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US 5,510,078 AGranted
Method of lining pipelines and passageways
AssigneeInsituform (Netherlands) B.V.
InventorsEdward P. Smith, Graham F. Towers
Life of this patent
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Abstract
A lining process for a pipeline or passageway employs a resin impregnated lining tube which is everted into a collapsed preliner tube in the passageway to be lined. A constraining element allows the preliner tube to expand only in the vicinity of the everting face so that a pool of resin is formed between the everting face and the preliner tuber adjacent to the constraining element. In this manner, air is prevented from communicating with the everting face.
Claims8
A method of lining an existing passageway or conduit with a flexible resin impregnated liner, comprising:
- installing a preliner tube of a flexible material in the conduit to be lined;
- maintaining the preliner tube in a collapsed condition in the conduit;
- installing a constraining means disposed about the exterior of the preliner tube to maintain the preliner tube in the collapsed condition;
- everting a flexible lining tube including a layer of resin absorbent material impregnated with a curable synthetic resin and an outer impermeable film into the preliner tube;
- placing a quantity of resin in the preliner tube in the region between the everting face of the lining tube and constraining means;
- continuing to evert the lining tube into the preliner tube whereby the quantity of resin within the preliner tube at the face of the everting lining tube maintains the face of the everting lining tube fully wetted with resin and displaces the constraining means along the preliner tube as the lining tube is everted;
- and
- curing the everted lining tube in the conduit.
5 more elements
Dependencies are inferred from the claim text.