Abstract: A weld connection joining abutted ends of pipe includes a heat limiting sleeve therein which provides a continuous seal to protect the weld and the interior portions of the pipe from the materials passing through the pipe. The sleeve may be configured from a non-metallic material, such as PTFE, and a plurality of seal rings may be located on the outer circumference thereof to seal the sleeve to the interior surface of the pipe. The non-metallic sleeve is inherently non-corrosive, and therefore no secondary protective coatings need be provided on the interior surfaces of the pipe connection to protect the weld. To position the sleeve in the pipe ends, and to properly position the pipe ends for welding, the sleeve includes a plurality of removable spacer pins thereon which are removed from the sleeve before the weld connection is completed.

Abstract: A flexible metal piping assembly includes a body with corrugations having spiral (helical) or annular configurations. End connections are mounted on the body ends, which can be flanged or male-threaded. A layer of insulating or sealing material can be applied over the body. The end connections can be male-threaded or female-threaded. A bellows configuration is provided with annular corrugations which taper in proximity to the body ends.

Abstract: An in-ground installed pipe system, laid in expansive type soils, that has a plastic-like wrapping of the main pipe area and a plastic-like covered cushion layer of the joint connections, to provide protection to a pipe system against pipe movement and joint connection disruption, during the swelling and shrinkage process of the surrounding expansive soil, during seasonal variations of moisture content of the soil. The plastic-like wrapping of the pipe section is usually installed prior to installing the pipe into the trench. The plastic-like covered cushion layer is installed around the pipe joint connection, in the trench, after the pipe is installed into the end of the previously laid pipe section.

Abstract: A measuring tube for a flowmeter. The measuring tube is lined with a tubular lining of thermoplastic material, particularly PTFE or PFA, which comes into contact with the measured substance which flows through the tube. The ends of the tubular lining are flanged around end flanges of the measuring tube after the ends of the tubular lining have been plasticised by heating. The plasticised ends of the tubular lining are turned outward by more than 90.degree. and then forced into undercuts in the end faces of the end flanges. Upon cooling, the ends of the lining are in intimate contact with the end faces of the end flanges and the undercuts in the end faces.

Abstract: A cylinder valve outlet includes a bore with a large cylindrical entry leading to a tapered seat. A nipple with a cylindrical neck is fit into the large diameter entry of the bore of the valve outlet. The nipple further includes an arcuately convex mating end for seating in the conically tapered seat of the valve outlet. A seal enhancer is between the valve outlet and the nipple. The seal enhancer is generally tubular with opposed leading and trailing ends and a cylindrical section therebetween. The leading end is tapered for engagement between the tapered seat of the valve outlet and the mating end of the nipple. The trailing end of the seal enhancer is flared outwardly. The seal enhancer is shorter than the mating portions of the nipple so that the outwardly flared trailing end is visually readily apparent. The outwardly flared trailing end also facilitates separation of the seal enhancer from either the nipple or the valve outlet when the gas cylinder is being replaced.

Abstract: A mechanical coupling device for connecting together two aligned fiberglass reinforced plastic duct sections, each having a terminal end portion of equal diameter, so as to form a leak proof joint that is resistant to fire and also chemical corrosion from gases and/or condensate within the duct sections is disclosed. The device comprises elements that cover and seal the terminal end portion of each said duct section; a central gasket member that covers the end elements and extends around the terminal end portions of the duct sections; a flexible metal sleeve member that surrounds the central gasket member; and tightening devices on the sleeve which compress the central gasket member and hold the aligned adjoining duct sections together to provide a leak-proof joint. The tightening devices are spring driven so that if the bulk of the gasket member is reduced due to fire, the sleeve will maintain a firm non-slip hold on the duct joint.

Abstract: Insulated flexible metal piping is provided which includes a metal piping section having inner and outer windings comprising metal bands which are spiral-wound in overlying relation with their leading and trailing edges forming a spiral, interlocked seam. The flexible metal piping section is slidably inserted in an insulating sleeve, which can comprise a plastic material for enclosing the metal piping section. A method of forming the insulated metal piping is disclosed which includes the steps of providing inner and outer spiral windings; interlocking the leading and trailing edges thereof; and slidably inserting a flexible metal piping section formed thereby in an insulating sleeve. Further disclosed is an application of the insulated metal piping in a flue system.

