API 650 self-anchored flat-bottom steel tanks seismic use group ii

Oil, Gas, Chemical, Water, and Bio-Fuel storage. Maximum of the most common welded steel tanks used in industry are designed following API 650. Tanks typically found in Refinery API 650 self-anchored flat-bottom steel tanks tank farms, Terminals, Pipelines, and other process facilities use these tanks.

Deformation of the welding seam of the API 650 self-anchored flat-bottom steel tanks is a common quality problem during the actual use of the API 650 self-anchored flat-bottom steel tanks, which easily causes the tank body to leak and affects the safety of the oil storage tank. The welding seam deformation of the API 650 self-anchored flat-bottom steel tanks is mainly caused by the lack of reserved welding seam gap and irregular operation. The oil storage tank has not reserved the corresponding weld gap, resulting in deeper root removal during the front welding activity. The heat output of the weld will increase under the influence of a long time, and the deformation of the weld will gradually become serious.

The tank shall be filled with water to the design liquid level unless height is limited as noted in API 620 standard Q.8.1. After the tank is filled with water and before the pneumatic pressure is applied, anchorage, if provided, shall be tightened against the hold-down brackets. All welds in the API 650 self-anchored flat-bottom steel tanks shell, including the corner weld between the shell and the bottom, shall be visually checked for tightness.

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