Abstract: A connection structure between an aluminum alloy drill pipe body and a steel joint of an aluminum alloy drill pipe includes a first joint at an end of the aluminum alloy pipe body and a steel second joint; wherein the first joint includes a first external threaded section and a second external threaded section provided from outside to inside thereof, and a major diameter of the first external threaded section is smaller than that of the second external threaded section; and wherein the second joint includes a first internal threaded section which is able to be fitted with the first external threaded section and a second internal threaded section which is able to be fitted with the second external threaded section, and a pitch diameter of the second external threaded section is larger than that of the second internal threaded section.

Abstract: A method of cold rolling a thread on a tubular support member of a rotary shouldered thread connection includes obtaining an original root depth of a thread root, cold rolling the thread until a minimum increased root depth tolerance is achieved. The thread may be cold rolled with a wheel tip having an elliptical profile.

Abstract: A composition for solid coating formation, includes a mixed solvent including water and a dipolar aprotic solvent, a powdery organic resin which is partially soluble at least in the dipolar aprotic solvent. The powdery organic resin is dissolved or dispersed in the mixed solvent.

Abstract: A landing pipe includes a first tool joint, a second tool joint, and a main section extending from the first tool joint to the second tool joint, the main section having a first portion and a second portion. The first tool joint outer diameter is greater than both the main section first portion outer diameter and the main section second portion outer diameter. The main section first portion wall thickness is greater than the main section second portion wall thickness, and the main section second portion has a length range of 40% to 85% of an overall length of the landing pipe.

Abstract: An assembly for producing a threaded connection, including tubular components provided with continuous threaded zones, in the form of helixes each provided with a first and a second taper generatrix, each of the threaded zones defining a thread profile, viewed in a longitudinal section passing through the axis of revolution, provided with load flanks, stabbing flanks, thread crests, and thread roots, wherein the height of the threads of the first threaded zones and the height of the threads of the second threaded zones are each in the range 1 mm to 2.5 mm, and the angle of the load flanks of the first and second threaded zones with the normal to the axis of revolution is in the range 1 to 20 degrees, and the angle of the stabbing flanks of the first and second threaded zones with the normal to the axis of revolution is in the range 3 to 25 degrees.

Abstract: A joint for pipes includes male and female portions, trapezoidal threads at taper sealing and bearing end surfaces, with slope angles between thread lead-in flanks and the thread axis normal line of 10-24° and between load flanks and the thread axis normal line of ?4° to +5°. The bearing end surfaces have a 10-20° slope angle from the thread axis normal line. There is 13-18° slope angle between the male portion sealing surface and thread axis normal line, and an 8-12° slope angle between the female portion sealing surface and thread axis normal line. The female portion thread run-out area and mating areas of the sealing and the bearing end surfaces have circumferential grooves. The female element sealing surface and circumferential groove surface and the male portion sealing surface and thread run-out surface are rounded.

Abstract: A threaded connection for use on oil field tubular. The connection has a dual tapered thread comprising a dual helical thread having a first, straight threaded portion and a second, angled portion, the threaded connection comprising a pin connection and a box connection both of which have thread-free sections. The thread-free section on the pin and the box are comprised of frustoconical surfaces and cylindrical surfaces. The thread-free section of the pin in addition to having a frustoconical surface and a cylindrical surface has an annular, radially outwardly radiused protrusion which, when the box and the pin connection are made-up is in interference engagement with the frustoconical surface in the box.

Abstract: A tubular threaded joint has a pin and a box. Each having a contact surface comprising a threaded portion and an unthreaded metal contact portion including a seal portion and a shoulder portion. A solid lubricating coating having a relatively high Knoop hardness is formed on a portion including the shoulder portion of the contact surface, such as the unthreaded metal contact portion including the shoulder portion and the seal portion, of at least one of the pin and the box. A solid lubricating coating having a relatively low Knoop hardness is formed at least on the remaining portion of the contact surface, such as the threaded portion. The threaded joint has excellent galling resistance, gas tightness, and rust preventing properties. The joint does not readily undergo yielding of shoulder portions even when made up with a high torque, thereby making it possible to perform makeup in a stable manner.

