Abstract: A wellhead assembly is provided including a casing and a tubular member mounted over the casing. A flange extends from the tubular member. A generally elongated annular member is provided in the tubular member. The generally elongated annular member has a first end portion above the tubular member and second end portion below the first end portion. A seal is formed between the second end portion and the tubular member. A hanger may be suspended within the tubular member. In such case, a seal may be formed between the elongate annular member and the hanger.

Abstract: An integrated casing spacer and joint restraint unit is attached to each of a pair of pipe sections adjacent to an end-to-end connection of the pipe sections by means of first and second spacer/retainer ring members. Disposed on the outer periphery of each ring member in a spaced manner are plural risers each having a respective runner disposed on its outer end for engaging an inner surface of an outer casing and maintaining fixed spacing between the inner pipe sections and the outer casing. Plural paired risers, with one riser disposed on each ring member, are aligned with one another along the axis of the connected pipe sections and are each adapted for secure connection to a respective connecting rod for securely coupling the two ring members together and restraining relative movement between the two pipe sections.

Abstract: A jacketed pipe flange (10) for connection to an end of an inner pipe (12) and to an end of a jacketed outer pipe (14) surrounding the inner pipe includes a central throughport (16) for mating with the inner pipe. The first annular sealing surface (18) surrounds a central throughport for sealing fluid within the inner pipe, a second annular sealing surface (20) surrounds the first sealing surface, and a third annular sealing surface (22) surrounds the second annular sealing surface for sealing fluid in the jacketed outer pipe from the exterior of the flange. An annular gap (24) separates the first and second sealing surfaces, and a test port (26) fluidly connects the annular gap with an exterior port in the flange. A plurality of axially extending throughports (34) in the flange between the second and third sealing surfaces pass fluid through the jacketed outer pipe and the flange to downstream components.

Abstract: A fluid piping system and pipe spools are provided. The fluid piping system has at least one pipe spool. The pipe spool has an inner wall and an outer wall with at insulating area defined at least in part by the inner and outer wall. The insulating area of the pipe spool acts to isolate any leak of cryogenic fluid in the pipe spool.

Abstract: A bulkhead assembly for a pipe-in-pipe system includes coxially inner and outer components which are screwed together along a first threaded portion and a locking device which includes a locking element screwed onto a threaded portion on one of the components having threads running opposite to the threads on the first threaded portion. One of the components further includes a radially extending abutment shoulder at an end of the first threaded portion away from the second threaded portion which abuts against the other component.

Abstract: A coupling for a double tube is configured to connect with the double tube. The double tube includes an outer tube for a first fluid to flow therethrough. The double tube includes an inner tube provided inside of the outer tube and having an end protruding from the outer tube, the inner tube for a second fluid to flow therethrough. The coupling includes a branched portion brazed to an end of the outer tube and brazed to an end of the inner tube, with the end of the inner tube protruding outside through the branched portion. The branched portion is formed as a curved tube having a curved portion. The branched portion has an end joined to an end of the outer tube, with the curved portion having a through-hole for the inner tube to pass therethrough.

Abstract: Described are embodiments of a pipe fitting or connector. The fitting may be used as an atomic element in constructing a variety of different structures, such as shelving formed from pipes, rods, tubular structures and the like that may be connected using a pipe fitting. The pipe fitting may include a punched hole in a top portion and a matching punched hole in a corresponding bottom portion of a sleeve into which a pipe may be inserted. The holes may be used as a visual indicator that the pipe is fully inserted in the fitting. The holes in the top and bottom portions of the sleeve may also be used with a fastener to securely hold an inserted pipe in place by passing a fastener through the holes in the top and bottom portions of the sleeve and also passing the fastener through corresponding holes in the inserted pipe.

Abstract: A flowhead for a well testing system is disclosed. The well testing system comprises a plurality of threaded connection pipes extending from the surface to a subterranean zone of interest which is isolated for testing purposes. Fluid flows from the subterranean zone into the flowhead and is directed to a flare and related measuring instrumentation. The flowhead includes a swab inlet with a swab valve, a kill line with an associated valve and a flow line with an associated valve. The line connecting directly to the well preferably comprises an outer swivel element integral with a body of the flowhead and a roller bearing supported inner swivel element rotatably mounted therein.

