Design of under-bottom connections for API standard 650 low-alloy steel tanks

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 low-alloy steel tanks External floating roof tank of API 650 tank, so it is impossible to have rain and snow load.

After using for a certain period of time, it is necessary to check the corrosion protection of the metal oil tank and paint the outer wall of the API standard 650 low-alloy steel tanks with anti-corrosion paint. The inlet and outlet valves of API standard 650 low-alloy steel tanks shall be inspected and maintained regularly to ensure they are in good condition. Oil tank will produce a lot of dirt when it is stored for a long time. Usually, the cleaning cycle of metal oil tank is about three to five years.

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 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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