What should be done if the pressure in a cryogenic storage tank becomes too high?
30 Oct,2019
Vertical or horizontal double-walled vacuum-insulated storage tanks used for storing liquid oxygen, nitrogen, argon, carbon dioxide, and other media are referred to as cryogenic storage tanks. Liquid natural gas must be stored in cryogenic storage tanks. Low-temperature storage tank It typically consists of an inner tank and an outer tank, with insulating material filled in the space between them.
During the design of cryogenic tanks, the conductive properties of the cryogenic medium inside the tank can easily induce frost heave in the foundation soil, causing the soil to swell and leading to foundation damage. To mitigate this adverse effect, in addition to providing thermal insulation between the tank bottom slab and the foundation base slab, anti-freeze measures must also be implemented for the tank foundation. Typically, two approaches are employed: first, installing an electric or other heating system within the foundation base slab to create a raft-type foundation with a circulating heating system; second, elevating the foundation base slab to create an air gap that effectively separates the slab from the underlying soil.
One of the most common problems with cryogenic storage tanks is excessive pressure. Factors such as the tank’s inherent vacuum level and the method of heat distribution, as well as improper filling practices during operation, can all lead to overpressure in cryogenic storage tanks.
The planning and manufacturing of cryogenic liquid storage tanks can be discussed from three aspects:
The design adopts an inner-and-outer-wall structure to minimize conductive heat transfer. The space between the walls is evacuated to suppress convective heat transfer, and thermal insulation material is filled in the interlayer to reduce radiative heat loss.
Any equipment subjected to prolonged use will inevitably experience some degree of stress; the same holds true for excessive pressure during the operation of cryogenic storage tanks. Before filling a cryogenic tank with its contents, it is essential to inspect the outer shell for dents and ensure that the vacuum vent remains intact. If these components are damaged, the vacuum level will decline, and in severe cases, air ingress will compromise the tank’s thermal insulation. This can lead to frost formation on the upper part of the tank, substantial liquid losses, and ultimately render the tank unfit for further use. In addition, the interior of the tank should be examined for any foreign objects, which must be removed to prevent corrosion of the inner liner.
The foregoing constitutes an analysis of the causes of excessive pressure in cryogenic storage tanks, along with corresponding solutions. In fact, we would also like to advise all users to conduct regular inspections when operating cryogenic storage tanks, in order to prevent unnecessary accidents.
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