Abstract: A pipe joint capable of transmitting high axial compressive loads includes a reduced wall thickness section at the ends of the pipe to be joined and a coupling sleeve supported in telescoping relation with the reduced wall thickness section. Shoulders formed at the ends of the reduced sections bear against the ends of the sleeve, and the ends of the reduced thickness sections bear against each other so that a portion of the axial compressive load is transmitted through the coupling sleeve and a portion through the reduced thickness sections and a substantially uniform unit stress is maintained. O-rings carried by the coupling sleeve provide a fluid-tight seal between the sleeve and the adjacent surface of the reduced thickness section of the pipe.

Abstract: A coupling assembly having an annular coupling with internal threads having a continuous plastic, corrosion-resistant coating. Opposed tubes are provided with a similar internal coating. The tubes have external threads inserted into the coupling with the internal and external threads being in threaded engagement. An annular gasket is provided of rigid material and is mounted between and in sealing engagement with opposed ends of the tubes within the coupling. The gasket has a continuous radial portion extending between the opposed ends of the tubes and in spaced apart relation thereto. O-rings are in sealing engagement with the tubing ends and the continuous radial portion of the gasket. A pair of opposed flanges extend from opposite sides of the continuous radial portion of the gasket and are in sealing contact with an interior surface portion of the tubes.

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

Abstract: A flexible coupling is provided for two relatively movable pipes, which coupling hasa) a bellows tube having transversely corrugated sidewalls which bellows terminates in two rounded nozzles, which nozzles insert into connecting pipes, (e.g. in the air bypass duct of a gas turbine engine) andb) means to seal each nozzle in each respective pipe such that upon relative axial and lateral displacement between connecting pipes, the bellows tube flexes to maintain the sealed juncture between it and the connecting pipes.

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

Abstract: This invention is a method for joining sections of in-situ cement-mortar lined pipes adapted for high pressure water injection service. The method utilizes a backing ring with one beveled end inserted into a beveled end of the first pipe section and the other beveled end of the backing ring projecting from the first section and adapted to mate with a beveled end of the second pipe section. The pipe sections are then cement-mortar lined. The ends of the linings are then cut back and beveled to facilitate alignment and fit-up, and to provide a cavity and anchor for the retention of a heat expanding grout that is applied to both ends of the lined mating pipe sections to seal the joint. A root opening is left between the mated ends to permit weld penetration and fusion of the butted ends of the steel pipe and a space for the excess and expanding grout to protrude internally.

Abstract: A one piece cast hopper tee having a vertically directed hollow pipe section with a flange at an upper end thereof for attachment to the bottom of a hopper truck. The bottom end of the vertical pipe section flares outward at the juncture with a generally horizontal pipe section creating a generally elliptical opening from the vertical pipe into the horizontal pipe. In the area of juncture between the two pipes smooth and uninterrupted internal transition surfaces are provided to permit complete and continuous flow of product from the vertical pipe to the horizontal pipe. A pair of wear saddles, one on each side of the external juncture of the flared section of vertical pipe with the horizontal pipe create wear resistant areas having approximately double the wall thickness of the pipe sections. A substantially thicker wall section is formed in the horizontal pipe opposite the elliptical opening.

Abstract: A conduit liner having a continuously cylindrical body having a first opening and diametrically opposed second opening, a flange which extends circumferentially around the first opening and which is integrally formed with the body, a hollow interior to encapsulate at least one wire extending through the conduit, and a plurality of flexible and collapsible fins extend along and protrude from an external surface of the body.

Abstract: A method of lining a pipeline 24 intended to carry gas, oil, water, sewage or chemicals in which a cross-linked polymeric liner pipe 10, which has been reduced from its original diameter to a lesser diameter or to a shape of reduced maximum dimension, is pulled through the pipeline 24. The lesser diameter is less than the least inner diameter of the pipeline 24. After the liner pipe 10 has been fully pulled through, the pipe liner 10 is heated by means of a source 60 of visible or infrared radiation forming part of a pig assembly 50 to cause it to revert to the pipeline. The pig assembly or assemblies are stationary at zones 70 where service connections are to be made. Subsequently, the remaining liner pipe 10 is reverted by pulling the source 60 through the liner pipe 10.