Abstract: A joint for joining a double pipe, which is provided with an outer pipe for transfer of a first fluid, and an inner pipe for transfer of a second fluid. The joint is provided with a flange including a first through bore and a second through bore, a branch portion and a connection pipe having a first end and a second end, the first end being brazed with the inner pipe of the double pipe and the second connection portion being inserted into the second through bore and defining a second portion for connection of the second circuit pipe, whereby the connection pipe transfers second fluid between the second circuit pipe and the outer pipe of the double pipe. The branch portion is provided with a first connection portion for connection of the first circuit pipe, the first connection portion being inserted into the first through bore.

Abstract: An embodiment of the invention is a piping system including a fluid impermeable sleeve having a plurality of longitudinal, spaced ribs formed on an interior surface of the sleeve. A fluid carrying tubing is positioned internal to the sleeve. A coupling has a first end and a second end, the first end having interior threads engaging an outer surface of the sleeve. The coupling has a vent opening in fluid communication with the interior of the sleeve.

Abstract: A system for making and breaking connections between the pin ends of sucker rods and coupling sleeves employs a hydraulically powered system of radially driven gripper heads which are interchangeable to accept different sucker rod sizes. A torqueing system adjacent the gripper head system is also hydraulically driven, employing a pivotally coupled free end on a torque wrench which engages the wrench flat on the sucker rod at its opposite end. The coupling is securely retained without marring the coupling surface while the torque necessary to make or break the connection is applied rapidly and controllably. The system can also be used to advantage in preassemble sucker rods into couplings with precise prestress, using an improved connection design. A sucker rod string can then be assembled readily in the field with invariant optimum prestress conditions at each connection.

Abstract: A pre-formed insulation module is disclosed having a part cylinder body. The body includes an unstriated insulation layer formed of a rigid insulating material substantially uniform in composition and density over its cross section. The insulation layer has an inner surface adjacent to a surface of a component to be insulated, and an outer surface generally concentric to the inner surface. A substantially non-fibrous resilient cladding layer shaped to the body is directly adhered to the insulation layer at the outer surface. Connection means are disposed along the length of the body for connecting with a further insulation module, wherein the insulation and cladding layers of each module are brought into relative contact along the contacting surfaces of the modules to insulate a portion of the component.

Abstract: A hose-in-hose coupler having a primary or inner hose assembly and a surrounding secondary or outer hose assembly. The secondary hose assembly is connected by opposing retractable sleeves which when disconnected may by retracted or separated to expose the primary hose assembly.

Abstract: A gas service riser assembly and ductile pipe to plastic pipe transition connection is provided. The gas service riser assembly comprises an outer ductile pipe, a plastic pipe having open ends disposed within the outer ductile pipe and extending through one end thereof, a hollow rigid stiffener disposed within the interior of a portion of the plastic pipe within the outer ductile pipe, a gasket positioned around the exterior of the plastic pipe adjacent to the stiffener, and a crimp formed in the outer ductile pipe adjacent to the stiffener and the gasket whereby the outer ductile pipe is compressed against the gasket, plastic pipe and the stiffener to form a seal.

Abstract: A slurpie hose connection, for attachment between the coaxial hose and the back end of a fuel dispensing nozzle, including two parts, a connector part that fits within the back end of the nozzle, a hose part that secures with the leading edge of the hose, such that when these two parts are brought together, and pushed into sealed engagement, a nut is fastened within the back end of the nozzle, to tightly and snuggly secure the hose connection together, available for prompt usage. A slurpie tube may fasten to tube fittings and extend forwardly in the nozzle, as known, and extend to the bottom of the coaxial hose, to act as a slurpie to remove any accumulated or condensed fuel, from this location, and to prevent its blockage of the return of vapors to the dispenser and for underground storage.