Abstract: A threaded joint for an oil country tubular goods includes pins each of which occupies a pipe end portion of a steel pipe for an oil country tubular goods, and includes an externally-threaded portion, a nose extending toward a pipe end side from the externally-threaded portion, and a shoulder forming a distal end of the nose; and a box including internally-threaded portions each forming a threaded portion by being threadedly joined with the externally-threaded portion, and shoulders brought into contact with the shoulders of the pins, wherein the pins and the box being joined to each other by the threaded joining so that portions between the threaded portions and the shoulders are brought into metal-to-metal contact with each other to thereby form seal portions at the contact portions, and the shoulders of the pins and the shoulders of the box forming shoulder faces are brought into contact with each other at the time of make-up of the threaded joint, and a ratio of a chamfer length of pin thread to a thread

Abstract: A drill string for drilling a subterranean wellbore includes a shaft connectable to a first drill string portion and a housing connectable to a second drill string portion. A torque relief section is disposed between the shaft and housing. The torque relief section includes a slip section operable to slip and release torque buildup when torque applied between the shaft and housing exceeds a threshold torque. The threshold torque of the torque relief section is selected to be within the range of about 110% and 150% of the operating torque and below the peak operating torque for the drill string.

Abstract: A method of testing for leakage of a pulp chamber in a modified extracted tooth is provided, wherein the modified extracted tooth comprises enamel, dentine and a pulp chamber. The method comprises: (a) providing an extracted tooth which has been modified by removal of roots and dental pulp so as to create a pulp chamber, the pulp chamber having an opening at one end thereof, which opening is defined by a rim; (b) attaching a first end of a first tube to the rim of the pulp chamber so as to provide an air-tight seal between the first tube and the rim; (c) placing the modified extracted tooth into a liquid; (d) supplying a compressed gas into the pulp chamber via the first tube; and (e) determining visually whether or not bubbles of the gas are released into the liquid at the enamel of the tooth.

Abstract: In a double-shoulder threaded tool joint connection, the pin external threads and the box internal threads have a thread taper between 0.75 inch per foot and 1.0 inch per foot. The pin external threads and the box internal threads have equal stab flank and load flank angles, and are in a range from thirty-three to thirty-nine degrees. Both the pin external threads and the box internal threads have roots formed in a shape of a portion of a circle tangent to both thread flanks with a minimum radius of 0.063 inch. The pin external threads and the box internal threads are in the range of two to three per inch. The box counterbore has a length of 0.750 or less. The pin nose has a length in a range of 30% to 90% of the length of the box counterbore.

Abstract: A threaded connector that includes a pin end having external threads and a box end having internal threads that are complementary to the external threads has a thread profile that defines at least a portion of either or both of the internal threads and the external threads. The thread profile may include a thread root connecting a first flank to a second flank and the thread root may be at least partially defined by a plurality of tangentially interconnected radii. The plurality of radii may include at least a medial radius, a first distal radius on one side of the medial radius, and a second distal radius on the another side of the medial radius. The medial radius may be larger than the first and the second distal radius. Alternatively, the thread profile includes a thread root connecting a first flank to a second flank that is at least partially defined by a plurality of radii, each radius having a different length and each defining a circular arc.

Abstract: A retractable sample scoop is shown that is mountable to a pipeline for taking samples from the pipeline. A retractable mounting mechanism mounts to the pipeline wall. A tubular is extendable into the opening of pipeline and retractable from the pipeline. A first seal creates sealing around the tubular portion with respect to said pipeline while permitting insertion, retraction and rotation of said first tubular portion with respect to said pipeline. A second seal comprises a tubular without threads to pipe connector with threads.

Abstract: Medical devices and methods for making and using the same are disclosed. An medical device may include a medical device for renal nerve ablation. The medical device may include a catheter shaft having a distal region. An expandable balloon may be coupled to the distal region. An electrode assembly may be coupled to the balloon. The electrode assembly may include a first electrode pad including one or more electrodes. The first electrode pad may have a first lead-in edge, a first protruding edge, and a first transition region with a continuously changing curvature disposed between the first lead-in edge and the first protruding edge.

Abstract: Methods, devices, and systems of downhole tools are disclosed. The tools each has a sleeve attached to a mandrel to form a composite frac or bridge plug or similar coupling to a downhole tool tubing product without the use of shear pins. The engagement between the mandrel and the sleeve includes a load breaking ledge, threads, ring and groove combination, and helical spiral groove with a helical coil.

