Construction of pipes
AssigneeLong Pipes (Pty) Ltd.
InventorNeil Deryck Bray Graham
Life of this patent
Estimating the term…
Abstract
An elongate hollow structure and method of constructing the hollow structure is described, whereby the hollow structure includes a radially inner portion and a radially outer portion adapted to be merged together to form a tubular wall structure. The method includes providing the radially inner portion, providing the radially outer portion about the radially inner portion, wherein a space exists between the radially inner and outer portions, the space containing a gas therein, and expanding the inner portion. The gas within the space between the inner and outer portions is arranged to be expelled as the inner portion is expanded.
Claims24
A method of constructing an elongate hollow structure comprising a radially inner portion and a flexible radially outer portion, with the two portions adapted to be merged together to provide an integrated tubular wall structure, the method comprising:
- providing the inner portion,
- providing the flexible outer portion about the inner portion, the flexible outer portion having less resilience than the inner portion so as to yieldingly resist radial expansion of the inner portion, wherein a space containing a gas therein exists between the inner and outer portions, and
- expanding the inner portion, wherein the gas within the space is arranged to be expelled as the inner portion is expanded.
An elongate hollow structure of composite construction, comprising:
- a radially inner portion configured to be expandable, and
- a flexible radially outer portion, the two portions configured to be merged to provide an integrated tubular wall structure, the flexible outer portion having less resilience than the inner portion so as to yieldingly resist radial expansion of the inner portion, wherein
- a space exists between the inner and outer portions, and
- any gas present in the space is arranged to be expelled as the inner portion is expanded.
Dependencies are inferred from the claim text.