Abstract: A fluid coupling is disclosed having a first pipe member and a second pipe member. The first pipe member has an externally threaded end with synchronized thread portions. The second pipe member is configured to be received within the first pipe member. The coupling further includes a nut slidably and rotatably fitted around the circumference of the second pipe. The nut is internally threaded with a pair of synchronized threaded portions for mating engagement with the threaded portions of the first pipe member.

Abstract: A drill string includes a plurality of tubular members each having a connection with a pin connector and a box connector on adjacent tubular members. The pin connector has an external thread adapted for threadingly engaging an internal thread on the box connector of the adjacent tubular member. The pin connector has an outer groove for receiving a protuberance on the terminal end of the box member. The protuberance and groove have contoured surfaces providing large metal-to-metal contact for preventing the contoured surfaces from sliding during over-torquing and cyclic bending of the drill string.

Abstract: An apparatus for use in subsea well completion systems is provided. The apparatus has an isolation sleeve and an extension sleeve. The isolation sleeve has a first end, a second end and a longitudinal axis defined between the first end and the second end. The isolation sleeve has a generally tubular shape. The extension sleeve has a first end attached to the second end of the isolation sleeve to form an assembly comprising the isolation sleeve and the extension sleeve, a second end, and a longitudinal axis that is coaxially aligned with the longitudinal axis of the isolation sleeve. Like the isolation sleeve, the extension sleeve has a generally tubular shape.

Abstract: A coupling system comprises a first coupling member having a tongue that projects axially a distance therefrom, and a second coupling member that is threadable attached to the first coupling member. The tongue is inserted within a groove disposed within a second coupling member body. The tongue is axially displaced within the groove by rotation of one of the first or second coupling member relative to the non-rotated coupling member to form a leak-tight seal therebetween. At least one of the first or second coupling member body includes a hollow passage that extends axially therethrough. An elastomeric member is disposed within the groove and is interposed between a base portion of the groove and an end portion of the tongue.

Abstract: An array of a plurality of module blocks with a common through-passageway with a combined fluid coupling and mechanical connector fitting received in the passageway between each pair of adjacent blocks. The fitting has a swivel body rotatably retained by a flexible retaining wire on a main body with two static-type O-rings. The main body has external straight threads on one end and a hex head protrusion adjacent the other end. A fluid conducting through-passageway in the main body has an enlarged cylindrical counterbore open at the hex end and with a circular internal groove therein. A tangentially intersecting wire-insertion radial opening leads from an external surface of the hex head into this groove. The swivel body has external straight male threads at one end, a cylindrical shank at the other end and a fluid conducting through-passageway communicating at one end with the main body passageway and having a hex socket in the other passageway end.

Abstract: A threaded connection for improving fatigue resistance to cyclic loading is disclosed. The threaded connection basically comprises a pair of interlocking members having corresponding radially inner and radially outer spiral threads thereon, each spiral thread including a spiral compression flank and a spiral tension flank wherein at least one of the spiral compression flanks and spiral tension flanks on the inner spiral threads are in mating planar engagement with a corresponding spiral compression flank and spiral tension flank on the outer spiral thread. Axial spacing between the tension flanks and the compression flanks on the radially inner and radially outer spiral threads further define a stress reducing spiral root surface on at least one of the radially inner and radially outer threads and a corresponding crest surface on the other radially inner and radially outer spiral threads.

Abstract: An ultra high torque double shoulder tool joint (see FIG. 1) for maximizing the torsional strength of a threaded connection by correlating a transverse cross-sectional counter-bore area of the box (12) and pin (10). The pin 10 includes a base section 74 and a nose section 24. The nose section 24 defines a cross-sectional nose area 28. The pin external threads 22 include a taper no greater than 1/12. The box 12 includes a cross-sectional counterbore area 46 and a cross-sectional box area 52. The overall strength of the tool joint is dependent upon the torsional strength of the threaded connection, the cross-sectional nose area (28) and the cross-sectional counter-bore area (46).

