Pipe linings

Details Pipe linings Pipe linings

1983-05-16

1988-11-22

Bell, Janyce A.

Coating processes

Interior of hollow article coating

Spraying

427239, 427299, 427327, 427422, 427426, 4273881, B05D 722

Patent

active

047865253

ABSTRACT:
A spraying device is drawn through an underground pipe and sprays a thixotropic resin onto the inner walls of the pipe. The resin cures and hardens, to form an internal lining to the pipe. The resin has sufficient thixotropy to enable it to be applied in a single operation to a significant thickness, preferably in the range 2 to 25 mm. The lining which is formed upon curing therefore has significant structural strength. To allow such a resin to be pumped from the surface down to the spraying device, along a significant length of tubing, the resin is firstly heated, prior to being pumped.
Also disclosed is a swab for swabbing a pipe immediately prior to the application of a lining therein.

REFERENCES:
patent: 3603096 (1971-09-01), Wells
patent: 4064293 (1977-12-01), Nicklas
patent: 4178875 (1979-12-01), Moschetti
patent: 4251573 (1981-02-01), Holm et al.
patent: 4308824 (1982-01-01), Muta et al.
patent: 4327132 (1982-04-01), Shinno
patent: 4370364 (1983-01-01), Boer
patent: 4401696 (1983-08-01), Wood
patent: 4440350 (1984-04-01), Dietz et al.

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