Storage tank is applied for storing of acid, alcohol, and gases which are refined chemicals. There are many types of tanks, in general, they are: rotational mould storage tank, ceramic storage tank, rubber storage tank, welded plastic storage tank and so on. From the view of cost performance ratio, rotational mould storage tank is the best and it can be sub-classified as steel-lined tank and complete plastic one, with vertical, horizontal, for-transfer, and for-mixing and various types.