Abstract: A pipeline is made by joining a number of pipe sections, each of which includes an inner pipe structure and an outer pipe structure. The outer pipe structure, which may be zinc plated or encased in an protective elastomeric material, includes mating couplings at each end to fasten similar sections together end to end. The inner pipe structure includes a hole extending throughout the pipeline and means for sealing around the hole at each joint. The inner pipe structure is resiliently mounted within the outer pipe structure. The outer pipe structure of each pipe section extends in both directions past the ends of the inner pipe structure.

Abstract: An improved sealable connector has a geometry which effects reliable sealing upon assembly. The connector is useful, for example, for connecting a pressure sensor to a fuel pump accumulator in a fuel injection system. The connector includes a male member, a female member, and an annular seal disc which compressibly seats between the male and female members. The male member has a tip with a flat annulus at an innermost radius surrounding a fluid-delivery bore. A frustoconical section of the tip extends radially outwardly from the annulus, sloping away from the plane of the annulus at about 5.degree.-15.degree., for example. The female member has a cavity shaped to receive the male member, the cavity having a bottom defined by a flat annular seat surrounding another fluid-delivery bore. The seal disc is compressed between the flat seat of the female cavity and the planar/frustoconical tip of the male member.

Abstract: A threaded joint for an oil well pipe having (1) a tapered threaded having roughly the shape of a buttress thread, (2) a pin having a male thread and a box having a female thread, (3) a seal and a torque shoulder, characterized in that(i) the load flank angle of the threads is -20.degree. or greater and less than 0.degree.,the stab flank angle is greater than 30.degree. and at most 60.degree.(ii) there is a positive amount of interference between the male threads and the female threads, and(iii) during and at the completion of make-up, the load flanks and the stab flanks are contacting each other, and there is a gap between the crests and the roots.

Abstract: A tool joint for use in connecting sections of pipe string for use in drilling. The joint is a pin and box connection of the type used in oil well tubing, casing, and the like. The driveable threaded joint has dual mating shoulders and nose faces on the pin and box members. The connection is designed so that compressive loads on the pin and box members are transferred substantially through the pin and box shoulders rather than through the thread form. The dual mating shoulders substantially improve the joint's ability to withstand the intense axial compression loading that occurs when driving the pipe into the ground.

Abstract: Single or multi-piece, pipe joint seal elements have at least one slidable interface that contacts a sealing surface of an end ring attached to a cementitious pipe liner. The slidable interface allows for slippage between seal pieces and/or seal piece-end ring surfaces during pipe joint assembly and disassembly. The end rings help distribute and minimize rotational and other stresses exerted upon the liner end surfaces and seal pieces. Such end ring surfaces further provide a quality surface for the seal element to effect a seal. The slidable interface seal is especially useful for joining brittle-lined pipe sections handling harsh fluids such as geothermal brine, etc.

Abstract: A piping structure and method of manufacture allow for the mechanical joining of two piping products as well as the hydraulic and mechanical sealing thereof by means of an elastomeric gasket having an integral pressure transference device. A socket is produced in one pipe product along with an integrally formed interlock means and the gasket. A spigot is produced in another pipe product along with an integrally formed interlock means complementary to the socket interlock means. The gasket is situated within the socket adjacent a tapered wall portion of the socket and is compressed by a tapered portion of the spigot. In a preferred form, the piping product is formed of a thermoplastic wherein the socket and spigot are easily formed after initial production of the piping product. However, the present joining system is not limited to after product formation and may be utilized for a variety of piping materials and methods of manufacture.

Abstract: A joint of the integral type includes a male element 1 and a female element 2 with a diameter close to that of the tubes. Each of the elements has two shifted frustoconical threaded sections 4, 5, 6, 7 with vanishing threads at the two ends, by virtue of convergences of frustoconical envelope surfaces 16, 17, 18, and 19 and cylindrical surfaces 20, 21, 22, 23. A central abutment 24 cooperates with the negative-flank threads to reinforce the male/female connection and two internal 27 and external 28 ring-shaped metal/metal tightness zones, preventing the penetration of fluid into the threaded zones from the ends. The threaded joint may be used with tubes for very deep wells for which the reduction of the diameter of the assemblies makes it possible to lower costs, and other tubes for which a problem of the same type may arise.

