Insulated tanks for liquefied gases
Patent
·
OSTI ID:6013949
In spite of elaborate thermal-insulation systems, spherical skirt-supported tanks onboard LNG carriers still allow heat to leak into the tank via conduction through the skirt; however, introducing an insulator into the skirt itself would violate the tank/skirt's structural unity, which is its prime safety factor. This tank design incorporates a thermal barrier or temperature brake between the top and bottom portions of the skirt, decreasing the heat flow by 40-50% - equivalent to a 15-25% reduction of the total heat leak, depending on the tank's insulation. Stainless steel is one material suitable for this intermediate heat-brake skirt portion because (1) its heat-conductivity properties are poor relative to the surrounding materials (usually aluminum), (2) its thermal-expansion coefficient lies between the coefficients of the top and bottom skirt portions, and (3) if thermally insulated, it can withstand very low temperatures.
- Assignee:
- Moss-Rosenberg Verft A/S, Norway
- Patent Number(s):
- US 4220255
- OSTI ID:
- 6013949
- Country of Publication:
- United States
- Language:
- English
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