A double-walled pipe with integrated heating capability for an aircraft or spacecraft includes a pipe body rigidly formed from plastic in one piece with an inner wall, with an outer wall and with a plurality of wall supports, the wall supports connecting the inner wall to the outer wall, the inner wall and the outer wall defining an intermediate space. The double-walled pipe further includes an electrically conductive coating surrounding the inner wall within the intermediate space and configured to heat up under application of an electric current such that heat is transferred to the inner wall.

An electrostatic discharge tubing segment includes a porous non-conductive interior surface and an adjacent conductive polymer portion. The conductive polymer portion is configured to transfer electrostatic charge generated by a charged fluid passing through the tubing segment to ground such that electrostatic discharge can be mitigated.

A composite tube comprises a first tube section 100 and a second tube section, at least one of which is of fiber reinforced composite form, a mating interface being provided on each of the first and second tube sections, each of the respective mating interfaces having an interfering portion to create an interference fit between the first and second tube sections when the composite tube is assembled, each of the mating interfaces being configured with a recess the recesses being alignable with one another, during assembly, to define a combined recess when the composite tube is assembled, into which a hardened settable compound can be disposed during assembly to form an internal locking element that assists the interference fit by mechanically securing together the first and second tube sections.

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 p polymer, surrounding a second, composite layer including carbon fibres, preferably continuous fibres, embedded in a polymer matrix. Conveniently the second layer is a heating layer in which the carbon fibres conduct electricity to heat the inner pipe. The inner pipe can also comprise a radially inner tubular polymer layer within the second composite layer.

There is provided a flow rate adjustment apparatus including a main body inside which a fluid flow passage that guides a fluid has been formed, in which the main body is formed of a conductive fluorine resin material containing a fluorine resin material, and a carbon nanotube dispersed in the fluorine resin material, and in which a volume resistivity of the conductive fluorine resin material is more than 1.010.sup.3 .Math.cm and less than 1.010.sup.4 .Math.cm.

A duct includes a polymeric duct wall that circumscribes a fluid-conveyance passage. The polymeric duct wall includes, relative to the fluid-conveyance passage, an inner surface and an outer surface. An electrically conductive coating is disposed on at least one of the outer surface and the inner surface.

A fluid assembly includes a base and at least one first device. The base includes a single-piece body including a base outlet, a base inlet, and a first interface including a first interface inlet and a first interface outlet. The base also includes a first flow path segment formed within the single-piece body that extends from the base inlet to the first interface outlet. The base also includes a second flow path segment formed within the single-piece body that extends from first interface inlet. The base also includes a ground path disposed within the single-piece body. The first device is attachable to the first interface to fluidly connect a first device inlet to the first interface outlet and a second device outlet to the second interface inlet.

Multi-layered fuel feed pipe, wherein the feed pipe comprises at least five layers with the following layer structure from the inside to the outside: an innermost layer consisting of at least one polymer from the group polyamide, fluoropolymer, polyphenylene sulfide, polybutylene naphthalate, a first support layer consisting of polyamide, a barrier layer, a second support layer consisting of polyamide, an outer layer consisting of at least one polymer from the group polyamide, polyphenylene sulfide, polyphthalamide.

A duct assembly comprises a duct having an outer wall of polymer material, an insulating jacket coupled to the pipe, and a tracer wire within the insulating jacket. The insulating jacket is generally round in cross-section and is attached directly to the outer wall of the duct without the use of adhesive. The insulating jacket and tracer wire can be peeled as a unit from the outer surface of the duct. The insulating jacket is made of a thermoplastic polymer material and is attached to the outer wall of the duct by pressing together the outer wall of the duct and the insulating jacket while the polymer material of the insulating jacket is at or close to its melting point. The duct assembly can be made in a single continuous process. Methods of manufacture and use are disclosed.

A fluid assembly includes a base and at least one first device. The base includes a single-piece body including a base outlet, a base inlet, and a first interface including a first interface inlet and a first interface outlet. The base also includes a first flow path segment formed within the single-piece body that extends from the base inlet to the first interface outlet. The base also includes a second flow path segment formed within the single-piece body that extends from first interface inlet. The base also includes a ground path disposed within the single-piece body. The first device is attachable to the first interface to fluidly connect a first device inlet to the first interface outlet and a second device outlet to the second interface inlet.