Abstract: A thread joint for a tube which suppresses galling without deteriorating its sealing performance since a sliding distance L.sub.S which expresses a quantity of spiral sliding of sealing portions relative to each other during a tightening period from the start of a contact between the sealing portions until shoulder portions abut each other satisfies the following relationship:Sliding Distance L.sub.S .ltoreq.-0.0093.times. (Tube Outer Diameter).sup.2 +4.73.times. (Tube Outer Diameter).To shorten the sliding distance L.sub.S, the sealing portion of a box portion is formed shorter than the sealing portion of a pin portion. In this case, a circumferential groove may be formed to discharge a dope. Conversely, the sealing portion of the pin portion is formed shorter than the sealing portion of the box portion. In this case, a precedent-stage unthread portion whose inclination is smaller than that of the sealing portion of the pin portion is formed between a male thread and the sealing portion of the pin portion.

Abstract: A strengthened pipe fitting for connecting to an externally threaded surface and a method for making a strengthened pipe fitting for connecting to an externally threaded surface is provided. The strengthened pipe fitting comprises a pipe fitting having an internally threaded surface initiating from the attachment end and a compression band fitted onto the attachment end of the pipe fitting. The pipe fitting is initially manufactured, in absence of the compression band, to have an internally threaded surface with a pitch diameter larger than that specified for mating with the externally threaded surface. The compression band is then fitted onto the attachment end of the pipe fitting. The compression band is uniquely sized to compress the internally threaded surface sufficiently so that the internally threaded surface of the strengthened pipe fitting mates with the externally threaded member.

Abstract: A multi-piece, pipe joint seal has a slidable interface between seal pieces. The slidable interface allows for slippage between pieces during pipe joint assembly and disassembly, minimizing rotational and other stresses on the seal pieces and pipe sealing surfaces which may damage or endanger the deformable seal. The slidable interface seal is especially useful for joining brittle-lined pipe sections handling harsh fluids.

Abstract: A threaded pipe joint including an externally threaded male section and an internally threaded female section having mutually engageable threads the corresponding roots and crests of which define a helical path through which fluids from said pipe section may leak. The threaded area of one of the pipe sections is provided with a radially disposed blind recess in which is placed a seal plug of extrudable generally nonresilient material.

Abstract: The invention describes a pipe for carrying fluid, including thermally insulated steel pipe sections of a type including an outer tubular shell, an inner cylindrical shell of smaller diameter, in the inner shell being sealingly welded to the outer shell at each of the ends of the pipe sections. It is characterized in that at each joint, the ends of the two inner shells are welded to each other, and a sleeve links to the ends of the outer shells so that when traction, compression or bending forces are exerted on the pipe, the said sleeve transmits these forces to the outer shells.

Abstract: A non-upset tubing section, a tubular coupling, a connection for non-upset tubing sections, and a method for connecting the non-upset tubing section and the tubular coupling are disclosed. Methods for fabricating the non-upset tubing section and the tubular coupling are also disclosed. In one embodiment, the non-upset tubing section has an outer diameter of about 23/8 inches and, in another embodiment has an outer diameter of about 27/8 inches. The non-upset tubing section also has an externally tapered threaded surface having approximately eight rounded threads per linear inch. The tubular coupling has an outer diameter of about 27/8 inches, for use with at least one 23/8 inches OD tubing section, or about 31/2 inches, for use with at least one 27/8 inches OD tubing section. The coupling also has an internally tapered threaded surface having approximately eight rounded threads per linear inch and having a pitch diameter of about 2.258 inches for use with the 23/8 inches OD tubing section or about 2.

