Abstract: A hydropneumatic pressure accumulator, in particular a pulsation damper, includes an accumulator housing (2) and a movable separating element (20), which separates a pressurized working gas-containing gas working space (24) from a fluid chamber (22) in the accumulator housing (2). A gas storage chamber (12) is provided, which contains an additional volume of the pressurized working gas, and is connected via a connecting path (30) having a throttle point to the gas working space.

Abstract: The invention relates to line elements (600) consisting of a multi-layer inner element (IE) and an outer element (AE), wherein the inner element (IE) and the outer element (AE) are in contact with each other at points, at lines, over part of the surfaces thereof, or over the full surfaces thereof. Furthermore, a frictional contact protection means extending over the component length is provided, or a frictional layer (121) is provided in the contact region of the inner element (IE) and the outer element (AE). The wear of the outer element (AE) caused by friction can thereby be minimized.

Abstract: A clean out notification disc is placed in a clean out underneath a clean out cover to provide a durable notification mechanism of certain conditions of a main sewer line, such as, for example, the existence of a sewer liner, a backflow valve or a grease trap.

Abstract: The present invention provides a multi-layer hose comprising a cover layer, comprising a first polymer, an enhancement layer comprising woven filaments, and an inner lining, comprising a second polymer, wherein the first polymer and the second polymer are dissimilar. The first polymer is preferably a polymer with good wear resistance properties, e.g., thermoplastic polyurethane (TPU), TPU/PVC, or PVC, or PVC/NBR. The second polymer is preferably a polymer with good chemical resistance properties, e.g., ethylene propylene diene monomer (EPDM) rubber. The present invention also provides a method of manufacturing said multi-layer hose.

Abstract: The invention provides an HVAC duct having an inner composite tube and an outer composite tube. The inner composite tube has an interior metal wall, a primary foam wall, and an exterior metal wall. The outer composite tube has an interior metal wall, a secondary foam wall, and an exterior metal wall. In certain embodiments, the inner composite tube is nested inside the outer composite tube in an end-offset configuration. In these embodiments, the first end of the duct defines a male detent having a radially-outward-facing metal engagement face projecting beyond the interior metal wall of the outer composite tube, whereas the second end of the duct defines a female detent having a radially-inward-facing metal engagement face projecting beyond the exterior metal wall of the inner composite tube. Also provided is an HVAC ductwork assembly wherein two ducts of the described nature are connected in an advantageous end-to-end manner.

Abstract: A duct plug for use with a duct opening of a heating, ventilation or air conditioning duct system comprises a first frame member, a second frame member, and a filter member disposed between the first frame member and the second frame member. The first frame member is releasably coupled to the second frame member.

Abstract: A double wall steel tube includes an inner tube wall and an outer tube wall. The inner and outer tube walls are formed from a tubing material including an inner layer of iron steel, first and second outer layers of an alloy of aluminum and silicon, a first intermediate layer disposed between the inner layer and the first outer layer, and a second intermediate layer disposed between the inner layer and the second outer layer. The first and second intermediate layers include aluminum, silicon and iron. The inner and outer tube walls are brazed together.

Abstract: A rigid pipe-in-pipe structure for subsea transportation of fluids includes inner and outer pipes defining a thermally-isolating annulus between them. Thermal insulation material is disposed in the annulus. The outer pipe is of metal, preferably carbon steel. The inner pipe is a polymeric composite structure of bonded layers including a first, radially outer tubular polymeric electrically insulating layer, which can be of pure polymer, surrounding a second, composite layer including carbon fibers, preferably continuous fibers, embedded in a polymer matrix. Conveniently the second layer is a heating layer in which the carbon fibers conduct electricity to heat the inner pipe. The inner pipe can also comprise a radially inner tubular polymer layer within the second composite layer.

Abstract: A flexible pipe body and method of producing a flexible pipe body are disclosed. The method includes providing one or more composite filament (302) as a filament bundle (310); applying a braid element (304) around the filament bundle as a braided bundle (310); helically wrapping the braided bundle (310) around a flexible pipe layer (502); and then curing (510) the one or more composite filament (302).

Abstract: The present techniques are directed to a flexible pipe. An inner carcass layer forms the innermost layer of the flexible pipe. An inner sheath layer and an outer sheath layer are disposed externally of the inner carcass layer. A layer of corrosion resistant alloy is disposed at any location between the inner carcass layer and the outer sheath layer. At least one armor layer is disposed internally of the outer sheath layer.

Abstract: A flexible hose assembly includes a flexible fluid permeable annular carcass arrangement having an inner and an outer diameter formed about a central axis. The carcass arrangement provides skeletal strength to the hose assembly against radial forces. The carcass arrangement has a plurality of interconnecting strips forming convoluted joints between the strips. The convoluted joints have an inner lip and an outer lip at opposite ends of the strips; and the carcass further comprises a plurality of channels formed along an entire length of first and second sides of the strips, the channels creating at least one fluid passage in each of the convoluted joint forming the carcass for the passage of fluids between the inner and outer diameters.

