Flat bottom tanks are designed for storage of large amounts of cryogenic liquids (02, N2, Ar, and CH4) at atmospheric pressure. The ca¬pacity of the standard cryogenic tank ranges from 200 to 5,000 m3.
A stationary flat bottom non-pressurized tank consists of two vessels, one placed inside another. The inner vessel is made of stainless steel, and the outer vessel is made of carbon steel. The space between the steel walls is filled with an insulation material: foamed glass on the bottom, expanded perlite on the walls and the roof. The space is also filled with dry nitrogen in order to ensure efficient and durable insulation.
Each tank can be equipped with atmospheric, steam or electric evaporators of cryogenic liquids, and with cryogenic pumps to deliver the required volume and pressure of products.
The vacuum-insulated double wall tanks consist of two concentric vessels, an auste-nitic steel inner tank and an outer jacket in carbon steel with an anti-corrosion primer and a special environmentally friendly top coat. The interspace between inner and outer tank is evacuated and filled with insulating powder (perlite). An adsorbent is also added to maintain the vacuum in the insulation interspace.
Vertical or horizontal design
Horizontal elliptical bottom cryogenic tanks operate at a pressure of 3 and 5 bar. The standard tank capacity ranges from 100 to 300 m3. Vertical elliptical bottom cryogenic tanks oper¬ate at gage pressure till 17 bar. The standard tank capacity ranges from 5 to 200 m3.
Specification of vertical cryogenic tanks