Described herein is a gaslight multilayered composite tube having a heat transfer coefficient of >500 W/m.sup.2/K which in its construction over the cross section of the wall of the composite tube includes as an inner layer a nonporous monolithic oxide ceramic surrounded by an outer layer of oxidic fiber composite ceramic, where this outer layer has an open porosity of 5%<ε<50%, and which on the inner surface of the composite tube includes a plurality of depressions oriented towards the outer wall of the composite tube. Also described herein is a method of using the multilayered composite tube as a reaction tube for endothermic reactions, jet tubes, flame tubes or rotary tubes.

The present disclosure relates generally to duct liner insulation products for curvilinear ducts, and more specifically relates to methods and materials to universally fit duct liner insulation for lining oval ducts in air conditioning, heating, and ventilating (HVAC) systems. A duct liner insulation for a curvilinear duct is provided that includes an insulation layer configured to line an interior surface of a curvilinear duct when installed within the curvilinear duct. The duct liner insulation also includes an elastically deformable layer configured to compress the insulation layer against the interior surface of the curvilinear duct when installed within the curvilinear duct such that the insulation layer extends substantially uniformly around an inner periphery of the curvilinear duct.

The present disclosure concerns a pipe structure for high-pressure applications. To provide a pipe structure which overcomes at least one of the disadvantages of the pipes known from the state of the art, it is proposed according to the disclosure that the pipe structure has an inner pipe comprising a metal, wherein the inner pipe has an inner surface and an outer surface, at least one strand which surrounds the outer surface of the inner pipe and has a plurality of yarns, wherein at least one of the yarns has carbon fibres, and a protective pipe surrounding the strand and the inner pipe.

The present disclosure concerns a pipe structure for high-pressure applications. To provide a pipe structure which overcomes at least one of the disadvantages of the pipes known from the state of the art, it is proposed according to the disclosure that the pipe structure has an inner pipe comprising a metal, wherein the inner pipe has an inner surface and an outer surface, at least one strand which surrounds the outer surface of the inner pipe and has a plurality of yarns, wherein at least one of the yarns has carbon fibres, and a protective pipe surrounding the strand and the inner pipe.

A prefabricated composite concrete element for use in a corrosive sewer environment. The concrete element has a hollow reinforced cast concrete portion with at least one end having connection details, a premolded corrosion resistant inner plastic liner. The plastic liner lines an interior of the hollow concrete element and the connection details to provide abutting liner faces in an assembled joint to limit exposure through said joint of said concrete portion to corrosive materials arising in said sewer environment. At least two prefabricated composite concrete elements may be assembled end to end at a joint to form a concrete sewer system. Also disclosed are a method of prefabricating such a composite concrete element.

A method for manufacturing composite tubing, conduit, pipes, and piping. The method includes providing an inner sleeve, an outer sleeve, and a reinforcement sleeve; inserting the inner sleeve into the reinforcement sleeve; placing the outer sleeve around the reinforcement sleeve; inserting a first piston into an inlet end of the inner sleeve; introducing resin between the inner and outer sleeves; inserting a second piston into the inlet end of the inner sleeve; applying motive fluid pressure, such as air pressure, at the inlet end of the inner sleeve, causing the second piston to translate along the inner sleeve, further causing the first piston to translate along the inner sleeve; whereby translation of the first and second pistons along the inner sleeve causes the resin to be impregnated into and around the reinforcement sleeve, resulting a composite final product. The impregnated reinforcement sleeve is then cured.

A method for manufacturing composite tubing, conduit, pipes, and piping. The method includes providing an inner sleeve, an outer sleeve, and a reinforcement sleeve; inserting the inner sleeve into the reinforcement sleeve; placing the outer sleeve around the reinforcement sleeve; inserting a first piston into an inlet end of the inner sleeve; introducing resin between the inner and outer sleeves; inserting a second piston into the inlet end of the inner sleeve; applying motive fluid pressure, such as air pressure, at the inlet end of the inner sleeve, causing the second piston to translate along the inner sleeve, further causing the first piston to translate along the inner sleeve; whereby translation of the first and second pistons along the inner sleeve causes the resin to be impregnated into and around the reinforcement sleeve, resulting a composite final product. The impregnated reinforcement sleeve is then cured.

A fiber reinforced polymer composite pipe includes first and second ends and defines a central axis running in a longitudinal direction from the first end to the second end, and the pipe including at least one non-linear portion along the central axis between the first end and the second end. A first material extends continuously from the first end to the second end, the first material being a fiber reinforced polymer material comprising fiber reinforcement in a polymer matrix and having an electrical resistivity determined by an electrically conductive fiber reinforcement and/or an electrically conductive additive in the polymer matrix; and a second material arranged at the at least one non-linear portion and extending discontinuously between the first end and the second end, and has an elastic modulus greater than the elastic modulus of the first material in the longitudinal direction.

A passivating flexible insulation blanket positionable about a pipe includes an insulation core, an enclosing fabric, and a non-consumable passivator. The insulation core is substantially hydrophobic and includes a microporous material. The enclosing fabric fully encapsulates the insulation core to form a capsule or pouch about the insulation core. The non-consumable passivator is non-consumable such that there is no appreciable change to a mass of the non-consumable passivator after an extended time of activation. The non-consumable passivator is deposited into the insulation core and has a composition soluble in water. The non-consumable passivator includes a leachable component that leaches from the insulation core and is capable of neutralizing acidic components. The leachable component is water soluble and is capable of reacting with a surface of the pipe to form a protective coating on the pipe to aid in inhibiting corrosion formation on the surface of the pipe.

A method to manufacture a tubular element for transferring abrasive materials such as concrete, inert materials or suchlike, wherein the tubular element comprises an internal tubular component made of chromium carbide or other wear-resistant material, and an internal tubular component in contact with and coaxial to the internal tubular component and made of composite material.