API Std 650 self-anchored tank welding symbols

This standard establishes minimum requirements for API 650 tank material, API Std 650 self-anchored tank design, fabrication, erection, and inspection for ertical. aboveground，closed- and open-top.

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 Std 650 self-anchored tank), then no design or evaluation for ALE is required by these provisions for the inner or outer tank.

Usually, the wind load in the API Std 650 self-anchored tank construction area should be considered before the tank design and construction. The wind load in the API Std 650 self-anchored tank construction area has an impact on the stability and economy of the API Std 650 self-anchored tank. In the area with large wind load, it is safe to design the tank as "squat". When calculating the wind force, the influence of the thickness of the insulation layer of the API Std 650 self-anchored tank, the shape of the ladder, the platform, the pipeline and the top cover must be considered.

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