Abstract: A gauging device and method for use in coupling threaded tubular articles including tubes and couplings. The device and method provides for the use of gauges for the tube and coupling that provide markings thereon that when in register during coupling indicate when a preselected threading distance has been achieved. A coupling assembly is provided that employs an annular gasket attached to the coupling and adapted to be deformed by the end of a tube when inserted into the coupling to provide sealing.

Abstract: A pipe coupling for a stainless steel well casing includes a square threaded male member which is received within a square threaded female member so that the coupling is initially loose. A TEFLON seal is provided to retain the fluid being pumped within the pipe. Each member has a shoulder which is abutted by the end of the other member in order to lock the members in rigid relationship once the coupling is completely tightened.

Abstract: A coupling between parts subject to differential expansion and contraction comprising first and second sealing abutments and an intervening constraint on relative movement whereby differential movements provide a self-compensating tightening and loosening of the sealing abutments. The coupling is especially useful for joining tubular parts such as caps or spray nozzles in containers for agricultural chemicals.

Abstract: The present invention is directed to an apparatus and method for assembling, aligning and securing a sealed connection. The apparatus and method of the present invention advantageously employ the mechanical leverage of a threaded connection, preferably square threads, to overcome the high O-ring seal friction associated with large diameter, high pressure O-ring seals. The disadvantages of threads are eliminated by the use of thread relief grooves adjacent and interior to the threads. The thread relief grooves must be of sufficient length and annular dimensions to accommodate the disengaged upset threads therein to permit free rotation. The combined length of threaded engagement must be sufficient to move the O-ring seal into sealing engagement to fully achieve the advantageous ease of assembly of the present invention. Further, this connection is unlikely to separate during use in that disengagement of the threads into the thread relief grooves prevents back off where high make up torque is not employed.

Abstract: A portable cleaning tool (12) for cleaning the bore (38) of a valve (10) comprising a tool fitting or connector (52) with a reduced diameter inner end portion (82) having an O-ring (86) for sealing against an enlarged bore portion (40) of the valve body (18). The conenctor (52) is threaded within the enlarged end bore (44) to engage in abutting relation an internal shoulder (46). The cleaning member (60) is of an enlarged diameter and has a tapered seat (63) adapted for seating in a retracted position on a mating tapered seat (88) of the connector (52) to prevent any blowout of the cleaning member (60). One embodiment shown in FIGS. 5 and 6 has an internally threaded nut (108) threaded onto external mating screw threads (110) on the valve body and engaging a retainer ring (106) on the connector body (53A) for mounting the connector (52A) on the valve (10 A).

Abstract: A joint for joining together lengths of fiberglass reinforced pipe or assembling joint components to a length of fiberglass reinforced pipe has abrasive threads capable of cutting matching threads into the surface of the pipes being joined. The abrasive threaded coupling requires no shaving or other surface preparation of the pipes to be joined for assembly of the joint. If a bonding adhesive is used in the joint, the joint is not sensitive to and will not be damaged by the movement of the joint before the adhesive has cured. The abrasive threaded joint can be modified for use as a pipe coupling, fitting, flange, adapter or a quick and effective repair coupling.

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 coupling assembly having an annular coupling with internal threads in threaded engagement with external threads on opposed tubes inserted into the coupling. An annular gasket of rigid material is mounted between and in engagement with opposed ends of the tubes within the coupling. This gasket has a continuous radial portion extending between these opposed ends of the tubes and a pair of opposed flanges extending from opposite sides of the continuous radial portion and into contact with an interior marginal portion of the opposed tubing ends. Sealing is provided between the opposed ends of the tubes.

Abstract: A coupling between parts subject to differential expansion and contraction comprising first and second sealing abutments and an intervening constraint on relative movement whereby differential movements provide a self-compensating tightening and loosening of the sealing abutments. The coupling is especially useful for joining tubular parts such as caps or spray nozzles in containers for agricultural chemicals.

Abstract: A threaded joint for oil-well pipe comprises a box having an internal thread, a pin having an external thread, a metal-to-metal sealing contact provided at the unthreaded tips of the box and pin, and a film of grease applied on the surface of the internal and external threads. The cross-sectional area of a void containing the screw axis left between the meshed internal and external threads is at least 0.6 mm.sup.2 per pitch.

