Heat insulating structures for low-temperature or cryogenic...

Details Heat insulating structures for low-temperature or cryogenic... Heat insulating structures for low-temperature or cryogenic...

F - Mech Eng,Light,Heat,Weapons

17

C

154/144

F17C 7/02 (2006.01) F16L 9/14 (2006.01)

Patent

CA 1244336

ABSTRACT OF THE DISCLOSURE A heat insulating structure for low-temperature or cryogenic pipings, comprising at least one heat insulating barrier and at least one moisture barrier which are laid on the outer suface of a piping to be heat-insulated, and at least one sheathing layer, wherein said heat insulating barrier comprises an extruded styrenic resin foam and wherein, as expressed in terms of the three-dimensional coordinates X (circumferential direction), Y (thicknesswise direction) and Z (longitudinal direction), said heat insulating barrier has a Y-axial water vapor permeability Py of 1.5 g/m2?hr or less and at least the heat insulating barrier most adjacent to said piping has X-axial and Z-axial elongations at rupture Ex and Ez in the range of 8 to 40 percent.

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