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Seismic design of API620 conical-bottom tank

Seismic design of API620 conical-bottom tank

Seismic design of API620 conical-bottom tank

Allowable Design Stresses
The maximum allowable design stresses for the API620 conical-bottom tank materials outlined in Q.2.1 shall be in accordance with Table Q-3.The values for the allowable design tensile stress given in Table Q-3 for materials other than bolting steel are the lesser of (a) 331/3% of the specified minimum ultimate tensile strength for the material or (b) 662/3% of the specified minimum yield strength, but they are 75% of the specified minimum yield strength for the stainless steel, nickel alloy, and aluminum materials. Allowable test stresses are based on the limitation of API 620 oil tank storage standard Q.8.1.3.

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Lateral braces between outer bay rafters must be provided if asymmetrical structural shapes are used for rafters and if the API620 conical-bottom tank API 650 tanks are located in areas subject to earthquakes. The bracing must be adequately sized for the seismic zone specified.

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