Abstract: The invention concerns a steel tube threaded joint particularly useful in the petroleum industry of the type in which the male element (3) and female element (1) are combined by threading (2, 4) wherein a portion of the surface of each thread is forcefully applied to the status of screwing to the thread of the outer element. A first element (1) of the joint has a composite structure and has on at least a certain length of its thread a lining of synthetic material whose volume and shape correspond exactly to the volume and shape of the existing clearance of the screwing status between the metal part and composite element (1) and the second element (3) having dimensions at the limit of the machining tolerances which allow the greatest possible clearance in the assembled state of the joint.

Abstract: A threaded joint for steel pipes useable in particular for the petroleum industry is provided. The joint is formed by threaded male and female elements wherein one part of the thread of a first element is strongly applied against the thread of the other element. One of the elements contains a groove having a length of at least one thread pitch and a depth greater than the height of the threads. A sealing device is provided in the groove consisting of a synthetic lining whose volume and shape essentially correspond to the volume and shape of the play that would exist between the threads of the elements.

Abstract: A thread form for a tubular connection between sections of large diameter pipe or casing having a pin member adapted to be made up with a box member, utilizing converging, trapped thread flanks and mating shoulders and end faces with dissimilar angles. The thread crests and roots make contact with each other before the thread flanks are touching. At final make-up, the thread flanks of the pin member are trapped by the thread flanks of the box member. The stab flanks assist the shoulders/end faces in resisting axial compressive loading. The different angles between the mating shoulders and end faces are such that the deformation of the shoulders upon axial compressive loading is less than the preferred maximum yield of the critical area. The amount of load bearing forces on the shoulders and end faces are predictable and can easily be controlled within the preferred axial deformation of the critical area.

Abstract: An anaerobic sealant composition is employed to seal a pipe joint between pin and box members intended for use in petroleum drilling operations. The composition is applied to one or both of the members. The members are then joined and the composition cured into a solid form which bonds to the members and fills the space between them. The constituents of the composition can be selectively varied to control its lubricity which also affects the make up torque. Additionally, the concentration of the sealant composition can be selectively varied to control the break out torque of the joint to which it is applied, and preferably make the break out torque substantially greater than the make up torque. Excellent seals can be obtained using lower grade pipe, and the pin and box members can be made up with the application of lower torque to the assembly without reducing the sealing capabilty of the connection. The preferred composition also serves as a rust and corrosion inhibitor for the joint.

Abstract: A resilient seal ring for a tubular connection having an outside periphery that comes to a peak. The peak includes preferably two chamfered sides at respective angles to the axis of the ring that are greater than the adjacent conical surface angle. The crown of the peaked top is preferably flat. The connection includes a rectangular groove in a shallowly tapered conical surface of the pin member, preferably on a forward metal-to-metal sealing surface. The groove is slightly less deep than the seal ring.

Abstract: Escape of the blow medium at the blow mandrel/HDPE contact surface is prevented during extrusion blow molding of HDPE with an aggressive blow medium if a blow mandrel with a movable sealing element is used.

Abstract: A swivel spout sub-assembly is disclosed for use on water faucets with the swivel spout sub-assembly being of simplified configuration to provide facile assembly and disasembly thereof. The swivel spout sub-assembly includes a water output nipple on the faucet and a swivel spout structure including a shroud body having an axial bore in which the nipple is coaxially disposed. The shroud body and the nipple are especially configured to interact with each other to provide a means for assembling the spout structure on the nipple, allow the spout structure to be moved in a swivel motion about the nipple and prevent unintentional removal of the spout structure from the nipple.

Abstract: A fluid transfer module is provided with multiple flow paths for transferring multiple fluids. The module is particularly useful in downhole pumps for passing oil upwardly through a central passage and for passing gas up or down through concentric passages around the central passage. The module also can be used for water or fuel, particularly for downhole steam generation. The module includes an elongate housing or production tubing with an inner coupling having an attached, elongate inner tube which together form a central passage extending substantially the length of the housing. An outer coupling with an attached, elongate outer tube form an inner concentric passage with the inner coupling and tube and an outer concentric passage with the housing. The concentric flow paths are less restrictive to the flow of fluids therethrough.

