The material of stainless steel tank can be divided into tank material and accessory facility material. Tank material can be divided into low strength steel and high strength steel according to tensile yield strength (6s) or tensile standard strength (6b). High strength steel is mostly used for storage tanks above 5000 m3. There are 20, 20R, 16Mn, 16MnR and Q235 series commonly used in the manufacture of storage tanks.
The volume of the stainless steel storage tank is generally less than 100m3, which is usually used in production or gas station. The circumferential weld of the horizontal storage tank is lapped, the longitudinal weld is butted, the circular plate is arranged alternately, and the odd number is taken to make the end cover diameter the same. The end caps of horizontal tanks are divided into flat end caps and butterfly end caps. Horizontal tanks with flat end caps can withstand 40 Kpa internal pressure and horizontal tanks with butterfly end caps can withstand 0.2 Mpa internal pressure. Underground horizontal storage tanks must be equipped with reinforcing rings, which are also made of angle steels.
In order to ensure the safe operation of stainless steel tanks, it is necessary to heat the stainless steel tanks. However, because the temperature distribution of crude oil in the tank is not clear during the process of temperature drop, it is blindness to operate the temperature rise only by experience.