API 650 aboveground steel oil storage tanks designed and constructed for elevated temperature service

API 620 Tank Standard Post-heat Treatment (Stress Relief)
The post-heat treatment now performed on pressure vessels is of established value, although the mechanism by which the improvement is realized may be open to debate. Post-heat treatment of API 650 aboveground steel oil storage tanks tank sections when the plate thickness exceeds 11/4 in. is required as stated in 5.25. In special cases, the possibilities of post-heat treatment after erection should be explored. Post-heating an insulated tank may be possible if an ample source of heat is readily available and if the rigidity of the tank is adequate.
The thermal stress-relief treatment performed on pressure vessels is recognized as a means for reducing the probability of brittle failures.

The API 650 is the American standard for welded flat-bottomed vertical API 650 aboveground steel oil storage tanks storage tanks. This standard dictates tank design, manufacture, welding, inspection and installation requirements.

Unqualified welding quality of API 650 aboveground steel oil storage tanks is prone to hidden dangers such as oil tank steel plate cracks and leakage. To avoid this situation as much as possible, it needs to be avoided when the oil storage tank is manufactured. Scientific and reasonable measures are adopted to control the welding quality when welding the API 650 aboveground steel oil storage tanks. How to reasonably control the welding process quality of oil storage tanks?