API standard 650 mechanically-anchored flat-bottom tanks bleeder vents

The safety inspection of atmospheric storage tank, API standard 650 mechanically-anchored flat-bottom tanks is divided into external inspection, internal and external inspection and comprehensive inspection. External inspection shall be conducted at least once a year, internal and external inspection shall be conducted at least once every three years, and comprehensive inspection shall be conducted at least once every six years. The safety inspection of large atmospheric storage tanks, API standard 650 mechanically-anchored flat-bottom tanks requires special attention: the parts where the liquid level often fluctuates, the parts that are susceptible to corrosion, and the parts that are deformed and worn during use should be checked.

Density of API standard 650 mechanically-anchored flat-bottom tanks Liquid Stored
The density of the liquid stored shall be its maximum density within the range of design temperatures, but no less than 29.3 lbf/ft3 for methane, 34.21 lbf/ft3 for ethane, and 35.5 lbf/ft3 for ethylene.
Design Metal Temperature
The design metal temperature of each component exposed to the liquid or vapor being stored shall be the lower of the temperatures specified as follows: The design metal temperature of the components of the API 620 single-wall tank or the inner tank of a double-wall tank shall be the minimum temperature to which the tank contents shall be refrigerated, including the effect of subcolony at reduced pressure.

The internal floating plate of internal floating roof tank of API 650 tank is different from that of open floating plate of API standard 650 mechanically-anchored flat-bottom tanks External floating roof tank of API 650 tank, so it is impossible to have rain and snow load.

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