API standard 650 carbon steel tank larger than 50 ft in diameter

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

Impact Tests for High Alloys
Impact tests are not required for the high-alloy (austenitic stainless steel) API standard 650 carbon steel tank base materials, nickel alloy based materials, aluminum base materials, and weld deposited for the nonferrous (aluminum) materials. Impact tests are not required for austenitic stainless steel welds deposited by all the welding processes for services of –200°F and above. Austenitic stainless steel welds deposited for service below –200°F by all welding processes shall be impact tested in accordance with Q.6.2 except that the required impact values shall be 75% of the values as given in Q.2.2.2, Item c.

The specifications used in the design of large oil tanks, API standard 650 carbon steel tank mainly include American Petroleum Institute Standard API 650, Japanese Industrial Standard JIS B8501, British Industrial Standard BS2654 and Chinese National Standard GB50341 from a global perspective. The formulas used in each specification are based on the hoop stress in the membrane theory. Each specification is based on the performance characteristics of materials and the construction technology level of their respective countries to determine the allowable stresses and weld coefficients. Therefore, the calculation results of tank wall thickness of API standard 650 carbon steel tank with the same volume are sometimes quite different according to different specifications.

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