Thermal insulation

Details Thermal insulation Thermal insulation

F - Mech Eng,Light,Heat,Weapons

16

L

189/20

F16L 59/00 (2006.01) F16L 59/04 (2006.01) F16L 59/06 (2006.01)

Patent

CA 2022834

MW/JLB/89B122 ABSTRACT Thermal Insulation A pipeline 2 has an inner surface 4 which comes into contact with cryogenic fluid at a temperature of 70K. The outer surface 6 of the pipeline 2 carries a coating of foamed polyurethane having closed cells containing carbon dioxide. The pipeline 2 is located in an outer sleeve 10. The annular space 12 defined between the pipe 2 and the sleeve 10 is filled with perlite powder and is able to be purged with dry nitrogen gas. In operation with the inner surface 4 of the pipelines subjected to a temperature of 70K, 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 77K so that the nitrogen purgant does not condense. A relatively simple alternative to conventional vacuum insulation is thereby provided.

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