API standard 650 ambient temperature tanks roof load

Aftershock Level Earthquake (ALE)
This design case shall be applicable only when regulations or project documents specifically require the tank system to be designed or evaluated for aftershocks.
If the outer tank is not designed as a secondary containment (i.e. it serves as vapor barrier and pressure boundary only and is not constructed of API 620 material suitable for the inner tank API standard 650 ambient temperature tanks), then no design or evaluation for ALE is required by these provisions for the inner or outer tank.

API 650 internal floating roof API standard 650 ambient temperature tanks tank can be used to store gasoline, jet fuel and other volatile oil products, as well as aldehydes, alcohols (methanol, ethanol), ketones (acetone), benzene (benzene, toluene, xylene, styrene) and other liquid chemicals.

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In order to prevent the deformation of the bottom of metal vertical storage tank, API standard 650 ambient temperature tanks during welding, the number of welders should be reasonably distributed. When welding metal vertical API standard 650 ambient temperature tanks, personnel and welding position shall be reasonably allocated according to the actual situation of welding personnel, and random welding is not allowed.

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