API standard 650 cylindrical tanks repair
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Tank cracks are common API standard 650 cylindrical tanks defects, mainly including tank wall cracks, internal cracks, weld zone cracks. The reason for these defects may be that the defects not exceeding the standard existed in the early stage of API standard 650 cylindrical tanks construction, which become obvious after the later use. Or in the process of using the API standard 650 cylindrical tanks, the tank body material generated new defects due to corrosion, pressure, wear and other reasons, and tank cracks.
Allowable Design StressesThe maximum allowable design stresses for the API standard 650 cylindrical tanks 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.
