Abstract: A diffusion-tight fluid conduit for hydrocarbon-containing fluids has a corrugated pipe of corrosion-resistant metal with a corrugated inner side and a corrugated outer side, wherein the outer side is exposed. An inner pipe of plastic material is arranged inside the corrugated pipe and has a smooth inner side and a smooth outer side. A first coupling member is seal-tightly connected by material bonding to a first end of the corrugated pipe.

Abstract: A multilayer pipe for hydrocarbon-containing fluids, particularly fluids for internal combustion engines, includes at least four coextruded layers, wherein a first layer contains essentially polyamide and a second layer contains essentially a polyolefin copolymer. For improving the diffusion blocking capability, particularly relative to gasoline, and a higher thermal stability, a third layer contains essentially a thermoplastic polyester and a fourth layer contains essentially a thermoplastic etherester elastomer (TEEE) or a thermoplastic polyester elastomer.

Abstract: A multilayer fluid conduit for use in motor vehicles includes a first layer and a second layer surrounding the first layer. The two layers are essentially composed of thermoplastic materials and are integrally connected to one another. Electrically conductive particles are mixed into the plastic material of the first layer. For increasing a long-term elasticity and flexibility even at higher temperatures of up to 90° C. when coming into contact with a liquid fuel and fuel vapors, the plastic material of the first layer is a functionalized cross-linked polyolefin or a functionalized cross-linked thermoplastic elastomer.

Abstract: A multilayer pipe is composed of at least three layers, wherein at least two of the layers are based on thermoplastic polyester, one layer is harder than the other layers, at least one of the other layers contains a thermoplastic polyesterelastomer. For preventing brittling of the material of the multilayer pipe, the radially innermost contains at least one of the materials polyolefin, polyolefin copolymer, polyolefin terpolymer, grafted polyolefin and polyamid, and at least one of the layers is modified against thermal aging.

Abstract: A fuel or fuel vapor fluid conduit includes a first thermoplastic material including a thermoplastic polyester elastomer. A second thermoplastic material includes a thermoplastic polyester having higher bending and flexibility than the bending and flexibility of the first thermoplastic material. The second material has a lower tensile strength and impact strength than the tensile strength and impact strength of the first material.

Abstract: The present invention provides a multilayer tube comprising (a) a first outer thermoplastic layer and (b) a second inner thermoplastic diffusion barrier layer which is directly bonded or fused to the first layer by a material-to-material bond. The second layer has a thickness of from about 0.1 to about 0.6 mm. At least one layer of the multilayer tube has an elongation value at break of at least about 130%. Also, at least one layer of the multilayer tube includes a heat stabilizer. The multilayer tube of the present invention is able to withstand 1,000 hours or more of contact with fuels without the layers delaminating. Furthermore, the multilayer tube is able to withstand 1,000 hours or more in an antifreeze mixture of 5 to 50 percent by volume of methanol in water at from about −20 to about 80° C. without the layers delaminating. The multilayer tube of the present invention does not require an intermediate bonding or primer layer to join the thermoplastic layers.

Abstract: Pursuant to the invention, this objective is accomplished by a multilayer flexible conduit for combustible liquids, particularly for fuels, with an outer layer, an inner pipe and an intermediate layer between the outer layer and the inner pipe. The outer layer comprises a halogen-free and phosphorus-free thermoplastic material. The intermediate layer is made of synthetic fibers that are resistant to high temperatures, a fire-resistant textile yarn or metal fibers. The inner pipe has at least one diffusion-tight layer of a thermoplastic material.

Abstract: The present invention is a thermoplastic pipe nipple for connecting a flexible fluid conduit to a tank, comprising a first elongated tubular portion with a first end for engaging the conduit, and a second end for engaging a second portion of the nipple. The second portion is attached to the tank. The first part preferably consists of a reinforced polyamide, and the second part preferably consists of a non-reinforced high density polyethylene. The first part has a lower tendency to deform under load than the second part.