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Cryogenic oxygen, nitrogen and argon storage tanks
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There is no standardised definition of the design of cryogenic storage tanks themselves. Relatively speaking, the British technical standards in this regard are more systematic and comprehensive. Its standard "flat-bottomed vertical cylindrical cryogenic storage tank applications" according to different process requirements and media storage, cryogenic tanks are defined as single-vessel tanks, double-vessel tanks and full-vessel tanks and other three tank forms. Single-vessel tanks generally have a steel inner tank plus insulation shell composition, while the double-vessel tanks and full-vessel tanks are made of a steel inner tank and a steel or concrete (generally pre-stressed concrete) made of outer tanks, thermal insulation is located in the inner and outer tank wall between the more commonly used is the double-capacity tank form. In the cryogenic tank design, due to the tank of low-temperature medium conduction, making the foundation soil is very easy to produce freeze-up and make the soil bulge, which in turn cause damage to the foundation, so in order to eliminate this unfavourable factor, in addition to set up between the tank bottom plate and the surface of the foundation plate thermal insulation measures, but also must be taken on the base of the tank anti-freeze measures, the usual practice of two kinds of, first, in the base of the base plate with electric or other heating system, that is One is to use electric or other heating system in the base plate, i.e., to make a raft plate foundation with circulating heating system, and the other is to use the base plate to be elevated, and the air layer formed by the elevation will separate the base plate from the foundation soil. The former is not often used because of the high cost of the heating system. In most of the cryogenic tanks introduced into the country, the overhead raft foundation form is commonly used. The net height of the overhead layer, generally in addition to process piping and equipment layout requirements to determine, but also according to the tank temperature of the storage medium for a certain temperature conduction calculations to determine. Overhead raft foundation can be divided into a single raft (sill) and double raft (sill) two forms of overhead, in the case of better geological conditions, generally can be used in the form of a double raft foundation; but due to the low temperature storage tanks on the basis of settlement requirements are relatively high, in most cases, especially when the geological conditions of the poorer soft ground, it is more than the use of a single raft (sill) piling, and sometimes there are also used double raft (sill) Pile foundation.
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