Self-supporting umbrella roof API standard 650 cylindrical liquid-storage tank
The most popular standards for API standard 650 cylindrical liquid-storage tank are API Std 650, JIS B8501, BS2654, GB50341, etc. The formulas used in each standard are derived from the hoop stress calculation formula of membrane theory. Combined with the stress characteristics of API standard 650 cylindrical liquid-storage tank, plus the allowable stress, weld coefficient and additional wall thickness, the wall thickness calculation formula is complete. The allowable stress and weld coefficient are determined according to the material performance characteristics and construction technology level of each country. According to different API standard 650 cylindrical liquid-storage tank standards, the calculation results of tank wall thickness are sometimes quite different.
Heat-affected zone impact specimens shall be taken across the weld and as near the surface of the material as is practicable. The API standard 650 cylindrical liquid-storage tank material specimens shall be of sufficient length to locate the notch in the heat-affected zone after etching. The notch shall be cut approximately normal to the material surface to include as much heat-affected zone material as possible in the resulting fracture. Impact test specimens shall be cooled to the temperature stated in Q.22.
The interior of API 650 storage tanks to be internally lined or coated must have all edges rounded to a minimum of 3 mm radius. Internal welds must be completely seal welded, ground smooth, and free from API standard 650 cylindrical liquid-storage tank surface porosity, pockets, and high spots. Remove weld spatter. Vendor as specified on API 650 storage tanks drawing must perform additional surface preparation.
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