Elastic displacements of API standard 650 welded aluminum storage tanks

The calculated thickness of the above-mentioned wall panels required by the hydrostatic pressure is also It API standard 650 welded aluminum storage tanks should be increased by the same ratio, unless special analysis is performed to determine the seismic overturning moment and the corresponding stress at the bottom of the wall of each layer of API 650 tank. =====
API 650 storage tank stipulates that if the thickness of the lower wall panel obtained by calculating the anti-overturning moment is greater than the thickness of the API standard 650 welded aluminum storage tanks hydrostatic pressure test (both do not include the corrosion allowance).

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API 620 Steel Oil Tank Bottom and Shell Support
The tank API standard 650 welded aluminum storage tanks under-bottom insulation shall be designed to resist the combined pressures from the product load, the overturning seismic load and the vertical seismic load. These seismic pressures may be combined by SRSS.
The bearing ring under the shell shall be designed to resist the calculated OLE peak compressive force in the tank shell due to overturning (see API 650 oil tank, Section E.6.2.2), including dead and live loads. A 33 % increase in allowable bearing stress is permitted.