API 650 duplex stainless steel tanks examiner

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

The thickness of the API 650 duplex stainless steel 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.

The working pressure of the low-pressure storage tank is greater than that of the atmospheric storage tank, but its pressure is less than 0.1MPa. API 650 petroleum storage tanks are classified according to their environment: Above-ground storage tank: refers to the bottom of the storage tank at the design elevation of API 650 duplex stainless steel tanks and above; the bottom of the tank is below the design elevation of +0.00 but not exceeding.

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