Thermal insulation: CO.sub.2 filled foam

Details Thermal insulation: CO.sub.2 filled foam Thermal insulation: CO.sub.2 filled foam

1990-08-02

1992-11-03

Robinson, Ellis P.

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

428 358, 428 3691, 4283126, 4283148, 4283179, 4283191, 4284258, 220431, 220444, 220901, 138143, 138149, 138DIG9, F16L 5914, B65D 8800

Patent

active

051607697

ABSTRACT:
A pipeline has an inner surface which comes into contact with cryogenic fluid at a temperature of 70.degree. K. The outer surface of the pipeline carries a coating of foamed polyurethane having closed cells containing carbon dioxide. The pipeline is located in an outer sleeve. The annular space defined between the pipe and the sleeve is filled with perlite powder and is able to be purged with dry nitrogen gas.
In operation with the inner surface of the pipelines subjected to a temperature of 70.degree. K., the carbon dioxide in the cells of the polyurethane solidifies creating a vacuum therein. This increases the temperature difference across the polyurethane coating and enables the perlite powder to be maintained at a temperature above 77.degree. K. so that the nitrogen purgant does not condense. A relatively simple alternative to conventional vacuum insulation is thereby provided.

REFERENCES:
patent: 3425455 (1969-02-01), Kilpert
patent: 3812886 (1974-05-01), Hallwood
patent: 3886981 (1975-06-01), Eliason
patent: 3930375 (1976-01-01), Hofmann
patent: 4287245 (1981-09-01), Kikuchi
patent: 4590971 (1986-05-01), Webster
patent: 4640312 (1987-02-01), Patell
patent: 4706711 (1987-11-01), Czvikovsky
patent: 4744842 (1988-05-01), Webster

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