A large oil storage tank refers to a large container with a capacity of more than 100 cubic meters and consisting of tank walls, tank tops, tank bottoms and tank accessories for storing crude oil or other petroleum products. Large oil storage tanks are containers for storing oil products. They are the main equipment of oil depots and are mainly used in oil refineries, oil fields, oil depots and other industries.

Capacity calculation

The nominal capacity of the oil tank can be approximated by the following formula;

V≈πD2h/4

Where V——nominal capacity of oil tank, cubic meter;

D——basic diameter of oil tank, cubic meter;

H——The height of oil tank wall, cubic meter;

Nominal capacity It is the theoretical capacity of the oil tank. When designing the oil tank, the height and diameter of the oil tank are selected based on the nominal capacity. We usually call a 3000 cubic meter oil tank or 5000 cubic meter oil tank, and this capacity is the nominal capacity.

The storage capacity is the actual capacity of the oil tank. Generally, oil tanks have a safe capacity. The upper part of the oil tank has a certain space, and its height is A. A is generally determined by the structure of the oil tank and the accessories on the upper part of the tank wall (such as foam generators, tank wall vents, etc.) of.

Operating capacity When the oil tank is in use, some oil products in the lower part of the inlet and outlet pipes cannot be sent out. These oil products are usually called "dead volume" and their height is B. This capacity is usually required by oil depot measuremen, pump operators, etc., for reasonable dispatch and safe sending and receiving.

basic structure

The basic structure of a large oil storage tank is composed of tank wall, tank top, tank bottom and tank accessories. The longitudinal welding seam of the tank wall ring plate of the oil tank is generally a butt joint, a circumferential welding seam, a sleeve type is generally used for medium and small-capacity oil tanks, and a mixed type is generally used for large-capacity oil tanks. The tank wall steel plate must meet the strength requirements and also the stability requirements. Generally divided into vertical vaulted oil tanks, vertical cone-top oil tanks, and spherical oil tanks. The structure is divided into two types: butt joint and overlap joint.

The bottom plate of the vault oil tank generally has a two-sided three-knife structure. The middle part of the tank bottom plate is called the medium plate, and the edge part is called the edge plate. When the diameter of the oil tank is D<12.5m, the typesetting form consisting of a rectangular medium plate and the edge is generally adopted. When D≧12.5, the typesetting form consisting of a bow-shaped edge plate is adopted.

Common specifications

Common vault oil tank specifications in my country are: 100 cubic meters, 200 cubic meters, 300 cubic meters, 500 cubic meters, 700 cubic meters, 1000 cubic meters, 2000 cubic meters, 3000 cubic meters, 5000 cubic meters, 10000 cubic meters, 20,000 cubic meters, 30,000 cubic meters, 50,000 cubic meters, 100,000 cubic meters, and 120,000 cubic meters.