Abstract: Pipes to be joined and a pipe coupling have an outer sleeve made of a material optimized for linear and radial strength and positive connection and an inner portion or liner optimized for chemical inertness and the tightness of the connection. The pipes and coupling part are shaped to accommodate a material-correct joining procedure. Compound pipes (1) have a rigid, relatively thin pipe outer sleeve (3) for absorbing and transferring forces and a softer, relatively thin liner or inner pipe (4) to form a tight connection and inert sealing with respect to the rigid outer wall. Like the pipe, the coupling part (2) is made of a rigid joining outer sleeve (5) and a weldable socket (10), preferably made of the same material as the liner (1). Welding energy is introduced electrically.

Abstract: This invention relates to a metal conductor element for improving electrical conductivity between spaced metal faces.

Abstract: A refrigerant transporting hose having a laminar structure including an inner tube consisting of at least one layer, an outer tube disposed radially outwardly of and coaxially with the inner tube, and a reinforcing fiber layer interposed between the inner and outer tubes. The inner tube includes a resin layer formed of a resin composition which consists of a blend of modified polyolefin and polyamide resin, and 1-10% by weight of .epsilon.-caprolactam. A proportion by weight of the modified polyolefin to the polyamide resin is selected within a range between 40/60 and 10/90. The hose may have a sealing layer formed on the inner surface of the inner tube. The sealing layer consists of a chlorinated elastomer containing a dispersion of an acid receptive agent. Alternately, the sealing layer may be provided on the outer surface of a hose connector nipple.

Abstract: A drainage circuit surrounding a hydraulic circuit, such as a circuit for distributing drinking water on an aircraft, includes an element around one enlarged portion (right connector, T, Y connector, etc) of the hydraulic circuit, namely a draining unit (20) formed of two half shells (24, 26) and tubular joining pieces (28). Imperviousness between the two half shells and between the half shells and the joining pieces is ensured by projecting portions (36, 38) which penetrate into a humidity-repellent stabilized gel (40) placed inside receptacles (42, 44). In addition, clipping members (48, 50) are provided on the half shells.

Abstract: A coupled pipe assembly having a pair of opposed, axially-positioned pipes each having opposed beveled ends and interior corrosion-resistant linings. A sleeve having heat-deflecting material is provided axially within the pipes with the heat-deflecting material being positioned adjacent the opposed pipe ends to protect the corrosion-resistant linings from heat damage during welding of the pipe ends. The sleeve has a tapered cross-section extending to and forming a rounded end edge portion.

Abstract: A thermoplastic saddle (6) for renovating or repairing a pipeline (1) with a branch pipe (2). The saddle comprises two saddle parts (20, 22) being movable with respect to each other. The first saddle part (20) comprises a flexible saddle plate (6') and a first connecting part (21) being integral therewith. The second saddle part (22) comprises a branch (8) provided with a second connecting part (23). The part (21) tapers towards its open free end (12') and the second connecting part has a spherical circumference (23a). The position of connecting parts (23, 23a) with respect to connecting part (21) ensures that branch (8) is retained in connecting part (21) if said branch is subjected to pulling forces. In a renovated or repaired pipeline (1) the saddle is fixed by fixing means preferably an expanded plastic fixing sleeve (13). However, fixation by a glued connection (112) and/or sealed connection (113) is also possible.

Abstract: Galvanic isolation between two fluid-conducting members made of dissimilar materials is provided by a coupling pipe that separates the two members (e.g. a pipe and a valve). The coupling pipe includes a tubular section and two flange sections, which mate with the two fluid-conducting members. An insulating liner on the inside diameter of the tubular and flange sections of the coupling device extends the entire length of coupling pipe and is coextensive with flange insulators that separate the coupling pipe from the two fluid-conducting members. The substantial separation distance provided by the coupling pipe with continuous insulation prevents or significantly reduces electrochemical corrosion.

Abstract: A spring connecting or adapted to connect the cut-off ends of an exhaust pipe, particularly of a tractor or the like, after it has been cut in two. The spring is preferably welded at each end to a corresponding end of the exhaust pipe cut in two, or, when an adapter or flared connector pipe is used at each end, the adapter or flared connector pipe is so welded. A flexible liner hose may be used and may have each adapter embedded in it. Each adapter may have a notch or V-cut in it at each cut-off end of the exhaust pipe.

Abstract: An improved gas riser comprises a pipe nipple, casing, adaptor sleeve, tube, and stiffener. The adaptor sleeve features an internal stop which accurately positions an end of the plastic tube before the tube is plastically deformed into grooves in an internal surface of the adaptor sleeve. Each of the first and second ends of the adaptor sleeve can be manufactured in different diameters to fit pipe nipples and casings that are required by different code regulations.

