Method for re-insulating installed steam pipe in situ

Details Method for re-insulating installed steam pipe in situ Method for re-insulating installed steam pipe in situ

1998-03-30

2000-02-22

Brinson, Patrick

Pipes and tubular conduits

Repairing

138149, 264 36, 264 465, 156 94, F16L 5518

Patent

active

060268611

ABSTRACT:
A method and apparatus for re-insulating underground steam pipe in situ includes the steps of creating at least one hole in the ground, inserting a liner into the hole, using a drill string to drill a hole in the conduit, inserting a tubing into the liner so that a first end of the tubing is positioned next to the pipe and a second end of the tubing is attached to a pumping system. The foam is then pumped through the tubing around the pipe and then the tubing is removed and the foam is allowed to cure and become rigid, thereby functioning as insulation.
The plastic foam may be a polyisocyanurate or a urethane-modified polyisocyanurate.

REFERENCES:
patent: 3616516 (1971-11-01), Corriston
patent: 4049480 (1977-09-01), Kutschke
patent: 4219050 (1980-08-01), Hargrave et al.
patent: 4698877 (1987-10-01), Patell et al.
patent: 5017314 (1991-05-01), Zemanek et al.
patent: 5027862 (1991-07-01), Laybourn
patent: 5125147 (1992-06-01), Hickham
patent: 5194193 (1993-03-01), Humphreys et al.
patent: 5241993 (1993-09-01), Stephens
patent: 5427154 (1995-06-01), Stephens
patent: 5560395 (1996-10-01), Bissonnette et al.

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