API 650 mechanically-anchored tanks foundations
The floating roof is the top cover floating on the liquid level, so the sealing performance of API 650 mechanically-anchored tanks API 650 oil storage tank is very important. The floating plate mainly adopts elastic packing, and at the same time, it is compressed with the wall of API 650 oil storage tank with pressure strip around, and fixed with the floating plate with bolts. After the API 650 mechanically-anchored tanks floating plate is lowered to a certain position of about 1.8m, a prop will support the floating plate to keep it in position.
The materials used in the construction of Appendix Q oil tanks may be subject to severe pitting, cracking, or rusting if they are exposed to contaminated test water for extended periods of time. The Purchaser shall specify a minimum quality of test water that conforms to Q.8.3.2 through Q.8.3.8. After the water test is completed, the tank API 650 mechanically-anchored tanks shall be promptly drained, cleaned, and dried.
The most popular standards for API 650 mechanically-anchored 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 650 mechanically-anchored 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 650 mechanically-anchored tanks standards, the calculation results of tank wall thickness are sometimes quite different.
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