ASTM A105 forgings API 650 cylindrical tanks

Prevent the storage liquid from impacting the inner wall of the API 650 petroleum storage tank or increase the internal pressure, reduce the corrosion of the tank top and the tank wall, and extend the service life of the API 650 cylindrical tanks storage tank.

Volatilization is the characteristic of oil. Under normal temperature and pressure, as long as the oil is in contact with air, the surface will volatilize. Through scientific analysis and summary, the causes of oil volatilization loss in API 650 cylindrical tanks are: natural ventilation loss, static storage loss, dynamic liquid level loss. In the use of API 650 cylindrical tanks, static storage loss and dynamic liquid level loss are common losses.

API 620 Steel Oil Tank Bottom and Shell Support
The tank API 650 cylindrical 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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