Abstract: A multi-piece, pipe joint seal has a slidable interface between seal pieces. The slidable interface allows for slippage between pieces during pipe joint assembly and disassembly, minimizing rotational and other stresses on the seal pieces and pipe sealing surfaces which may damage or endanger the deformable seal. The slidable interface seal is especially useful for joining brittle-lined pipe sections handling harsh fluids.

Abstract: A pipeline with threaded pipes and a sleeve connecting the pipes which is hung in a drill hole for transporting a liquid and/or gaseous medium. An electrically driven pump or compressor is arranged at the start of the pipeline in the region of the base of the drill hole and the electric motor is supplied with electric power via a cable hung in the drill hole. In order to allow for large cable cross sections for the electric drive of a turbopump or a turbocompressor and to prevent impermissible loading of the cable, each sleeve of the pipeline has at least one groove extending in the longitudinal direction at its outer casing, the cable being guided in this groove.

Abstract: A pipe joint for first and second profile wall pipes of the type having generally concentric, spaced apart inner and outer walls, and a helical rib connecting the inner wall to the outer wall. The convolutions of the helical rib extend in multiple turns around the exterior of the inner wall and along the interior of the outer wall for substantially the entire length of the pipe. The pipe joint includes a first exposed portion of the rib of the first pipe, and a second exposed portion of the rib of the second pipe. The exposed helical rib of the first pipe is threadably interengaged with the exposed helical rib of the second pipe.

Abstract: A well tube liner system includes rigid, self supporting plastic liners inserted within well tube sections and including end flanges adjacent opposed ends of the tube sections for sealing against each other and against a connecting collar when the tube sections are drawn axially together during assembly of the tube sections. An auxiliary spacer corresponding in general configuration to the flanges is provided for insertion between the flanges of liner sections to maintain the flanges in axially spaced apart and sealed condition to compensate for worn threads while retaining the same liner sections.

Abstract: A lined pipe joint with an improved collar seal and pipe lining end therefor. The pipe lining end is disposed at the end of the liner in the pipe. The lining end is adapted to shoulder against grouting material which holds the liner in place such that longitudinal contraction of the liner is prevented. The lining end also has a tapered bore therein which compensates for any inward deflection of the pipe section when threadingly engaged with a pipe fitting. The collar seal fits within the end of a pipe section which is to be connected to a pipe fitting. A sealing check valve on the collar seal provides sealing between the collar seal and the pipe section when pressure within the pipe section is greater than pressure outside the collar seal. The sealing check valve allows relief of pressure outside the collar seal into the pipe section when the pipe section is depressurized, so that damaging inward deflection of the pipe liner is prevented. A method of assembling the pipe joint is also disclosed.

Abstract: A pipe coupling system including a modified collar (12) into which a first pipe (40) and a second pipe (30) are inserted. In a first embodiment, a ring (22) resides within the collar which can serve as a torque shoulder or a metal to metal seal. In a second embodiment, a composite element (22') is formed of three concentric rings, a first ring (41) being composed of a Teflon.RTM. like material, a second ring (44) being composed of a Torlon.RTM. or Peek.RTM. like material, and a third ring (42) composed of a Teflon.RTM. like material. The adjoining surfaces (60,61) of the rings (41,42,44) form leakage paths to relieve accumulated pressure within the collar thread voids (51). A slip on gauge (52) is disclosed for prescreening pipe to insure that it is within the tolerances required for the present system. A bucking plug (8) is disclosed for insuring that the first pipe (40) is inserted within the collar (12) to the proper depth.

Abstract: The anti-seizing coating according to the invention relates to the protection of the surfaces of male (7) or female (2) components of an assembly means (1) for metal tubes by threadings coming into contact with one another at the time of screwing.This coating is constituted by a thin lead oxide layer (14) produced by the oxidation of a lead layer, which is itself formed on an underlying layer (13) of a metal such as copper and which has been directly or indirectly deposited beforehand on the surface (4, 5, 9, 10, 11, 6) to be protected against seizing. The invention also relates to the process for producing this coating and the coated assembly means obtained.

