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Classification and use precautions of stainless steel storage tank

Release time:

2020-03-02

There are many different types of stainless steel storage tanks, and the thickness of stainless steel storage tanks with high strength metal materials is thinner than that of non-metallic raw materials with poor strength. The most mature technical means of manufacturing and installation are vault stainless steel storage tanks, floating roof stainless steel storage tanks and umbrella roof stainless steel storage tanks. Here we take a look at the application of these three cans and how to antiseptic.

Floating roof stainless steel storage tank: The floating roof of this tank (referred to as floating roof) floats on the liquid storage surface. There is an annular space between the floating roof and the tank wall. There is a sealing element in the annular space. The floating roof and the sealing element together form the covering layer on the liquid storage surface, which floats up and down with the liquid storage, so that the liquid storage in the tank is completely separated from the atmosphere. Reduce evaporation loss during storage and ensure safety. Reduce atmospheric pollution. The form of floating roof has double disc, single disc, float type and so on. The scope of use of floating roof tanks in general. Crude oil, gasoline, solvent oil and liquid chemicals that need to control evaporation loss and air pollution, control the emission of undesirable gases, and have fire hazards can be used in floating roof tanks. Floating roof tanks can be sealed twice as required.

The floating roof rises and falls with the growth or reduction of the storage of the medium in the tank. There is an annular sealing device between the outer edge of the floating roof and the tank wall. The medium in the tank has been directly covered by the inner floating roof to reduce the volatilization of the medium. Stainless steel tank temperature composition: high temperature usually choose metal materials and metal lining, the greater the temperature of the stainless steel tank task, the material should be resistant to temperature, the thickness of the stainless steel tank is thicker than the normal temperature. Non-metallic raw materials plastic withstand temperature is small. The selection principle of stainless steel tank sealing gasket is that for occasions where the application is not high, it can be selected by education and changed when it is not suitable. However, for those places with strict requirements, such as explosive, highly toxic and combustible gases, and strong erosion of stainless steel storage tank liquid facilities, reaction tanks and transportation pipeline systems, etc., they should be selected according to the task pressure, task temperature, corrosion of the sealing medium and the form of drawing the sealing surface.

Umbrella-roofed stainless steel storage tanks: are variants of self-supporting vaults, any horizontal section of which has a regular polygon. The roof load is supported on the tank wall by the umbrella plate. The strength of the umbrella top is close to that of the arch top, but it is easier to install because the umbrella plate is only bent in one direction. Umbrella tank roof is listed as a structural form of tank roof in American API 650 and Japanese JISB8501 tank specifications. However, it is rarely used in the country. Reticulated shell top storage tank (spherical reticulated shell) steel reticulated shell structure in the modern large gymnasium roof structure has mature design experience engineering practice proved that it has sufficient rigidity and reliability, showing that the reticulated shell structure tank top has a wide range of promotion and use value.

Vault stainless steel storage tank: vault stainless steel storage tank, in simple terms, it is a kind of steel container with spherical crown and cylindrical tank body. Its advantage is that it is simple to manufacture and low in cost, so it can be used in many industries and has a wide range of applications. The volume of this kind of storage tank is in the range of 1000-10000 cubic meters, but at present some domestic manufacturers can achieve 30000 cubic meters.

For stainless steel storage tanks, common external environmental corrosion includes: corrosion of the storage tank bottom plate placed on the foundation; Stress corrosion of stainless steel storage tanks caused by chloride inclusions in the air; Condensed water vapor, especially condensed water vapor under the insulation layer Corrosion; Crevice corrosion of welding, reinforcing plates and bolts. The corrosion of the external environment of the storage tank shortens the maintenance and repair cycle of the storage tank, and even makes the storage tank scrapped in advance, which affects the normal operation of storage and transportation.