Abstract: A tubular threaded joint is constituted by a pin and a box each having a contact surface comprising an unthreaded metal contact portion including a seal portion and a shoulder portion and a threaded portion. Of the contact surface of at least one of the pin and the box, the surfaces of the seal portion and the shoulder portion has a first lubricating coating in the form of a solid lubricating coating, and the surface of the threaded portion or the entire surface of the contact surface has a second lubricating coating selected from a viscous liquid lubricating coating and a solid lubricating coating. The first lubricating coating has a coefficient of friction which is higher than that of the second lubricating coating, and the second lubricating coating is positioned on top in a portion where both the first lubricating coating and the second lubricating coating are present.

Abstract: A threaded joint for heavy-walled oil country tubular goods can both ensure sealability and prevent galling in a state where a high external pressure is also applied to the threaded joint in addition to a high compressive force. A surface of a pin side forming a seal portion and a surface of a box side forming a seal portion are formed into a convex curved surface and a tapered surface, respectively. A seal thickness ts of the pin is 15 mm or less, a shape parameter ts/D (D: outer diameter of a pin raw pipe portion) is 0.045 or more, and a complete thread length ratio L/t (L: complete thread length of the pin, t: wall thickness of the pin raw pipe portion) is 4.0 or less.

Abstract: A magnet assembly (200) is provided that comprises a magnet keeper (204) configured to hold at least one magnet (202). The bracket (208) is configured to receive the magnet keeper (204) and also configured to be attachable to a flowmeter (5) sensor assembly (10). A first surface (216) is formed on the magnet keeper (204), and a second surface (218) is formed on the bracket (208), wherein the first and second surfaces (216, 218) are configured to mate so to provide a radial alignment of the magnet keeper (204) that is within a predefined radial tolerance range.

Abstract: An expandable tubular for use in a wellbore includes: a pin formed at a first longitudinal end of the expandable tubular; a box formed at a second longitudinal end of the expandable tubular; a tubular body connecting the pin and the box; and an elastomeric seal disposed in a groove of the box. Each of the pin and box has: a torque shoulder; and a thread. The pin has an asymmetric protrusion formed on an inner surface thereof.

Abstract: A casing joint assembly includes a casing joint having an upper end and a lower end, and an upper coupling joint having a first portion coupled to an upper casing section and a second portion coupled to the casing joint at the upper end. A joint interface secures the first portion to the second portion. The first portion is made of a first material and the second portion is made of a second material dissimilar to the first material, and an inner coating is applied on an inner radial surface of the upper coupling joint and extending axially across the joint interface.

Abstract: A threaded coupling for joining tubulars for oil and gas field operations forming connected tubulars. The threaded coupling has a body with an outer surface, an inner surface and a central axis, a first tapered edge, a second tapered, and a first coupling bearing face and second coupling bearing faces for supporting load, weight, or both on the connected tubulars. As the inner surface of the body is swaged onto each tubular, the inner surface of the body deflects away from the central axis, providing a plurality of bands of high contact pressure for each metal to metal seal between the inner surface of the body and each connected tubular to sustain seal pressures between the threaded coupling.

Abstract: A tubular component for a drill stem, for drilling a hole, the component including a first end section including a first threading, a second end section including a second threading, and a substantially tubular central section, a hole being provided in at least one of the first and second end sections, and a tensioner for a communications tube disposed in the hole, the tensioner operating by deformation of a regular section of the communications tube, the tensioner being disposed in a housing provided in at least the section, at a distance from the ends of the communications tube, the housing intersecting with the hole.

Abstract: A threaded connection for pipe or tubulars used in drill strings, casing, or production tubing. The threaded connection can have a box connector with box threads having a plurality of box thread teeth and a pin member with pin threads having a plurality of pin thread teeth. The teeth can have a crest, a load flank, a stab flank and a root. A restriction can be between the pin member and the box connector on the stab flank, wherein the restriction does not touch the pin member, and the restriction forms a first channel and a second channel for containing a thread sealing compound.

Abstract: An example double shoulder threaded tool joint connection includes a pin with external threads formed between a pin external shoulder and a pin nose. The tool joint also includes a box with internal threads formed between a box face and a box internal shoulder. The box internal shoulder may have a different pitch that the pin external shoulder. The internal threads and the external threads may be arranged and designed for connection with each other so that the box and the pin are connected with a common center-line and with a primary seal formed by the pin external shoulder forced against the box face and a secondary seal formed between the pin nose forced against the box internal shoulder.

