초록 ▼

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

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.

대표청구항 ▼

[ What is claimed is:] [1.]1. A flexible piping system for conveying a fluid, said piping system being constructed from a plastic material and comprising:(i) an inner pipe layer which defines a first passage for conveying said fluid;(ii) an inner barrier layer which forms an internal surface of the

[ What is claimed is:] [1.]1. A flexible piping system for conveying a fluid, said piping system being constructed from a plastic material and comprising:(i) an inner pipe layer which defines a first passage for conveying said fluid;(ii) an inner barrier layer which forms an internal surface of the inner pipe layer;(iii) an outer protective pipe layer; and(iv) an intermediate foam layer located between the inner pipe layer and the outer protective layer; rein the intermediate foam layer incorporates a plurality of longitudinal passageways extending substantially entirely along the axial length of the pipe.