Abstract: A self-sealing pipe thread provides a connection for internally pressurized PVC pipes without the necessity of using sealant, O-rings, or gaskets. The thread holds pressure inside of the pipe and does not let gas or liquid to come in contact with any of the other threads. The sealing thread is provided by the tangential intersection between a flat annular sealing surface integrally formed on the head of the inside pipe thread and an annular line edge defining the inside edge of the ring step on the base of the outside pipe thread.

Abstract: One or more rigid sealing segments are attached to pipe end sections and the assembly lined to form a fluid-resistant joint. A segment surface forms the primary sealing interface of lined pipe sections without the need for a conventional removable liner edge seal. The lining process and configuration sealably bonds the liner to the fluid-resistant sealing segment and to the non-fluid-resistant pipe. The manner of bonding both avoids (or limits) liner stress and covers the non-fluid-resistant material of the pipe. In an alternative embodiment, the sealing segments are engaged at mating threaded surfaces, the mated threads providing a single primary sealing and engagement interface. Redundant liner end sealing may also be accomplished by a sandwiched deformable material if added reliability of sealing harsh fluids is desired. In another embodiment, portions of the rigid sealing segments are slidably mounted relative to each other and the primary seal interface is temperature actuated.

Abstract: A pipe coupling assembly of threaded and coupled (T and C) type for forming well strings by operably connecting lengths of pipe or tubes in a coaxially aligned relationship. The interior longitudinal bore of the pipes are preferably lined or coated with a corrosion resistant material. A plastic corrosion barrier seal ring is operably positioned in a recess in the longitudinal bore of the coupling member to protect the metal-to-metal seals, torque shoulders and engaged threads of the coupling assembly and pipes from contact with corrosive fluids. The plastic seal ring prior to thread make up is substantially rectangular in cross-section with a radial dimension between the outside and inside diameter or width equal to a greater than 1.5 times the axial or longitudinal height.

Abstract: The invention provides a male thread as a universal thread which may be screwingly connected with different types of female thread. It includes a taper thread section at the front or free end which is followed by a cylindrical thread section. The latter is constituted by a cylindrical BSP thread or a Withworth pipe thread corresponding to the respective thread nominal size, the number of threads per inch being selected to be equal to the nominal value conventional for the nominal size of thread. The number of threads per inch in the taper section is in a range between the nominal values of the cylindrical thread section and of an NPT thread with the same size. Furthermore the invention proposes a female thread with the same design, which may also be used as a universal thread.

Abstract: A composite fiberglass tubular coupling comprising an elastically deformable liner. The interior surface of the liner is threaded inwardly from each opposite end. A plurality of buttress ridges are located on the exterior surface of the liner and the exterior surface of the liner is overwound with thermoset resin impregnated fiberglass reinforcing fibers.

Abstract: A pipe joint for use with a pipe thread provided on a fluid apparatus has a thread designed to mesh with any of pipe threads of different types of the same nominal diameter. Design of the pipe joint is simple because the thread provides mechanical connection, whereas a separate sealing member provides a non-leaking union. The screw-in portion of the pipe joint has an external or an internal thread that meshes with the innermost or the outermost of commonly used mating pipe threads of different types having the same nominal diameter. The axial length of the thread is reduced to a minimum within the limit that the desired firm mechanical connection is secure.

Abstract: A tubular connector joint has a pin member on one of the tubular members and a box member on the other of the tubular members. External pin threads are formed on the exterior of the pin member. Internal box threads have the same pitch as the pin threads. A latch ring locates between the pin threads and box threads. The latch ring contracts and has threads on its inner and outer diameter that mate with the threads of the two tubular members. A drive key causes the latch ring to rotate with the pin member. The latch ring contracts when the upper tubular member stabs into the lower tubular member. A short amount of rotation then causes the drive ring to engage the threads of the lower tubular member.

