API standard 650 flat-bottom oil storage tanks shell-plate
storage tanks API standard 650 flat-bottom oil storage tanks designed in accordance with the rules and guidelines of API 650 are called API 650 storage tanks. API 650 is a control rule for welded storage tanks that work normally in the normal pressure range.
Temporary Openings after Hydrostatic TestWhen approved by the Purchaser in writing, and only in the case of tanks which when complete have no shell penetrations, it is permitted to restore by welding up to four temporary shell openings after the hydrostatic test in accordance with the provisions of this section. Each temporary opening shall be restored by the insertion of a shell plate that matches the thickness and specification of adjacent shell material, and is welded into place with full fusion butt-welds. The API standard 650 flat-bottom oil storage tanks insert plate shall be round with diameter no less than 24 in. and no greater than 42 in.
The most popular standards for API standard 650 flat-bottom oil storage tanks 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 flat-bottom oil storage tanks, 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 flat-bottom oil storage tanks standards, the calculation results of tank wall thickness are sometimes quite different.
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