The lowest design temperature of API Std 650 cylindrical liquid-storage tank

For floating roof API 650 tanks, the net working capacity is the liquid volume contained between the API Std 650 cylindrical liquid-storage tank maximum operating level (300 mm below rim for metallic type seals and 600 mm below rim for fabric type seals) and the minimum operating level (API 650 tanks roof supports clearing the tank bottom by 25 mm while set at the operating position).

Material for the outer tank API Std 650 cylindrical liquid-storage tank and for the roof that contains the vaporized liquefied gas but is primarily subjected to atmospheric temperatures may conform to one of the following:
a)Table 4-1 for design metal temperatures down to –35°F (lowest 1-day mean ambient temperature of–35°F) without impact test unless they are required by Table 4-1 or by the Purchaser.
b)Table R-3 for design metal temperatures down to –60°F without impact tests unless they are required by Table R-4 or by the Purchaser.

Deformation of the welding seam of the API Std 650 cylindrical liquid-storage tank is a common quality problem during the actual use of the API Std 650 cylindrical liquid-storage tank, which easily causes the tank body to leak and affects the safety of the oil storage tank. The welding seam deformation of the API Std 650 cylindrical liquid-storage tank is mainly caused by the lack of reserved welding seam gap and irregular operation. The oil storage tank has not reserved the corresponding weld gap, resulting in deeper root removal during the front welding activity. The heat output of the weld will increase under the influence of a long time, and the deformation of the weld will gradually become serious.

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