There are three kinds of cryogenic cylinders commonly used at home and abroad: atmospheric storage, pressure storage with mother cylinder and vacuum tank with pressure storage. Which storage method is used depends mainly on the storage of cryogenic gas cylinders. Here is a detailed introduction to you:

1. Vacuum tank

The vacuum tank is a double-layer metal tank, the inner tank is a stainless steel pressure vessel with low temperature resistance, the outer tank adopts carbon steel material, and the interlayer is filled with heat insulation material and vacuum. The vacuum tank is transported to the site as a whole after the pressure test has been completed.

2, mother tank

The inner tank composite pot is composed of a plurality of temperature resistant stainless steel pressure vessel, the outer tank is a large steel container cover outside multiple tank, inside and outside the tank is between the thermal insulation material is filled into the interlayer, dry nitrogen to prevent wet air into. The inner tank of the mother tank can be transported to the site after factory manufacture and pressure test, and the outer tank can be installed on the spot.

3. Atmospheric tank

The structure of the atmospheric tank is double metal tank, and the outer tank adopts prestressed concrete structure; the upper tank and the underground tank, and the 20000m3 is mostly double metal tank.

There are a lot of special material can only be stored in low temperature environment, if the temperature is too high it is very easy to cause changes in metamorphic and performance of this kind of material, in order to facilitate the transportation, the transportation time will be placed in a cylinder in low temperature.

Cryogenic cylinders generally use 9%Ni steel, because the steel can maintain its high strength and excellent toughness at very low temperatures. 9%Ni steel welding technology is the key to the construction of low temperature gas cylinder.

Welding is a kind of special local heating and cooling process in the weld formation and the surrounding base material will inevitably be subjected to a special heat treatment, thus it is easy to form the organization and performance of a non-uniform welding heat affected zone.