ISO 630 grade E355 plates API standard 650 mixed material tanks

API 650 petroleum storage tank body design is mainly the design of tank bottom, API standard 650 mixed material tanks tank top and tank wall, and the design of tank wall is particularly important. As the main pressure bearing part of API 650 petroleum storage tank, the tank wall bears loads including liquid pressure, wind pressure, seismic load, opening stress, etc. The calculation of such loads is explained in detail in various API standard 650 mixed material tanks storage tank design standards. But in addition, the API 650 petroleum storage tank wall also bears the push-pull force and torque of the connected pipeline.

Usually, the wind load in the API standard 650 mixed material tanks construction area should be considered before the tank design and construction. The wind load in the API standard 650 mixed material tanks construction area has an impact on the stability and economy of the API standard 650 mixed material tanks. In the area with large wind load, it is safe to design the tank as "squat". When calculating the wind force, the influence of the thickness of the insulation layer of the API standard 650 mixed material tanks, the shape of the ladder, the platform, the pipeline and the top cover must be considered.

API 620 Steel Oil Tank Bottom and Shell Support
The tank API standard 650 mixed material 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.

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