6063 aluminum tube API standard 650 carbon and low-alloy steel tanks

For floating roof API 650 tanks, the net working capacity is the liquid volume contained between the API standard 650 carbon and low-alloy steel tanks 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).

During heavy rain, closely observe the change of the water level in the storage area of the API standard 650 carbon and low-alloy steel tanks. If the water level rises to the dangerous range, drain the water immediately. There are more thunderstorms in heavy rain, and lightning protection devices should be installed in the API standard 650 carbon and low-alloy steel tanks area to avoid lightning accidents. Observe the groundwater level of the API standard 650 carbon and low-alloy steel tanks area at any time, clean and dredge the drainage ditch in time to ensure unobstructed drainage, and prevent the bottom of the API standard 650 carbon and low-alloy steel tanks from leaking and rusting due to untimely drainage.

Butt-welded joints used to fabricate large steel storage tank fittings shall be completely radiographed. Lines carrying liquid shall be hydrostatically or pneumatically pressurized at a minimum pressure of 35 lbf/in.2 and API standard 650 carbon and low-alloy steel tanks butt welded joints shall be simultaneously visually examined (hydrostatic) or solution film tested (pneumatic) for tightness. If manufactured pipe has been hydrostatically tested previously to ASTM requirements, then only circumferential welds need to be examined.

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