Abstract: A threaded connection for engaging a first tubular and a second tubular with a threaded coupling. The threaded coupling has mill end teeth and field end teeth. Each tubular has a pin connector. The threaded coupling receives and engages both pin connectors. The threaded coupling has a controlled phase or a phase difference that limits the axial advancement of the pin connectors past a coupling midpoint. The threaded coupling has a relief groove that reduces the hoop stress if the mill end pin end and the field end pin end are not centered correctly at the coupling midpoint. The threaded coupling has a metal barrier formed by the phase difference and length of the screw thread helices which limit the axial advancement of each pin connector.

Abstract: A threaded casing connection and a thread pipe connector for connecting casing segments or tubing segments joined using a threaded connection. The threaded connection having a threaded coupling for engaging a mill end connector and a field end connector. The threaded connector has a metal barrier for accommodating any phase difference and length of the screw thread helices which limit the axial advancement of each pin connector with the threaded coupling.

Abstract: A method of conducting a surgical procedure including implanting an anchor into a bone, wherein the anchor comprises a receiving portion and a screw, the screw including a screw head contained within the receiving portion and pivotally engageable with a surface of the receiving portion, and wherein the receiving portion and the screw comprising a different material. The method further includes selecting a rod from a group of rod types and coupling the rod with the receiving portion to stabilize a position of a portion of the spine.

Abstract: A threaded joint for a pipe is disclosed in which scalability, compression resistance, and galling resistance are enhanced. The threaded joint includes a pin nose outer peripheral surface that forms an outward convex curve in an axial cross-sectional view; the convex curve is such that a composite R curve, in which a plurality of outward convex arcs having different radiuses of curvature are connected in sequence to a generating line of a cylindrical portion next to a male member, is curved such that the radiuses of curvature increase with distance from the male member and tangents on connection points of the arcs are aligned with those of corresponding arcs connected thereto; and the inner peripheral surface of a box component facing the pin nose is a tapered surface that interferes with the pin nose outer peripheral surface when connected to a pin component.

Abstract: An expandable pipe section, intended to be joined with a corresponding pipe section for use in connection with a well casing of a production well for hydrocarbons, where the pipe section is configured to be screwed on or off an adjoining expandable pipe section, the pipe section at one end being provided with a male end having externally arranged threads and where the adjoining expandable pipe section is provided with a correspondingly shaped female end having corresponding internal threads. The distance between adjacent threads at their widest point is less than the maximum width of a thread. Those parts of the pipe being provided with threads are provided with at least two step wise arranged parts with a cylindrical surface being coaxially arranged with the pipe wall(s).

Abstract: A tubular connection includes a pin member having external wedge threads configured to engage a box member having corresponding internal wedge threads, and a solid lubricant coating applied on at least one of the internal and external wedge threads wherein the solid lubricant coating comprises a first uniform layer of a dry corrosion inhibiting coating made of an epoxy resin containing particles of zinc and a second uniform layer of a dry lubricant coating covering the first uniform layer.

Abstract: A connection is established between a pin connector and a box connector defined on a pair of tubular members such as casing segments in the field of oil and gas recovery. The pin connector and box connector include features for the protection of metallic-sealing surfaces during assembly, disassembly, transport and handling of the tubular members. The pin connector includes a stabbing flank with an inwardly tapered annular flank surface thereon, and an alignment protrusion extending outward with respect to the pin-side metallic sealing surface in a direction normal to a cone angle defined by the inwardly tapered annular flank surface. The alignment protrusion engages internal surfaces of the box connector to concentrically align the pin connector with the box connector, and thereby protects the metallic sealing surfaces from damage that might otherwise result from collisions between the pin connector and the box connector.

Abstract: Underground drilling operation often requires connecting a drill tool (e.g., drill bit, backreamer, etc.) to a drill string. It is desirable to connect the drill tools to a drill string in a manner that facilitates quick and easy assembly and disassembly. Low torque coupling, commonly referred to as “torque-less” connection, can provide such functionality. The useful life and strength of such connections can be improved upon. The present disclosure provides a low torque coupling with improved strength and durability.

Abstract: A threaded joint comprises a coupling, a first pin, and a second pin, wherein the thread of the first pin has a pitch different from the pitch of the thread of the second pin. The extremities of the pins have slanted contact surfaces of complementary shape that make mutual contact after make-up of the joint. The slanted common plane of contact of both pins has an angle to the plane perpendicular to the longitudinal axis of the joint which is greater than 0°. In an alternative embodiment the contact surfaces of the pins are split into two staggered planes and comprise a seal in-between.

