The present invention relates to a pipe suitable for conveying fluids in HVACR applications, which pipe comprises an inner tube delimiting an inner space or passageway for a fluid, an insulating cover and an anti-corrosion layer.

A tubing to supply diesel exhaust fluid to an exhaust system of a diesel engine includes an inner layer made of a first material and an outer layer made of a second material. The first material includes polyethersulfone polymer or polyphenylene sulfide. The second material includes a polyamide or polyphthalamide. An outer surface of the inner layer and an inner surface of the outer layer include a reactive material that facilitates bonding between the inner layer and the outer layer of the tubing.

The disclosure relates to a fluid line having a pipe which includes at least two plastic layers. A first plastic layer includes hydrolysis-resistant polyamide 6 (PA6). The disclosure provides a fluid line which may be cost-effective.

The present invention refers to a composite material that comprises carbon fiber or sheet made from polyacrylonitrile (PAN) or lignin being indicated for the manufacture of several articles such as high resistance pressure cylinder. Said material presents several advantages such as, for example, to provide improved screening to the articles that comprise it. The referred composite comprises: a first inner layer of polytetrafluorethylene, covered by a second layer of high-density polyethylene, adhered to a third layer of composite containing carbon fiber or sheet made from polyacrylonitrile (PAN) or lignin immersed in cured epoxy resin from a polymeric matrix and a hardener; and a fourth outer layer of composite, comprising aramid fiber impregnated with a dilating fluid and cured epoxy resin from a polymeric matrix and a hardener.

An apparatus includes a method for providing a Shape Memory Polymer Based Passive Thermal Diode (SMP-PTD) that includes layers and is configured to provide passive heating and cooling of a pipeline. The SMP-PTD includes a polyurethane (PU) layer configured to contact at least an upper portion along a length of a pipe. The SMP-PTD further includes a polyethylene terephthalate (PET) layer configured to surround the PU layer and the length of the pipe. The SMP-PTD further includes a graphene layer configured to surround an upper side of the SMP-PTD and cross layers of the SMP-PTD toward a bottom side of the SMP-PTD to establish contact with the pipe. The SMP-PTD further includes an epoxy shell configured to surround the graphene layer. The SMP-PTD further includes a shape memory polymer (SMP) ring configured to provide vertical displacement and push upward upon lateral displacement from pushing by left and right PET blocks. The SMP-PTD is installed on the pipeline.

The present invention concerns a multilayered pipe comprising an inner basis layer (1) and an outer layer (2), the inner basis layer (1) and the outer layer (2) comprising polypropylene, and with a reinforcement layer (3, 6) reinforced with mineral fibers and located between the inner basis layer (1) and the outer layer (2), wherein at least one layer of the pipe located between the inner basis layer (1) and the outer layer (2) is a barrier layer (3) comprising polyamide.

An insulated conduit for use in offshore, deep water environments includes a pipe and a fluoropolymer composition. The pipe has an outer surface with the fluoropolymer composition disposed about the outer surface of the pipe for providing a thermal insulation layer. The fluoropolymer composition includes a fluoroplastic polymer present in an amount of at least 50 parts by weight based on 100 parts by weight of the fluoropolymer composition. The fluoropolymer composition also includes a fluoroelastomer present in an amount of a fluoroelastomer present in an amount of from about 20 to about 50 parts by weight based on 100 parts by weight of the fluoropolymer composition. The fluoropolymer composition has a thermal conductivity less than about 0.20 W/mK at 205° C.

The present disclosure relates to a fibre reinforced polymer (FRP) tube, the tube comprising a plurality of concentric layers of an FRP material forming a shell of the tube. At least one blind threaded longitudinal bolt hole is provided from a transverse end surface of the shell. The bolt hole extends in at least three of the plurality of layers, a middle layer encompassing a plane passing through a center of the bolt hole, an inner layer encompassing a plane of an innermost extent of the bolt hole, and an outer layer encompassing a plane of an outermost extent of the bolt hole. The fibre filament of each of the inner and outer layers has been wound at a first angle to the longitudinal axis and the fibre filament of the middle layer has been wound at a second angle to the longitudinal axis.

There is provided a multilayered tube for transporting liquid chemicals containing an outermost layer and an innermost layer, the innermost layer containing a polyamide (A), an impact modifier (B), and a carbon nanotube (C), wherein the number of projections each having a height of 5 m or more and a longitudinal width of 20 m or more, which are present on the surface of the innermost layer, is 2 or less per 1 mm.sup.2 of surface area; and the number of agglomerates each having a longitudinal width of 5 m or more, which are present in the cross section of the innermost layer, is 15 or less per 1 mm.sup.2 of cross-sectional area. There is also provided a polyamide resin composition constituting the innermost layer of the multilayered tube for transporting liquid chemicals.

A multi-layered pipe comprising a wall having a polyolefin inner layer and a barrier layer being an outer layer relative to the polyolefin inner layer, the barrier layer being formed of a non-metallic barrier material, which barrier material has relative to polyolefin an enhanced resistance to permeation therethrough of hydrocarbon molecules, the pipe further comprising a protective layer being an outer layer relative to the barrier layer, the pipe further comprising a peelable layer between the polyolefin inner layer and the barrier layer, the peelable layer being formable around the polyolefin inner layer by means of extrusion. The protective layer and the barrier layer may together be incorporated in a single layer.