Insulated pipe

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B - Operations, Transporting

05

D

117/126, 117/55

B05D 1/02 (2006.01) B05D 7/24 (2006.01) B29C 44/22 (2006.01) B29C 44/32 (2006.01) F16L 59/00 (2006.01) F16L 59/02 (2006.01) F16L 59/08 (2006.01) F16L 59/14 (2006.01) F16L 59/147 (2006.01) B29C 47/00 (2006.01)

Patent

CA 1160914

ABSTRACT OF THE DISCLOSURE Metal pipe insulated with foamed polyurethane plastic is made in a multi-stage continuous process in which one or more inner layers of polyure- thane plastic are foamed on the pipe and at least partially cured to form low-density foam having high heat insulating capacity, and an outer layer of polyurethane plastic is foamed on the inner layer to provide a foam layer of higher density, the outer layer having a density at least 25% greater than that of the adjacent inner layer, the thickness of the outer layer being 5 to 30% of the total thickness of the foamed insulation.

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