API Std 650 flat-bottom oil storage tanks sliding friction

After using for a certain period of time, it is necessary to check the corrosion protection of the metal oil tank and paint the outer wall of the API Std 650 flat-bottom oil storage tanks with anti-corrosion paint. The inlet and outlet valves of API Std 650 flat-bottom oil storage tanks shall be inspected and maintained regularly to ensure they are in good condition. Oil tank will produce a lot of dirt when it is stored for a long time. Usually, the cleaning cycle of metal oil tank is about three to five years.

API 620 Steel Oil Tank Bottom and Shell Support
The tank API Std 650 flat-bottom oil 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.

This standard applies only to API 650 tank API Std 650 flat-bottom oil storage tanks whose entire bottom is uniformly supported and to API 650 tank in non-refrigerated service that have a maximum design temperature of 93°C (200 °F) or less.

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