Abstract: A tubular connection is disclosed having a small diameter thread set and a large diameter thread set, the small thread set having a lesser number of threads than the large set. A primary torque shoulder is located between the threads sets and a secondary torque shoulder is located behind the large thread set. In the preferred embodiment, the initial partial thread on the pin of both sets and the last partial thread of the small set on the box has a cylindrical root contour, whereas the remainder of the threads are tapered. The longitudinal taper angle of the pin thread sets are dissimilar to the box thread sets, there being a maximum separation of the sets near the center of the connection. Such dissimilar tapering tends to equalize the stress applied to the threads under tension loading. At the center, a seal is provided with hooked threads on either side thereof. The arrangement also provides a torque shoulder at either end of the large thread set.

Abstract: A pipe coupling for a stainless steel well casing includes a square threaded male member which is received within a square threaded female member so that the coupling is initially loose. O-ring seals are provided to prevent the fluid being pumped from corroding threaded portions of the male and female members. Each member has a shoulder which is abutted by the end of the other member in order to lock the members in rigid relationship.

Abstract: An improved pipe coupling protector including a thread protector with sleeve is disclosed. Moreover, a method of installation is also set forth. When manufactured, the sleeve is sized to fit over the threads on the exterior of a pipe end and has a surrounding end shoulder with a transverse cap. An undercut defines the cap for removal by puncturing action to enable the sleeve to move up the threads. At the time of installation, the pipe is threaded to a coupling. A lubricant or sealant is applied to the threads. The coupling and the sleeve of the present disclosure completely cover over the threads and they are sealed against atmospheric intrusion and capillary fluid flow along threads and at the coupling face by the sleeve with an underlying layer of sealant or lubricant.

Abstract: An improved pressure type connection on stepped-thread Hydril-type tubing and casing tool joints is disclosed, wherein a secondary sealing means is included between the stepped threaded areas of the Hydril-type connector. The secondary sealing means includes an annular ring of relatively rigid, internally tenacious plastic or rubber material, which serves to contain well pressure if the metal-to-metal sealing surfaces on the pin and box members of the Hydril-type connector are damaged. With such secondary sealing rings, damaged Hydrill-type connectors can still be used, without having to scrap same, or having to repair the damaged area at great expense.

Abstract: A pipe joint for thin-walled tubes (13, 14) is provided for transmission of water. The pipe joint includes a male portion (11) and a female portion (12) both of which having pressure cut threads (18, 21). At mounting thereof these portions (11, 12) are threadably engaged so that a seal ring (25) received in an annular extension (23) of the female portion (12) is brought into engagement with a conical portion (16) of said male portion (11) so as to provide tightening of said pipe joint.

Abstract: A conical thread configuration for providing a strong simple and rapid make-up connection of pin and box members particularly for connecting sections of pipes, casings and conductor pipes, anchoring pipes, wellheads and risers, particularly for offshore oil production. Each connecting member has a plurality (n) of thread lead entries on a frusto-conical surface, (n) being at least equal to two and at most equal to AD.times.p.times.1/6.25 in which AD is the average diameter of the frusto-conical surface bearing threads (in inches) and p is the number of threads per inch. The radial dimension of the engaged thread overlap after make-up is smaller than the variation VR of the radius of the frusto-conical surface on one thread pitch and larger than 1/2n of variation VR. Less than one turn is necessary for make-up or disconnection.

Abstract: A tubular connector for adjoining two adjacent joints comprising a first pin end on a first joint, a second pin end on a second joint and a tubular coupling member with suitable threads for mating with both pin ends. Each pin end is tapered and includes wedge threads. The wedge threads achieve a metal-to-metal seal upon makeup by providing a root-and-crest bearing surface prior to makeup. As an addition, a metal-to-metal conical seal can be provided in front of the most forward thread revolution on the pin ends. Further as an addition, an elastomeric seal can be provided in a circumferential groove just forward of the conical seal for making a compound seal therewith. A corrosion barrier ring can be included in the coupling member for filling the gap between the tip ends of the two pin ends being joined.

