API 650 low-alloy steel tanks adjustable legs

The API 650 low-alloy steel tanks must go through strict inspection before putting into use. Inspection of plate groove of API 650 low-alloy steel tanks, vertical oil tank: After finishing the groove processing of oil tank plate, it is necessary to conduct dye penetrant inspection on the groove. This process is mainly aimed at the hard damage of groove in the machining process and the defects of the plate itself. If any defect is found, it shall be processed again until the defect disappears.

The tank 20-in. inside-diameter nozzle shown in Figure F-6 is located in solid plate in the sidewall of a cylindrical storage tank 148 ft in diameter in an area where the thickness of the wall plate, tw, is 11/2 in. A corrosion allowance of 0.10 in. is required on all surfaces of the tank exposed to the stored liquid. The total internal pressure, Pl + Pg, at the center of the opening is 24.9 lbf/in.2 gauge. The thickness of the API 650 low-alloy steel tanks wall plate, t, required by 5.10.3 for the latitudinal unit forces, T2, acting at this level is 1.44 in.

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

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