Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Repair – replacement – or improvement
Reexamination Certificate
2007-02-06
2007-02-06
Singh, Sunil (Department: 3673)
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
Repair, replacement, or improvement
C405S184100, C138S097000
Reexamination Certificate
active
11390238
ABSTRACT:
A deformed thermoplastic liner is drawn through a cut host pipe and split sleeve halves attached to it and then reformed to its cylindrical configuration using pressurized steam. The split sleeve halves are removed, and an adapter flange is fused onto a cut end of the liner portion. The split sleeves halves are then re-attached with the adapter flange between bolted flanges of the split sleeve halves and a section welded to the adjacent host pipe to provide a permanent pressure sealed connection. The lined host pipe can also be connected to a lateral pipe using a lateral extension fused to the rerounded liner and a third split sleeve half with a lateral pipe extension that receives the lateral extension and is attached to the lateral pipe, either directly, or through a second split sleeve.
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Crabtree John Douglas
Tate James Lewis
Nixon & Vanderhye P.C.
Pipe Liners, Inc.
Singh Sunil
Weatherford U.S.L.P.
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