API 650 ground supported tanks butt-welded bottom joints

Volatilization is the characteristic of oil. Under normal temperature and pressure, as long as the oil is in contact with air, the surface will volatilize. Through scientific analysis and summary, the causes of oil volatilization loss in API 650 ground supported tanks are: natural ventilation loss, static storage loss, dynamic liquid level loss. In the use of API 650 ground supported tanks, static storage loss and dynamic liquid level loss are common losses.

This standard establishes minimum requirements for API 650 tank material, API 650 ground supported tanks design, fabrication, erection, and inspection for ertical. aboveground，closed- and open-top.

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The thickness of the API 650 ground supported 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.