Steel plate for shells of API Std 650 cylindrical tanks

API 650 "welded storage tanks" API Std 650 cylindrical tanks is a standard developed and issued by the American Petroleum Institute (API), which specifies the minimum requirements for the design, manufacture, installation and inspection of welded storage tanks.

The inner and outer tanks may be decoupled for seismic design of the tank and anchorage and assumed to act independently. However, if the inner and outer tanks API Std 650 cylindrical tanks are supported by a common foundation, the seismic foundation loading shall be calculated using the lesser response modification values for either the inner tank or outer tank for both tanks and a dynamic analysis shall be performed to determine the combined effect.
Allowable Stresses: For Appendix R tanks, design allowable stresses shall be per API 620 large low pressure storage tank, Section R.3.3.

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

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