This standard stipulates the type and nominal volume of steel spherical storage tanks, the inner diameter of the spherical shell, the diameter of the center circle of the foundation of the spherical tank, the distance from the bottom surface of the pillar bottom plate to the equatorial plane of the spherical shell, the number of pillars, the number of zones of the spherical shell, and the number of zones of each zone. Basic parameters such as the center angle of the sphere and the number of blocks in each belt. This standard applies to spherical tanks supported by equatorial tangent columns for storage of gas and liquid materials in industries such as petroleum, chemical industry, metallurgy, and town gas.