Optional design procedures of API standard 650 welded aluminum storage tanks

API 650 petroleum storage tank stipulates that if the thickness of the lower siding obtained by calculating the anti-overturning moment is greater than the thickness of the API standard 650 welded aluminum storage tanks hydrostatic pressure test (both do not include the corrosion margin), the calculated thickness of the above siding required by the hydrostatic pressure is It should also be increased by the same proportion, unless special analysis is performed to determine the seismic overturning moment and corresponding stress at the bottom of each layer of API 650 petroleum storage tank wall.

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

The thickness of the API standard 650 welded aluminum storage tanks wall plate, t, required by 5.10.3 for the latitudinal unit forces, T2, acting at this level is 0.57 in. The nozzle neck is seamless steel pipe and conforms to ASTM A53, Grade A; the materials in the tank wall and reinforcing pad conform to ASTM A442 Grade 55. The main joints in the tank walls are fully radiographed, double-welded butt joints. The adequacy of the reinforcement and attachment welds shown in Figure F-7 shall be determined.
To determine the length of the nozzle neck within the limits of reinforcement, the smaller of the following calculated values shall be used:(2.5)(0.625) = 1.56 in.
(2.5)(0.375) + 0.75 = 1.69 in.

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