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US 6,644,356 B1Granted
Rehabilitation of water supply pipes
AssigneeSuez Lyonnaise des Eaux
InventorsRaymond Connor, Simon Daniels
Life of this patent
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Abstract
Device for use in rehabilitation of water supply pipes includes a tubular liner (10) which is deployed through a pipe (11) for example by a line attached to a messenger pig which is propelled through the pipe. The liner (10) has a multi-lobed pleated cross-section, and is of a polyolefin elastomer material, e,g, a substantially linear ethylene inter-polymer. The liner is extruded and die drawn during extrusion to produce a reduced diameter highly oriented structure.
Claims8
A method of rehabilitating water supply pipes by inserting a tubular liner within a pipe, the method comprising the steps:
- positioning a collapsed pleated tube shaped liner at one end of the pipe;
- securing one end of the liner at the end of the pipe;
- subjecting the liner to movement into the pipe;
- subjecting the liner to expansion once inserted in the pipe, the liner expanding to a star shaped multi-lobed cross section, the shape provided by longitudinally extending radial pleats and ribs;
- said liner made from a substantially linear ethylene inter-polymer elastomer/plastomer.
2 more elements
Dependencies are inferred from the claim text.