API 650 welded steel oil storage tanks shell flanges

Floating roofs shall comply with API standard 650, Appendix C (Attachment 01) or with the API 650 welded steel oil storage tanks requirements as layed (laid )down in the national Chinese specifications SH3046-92 and GBJ128-90.

Anti corrosion of API 650 welded steel oil storage tanks:
After using for a certain period of time, it is necessary to check the corrosion protection of the API 650 welded steel oil storage tanks. If necessary, the outer wall of the metal oil tank should be painted with new anti-corrosion paint to ensure that the outer wall of the API 650 welded steel oil storage tanks does not fall off and has good waterproof and rust resistance.
API 650 welded steel oil storage tanks cleaning:
The long-term use of API 650 welded steel oil storage tanks will produce impurities on the tank wall and deposit on the tank bottom, resulting in tank corrosion to leakage. According to the safety standard of oil tank, the API 650 welded steel oil storage tanks shall be cleaned and derusted regularly to ensure the quality of oil stored and the safety of oil tank equipment.

Preheating should be performed by heating and maintaining this heat in appreciable lengths of the joint to be welded, preferably using a strip burner with a mild flame rather than a harsh flame such as that from a cutting torch. Electrical strip heaters are available and have been found to be satisfactory. The preheat of 300°F should be checked with a temperature-sensitive crayon, or similarly accurate means, so that the steel 4 in. (or four times the API 650 welded steel oil storage tanks plate thickness, whichever is greater) on each side of the joint will be maintained at the minimum preheat temperature. Ring burners or heaters are recommended for nozzle and manway welds. At no time during the welding should the base metal fall below a temperature of 300°F.

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