API 650 closed top welded storage tanks double-flanged, low-type nozzles

Selection of nominal diameter D of API 650 storage tank. In the design calculation of API 650 storage tank, the bottom plate thickness is the net plate thickness, that is, the actual thickness minus the corrosion allowance. In the design and calculation of API 650 closed top welded storage tanks wall thickness in hydrostatic test, the thickness of bottom plate is the total thickness of steel plate.

Generally, the building area temperature of the API 650 closed top welded storage tanks should be considered before the tank design and construction. The temperature in the API 650 closed top welded storage tanks building area is closely related to the evaporation loss, energy loss, storage tank materials and the selection of detection instruments, or has a direct impact on the storage cost of the storage liquid. For the same medium, the higher the air temperature and the longer the duration, the higher the material temperature in the API 650 closed top welded storage tanks, the higher the corresponding pressure and the more volatile loss.

The increased uplift described in API Standard 620 tank Appendix Q is intended to apply to the size of the ringwall and foundation but not the anchorage. For tanks with an internal design pressure of 1 lbf/in.2 gauge and over, the uplift, if any, shall be calculated under the combined conditions of 1.25 times the internal design condition plus the design wind load on the API 650 closed top welded storage tanks shell and roof.

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