Abstract: A tubular connection employing two separate non-concurrent threaded sections, each of which nearly decays, that is, runs out on a tubular surface, one on the outside diameter of the male tubular member, and one on the inside diameter of the female tubular member, thus providing a joint with nearly the strength of the tubular body in tension without the use of a coupling. The female tubular member is expanded through a cold swaging operation before being finished with the two threaded sections. Additionally, the connection features a torque stop and cylindrical seal in the middle of the two thread steps, where stresses may be kept low. The thread elements are reverse angle locking with S-shaped load flanks which reduce stress concentrations and provide a clamping action on the centralized seal. Because of this unique seal, the connection can take cyclic application of external and internal pressure without leaking, a feat non-coupled and non-upset connections of prior art have not achieved.

Abstract: A pipe joint is provided wherein mating female and male threads are ground or scribed into the ends of the pipes to be joined. At least one of the scribed threads has a paste thread contact molded onto it so that the valley of the contact molded thread is below the crest of the scribed thread. Upon mating of the coupled pipe ends, the contact molded thread surface provides a smooth finish and a relatively low, consistent engagement and disengagement torque. The overlapped crests of the scribed male and female threads provide for mechanical interlock and correspondingly enhanced tensile strength in the joint. The invention is particularly suited to pipes made of resin reinforced with wound filaments, where the scribed threads can be cut shallowly to retain the strength of the body of the pipe and minimize cutting of the wound filaments.

Abstract: The overall description of this invention is a truncated buttress-type thread form that incorporates a reverse-angle tension load flank with a compression flank and a torque shoulder; the thread does not have any radial interference designed into it, but the hooked tension flank does tend to pull the pin and box together once the torque shoulder is engaged. The mating compression flanks have designed into them a minimum amount of clearance prior to the shouldering action, which then closes to zero or very near zero at the moment the shoulder is engaged. This drawing together is due to the tendency of the hooked threads to pull together at shouldering if there exists no radial interference in the thread body. The thread roots and crests can be tapered, parallel to the taper of the thread body, or flat and parallel to the pipe axis but maintain adequate clearance to allow some closure once the shoulder is engaged so that the compression flanks can draw together.

Abstract: A pipe thread sealant paste composition comprising from about 30 to about 80 percent by weight of natural flake graphite particles of a size sufficient to pass through a 100 Tyler mesh sieve and a liquid carrier comprising a mixture of mineral oil and petrolatum, the paste composition preferably having a total ash content of no greater than about 1 percent by weight and containing leachable chlorides in amounts equal to or less than about 50 parts per million. The invention also relates to a method for preparing and applying the pipe thread sealant paste to pipe joints.

Abstract: A two or three piece seal apparatus and method is described for providing a positive seal of threads in extreme temperature ranges up to 2000.degree. F. for at least 20 minutes. A stainless steel compression/retaining nut is utilized in combination with a high temperature alloy ring or diamond-shaped seal to effect sealing of the threads.

Abstract: A method is disclosed for relining buried pipeline with interconnectable plastic type pipe sections. The method comprises gaining access to an open end of the buried pipeline, such as through a manhole, passing pipe sections down the manhole and inserting individually each pipe section into the buried pipeline open end. Each pipe section is of a length to permit, within the confines of the manhole, insertion of each pipe section into the pipeline open end. Each pipe is of a diameter to fit within the pipeline. The pipe section to be inserted is interconnected to the pipe section already inserted within the buried pipeline. Such interconnected sections are sequentially moved into the buried pipeline to permit insertion of the next pipe section into buried pipeline until the entire length of the pipeline to the next access area has been relined.

Abstract: The box end of a threaded joint has an interior profile of an inwardly tapered threaded section, followed by a smooth sealing surface parallel to the longitudinal axis of the threaded joint, followed by an increased diameter seal ring groove, followed by an inwardly tapered smooth sealing surface. The pin end of the joint has an external torque shoulder, followed by an inwardly tapered threaded section, followed by a reduced diameter pipe dope reservoir, followed by an extrusion hump used to extrude a deformable seal ring used in the seal ring groove, followed by an inwardly tapered smooth sealing surface. When the threaded joint is fully made up, the entrapped seal ring has a primary metal-to-metal seal on its one side, formed by the mated smooth, tapered surfaces, and a secondary metal-to-metal seal formed by the extrusion hump and the surface above the seal ring groove.

