A737 grade B plates API 650 unanchored liquid-storage tanks

API 650 Tanks in which liquid fluids are stored and designed to withstand atmospheric pressure operation, less than 18 kPa, or internal pressures not exceeding the weight of the API 650 unanchored liquid-storage tanks roof, with temperatures no higher than 93, 3 C are included in the scope of this design code.

Oil storage tank is an important equipment commonly used in petroleum and petrochemical industry. New API 650 unanchored liquid-storage tanks, metal storage tank must be tested before it can be put into use or put into storage. The common inspection methods of API 650 unanchored liquid-storage tanks include radiographic testing, ultrasonic testing, magnetic particle testing and dye penetrant testing. The parts and operation requirements of these testing methods are different, so they should be selected according to the required characteristics.

API 620 Crude Oil Tank Non-pressure Parts
Welds for pads, lifting lugs, and other nonpressure parts, as well as temporary lugs for alignment and scaffolding attached to primary components, shall be made in full compliance with a welding procedure qualified in accordance with Q.6.1. Lugs attached for erection purposes shall be removed, and any significant projections of API 650 unanchored liquid-storage tanks weld metal shall be ground to a smooth contour. Plate that is gouged or torn in removing the lugs shall be repaired using a qualified procedure and then ground to a smooth contour. Where such repairs are made in primary components, the area shall be inspected by the liquid-penetrant method. A visual inspection is adequate for repairs in secondary components.

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