API Std 650 flat-bottom tanks shell-plate

When the API Std 650 flat-bottom tanks top shell course is the minimum thickness indicated in 5.10.4, Table 5-6 and Figure 5-6, details a – e, h and i, the minimum anchorage shall be designed for normal loads as specified by the Purchaser and by this standard. See 5.11.2.3 for the allowable stress. When the top shell course is thickened beyond the minimum thickness provided in Table 5-6 or as in Figure 5-6, details f and g, or a knuckle is used, the minimum anchorage shall be designed for three times the internal design pressure. The allowable stress for this loading is 90% of the minimum specified yield strength of anchorage material.

According to API 650 tanks, anchoring devices should be designed to transfer overturning moments to the API Std 650 flat-bottom tanks tank foundation. At the same time, according to API 650 tank Appendix F, when the tank is to be anchored, the size of the anchoring parts is determined by the maximum lifting force caused by the internal pressure and wind load or the combination of internal pressure and seismic load.

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

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