Abstract: A fluid line assembly is disclosed that includes an outer fluid line and an inner fluid line disposed substantially within the outer fluid line. The inner and outer fluid lines each include a slip joint. In an embodiment of the invention, at least one of the slip joints includes a reservoir in communication with the interior of the corresponding fluid line. Among other things, the reservoir is suitable for receiving fluid from the corresponding fluid line as the fluid line assembly is contracted and expelling fluid into the corresponding fluid line as the fluid line assembly is extended. In another embodiment of the invention, the inner and outer fluid lines include a ball joint assembly.

Abstract: A fluid vent (26) for venting fluid from the annulus between the inner surface of a rigid conduit (20) and the outer surface of a conduit liner (10). The fluid vent (26) consists of a length of rigid conduit (34) containing a multiplicity of apertures (32) extending through the wall of the conduit and arranged in an annular pattern around the circumference of conduit (34). The fluid vent (26) further comprises means defining a closed annular volume (36) extending around the exterior circumference of the conduit (34) and interconnecting the outer ends of the apertures (32) with at least one fluid outlet passage (40) located on the exterior of the conduit (34) and communicating with said annular volume (36). The fluid vent can be used to expel water or other liquids from the annular space when retro-fitting a liner to a conduit, venting gas which has permeated through the lining into the annulus, or for assisting in the movement of fluid through the annulus.

Abstract: The invention relates to a device for using various types of coupling system to connect together a tube (2) and a filter housing (3). According to the invention, the device comprises: a head plate (21) independent of the type of coupling system, the head plate being fixed to the housing (3) and being provided with passages (22) opening out into a bearing face (23) of the head plate; for each backing-plate (Pi) of given type, a first bearing face (25) complementary to the bearing face (23) of the head plate (21) and a second bearing face (29) adapted to co-operate with a flange (B1) of corresponding type; a sealing gasket (28) interposed between the first bearing face (25) of a backing-plate (Pi) of a given type and the head plate (21); and releasable connection means (30) between the head plate (21) and each backing-plate (P1) of a given type in order to provide sealing between them.

Abstract: A bulkhead assembly for a pipe-in-pipe system is disclosed, the assembly comprising an outer piece (26) and an inner piece (20) which can be screwed together along a first threaded portion (32), and further comprising a locking device (38), characterised in that the locking device (38) comprises a locking element screwed on a second threaded portion (34) having screw threads in a direction opposite to that of the first threaded portion.

Abstract: A fluid piping system and pipe spools are provided. The fluid piping system has at least one pipe spool. The pipe spool has an inner wall and an outer wall with at insulating area defined at least in part by the inner and outer wall. The insulating area of the pipe spool acts to isolate any leak of cryogenic fluid in the pipe spool.

Abstract: A seal arrangement for providing a seal between a nuclear reactor in-core instrument housing and an instrument contained within the housing includes a lower seal assembly surrounding an outer portion of the in-core instrument housing, an upper seal assembly surrounding an outer portion of the in-core instrument, a seal housing enclosing the lower and upper seal assemblies, and lower and upper compression assemblies positioned on respective ends of the seal housing. The compression assemblies each include a drive nut and a compression collar. The compression collars engage and apply an axial load on the seal assemblies to maintain a reliable seal between the seal housing and the outer portion of the in-core instrument housing, and between the seal housing and the outer portion of the in-core instrument.

Abstract: This is a balloon catheter having at least two lumens. One of the lumens is a large working lumen. The balloon catheter is especially useful as a guide catheter and may be used in a variety of therapeutic and diagnostic procedures. In particular, it has value in treating neurovascular embolic strokes in combination with other devices which are delivered to the stroke site through that working lumen. The remainder of the lumens typically are used to inflate and to deflate the balloon. It is highly preferable that the balloon or inflatable member be situated in a recess in the outer wall of the inventive catheter. Additionally, the distal end of the catheter past the balloon is preferably tapered. The catheter has a very low profile as compared to other catheters of the neurovascular balloon catheter genre. It may include other features such as variable stiffness along the axis of the device and anti-kinking components. The balloon is preferably compliant in nature.

