Soil-structure interaction effects for API standard 650 floating-roof tanks

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Tank cracks are common API standard 650 floating-roof 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 floating-roof tanks construction, which become obvious after the later use. Or in the process of using the API standard 650 floating-roof tanks, the tank body material generated new defects due to corrosion, pressure, wear and other reasons, and tank cracks.

Bearing on Foundations
Foundations shall preferably be designed to resist the load exerted by the API Standard 620 tank and its contents when the tank is filled with water to the design liquid level. Foundations shall be designed at least for the maximum operating conditions including the wind load. During the API standard 650 floating-roof tanks water test, the total load on the foundation shall not exceed 125% of the allowable loading. If necessary, the water level during the test may be reduced below the design liquid level line so as not to exceed the 25% maximum overload (see Q.8.1.2).