90ft diameter API 650 stainless steel storage tanks

The inner layer of API 650 tank is the same as that of single layer tank. It is made of high-quality steel plate in strict accordance with the standard of "steel welded atmospheric pressure vessel". The thickness of API 650 stainless steel storage tanks steel plate reaches the standard and the service life is longer.

In this project, an elemental area of tank wall used is constructed of ASTM A442 Grade 55 steel plate subjected to a meridional unit force, T1, of 4000 lbf/in.2 tension and a latitudinal unit force, T2, of 5060 lbf/in.2 compression. The meridional radius of curvature, R1, is 75 in., and the length of the normal from the surface to the axis of revolution, R2, is 300 in. The joints in the wall are of double-welded butt-joint construction with a tensile efficiency of 85%. A corrosion allowance of 1/16 in. is required.
The problem in this example is to graphically find the minimum thickness of tank wall required for the given conditions (see 5.10.3.3).
Solution: As determined from Table 5-1, the maximum allowable tensile stress value, Sts, for ASTM A442 Grade 55 steel plate in simple tension is 16,500 lbf/in.2. Since the compressive stress is latitudinal, the governing value of R in this situation is R1, or 75 in.

The water dissolved in the oil will be separated out from the oil stored in the API 650 stainless steel storage tanks for a long time, and the acidic water layer will appear at the bottom of the API 650 stainless steel storage tanks for a long time, which will accelerate the corrosion of the API 650 stainless steel storage tanks and cause the wall thinning and even leakage. With the increase of service life, the API 650 stainless steel storage tanks must be inspected and cleaned regularly to check the hidden danger.

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