Abstract: A hose coupling, and method of constructing same, for sealably interconnecting a flexible hose and a rigid center pipe. The hose coupling is assembled without requiring relative rotation between the rigid center pipe and the inner surface of the flexible hose.

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

Abstract: A wear resistant pipe elbow is provided having a seamless inner liner with an upstream beveled end directing fluid flow away from the interior surface of the pipe elbow, thereby protecting the interior surface of the pipe elbow from abrasive particles contained in the fluid, and a downstream beveled end, which assists in directing fluid flow away from the inner surface of downstream pipe sections. The pipe elbow may also include a particle trap cavity, which traps particles suspended in the fluid flow. The trapped particles act as a buffer between a portion of the interior surface of the pipe elbow and particles subsequently carried in the fluid flow, thereby additionally protecting a portion of the interior surface of the pipe elbow from abrasion.

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

Abstract: Methods and apparatus for improved containment, detection, and monitoring of leaks of piped substances in which piping systems are constructed of connections of flanged, plastic-lined concentric pipe segments, these segments each having an inner and outer shell with an annulus therebetween and an aperture connecting the annulus with the exterior flange face of the pipe segment. A connector is described which may be placed between pipe segments to be connected and which has annular resilient sealing members and inner plastic seals to provide seals at the connection. The piping system provides an annular containment passageway to capture fluid escaping from the inner shell of a pipe segment and communicate the fluid to a fluid detection port in the connector. The annular containment passageway comprises at least one pipe segment annulus, at least one aperture in the pipe segment, and an annular fluid opening at the connector to communicate fluid toward the fluid detection port.

Abstract: A connecting element including an annular sleeve that has a self-supporting inner wall and a flexible outer wall, and a space between the inner and outer walls for introducing a preferably hardenable free-flowing filling medium into the connecting element to expand the connecting element radially outwardly to contact surfaces of adjacent pipe structures. A feed opening is provided in one of the inner wall and the outer wall to provide access to the space between the walls to permit introduction of the filler material. The connecting element is particularly suitable for sealing the joint between a multi-walled main pipe and a branch pipe extending from the main pipe.

Abstract: A double-layer pipe bend for a pipeline includes an inner pipe of cast steel, an outer pipe of weldable steel surrounding the inner pipe, and connecting flanges at the ends of the pipe bend. The connecting flanges are welded to the outer pipe. The inner pipe and the outer pipe are formed such that a pressure-compensating layer can be formed by the transported medium between the pipes. Another pressure-compensating layer can form between an inner wearing ring and an outer coupling ring of each connecting flange. The wearing ring and, thus, the inner pipe, is axially secured by a groove in the wearing ring and a radial collar in the coupling ring.

Abstract: A method for joining bimetallic tubulars and a bimetallic tubular weld configuration which ensures both a continuous corrosion resistant inner lining across the joint as well as the required mechanical strength.

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

Abstract: An article for joining in end-to-end relationship two or more tubular articles such as pipe sections, and particularly pipe sections coated on their inner and outer surfaces with an electroless metal such as nickel and adapted for passing corrosive liquids and solids includes a ring-shaped member having a meltable coating, on its surfaces intended to engage the ends of the tubular articles and the inner surface of the tubular articles at their junction, and having a flange on its outer circumference that is of a shape and size adapted to engage and seat upon the inner surfaces of the tubular articles to be joined in end-to-end relationship. Welding material is placed in a chamfered region formed at the outer edge of two tubular articles at their ends, joining the two tubular articles in end-to-end relationship with the ring-shaped member between them, and melting the coating into the junction between those ends, and into the interface between the flange surface and the inner surfaces of the tubular articles.

Abstract: A roll grooved pipe is provided on its inner surface with a hydrofoil surface providing a transition between the inner surface of the pipe and the radially innermost portion of a radially inwardly extending step formed in the inner wall of the pipe by the cold rolling of the groove in the pipe.

Abstract: A fitting for connection to the end of a pipe lined internally with a compressible lining with which the fitting is to form a seal a portion of which lining extends beyond the end of the pipe, comprises a collar 1 having an internal wall adapted to fit over the end of the pipe 4 and to sleeve the portion 8 of the lining 6 and means 2 adapted to clamp a circumferential portion of the lining 6 to the adjacent internal wall of the collar 1.