Abstract: The invention relates to a flexible pipe carcass comprising a flexible tubular wall structure comprising a helically wound wall strip; wherein interlocking sections of successive windings of said wall strip form the wall structure. The interlocking sections of adjacent wall strips define a length and are movable with respect to each other between a first position and a second, extended position for changing said length, the interlocking sections being formed such that in the extended position a carcass gap is provided between adjacent interlocking sections for accommodating relative movement there between upon flexure of the wall structure. An insert profile is located in the carcass gap of the tubular wall structure on an inside of the wall structure to at least partly cover the carcass gap.

Abstract: An outer casing for a control cable 10 has an inner tube 12, which includes a crystalline resin, and an outer tube 14, which includes an outer resin layer 16 covering the outer periphery of the inner tube and, in the outer resin layer, includes plural metal wires 18 buried in parallel with the axial direction of the inner tube and at equal intervals in the circumferential direction of the inner tube.

Abstract: A flame resistant hose assembly is disclosed. The hose assembly comprises a tubular inner layer and a flame resistant layer. The tubular inner layer has an interior radial surface and an exterior radial surface and defines a longitudinal axis. The flame resistant layer is disposed about and covers the exterior radial surface of the tubular inner layer. The flame resistant layer is formed from a flame resistant material comprising a polymeric binder and expandable graphite in an amount of from about 5 to about 40 parts by weight based on 100 parts by weight of the flame resistant material. The flame resistant layer expands when heated to a temperature of about 220° C. or greater and maintains a post-expansion coverage of the exterior radial surface of the tubular inner layer of greater than about 95%.

Abstract: A composite pipe and method of manufacture comprises an inner core coated with a resinous material, a prepreg material helically wound about the inner core and an outer shell covering the wound prepreg materials. The materials are applied at preselected melt temperatures to assure coherence among the materials and preclusion of voids and/or annuli therebetween. The melt temperature of the inner core is greater than the melt temperature of the coating and prepeg layers such that the heating needed to cohere these materials has no deleterious effect on the integrity of the inner pipe core. A cooling of the inner pipe core during initial application of the tape layer of prepreg materials stabilizes the radial configuration of the pipe core during tape wrapping and thus the appearance of undesirable voids and/or annuli in the composite pipe mass.

Abstract: A duct of the present invention includes a pair of groove-shaped members which are formed of sound absorbing sheets and a pair of flange portions which are formed of parts of the pair of groove-shaped members that are extended outward from groove opening edges and which are joined in an overlaid state on each other when the pair of groove-shaped members are arranged such that groove openings are opposed to each other. The pair of flange portions includes a seal portion which is formed by crimping the sound absorbing sheets in parts of the flange portions along the groove opening edges and an outer thick portion which is extended outward from the seal portion and which is formed of the sound absorbing sheet thicker than the sound absorbing sheet of the seal portion.

Abstract: An adapter for joining a sprinkler to a pipe element has a body with outer flat surfaces and grooves that receive seals. A plug for sealing a pipe element has a cylindrical body with a circumferential groove which receives seals. Both the adapter and the plug fit within the pipe element and are secured and sealed by a deformation formed in the pipe element by a circumferential groove. The deformation mechanically engages the grooves in the body of the adapter and the plug.

Abstract: An exhaust system for a vehicle includes a heat insulation coating layer formed on an inner wall surface of an exhaust gas flow tube through which exhaust gas passes. The heat insulation coating layer includes an inorganic binder including two or more silicon-based compounds and an aerogel dispersed in the inorganic binder, includes 5 to 50 parts by weight of the aerogel for 100 parts by weight of the inorganic binder, and has heat conductivity of at most 1.0 W/mK, measured by ASTM E1461.

Abstract: The invention relates to a protective sheath (50) for covering a fluid-transporting pipeline, comprising a flame-proof, non-inflammable layer (52) and a heat insulation layer (54) arranged beneath the non-inflammable layer, the non-inflammable layer consisting only of carbon and the heat insulation layer comprising a knitted fabric, the knitted fabric comprising a plurality of stitches and air trapped within the plurality of stitches such that the heat insulation layer comprises at least 70 vol. % of air. Furthermore, the non-inflammable layer comprises carbon fibers providing 100% coverage in order to protect the heat insulation layer from contact with flames.

Abstract: A large-aperture spiral welded steel pipe with metal linings and a manufacturing method thereof, wherein the pipe includes a pipe body spirally winded by a main steel belt; a first lining and a second lining are arranged on a body inner wall, the first lining is spirally laminated on the main steel belt surface, the first lining width is smaller than the main steel belt width, the second lining is spirally laminated on a spiral seam formed between adjacent pipe bodies, the second lining left and right sides are respectively welded with the adjacent first lining, and the first lining and the second lining cover the inner wall of the entire body; and a reinforcement ring with a semi-closed section is spirally arranged along a body outer wall, and a spiral passage is formed between the inner wall of the reinforcement ring and the body outer wall.