Title:
METHOD AND APPARATUS FOR LINING AN OUTER PIPE WITH AN INNER PIPE
Document Type and Number:
WIPO Patent Application WO2002064351
Kind Code:
A3
Abstract:
A method of lining an outer pipe (12) with an inner flexibly resilient pipe (14) includes the steps of introducing fluid into a pressure chamber (60) to reduce the diameter of the inner pipe (14) as the inner pipe is pulled into the outer pipe (12); increasing the length of the pressure chamber (60) as the inner pipe (14) is pulled into the outer pipe (12) to maintain the diameter of the inner pipe (14) pulled into the outer pipe (12) in its reduced form; and reducing the pressure of the fluid in the pressure chamber (60) once the inner pipe (14) has been pulled into the outer pipe (12) to discharge the fluid from the pressure chamber (60) as the inner pipe (14) expands within the outer pipe (12) to line the outer pipe (12).
Inventors:
BACON STUART MICHAEL (ZA)
Application Number:
PCT/IB2002/000445
Publication Date:
December 05, 2002
Filing Date:
February 14, 2002
Export Citation:
Assignee:
BARLOWORLD ROBOR PROPRIETARY L (ZA)
BACON STUART MICHAEL (ZA)
BACON STUART MICHAEL (ZA)
International Classes:
B29C63/34; F16L55/165; (IPC1-7): B29C63/34
Domestic Patent References:
| WO1998050725A1 | 1998-11-12 |
Foreign References:
| EP0233006A2 | 1987-08-19 | |||
| DE19502781A1 | 1995-08-10 | |||
| FR2665234A1 | 1992-01-31 | |||
| US4120614A | 1978-10-17 |
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