Abstract: A drill pipe made according to one embodiment includes a number of serially connected tubulars with a communication device placed between the connecting ends of the tubulars, wherein the communication device provides a direct data communication link between the adjoining tubulars.

Abstract: An interlock pipe joint includes a first and second tubular member. In some embodiments, an interrupted thread box and pin make up the interlock pipe joint. In other embodiments, a stepped interrupted thread box and pin make up the interlock pipe joint. In other embodiments, a twist-lock box and pin make up the interlock pipe joint. In some embodiments, an external or internal bushing is provided. In a method of operation, the first tubular member is inserted into the second tubular member by an axial insertion followed by a rotation to lock the pipe joint.

Abstract: Provided is a threaded joint for steel pipes having high sealability even under a bending load. In the threaded joint, when a pin 3 and a box 1 are threadedly connected with each other, the outer peripheral face of a nose 8 of the pin and the inner peripheral face of a nose of the box are in metal-to-metal contact with each other at a contact portion and the contact portion serves as a seal portion 20. A threaded portion, at which the externally threaded portion 7 and the internally threaded portion 5 are threadedly connected with each other, has a negative load flank angle ?, shoulder portions 12 and 14 have a negative torque shoulder angle ?, and the ratio L/d0 of a length L of the nose and a pipe outside diameter d0 is equal to or higher than 0.08.

Abstract: A threaded pipe connection is shown which features a pressure energized flex-seal structure. The connection includes a first box member having a box end, the box end having an end opening defining an interior surface with internal threads, the internal threads being defined by crests and roots and opposing flanks. A second, mating pin member has a pin end with a pin nose, the pin end having an exterior surface with mating external threads, the external threads also having crests and roots and opposing flanks, at least selected ones of which move into engagement with the internal threads of the box when the connection is made up. A flex-seal region is located on either the box and interior surface or the pin end which forms a primary containment seal upon make up of the connection.

Abstract: A pipe joint comprises a pin having a male screw-threaded portion and a box having a complementary screw-threaded portion. The threaded portions of the pin and box inter-engage along the greater part of the axial length of the threaded portions, the male thread extending to a male stop shoulder adjacent a complementary stop shoulder on the other portion. The pin further comprises a radial surface adjacent a corresponding radial surface on the complementary stop shoulder of the box, a curved sealing surface of the radial surface on the pin sealingly engaging a corresponding curved sealing surface on the corresponding radial surface on the complementary stop shoulder. Each of the curved sealing surfaces is so shaped to lie on an arc of a separate ellipse. The parameters of the ellipses are carefully chosen to maximize the strength and robustness of the seal.

Abstract: A tubular connector connects two tubulars of a string of tubular members. The tubular connector has a pin end tubular member having an axis and a pin end. A pin end flange is positioned on an outer diameter of the pin end and has an undercut adjacent the union of the pin end flange with the pin end. The tubular connector also has a box end tubular member having a box end. A box end shoulder is adjacent the union of the box end with the box end tubular member. The box end shoulder has an undercut thereon. The pin end is secured to the box end so that the pin end tubular member and the box end tubular member are joined, stresses applied to the pin end tubular member and the box end tubular member are distributed through the undercuts.

Abstract: A broach style anti-rotation device for connected tubular members is described. In embodiments, the broach tool is inserted into a slot in an outer diameter surface of the pin, and teeth of the broach, which have a successively greater height when moving from the front to the tail of the broach, cut a slot in a surface of the box. Sidewalls of the broach and its teeth engage shoulders of each slot to prevent the rotation of the tubular members relative to each other.

Abstract: An apparatus is disclosed that forms a piping thread form of four threads per inch pipe (TPI). The thread form is configured to have a load flank, a load flank angle, a stab flank, a stab flank angle, a crest, and a root. Hydrostatic pressure tests using the 4-round thread form at pressures of 4,500 psi and greater resulted in failures due to thread leaks. Tensile tests using the 4-round thread form at loads of 187,400 lbs. and greater resulted in shearing at forces of 3,535 psi and greater.

Abstract: The invention provides a connector assembly for interconnecting tubular elements. The connector assembly comprises at least one pin member, at least one box member, and for each box member a respective coating layer. Each pin member has a threaded outer surface and each box member has a threaded inner surface allowing the pin member and the box member to be screwed together. Herein the respective coating layer is positioned between the threaded surfaces of the pin member and the box member. Each coating layer is of a softer material than said threaded surfaces. The connector assembly further comprises means for removing excess coating material during make up of the pin member and the box member.

