A662 Gr C plates API 650 SUG I tanks
The API 650 is the American standard for welded flat-bottomed vertical API 650 SUG I tanks storage tanks. This standard dictates tank design, manufacture, welding, inspection and installation requirements.
Impact Test Requirements for Oil Storage Tanks Primary ComponentsAll API 650 SUG I tanks primary components of 9% or 5% nickel steel shall be impact tested in accordance with Q.2.2.2 through Q.2.2.4. Impact testing is not required for primary components of austenitic stainless steel, nickel alloy, and aluminum materials. Welds in high-alloy (austenitic) stainless steel shall be impact tested if required by Q.6.3.Impact testing of plates, including structural members made of plate, shall comply with the following:a)Impact test specimens shall be taken transverse to the direction of final plate rolling. b)Charpy V-notch specimens shall be cooled to a temperature of –320°F for A353, A553, and A645 steels for impact testing.
Ultrasonic testing can find the internal defects of API 650 SUG I tanks welding joint, this detection method is very accurate for the internal layer defects of oil tank, but ultrasonic detection is not suitable for the detection of thin-walled storage tank materials. Dye penetrant testing is only suitable for detecting the defects of the surface opening of API 650 SUG I tanks and so on metal oil tanks. The feature of this method is convenient and fast.
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