API standard 650 vertical welded storage tanks shell reinforcing plates

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API standard 650 vertical welded storage tanks belongs to metal oil tank. Metal oil tank is a kind of vessel made by welding steel plate. The common shapes of metal tank are vertical metal tank, horizontal metal tank and spherical metal tank. The advantages of API standard 650 vertical welded storage tanks etc. metal oil tank are good sealing, not easy to leak, can be installed with heating and insulation function, metal tank can withstand high internal pressure, large vertical metal tank such as API standard 650 vertical welded storage tanks also has the characteristics of small floor space and large storage capacity.

API 620 Crude Oil Tank Pneumatic Pressure
An air pressure equal to 1.25 times the pressure for which the vapor space is designed shall be applied to the enclosed space above the water level. In the case of a double-wall tank with an open-top inner tank, where the air pressure acts against the outer tank and the inner tank is thus not stressed by the air pressure, the inner API standard 650 vertical welded storage tanks may be emptied of water before the pneumatic pressure test begins. The test pressure shall be held for 1 hour.