Abstract: A Hose-In-Hose coupler having a primary or inner hose assembly and a surrounding secondary or outer hose assembly. The secondary hose assembly is connected by slideable sleeves which when disconnected may by extended or separated to expose the primary hose assembly.

Abstract: A clamp for clamping two concentric tubes, typically two concentric tubes in an oil or gas well. The clamp has two axially movable tapered components which can be pulled over one another in an axial direction to provide a contraction of internal diameter which grips the smaller diameter tube. In one embodiment, a spacer is fitted to allow the tapered components to be held apart until the tubes have been correctly positioned. The spacer is then removed, and the tapered components are drawn together to effect the clamping. A hydraulic ram can be provided to separate the tapered components should readjustment be required. In another embodiment, the larger diameter tube is made with a relatively thin wall, so that it can be distorted inwards to grip the smaller tube.

Abstract: A process for manufacturing a safety hose system. In one embodiment, the process of the present invention comprises the steps of positioning the inside hose with the outside hose; inserting first and second pre-mold inserts about the first and second end portions of the inside hose; attaching the first and second connectors to the first and second end portions of the inside hose to form first and second crimped portions, respectively; applying an adhesive to the first and second crimped portions; inserting the first and second crimped portions into the connector inlet portions of the first and second pre-mold inserts, respectively; inserting the drain hose into the drain hose inlet portion of the first pre-mold insert; molding a first end-cap member to the first end portion of the outside hose, the first pre-mold insert, and the drain hose; and molding a second end-cap member to the second end portion of the outside hose and the second pre-mold insert.

Abstract: A fitting assembly for joining a double containment pipe (DCP), including primary and secondary pipes, to a double containment fitting, including primary and secondary fittings, wherein the secondary fitting has a larger diameter than the secondary pipe. A sealing reducer has a larger diameter end for fitting over the secondary fitting and a smaller diameter end for fitting over the secondary pipe. The sealing reducer is fit over the secondary pipe, the primaries of the DCP and double containment fitting are joined, and then the sealing reducer is positioned over the primary joint and its smaller and larger diameter ends sealed, either by adhesive or a combination of interlocking threaded fitting components and O-rings, to the ends of the secondary pipe and secondary fitting, respectively.

Abstract: A double containment pipe system includes a carrier pipe section having a plurality of radially spaced members fixably connected to and longitudinally extending along an outer surface thereof, a containment pipe section having an inner surface of a diameter to contain said carrier pipe and readily permit movement therein, wherein an annulus is formed between the carrier pipe section and containment pipe section. Further, a plurality of carrier pipe sections as defined and are fixably interconnected and which are operably disposed within a plurality of the containment pipe sections which are removably interconnected. The containment pipe sections are removably interconnected by a quick connect coupling having a clamp configured to sealably enclose and connect adjacent ends of the connecting containment pipes.

Abstract: A connector for connecting the lower tubular member of a tie-back to the upper tubular member of a subsea wellhead is disclosed as having a first sleeve carried about the upper member for axial reciprocation with respect thereto and extension over the lower member, and a second sleeve also carried by the upper tubular member for axial reciprocation thereto within the first sleeve. Each of the tubular members has locking grooves formed about its ends, and a normally expanded lock ring has about its ends to engage the grooves, as well as outer cam surfaces carried within inner cam surfaces on the inner sides of the sleeves for radial movement between a normally expanded unlocking position and a contracted locking position, as the sleeves are axially reciprocated in opposite directions with respect response to one another. A fluid operator is formed between the upper portions of the sleeves for moving them in opposite axial directions.

Abstract: A pipe coupling assembly for double-wall pipe having an interstice between an inner pipe and an outer pipe, which joins the terminal ends of adjacent sections of the double-wall pipe to a fitting element, as a tee or elbow fitting, as well as to a connector tube bypass assembly. The coupling assembly provides fluid communication between the interstices of the adjacent sections of the double-wall pipe and the connector tube bypass assembly but does not permit fluid from the interstices of the pipes to pass through the pipe fitting.