Abstract: A threaded connection includes first and second tubular components each with an axis of revolution. The first component including a male threaded end, the second component including a female threaded end, and both the male and female threaded ends finishing in a terminal surface. The threaded zones include, over a portion defined as in a self-locking make-up, threads, which before the self-locking make-up and when viewed in a longitudinal section passing through the axis of revolution of the first and second components, each include: a thread crest, a thread root, a load flank, and a stabbing flank. A width of the thread crests of each component reducing in a direction of the terminal surface of the component under consideration, while a width of the thread roots increases. A lead of the male stabbing flanks and/or load flanks is different from a lead of the female stabbing flanks and/or load flanks.

Abstract: Herein disclosed is a mechanism for providing high load capabilities in downhole locations. The mechanism comprises tubulars, at least one of which is constructed from composite; and the tubular composite being for high load capabilities in connecting the tubulars. In some cases, there are at least two tubulars in the mechanism. In some cases, the mechanism comprises a thread form, which thread form is mounted to translate an axially directed force into a radially directed force. In some cases, the high load capabilities include a load bearing flank angle of 15° to 50° as measured from the axis of said tubular. In some cases, the high load capabilities include a clearance flank angle of 15° or less as measured perpendicular to the axis of said tubular. In some cases, at least one of the tubulars includes a thread pitch, having from 2 to 12 threads per inch.

Abstract: A threaded tubular connection includes a first body terminated by an external abutment, and linked to a male threading prolonged by a terminal portion forming an internal abutment surface at its axial end, such that the connection includes a second body defining a bearing surface for the external abutment at one free end, and including an initial portion on its internal surface connecting the bearing surface to a female threading, made up onto the male threading, and terminating in an internal shoulder facing the internal abutment, such that the linking profile between one of the following: the external abutment, the internal abutment, the bearing surface, and/or the internal shoulder, has a profile with a variable diameter in cross section, over a length of the body which is less than the terminal portion or initial portion.

Abstract: A pipe connection includes a tubular box having an internal threaded section extending from a rim, and a nose receptacle area joining the threaded section. A box seal surface is formed on the nose receptacle area. A tubular pin has a nose area extending from a pin end, and an external threaded section joining the nose area, the external threaded section mating with the internal threaded section. An annular groove is formed on the nose area between the pin end and the external threaded section. A pin seal surface is located at least partially in the groove for engaging the box seal surface to form a metal to metal sealing engagement.

Abstract: Ends of separate tubular members used in oil and gas drilling are connected pin-to-pin by a threaded coupling and made leak tight by an internal pressure seal, wherein the male or field end pin of a first tubular member has an integral geometry designed to mate with the female or mill end pin of a second tubular member. The coupling and tubular members possess a modified buttress thread form having a negative load flank angle and a positive stab flank angle. When assembled, the coupling connects the field end pin of the first tubular member with the mill end pin of the second tubular member, wherein integral geometries of the mated pin ends generate the interference necessary to produce a single, metal-to-metal, leak-tight, internal contact pressure seal. An external ball and cylinder contact seal at each end of the coupling provides additional sealing capacity when used in combination with the internal contact pressure seal.

Abstract: A threaded joint for steel pipes having excellent galling resistance, rust preventing properties, and airtightness without using a compound grease comprises a pin and a box each having a threaded portion and an unthreaded metal-to-metal contact portion serving as contact surfaces. The contact surfaces of at least one of the pin and the box are coated with a multi-layered structure comprising, from the bottom, a first layer formed from a first metal or alloy, a second layer formed from a second metal or alloy which is softer than the first metal or alloy, and an uppermost layer of a solid lubricating coating comprising a lubricating powder in an organic or inorganic binder.

Abstract: A corrosion resistant coupling assembly for two glass-lined, premium threaded pipe joints, the coupling assembly having opposed liner end wedge flanges that engage and trap a compressible, reinforced polymeric ring disposed between them, wherein the compressible ring has a wedge-shaped cross-section with oppositely facing, oppositely inclined side surfaces, so that each oppositely inclined side surface contacts and abuts against an oppositely disposed, cooperatively inclined surface of a liner end wedge flange to provide a corrosion-resistant barrier between the two pipe joints when the pin end and the box end are threadedly engaged and tightened to compress the polymeric ring.