Multi-step combined mechanical/thermal process for removing coat

Details Multi-step combined mechanical/thermal process for removing coat Multi-step combined mechanical/thermal process for removing coat

1990-10-09

1992-02-25

Ball, Michael W.

Adhesive bonding and miscellaneous chemical manufacture

Differential fluid etching apparatus

With microwave gas energizing means

156584, 51319, 51322, 62 62, 62 64, 134 17, 225 935, 241DIG37, 264 28, B32B 3118, B32B 3122

Patent

active

050910345

ABSTRACT:
To remove a thick insulating coating from a steel pipeline, with high efficiency and speed, multiple cooling and scraping steps are performed sequentially. In a first cooling step, a low temperature coolant is sprayed onto the coating for a time sufficient to cool only a portion of the coating to a temperature below the embrittlement temperature thereof. After scraping away the embrittled outer layers of the coating, subsequent cooling and scraping steps are performed until all of the coating has been embrittled and removed. It has been found that the time required for removing the coating by use of such multiple spraying and scraping steps is substantially less than that where the coating is to be embrittled in a single step.

REFERENCES:
patent: 2609150 (1952-09-01), Bludeau
patent: 3948679 (1976-04-01), Lewis
patent: 4487643 (1984-12-01), Ellett
patent: 4589203 (1986-05-01), Le Diouron
patent: 4627197 (1986-12-01), Klee et al.
patent: 4692982 (1987-09-01), Rice
patent: 4705574 (1987-11-01), Burckhardt et al.
patent: 4956042 (1990-09-01), Hubert et al.

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