Abstract: A connection device for connecting a submerged tubular structure to a floating support structure. The connection device includes first and second tubular connection elements that connect the submerged tubular structure to the floating support structure. The first tubular connection element cooperates with the second tubular connection element to form a first axial abutment in a pulling direction in which the submerged tubular structure is pulled, and a second axial abutment in a direction opposite from the pulling direction. The device further includes a locking and tensioning device that includes at least one actuator secured to the floating support structure and is mounted to pivot on the second tubular connection element about a hinge axis and against the effect of a return spring surrounding the pin so as to enable the first tubular connection element to snap-fasten onto the second tubular connection element.

Abstract: A quick connect body having first, second and third ports carries an insert extending from the first port to the third port and forming first and second flow paths through the body from the first and second ports, respectively, to concentrically mounted conduits attached to the third port and to one end of the insert. Retainer elements are mounted on the body and/or the insert to sealingly couple first and second conduits to the body and the insert.

Abstract: A safety hose apparatus delivers water from a standard threaded hose bib to an appliance or plumbing fixture. The apparatus includes an outer hose and an inner hose that extends through the outer hose. A first threaded connector is rotatably attached to the outer hose and is in communication with the inner hose. The first threaded connector is threadably engagable with the spout to communicably connect the inner hose to the hose bib. A second threaded connector is rotatably attached to the outer hose and is in communication with the second end of the inner hose. The second threaded connector is threadably engagable with the inlet to communicably connect the inner hose to the inlet. A first closure is engaged with the first end of the outer hose and a second closure is engaged with a second end of the outer hose for sealing the space between the inner and outer hoses and retaining within the space water leaking through a rupture in the inner hose.

Abstract: In the joint 40 for duplex pipes, a clearance between the first outer pipe seal unit 110 and the second outer pipe seal unit 210 is defined larger than a clearance existing between the first inner seal portion 120 and the second inner pipe seal unit 220. Furthermore, the wire diameter of the O-ring 301 which functions as the sealing member for the outer pipe is defined larger than the wire diameter of the O-ring 401 which functions as the sealing member for the inner pipe.

Abstract: A coupling for interconnecting two double-walled pipes, e.g. production filter pipes (10, 12). The coupling may have the shape of a connector (10A, 12A) divided into two parts, each part (10A, 12A) being attachable on the end portion of a double pipe (10, 12), the parts (10A, 12A) of the connector being interconnectable, preferably mutually screwable. Such double pipes (10, 12) have two concentric liquid passages, one through the inner pipe (14) and one through the annulus-like, concentric liquid passage 920) between inner pipe (14) and outer pipe (16). In order not to block the outer concentric liquid passage (20) at the joint place (10A, 12A) so that liquid flowing therewithin must be transferred to said smaller pipe through a valve, longitudinally extending, through-going flowing channels (18) have been formed in the joint area; said channels (18) may be distributed circumferentially, thus allowing continuous flow of liquid past the coupling area (10A, 12A).

Abstract: A double wall safety hose delivers water from a standard threaded hose bib to an appliance or plumbing fixture. The apparatus includes an outer and an inner hose that extends through the outer hose. The inner hose is communicably attached at each end to respective threaded connector. A closure in the form of a ferrule or bushing surrounds and sealably interengages each end of the inner hose. A corresponding end of the outer hose sealably interengages an enlarged outer surface of the ferrule. This seals each end of the safety hose apparatus so that water leaking through a rupture in the inner hose is retained within the outer hose. A drain port attached to the outer hose discharges water that has leaked from the inner hose to a drain line.

Abstract: An improved safety hose apparatus includes an inner hose having threaded connectors attached rotatably at each end thereof. An inner hose is disposed about the outer hose. The inner hose is alternatable between longitudinally expanded and contracted conditions. The outer hose includes a pair of resiliently expandable end coupling portions. Each end portion is selectively expanded to releasably grip the peripheral surface of a respective threaded connector. This seals the end of the apparatus so that water leaking through a rupture in the inner hose is retained within the outer hose.