Abstract: An improved seal ring comprising a polymeric material ring in combination with a softer polymeric material ring. The seal ring can be used in either male or female fittings and is adapted to seal by mating engagement of the polymeric material with one set of threads and a recess in the other set of threads.

Abstract: Disclosed is a method and apparatus for forming a pipe joint for securing lined pipe sections together. A portion of the liners of adjacent pipe sections are overlapped and compressed when the pipe joint is made up so as to seal against the migration of pressurized fluids from within the pipe sections.

Abstract: Disclosed is a method directed particularly to improving a modified threaded buttress collar. The method is also of value with any internally threaded member having a seal ring groove therein. The method specifically deals with the removal of the feather edge thread created when a seal ring groove is placed within an internally threaded member. Such groove usually provides residence for a seal ring. When the groove is placed in the internally threaded member there is created a feather edge thread immediately adjacent the groove. This feather edge thread is easily deformable and can create severe galling problems within the coupling.The feather edge is removed, preferably, in stepped fashion utilizing a machining tool such as a grooving tool within a computer numerically controlled lathe. The grooving tool is set such that as the coupling turns in the lathe, the movement of the grooving tool matches the pitch and helix of the threads and the speed of the lathe.

Abstract: A connection for plain end well liner pipe and the like uses a threaded pin and box having a locking reverse angle thread profile to prevent radial separation of the pin and box due to deep well pressure and make-up pressures. The connection includes a primary internal seal structure wherein a metal-to-metal interference seal is located adjacent a thermoplastic ring seal. Separation of the interference seal due to the proximity of the thermoplastic seal is prevented by the locking thread profile. An external seal uses a metal-to-metal interference seal enhanced by a locking torque shoulder seal which acts with the thread profile to prevent radial separation of the interference seal.

Abstract: A threaded pipe connection is disclosed that has threads the flanks, roots, and crests thereof form thread seals when the connection is made up and that has a seal ring of resilient material that is trapped in a cavity between a groove in either the box or the pin and the thread seals to provide a secondary seal.

Abstract: A method of protecting mating screw threads at least under tightening torques is described in which a dry lubricant such as molybdenum disulphide is applied to one screw thread, and a liquid lubricant is applied to the other screw thread. The screw threads are then tightened to the required torque value. When completely mated the leakage path will not be masked as a result of volatilization of any of the components of either lubricant.

Abstract: A connecting arrangement comprising a threaded sleeve of synthetic plastic material and a tube portion having a pipe thread. The threaded sleeve contains an insert nut with an internal thread and a synthetic plastic ring which is engaged by the pipe thread of the tube portion. The tube portion has at its forward end a supplemental sealing ring which sealingly engages a sealing region of the synthetic plastic ring. The sealing region is spaced from the axial ends of the threaded sleeve and has an inner diameter which is smaller than the outer diameter of the sealing ring. A further seal may be provided by disposing an adhesive sealing mass in an annular groove on the tube portion such that the mass adheres the tube portion to the sleeve when they are connected.

Abstract: A pipe coupler with sealing apparatus for use with lined or unlined pipes has a pipe connector member having a bore for receiving a floating seal means intermediate to threaded pipe holding portions. The bore includes a bottom portion between first and second recesses. The first recess is provided with a stop side for prepositioning the floating seal means. The floating seal means includes a steel ring having opposing end recesses; the inner diameter side and two ends are substantially encased with a resilient plastics material. The steel ring has a width greater than the width of the bore's bottom portion. When pipes are initially fitted to the pipe connector, the steel ring abuts the stop member with the resilient plastics extending over the stop. When finally torqued, the torque is equalized between the pipes, and the steel ring of the floating seal means is centered over the bore's body portion with ends extending partially over the bore's recesses.

Abstract: A threaded pipe connection is disclosed having tapered sealing surfaces between the ends of the threads on the box and pin that engage and a resilient seal member located in a groove about midway between the ends of one of the surfaces to form a seal with the other surface when the joint is made up with the two surfaces forming independent metal-to-metal seals on both sides of the resilient seal member.

