Coaxial tubing systems incorporate bending sleeves of insoluble, compression resistant material with cold flow characteristics. Bending sleeves of length coextensive with a bend are dimensioned to substantially fill the annular space between inner and outer coaxial tubes, while also providing longitudinal fluid passageways between the tubes. Such bending sleeves are effective to enable bending of coaxial tubing systems by (a) transmitting bending forces to, from and between inner and outer tubes during bending, (b) restricting tube collapse, wrinkling and deformation during bending, and (c) maintaining spacing between inner and outer tubes after bending and limiting inner tube vibration, while (d) providing fluid passageways between the tubes for leak containment, leak detection, heating, heat dissipation and other auxiliary fluid flow purposes. Conductive spacers are provided for maintaining annular tube spacing, particularly at tube ends, and for enabling electrical grounding of the inner tube.
An acoustically isolated structure for use on a high temperature pipe in a luid environment is disclosed. Thermal insulation is provided radially outward from and adjacent to the pipe, and a sleeve is located on the outer surface of the insulation preventing environmental fluid from damaging the thermal insulation. A spacer is joined to the sleeve to position an acoustical barrier away from the pipe. The spacer allows environmental fluid circulation between the sleeve and the acoustical barrier.
Recesses or openings (4) are arranged in a wall of an elongated tubular covering (3) made of resinous plastics that are resistant to temperature stresses and/or aggressive media; these openings are covered from the outside by a microporous layer (5) made of a fluoropolymer that is resistant to high temperatures.
An improved pipe construction is disclosed having an inner and outer surface, intermediate walls extending between the inner and outer surfaces, and a plurality of primary and secondary internal cells. There are twice as many secondary internal cells as there are primary internal cells. Each of the primary internal cells is of a circular cross-section, while each of the secondary internal cells is of a three-sided cross-section. The primary and secondary cells are wound about the central longitudinal axis of the pipe. A method of forming the pipe of this structure is also disclosed.
A lined tubular system and method provides for the manipulation and control of annular fluids tubular and the liner. This structure allows for profiling of the exterior wall of a liner such that one or more continuous channels are provided along the length of the lined tubular system. The system may also include one or more non-crushable members or tubes between the liner's exterior surface and host tubular's interior surface. Rounded, granular particles in the annulus between liner and host may provide an alternative path for fluid flow. The particles may be uniformly or randomly distributed in the annulus.
A flexible secondarily-contained pipe of unitary or one-piece construction characterized in that it comprises the following combination of features: an inner supply pipe (1); an inner barrier layer (6) which forms an internal surface of the supply pipe (1) and which is formed from a first polymeric plastics material, an outer containment pipe (2); a plurality of passages associated with the secondary containment pipe, said passages being adapted to receive any fluid which has leaked from the inner supply pipe and to convey said fluid to a remote leak detector.