Abstract: A union for tubes having a first external wall and a second internal wall coaxial with the first to define a chamber around a central duct. The union includes at least two seats for reception each of one end of a tube to be connected. Each seat includes a first surface designed to adhere to an end segment of the first wall of a tube inserted in the seat and a second surface coaxial with the first and designed to adhere to an end segment of the second wall of the tube. Between the first and second surfaces of the union there is a connection surface. The union includes in it first ducts which lead into the connection surfaces to provide connection between the chambers of tubes inserted in the seats and second ducts which lead into spaces circumscribed by the second surfaces to provide connection between the central ducts of the tubes.

Abstract: A double-walled pipe connection for an aircraft fuel line includes a first outer pipe surrounding a first inner pipe, a second outer pipe surrounding a second inner pipe, a pipe coupling joining the inner pipes together, a securing fixture on the first inner pipe, a sleeve-shaped outer pipe bushing bolted to the securing fixture by bolts oriented parallel to a radial direction, and an outer pipe sleeve that is axially slidable over the second outer pipe and onto the outer pipe bushing. The first outer pipe is plugged into the outer pipe bushing, which is plugged into the outer pipe sleeve, which seals onto the second outer pipe. The inner pipe coupling is covered or exposed by axially moving the outer pipe sleeve, while the outer pipe bushing remains bolted to the first inner pipe, and mechanically secured and electrically grounded to a metal structure.

Abstract: A marine riser segment which includes a riser joint having a threaded coupling at each end and flanges disposed on an exterior of the joint. Each of the flanges is coupled to the joint by a bearing. The flanges including openings therein for auxiliary conduits, so that the conduit joint is connectible to another such joint by relative rotation of corresponding ones of the threaded couplings, while the flanges remain rotationally fixed.

Abstract: A coupling assembly includes a first coupling member, a second coupling member, and a coupling nut disposed over a portion of the second coupling member and threadingly engaging the first coupling member to retain the first and second coupling members together. An insulation blanket encloses the coupling nut, and a retention strip having a first end attached to an inner surface of the insulation blanket and a second end attached to the coupling nut is provided to prevent loosening of the coupling nut.

Abstract: A method for installing a ducting system with branches, wherein at the point of a branch in an existing duct of the system a splittable Y-branch connector with an inlet opening, an outlet opening and at least one branch opening is installed by cutting a duct portion from the existing duct at the point of the branch, opening the splittable branch connector and arranging it around a bundle of guide tubes extending between the cut end portions of the duct, and closing and securing the Y-branch connector with splittable coupling collars in such a manner that the inlet opening and the outlet opening engage in sealing manner over the respective cut ends of the existing duct, and the branch opening is secured by engagement of a branch stub around a branch duct through which a branch guide tube is laid.

Abstract: A pipe in pipe assembly. A coupling is used to join the ends of the inner pipe. The inner pipe is centralized within the inner pipe to provide axial resistance but minimum restraint transverse to the axis of the assembly. This provides sufficient flexibility of the inner pipe to accommodate the necessary tolerances to permit the use of the coupling. The inner pipe may be centralized within the outer pipe by the use of foam injected between the inner and outer pipe and a corrugated web sleeve around the ends of the inner pipe. The inner pipe may also be centralized within the outer pipe by the use of a corrugated web bulkhead that fits around the inner pipe and within the outer pipe.

Abstract: A secondary tubing containment system (10) is provided for a discharge tube (18) of a chemical metering pump (14) in a chemical addition system (12). One end of the discharge tube (18) is engaged in a fitting (20) on the metering pump (14), and the other end of the discharge tube (18) is engaged in a fitting (22). The containment system (10) includes a pair of coupling nuts (30, 32), a connector in the form of a Tee (34), two cylindrical tubes (36, 38), a pair of unions (40, 42), and a drain tube (44). The inside and outside diameters of the tubes (36, 38) are sized to allow the tube (38) to be slid or telescoped into the tube (36) to allow the length of the containment system (10) to be adjusted. The union (40) is configured to sealingly engage the tube (38) along the length of the tube (38) to accommodate the adjustment.

