Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1991-05-30
1993-01-26
Cuchlinski, Jr., William A.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277171, 277207A, 277236, 285917, F16J 1508
Patent
active
051817306
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a system for establishing a sealing connection between two axially impacting members in a pipe conduit.
Heretofore, various types of rapid couplings have been known, for example rapid couplings of a type as disclosed in Norwegian Patent Application No. 861655, where a number (for example 9 peripheral mutually separated) of hydraulic or pneumatic cylinders with associated locking bolts fix a socket member via locking grooves to an insert member. In the known construction, nine locking bolts are proposed to be used, but in practice there can be employed a larger or smaller number of bolts than proposed. Instead of locking bolts, it is also possible to use segments, for example segments which are each controlled by one or two hydraulic or pneumatic cylinders. The purpose of the segments is to increase the abutment surface for transferring a prestressing force and distributing the forces as uniformly as possible over the whole periphery.
In connection with boring of oil wells, a significant static weight loading occurs on the pipe conduit and its couplings, partly as a consequence of the weight of the pipe conduit itself and partly as a consequence of the medium pressure from linear material which is received in the pipe conduit between the pipe conduit itself and the drill stem. From time to time, sudden changes occur in the medium pressure in the pipe conduit, produced by back fire or so-called "kick", for example due to the bore intruding into a gas pocket and being exposed to a momentary pressure build up. These back pressures can be relieved in a by-pass and/or an exhaust safeguard, but before this can occur a considerable axial tension loading is produced in the members of the two different couplings. The tension loadings can in certain instances, produce significant problems, for example in the occurrence of intermittent openings of the joint between the two axially impacting members in the coupling and from this follows momentary leakage under particularly high pressure
Various types of sealing arrangements have also been known for sealing two abutting tube ends together in pipe conduits For example, U.S. Pat. No. 4,200,312 describes a sealing system for pipe conduits which is dependent upon different sealing arrangements in order to ensure sealing under different operative conditions.
U.S. Pat. No. 1,821,863 describes the use of an elastic metal sealing ring which is intended to provide a sealing effect by the high elasticity of the ring. However, specific types of metal and metallic properties are not described.
Accordingly, it is an object of the invention to provide a relatively simple sealing arrangement between two abutting tube ends in a pipe conduit.
It is another object of the invention to provide a reliable seal between two pipe-forming members of a coupling connection.
It is another object of the invention to provide a simple and reliable seal between two pipe forming members of a well head.
Briefly, the invention provides a sealing arrangement formed by a pair of pipe-forming members and a metal sealing ring disposed in sealing relation between the two pipe-forming members. The pipe-forming members are disposed in axial relation with each having an inner surface coextensive with an inner surface of the other member, a tapered sealing surface facing the tapered sealing surface of the other member and a support surface abutting the support surface of the other member.
The metal sealing ring is provided with an inner annular surface coextensive with the inner surfaces of the pipe-forming members, a pair of tapered sealing surfaces in sealing contact with the sealing surfaces of the pipe-forming members and an outer annular surface spaced radially inwardly of the abutting support surfaces of the pipe-forming members.
The arrangement of the sealing surfaces of the sealing ring and the pipe-forming members is such that upon axial movement of the pipe-forming members away from each other, for example under a back fire, the sealing surfaces of the ring slide along t
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"The Gasket": publ. by Goetee Gasket and Packing Co.; Nov. 1944, see Style P gasket.
H. Hugo Buchter, Industrial Sealing Technology, PP. 40-53, John Wyley & Sons.
Cuchlinski Jr. William A.
Cummings Scott W.
Friele Trading A/S
Hand Francis C.
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