Nominal diameter of API standard 650 self-anchored flat-bottom tanks

Usually, the wind load in the API standard 650 self-anchored flat-bottom tanks construction area should be considered before the tank design and construction. The wind load in the API standard 650 self-anchored flat-bottom tanks construction area has an impact on the stability and economy of the API standard 650 self-anchored flat-bottom tanks. 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 standard 650 self-anchored flat-bottom tanks, the shape of the ladder, the platform, the pipeline and the top cover must be considered.

Inspection of low-pressure storage tank Butt-weldsComplete penetration and complete fusion is required (to the degree mandated by the acceptance criteria for examination method utilized) for welds joining tank wall plates to API standard 650 self-anchored flat-bottom tanks tank wall plates. Examination for quality of welds shall be made using either the radiographic method specified in API 620 standard 7.15.1 and applied in 7.17, or alternatively, by agreement between the Purchaser and the Manufacturer, using the ultrasonic method specified in 7.15.3.1. In addition to the radiographic or ultrasonic examination, these welds shall also be visually examined as specified in 7.15.5. Furthermore, the Purchaser’s inspector may visually inspect all butt-welds for cracks, arc strikes, excessive undercuts, surface porosity, incomplete fusion, and other defects.

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API Standard 650, Welded Tanks for Oil Storage, Thirteenth Edition, has been published to ensure the safety, sustainability, and environmental performance of API standard 650 self-anchored flat-bottom tanks oil storage tanks. The updated standard will help continue operational excellence and trust between operators and manufacturers.