API 650 aboveground welded storage tanks water drawoff sumps

During heavy rain, closely observe the change of the water level in the storage area of the API 650 aboveground welded storage 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 650 aboveground welded storage tanks area to avoid lightning accidents. Observe the groundwater level of the API 650 aboveground welded storage tanks area at any time, clean and dredge the drainage ditch in time to ensure unobstructed drainage, and prevent the bottom of the API 650 aboveground welded storage tanks from leaking and rusting due to untimely drainage.

Large Steel Storage Tank Anchorage
In addition to the loads in API 620 oil storage tank Q.4, Q.5.1, and Q.5.2, the anchorage for the tank that contains liquid, whether it be a single-wall tank or the inner tank of a double-wall tank, shall be designed to meet the requirements of Q.3.6.2 through Q.3.6.5. The anchorage shall accommodate movement of the tank wall and bottom caused by thermal changes. For anchored flat-bottom tanks, the anchorage shall be designed as described in Q.3.6.4.1 through Q.3.6.4.3.

For floating roof API 650 tanks, the net working capacity is the liquid volume contained between the API 650 aboveground welded storage 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).

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