Abstract: A joint and male and female tubular elements are disclosed where the threads of the female and male members have negative load flanks and have two or more radial steps axially separated one from another by a reverse angle torque shoulder having one or two adjacent conical sealing surfaces. The reverse angle torque shoulder serves as a positive assembly stop. The negative load flank angle of the threads and the reverse torque shoulder angle combine to interlock the male and female members and to prevent differential radial separation of the conical sealing surfaces when the joint is exposed to internal pressure, external pressure or both. Tapered threads and sealing surfaces and interference threads may advantageously be used in joint construction.

Abstract: A sealing arrangement for the pin and box of a threaded connection between tubular members includes annular piston means for positioning in the box of one of the tubular members. Resilient seal means supported on the piston means seals between the pin end, box and piston means when the pin is threadedly engaged in the box. Additional seal means on the piston means is responsive to fluid pressure in the tubular members whereby the piston means may be urged toward sealing engagement with the pin end and the resilient seal means.

Abstract: An improved pin member adapted for use in a tubular connection where said pin member is adapted for coaxial threaded engagement with a box member having a counterbore for receiving the pin member. A pilot surface is disposed from a distal-proximate end to the distal end of the pin member inclining to a lesser extent than the angle of the incline of an internal sealing surface of the pin member. The pilot surface is substantially parallel to the axis of the connection. This pilot surface allows the end-of-pin flat thickness to be increased thereby allowing positioning of the interengaged threads so as to provide an increased radial thickness of the box member thereby increasing the axial tensile strength capability and burst pressure rating of said tubular connection while additionally protecting said internal surface of said pin member and providing a rugged end-of-pin flat.

Abstract: A tieback connector 10 for connecting tieback conductors 14 between a platform and a casing hanger 22 in a subsea well system 20 comprising a split ring 44 on a connector body member 12 having external threads 32 capable of mating with internal threads 24 on the casing hanger 22 and capable of ratcheting over said internal threads 24 as the connector is stabbed into the casing hanger 22. Rotation of the connector 10 will actuate a locking means 54-66 (and 54A-66A) by the combined action of the threads and relative axial movement of said split ring and body member 12 to thread and lock said connector in said casing hanger. An anti-rotation key 50 permits axial relative movement of the split ring 44 and body 12 but prevents relative rotational movement therebetween.

Abstract: A threaded fastener having an axis adapted to thread connect to two bodies for holding such bodies in fastened condition, one body having one thread and another body having another thread,the fastener comprising(a) threading having first and second load flanks which face axially oppositely,(b) said first flank defining a first pitch, and said second flank defining a second pitch, said pitches being different and characterized in that when said fastener is screwed onto body threads said first flank tightens against said one body thread when said second flank tightens against said other body thread.

Abstract: A subterranean well tool such as a packer and attached telescoping seal receptacle assembly is disclosed. The tool is fabricated from a plurality of threaded tubular members and annular deformable rings fabricated of a metal softer than the tubular members are used to establish metal-to-metal sealing integrity between interengagable component members. Upon full engagement, sealing integrity is established along the transverse interface between each tubular member and the deformed seal ring. During initial disengagement, sealing integrity is maintained along a bearing inclined interface between the ring and at least one tubular member adjacent the threaded connection.

Abstract: A pin member with conical thread is threaded into a box or sleeve member having matching conical threading with abutment of the end of the box or sleeve against a shoulder on the pin member; that shoulder is continued into a groove in the pin member receiving a conically distorted polytetrafluoroethylene ring sealingly cooperating with a frustoconical surface of the box or sleeve member near its abutment end. The ring has been placed into the groove after having been heated to a temperature above the crystalline/amorphous transition temperature but below the liquification and decomposition temperatures.

Abstract: A conduit coupling assembly for connecting the end portions of two lengths of conduit in coaxial, abutting relationship. The coupling assembly includes an abutment ring, an outer coupling, retainer means and resilient means. The ring has an internal thread sized for threading onto the end portion of one of the lengths of conduit. The coupling has a first end and a second end with a bore extending therebetween sized to slidably, rotatably receive the abutment ring. The coupling first end has an inside dimension smaller than an outside dimension of the ring so that the ring is unable to move past the first end, and the first end is provided with an internal thread sized for threading onto the ends of the lengths of conduit. The retainer means is carried by the outer coupling adjacent its second end for preventing escape of the ring from the bore.

