API 650 flat-bottom oil storage tanks double-flanged, low-type nozzles

In order to prevent the deformation of the bottom of metal vertical storage tank, API 650 flat-bottom oil storage tanks during welding, the number of welders should be reasonably distributed. When welding metal vertical API 650 flat-bottom oil storage tanks, personnel and welding position shall be reasonably allocated according to the actual situation of welding personnel, and random welding is not allowed.

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 650 flat-bottom oil storage 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.

The effect of air pressure on the API 650 flat-bottom oil storage tanks tank walls of the API 650 tank must be considered when the design pressure is greater than 2 kPa.The fixed point method can be used to design the tank wall of atmospheric or micro internal pressure API 650 flat-bottom oil storage tanks storage tank.