API standard 650 mechanically-anchored flat-bottom tanks seismic use group

The water dissolved in the oil will be separated out from the oil stored in the API standard 650 mechanically-anchored flat-bottom tanks for a long time, and the acidic water layer will appear at the bottom of the API standard 650 mechanically-anchored flat-bottom tanks for a long time, which will accelerate the corrosion of the API standard 650 mechanically-anchored flat-bottom tanks and cause the wall thinning and even leakage. With the increase of service life, the API standard 650 mechanically-anchored flat-bottom tanks must be inspected and cleaned regularly to check the hidden danger.

Welding of API 620 Steel storage tank Primary Components
The following primary components shall be joined with double butt-welds that have complete penetration and complete fusion except as noted:
Longitudinal and circumferential shell joints and joints that connect the annular bottom plates together. When approved by API standard 650 mechanically-anchored flat-bottom tanks Purchaser, these may be welded from a single side provided temporary non-fusible backing is used with complete penetration and complete fusion. Both sides of the joint shall be 100% visually examined as specified in 7.15.5.

API 650 Tanks in which liquid fluids are stored and designed to withstand atmospheric pressure operation, less than 18 kPa, or internal pressures not exceeding the weight of the API standard 650 mechanically-anchored flat-bottom tanks roof, with temperatures no higher than 93, 3 C are included in the scope of this design code.

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