API 650 larger diameter tanks piping and forgings

Tanks which are designed following rules and guidelines of API 650 are API 650 tanks. API 650 API 650 larger diameter tanks is the governing code for Welded tanks for Oil storage normally operating in the atmospheric pressure range. The code API 650 provides guidelines for design, fabrication, material, erection, and inspection of welded vertical and cylindrical storage tanks. Such API 650 larger diameter tanks Tanks must be above ground with a closed or open top.

Some defects may be found after the regular safety inspection for the API 650 larger diameter tanks. The common API 650 larger diameter tanks defects are: Tank cracks, tank welding defects. The cracks on the base metal, surface and near surface of the tank wall shall be eliminated by grinding with circular arc, and then magnetic particle inspection or re inspection shall be carried out. Cracks in heat affected zone: generally, grinding method is used to eliminate cracks, and magnetic particle or dye flaw detection is used to confirm that there is no crack, and then repair welding or grinding smooth transition.

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 650 larger diameter tanks), then no design or evaluation for ALE is required by these provisions for the inner or outer tank.

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