Abstract: In the preferred embodiment, this invention provides a threaded pipe coupling for connection with a conventional threaded pipe end so as to effect improved sealing against internal fluid pressure and against external fluid pressure as may be required in an oil or gas well. The coupling form causes the thread contact pressure to be greater at the maximum and minimum thread contact diameters than exists at intermediate points along the length of thread contact. An auxiliary plastic seal that will undergo thermal cycling is also provided.

Abstract: A metal-to-metal fluid tight seal configuration formed between two abutting tubular members for use in subterranean oil and gas wells is disclosed. A metal-to-metal fluid tight seal is utilized in a shear release expansion joint assembly mounted by means of an anchor seal assembly in a conventional downhole packer. Sealing engagement is provided by plastic deformation of an annular seal ring between two abutting tubular members which are less ductile than the seal ring. In the preferred embodiment the metal-to-metal fluid tight seal is formed between abutting box and pin tubular members and the plastic deformation of the circular ring occurs as the ring is received within a groove in one of the abutting tubular members which has a dissimilar profile in comparison to the cross-section of the circular ring. Plastic deformation occurs as the box and pin members are rotationally threaded together and a continuous fluid tight seal is maintained along surfaces of both tubular members.

Abstract: A joint for interconnecting a pair of pipes having two-step Hydril-type connection means disposed thereupon. A secondary sealing means is disposed on the pin member connection means within a thread groove which forms part of the seal housing along with pin and box member torque shoulders.

Abstract: A connector assembly 10 including a first member 16, 20 including a first fluid passageway 14, 18 therethrough and a female end portion having a conical surface 22, 58. A connector member 12 includes a second passageway 28 therethrough in fluid communication with the first passageway 14, 18 and a male end portion having a conical surface 30 in mating engagement with the conical surface 22, 58 of the female end portion. The connector member 12 is either directly threaded into the first member 16 or secured to the first member 20 by a nut member 36 to axially urge the conical surfaces 22, 30, 58 into mating engagement. The assembly 10 is characterized by the second passageway 28 within the male end portion of the connector member 12 having an increased diameter defining an annular recessed wall 38 which is outwardly radially deflectable in response to internal pressure applied against the recessed wall to perfect a seal between the conical surfaces 22, 30, 58.

Abstract: A pipeline connector capable of functioning as a buckle arrestor which is a tubular member having two sections with a suitable profile for threaded or collect connection of the two sections in axial alignment with each other. A method of repairing a pipeline having the improved connector of the present invention including the steps of removing the damaged section of pipeline, locating new section of pipeline with collet type connectors on each end in place of the damaged section and connecting the new section.

Abstract: A joint of male and female tubular elements is disclosed where the threads of the female and male members have negative load flanks and have two or more radial steps axially separated one from another by a reverse angle torque shoulder having one or two adjacent conical sealing surfaces. The conical sealing surfaces develop radial positional interference and the reverse angle torque shoulder serves as a positive assembly stop. The negative load flank angle of the threads and the reverse torque shoulder angle combine to interlock the male and female members and to prevent differential radial separation of the engaged conical sealing surfaces when the joint is exposed to internal pressure, external pressure or both. Tapered threads and sealing surfaces and interference threads may advantageously be used in the joint construction.

Abstract: The invention relates to pipe connections satisfying hygienic demands, comprising two members which can be screwed together and a seal ring of plastically or elastically deformable material lying therebetween, and the object of the invention is to prevent the seal ring from being carried along and being displaced during tightening resulting in formation of nooks that might give rise to bacterial growth, cleaning problems and risks of contamination. According to the invention this object is achieved in that a first member has a first bore and a larger diameter second bore connected thereby by a Z-shaped transition, while a second member has an oblique end surface, a cross-sectionally triangular interspace being formed between the oblique end surface and a shoulder of the transition to receive the seal ring and to be filled out practically completely by the seal ring when the members are screwed together, and the seal ring may even protrude to some extent into the through hole.

Abstract: Mechanism for joining together sections of casing or tubing, whereby the exterior ends of adjacent casing or tubing sections and the opposite interior ends of a coupling device are matingly threaded, the threading thereof having plural leads.