Abstract: A fitting construction used for connection of pipes comprising a first pipe assembly having an inner pipe and an outer pipe separated by a wall flange, a corresponding second pipe having a threaded end, a slip-nut having internal threads on its wall part, and first and second gaskets. Either the inner pipe or the outer pipe of the first pipe assembly is provided threads thereon for threadedly engaging or connecting to the second pipe. The second gasket is shaped and sized to be placed on an end face of the second pipe and compressed between it and the wall flange. The outer pipe has an externally threaded end for threadedly engaging the slip-nut with the first gasket being compressed between a cap part of the slip-nut and an end face of the outer pipe.

Abstract: A connecting joint for connecting two tubular members together has a pin and a box, each containing conical threaded sections. The pin and the box each has a locking section for locking the pin and box together during make-up. Each locking section has at least one circumferential profile with a crest. The crests are dimensioned so that they interfere with each during make-up. A shoulder locates below each crest. This shoulder is conical and opposite to the taper of the threaded section. The decree of taper of this shoulder is high relative to the longitudinal axis of the pin and box, requiring a large breakout force.

Abstract: A self-locking, externally threaded locking nut the outer periphery of the nut adjacent the threaded portion thereof having an annular groove in which is positioned an elastic ring. Portions of the outer periphery of the elastic ring are deflected outwardly by the nut to form protuberances for effecting increased frictional resistance to turning between the locking nut and a threaded cylindrical body to produce a locking action.

Abstract: An improved connector has a flexible braided metal hose assembly with a compression fitting or pipe fitting at one end and a special composite fitting assembly with an electrically insulating insert in a metal male outer fitting at the other end for connection to the water line of an appliance, such as a hot water heater.

Abstract: A ratcheting and threaded connector for connecting an upper and lower tubular member which allows an upper member to be connected to a lower member with a ratcheting action and on subsequent rotation causes a threaded spring to move into position to engage shoulders on both the upper and lower members to place them in a rigid and tight relationship. Multiple load bearing shoulders on each of the members coact with load bearing shoulders on the spring to provide a substantially equal balance load distribution and allows the connector spring to have a minimum thickness.

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.

Abstract: A gas-tight joint for pipe linings and risers inside a bore, consisting of a neck with an outside thread and of a matching collar with an inside thread, with a groove in the vicinity of the thread on the collar and/or of the thread on the neck to accommodate a deformable gasket that, when the joint is screwed tight, is demarcated and deformed by the base of the groove in the neck and/or in the collar and by the contour of the thread on the other component. The cross-sectional area demarcated by the base of the groove in the neck and/or collar and by the contour of the thread on the other component once the two components have been screwed together remains constant along the groove and is equal to or larger than the cross-sectional area of the deformable gasket before the components are screwed together.

Abstract: A conduit coupling assembly for connecting the end portions of a pair of lengths of conduit in coaxial relationship. The end portions of the lengths have external threads of the same size. The coupling assembly includes an annular outer coupling member and an annular inner coupling member for reception by the outer coupling member. The outer coupling member has a first end including an internal screw thread sized for threading onto the end portion of one of the conduits. This outer member also includes a second end including an outer wall defining a cavity with the outer wall having at least one threaded aperture therethrough opening onto the cavity. The inner coupling member includes a first end and an internal screw thread sized for threading onto the end portion of the other of the conduits.

Abstract: A pipe thread sealant paste composition comprising from about 30 to about 80 percent by weight of natural flake graphite particles of a size sufficient to pass through a 100 Tyler mesh sieve and a liquid carrier comprising a mixture of mineral oil and petrolatum. The paste composition preferably having a total ash content of no greater than about 1 percent by weight and containing leachable chlorides in amounts equal to or less than about 50 parts per million. The invention also relates to a method for preparing and applying the pipe thread sealant paste to pipe joints.