Abstract: The present invention is a safety hose system for use in delivering water from a water supply source to an inlet connector of a washing machine. In one embodiment, the system comprises a first connector engageable with the inlet connector of the washer machine and a second connector engageable with the water supply source. The system further comprises a first hose having first and seconds end connected to the first and second connectors, respectively. The system further comprises a second hose disposed concentrically and sealed about the first hose and extending from the first connector to the second connector. The system further comprises a sealing material. The first and second ends of the second hose are molded to the first and second connector, respectively, by the sealing material to form an unitary one piece structure. The system may further comprise an over-spill portion formed by said second hose being disposed about the first hose.

Abstract: The invention relates to a coupling unit for coupling two tubular membrane elements of the kind used in membrane filter technology, forming extensions of one another. The coupling unit comprises a jacket piece which is provided at both its ends with sealing surfaces intended to engage the facing ends of the membrane elements to be coupled thereto. The sealing surfaces may be formed on the interior peripheral wall of the jacket piece to engage the exterior peripheral wall of the ends of the membrane elements. However, the sealing surfaces may also be formed on the cross-cut end surfaces of the jacket piece, and engage the cross cut end walls of the membrane elements. The interior of the jacket piece may comprise an axially extending conduit portion to communicate with corresponding flow conduits in the membrane elements.

Abstract: A connector for tying back a riser from a subsea wellhead to a platform, wherein the wellhead has an internal wellhead housing with external grooves thereon. The connector having a plurality of dog members carried within a cavity which engage the external grooves. The dog members are actuated by axial movement of a piston linked to a cam ring. The connector has a plurality of transfer members located within the cavity to support the dog members and transfer upward loading to the wellhead housing during tension on one side due to bending. Further, the connector has a release ring which forces the dog members out of engagement with the external grooves when the connector is released.

Abstract: A joint 50 for duplex pipes is to connect to a duplex 100 where an outer pipe 101, an inner pipe 102, and ribs 103 are unitized to be the duplex pipe 100 as one body through an extruding process or a drawing process, having a main body 110 which is provided at its one end to an end portion 101a of the outer pipe exposing the inner pipe 102 by partially eliminating the outer pipe 101, a wall face part 112 equipped at the other end of the main body 110 for penetrating the exposed inner pipe 102, and a connecting pipe 120 provided in the opening 113. An opening is formed at places to be determined in response to disposing conditions of the connecting pipes.

Abstract: A service riser 10 comprises a steel jacket 11 around a polyethylene pipe 12 which terminates in the riser at a transition zone 20. The transition zone 20 comprises a retainer sleeve 30 inserted in the end of the pipe 12 and sealed thereto by an O-ring 38. The retainer sleeve 30 extends out of the pipe 12 and is provided with grooves 46 separated by lands 48 on which an elastomeric sealing band 52 is received. The tube 11 is swaged down forming a swage groove 56 around the retainer sleeve 30 compressing the gasket 52 to a large extent over the lands 48 and a lesser extent over the grooves 46, the ideal compression for the gasket 52 being arranged somewhere between such degrees of compression. By this means the ideal degree of compression at some regions of the gasket 52, forming an annulus around the retainer sleeve 30, is guaranteed, despite tolerances in the dimensions of the tube 11 (especially) as well as the band 52 and sleeve 30.

Abstract: A connector for tying back a riser from a subsea wellhead to a platform, wherein the wellhead has an internal wellhead housing with external grooves thereon. The connector having a plurality of dog members carried within a cavity which engage the external grooves. The dog members are actuated by axial movement of a piston linked to a cam ring. The connector has a plurality of transfer members located within the cavity to support the dog members and transfer upward loading to the wellhead housing during tension on one side due to bending. Further, the connector has a release ring which forces the dog members out of engagement with the external grooves when the connector is released.

Abstract: The invention is directed to a double-wall steel pipe joint. Each section of double-wall steel pipe has a steel outer casing and a steel inner carrier pipe. The completed joint comprises a steel joint ring fitted within the annular space at the end of each double-wall steel pipe section. The combination of locking serration and epoxy bonding join and seal the inner steel pipe to the bore of the joint ring, without welding. Welding joins the ends of the sections of outer casing.