API Std 650 mixed material tanks metal-seated ball valve

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

The design metal temperature of API Std 650 mixed material tanks each component exposed to the liquid or vapor being stored shall be the lower of the following:
a)The minimum temperature to which the tank contents will be refrigerated, including the effect of subcooling at reduced pressure.
b)The minimum metal temperature anticipated when the atmospheric temperature is below the refrigerated temperature (see 4.2.1). The effectiveness of the insulation in keeping the metal temperature above the expected minimum atmospheric temperature shall be considered.

In Appendix E to API 650 oil storage tank, the maximum values of inertia force, pulse pressure and convection pressure are superimposed, and tend to be conservative.In GB50341, only pulse pressure is calculated for API Std 650 mixed material tanks tanks below 5000 m.

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