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Storage tank with liquid insulator for storing cryogenic fluids using water displacement
| Details |
Inventors: McCabe, John S.; Stafford, Donald C.; Laverman, Royce J.;
Assignee: Chicago Bridge & Iron Company (Oak Brook, IL)
Primary Examiner: Corbin; David H.
Assistant Examiner:
Attorney, Agent or Firm: Merriam, Marshall & Bicknell
A liquefied gas storage tank having insulated vertical walls and an insulated top, said tank being located in and surrounded by a body of water with the exterior water level below the top of the tank walls, the tank interior space containing a layer of water in communication with the body of water so that water can be supplied to and be removed from the tank, an insulating layer floating on the water layer in the tank, and a liquefied gas floating on the insulating layer. The insulating layer can include a float which extends over the water layer except for a rim space between the periphery of the float and the tank walls, and an insulating liquid in the rim space which has a specific gravity less than water and higher than the liquefied gas, and with the insulating liquid being essentially immiscible with water and remaining liquid at the liquefied gas storage temperature. |
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DETAILED DESCRIPTION According to the present invention there is provided a novel improved system for storing a cryogenic liquid, or liquefied gas, in an insulated tank using the water displacement principle.
The invention broadly comprises the combination of a liquefied gas storage tank having insulated vertical walls and an insulated top, said tank being located in and surrounded by a body of water which the exterior water level below the top of the tank walls, the tank interior space containing a layer of water in communication with the body of water so that water can be supplied to and be removed from the tank, an insulating layer floating on the water layer in the tank, and a liquefied gas floating on the insulating layer.
The insulating layer may be solely an insulating liquid which has a specific gravity less than water and higher than the liquefied gas, said insulating liquid being essentially immiscible with water and the liquefied gas.
The insulating liquid, of course, must not solidify at the temperature of the liquefied gas or cryogenic liquid in the tank.
Because there is likely to be turbulence in the tank during filling and emptying which could cause an insulating liquid layer by itself to intermix with the water or the liquefied gas, thereby eliminating the required insulating action, it is desirable to include, as part of the insulating layer, a float which extends over the water layer except for a rim space between the periphery of the float and the tank walls, and an insulating liquid in the rim space which has a specific gravity less than water and higher than the liquefied gas, said insulating liquid being essentially immiscible with water, and remaining liquid at the liquefied gas storage temperature.
The insulating liquid should preferably be immiscible with the liquefied gas.
Alternatively, the insulating liquid could be miscible with the liquefied gas, but have an acceptably low rate of solution at the interface between the two liquid layers.
The float can be a closed shell filled with insulating liquid, a shell open at the top or bottom, or it can be an open network filled with insulating liquid
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Metal Working 