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

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

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

Abstract: The present invention provides an outlet connection for use in a lined basin. A structural steel basin, usually part of a cooling tower, includes a fiberglass reinforced polyester liner. Such liner is desired to provide corrosion resistance and watertightness to the steel basin. The outlet connection includes a piping section of cylindrical shape affixed to a backing plate. The piping section passes through an opening in the liner, with the backing section and another backing plate holding gaskets compressed against the liner. The piping section extends through an opening in a basin wall section, and a closure plate is affixed to the basin wall section. The closure plate also has an opening corresponding to the outer surface of the piping section, and is held to the piping section along the sides of said opening by welding or other similar means.

Abstract: A connecting structure of resinous double pipes, having an external pipe and an internal pipe coated on an inner surface of the external pipe. The connecting structure comprises respective ends of opposite two external pipes; respective U-shaped ends of opposite two internal pipes; a clamping member for sealing and fixing a side of the U-shaped end enclosing the end of the external pipe; a joint ring disposed between respective ends of two double pipes opposite each other, having the same outer diameter as the external pipe; a joint socket mounted on an outer surface of a pair of the double pipes jointed by the joint ring; a bead retaining gap formed between an inner surface of the joint socket and the clamping member; and a gasket disposed between a bottom of the U-shaped internal pipe and the end of the external pipe.

Abstract: A pipe connection having a protective interior coating, with the integrity thereof being maintained during assembly of the pipe connection by welding. This is achieved by the use of a heat deflecting material that prevents damage to the interior coating from heat generated incident to welding at the weld-affected zone. During assembly of the pipe connection, mating, coacting compressible materials are brought into engagement and thereby compressed to ensure a fluid barrier along the pipe connection after assembly by welding.

Abstract: A method of making a flanged pipe length includes flaring a metal pipe by rotating a grooved tool about the inside of the pipe and introducing a plastic tubular sleeve into the pipe. The tubular sleeve is subsequently heated and forced against the flanged portion of the metal pipe whereby the plastic material assumes a shape complementing the projections formed by the grooved tool.

Abstract: A conduit elbow assembly has a radially split outer housing and a replaceable liner. The liner fits loosely within the housing so that material flowing in the elbow accumulates in the void formed in the housing. The hardened liner is thus reinforced, rendering both inner and outer liner hardened surfaces usable in resisting abrasive attack prior to liner failure. A removable housing member exposes the liner for cutting during replacement. Holes in the outer housing permit leakage of fluent material upon liner failure, thus indicating the need for repair prior to conduit rupture. The assembly is adaptable to accommodate varying pipe dimensions within a particular nominal pipe size.

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

Abstract: A method which is easy to carry out for connecting domestic drainage conduits to collector sewers uses a special sealing sleeve, comprising a tubular, externally cylindrical body, the one side of which is closed by a thin elastic diaphragm, and on the other side of which, opposite the diaphragm, an outwardly projecting bead is mounted, and the inside wall of which forms essentially two stepped cones, the wall thickness increasing toward the diaphragm. The domestic drainage pipe, together with the sealing sleeve, is inserted in the collector sewer from the outside. The sealing sleeve allows a repair of defective domestic drainage conduits without extensive earth works.

Abstract: A lined pipe has a continuous impervious coating of an elastomer extending along the inner periphery of the pipe and along the radial end surfaces thereof, and a portion thereof extending over the outer surface of the pipe which progressively decreases in thickness to zero thickness at a position underlying a sealing lip of an elastomeric gasket to be associated with the lined metal pipe.

Abstract: A method an apparatus are shown for forming a flange on an end of a plastic pipe liner of the type used to line a tubular member. A reinforced disc having a rigid portion and an elastomeric portion is placed about the liner exterior and moved into position flush with the flanged end of the tubular member. A retaining ring is placed about the reinforced disc and the disc and liner exposed end are heated to render the materials malleable. A forming unit is then used to apply force to the liner to flow the liner into a reformed shape having a greater external diameter than the remainder of the liner. The forming operation also bonds the reinforced disc to the reformed liner end to further resist any tendency of the liner end to be retracted into the interior of the tubular member.

Abstract: The spigot joint for metallic pipes, particularly for liquids comprises a protector for the lining of the pipe. The protector is associated with an end portion of the outer surface of the pipes.