerNAT OILWELL VARCO LP