API Std 650 flat-bottom steel tanks designed without anchorage

One of the most widely used design codes is the API 650 Standard, from the American Petroleum Institute. The main objective of this standards API Std 650 flat-bottom steel tanks is, through the requirements contained in its various sections, to facilitate the purchase and construction of vertical, aboveground, welded fabricated tanks assuring that required safety regulations are met.

The increased uplift described in API Standard 620 tank Appendix Q is intended to apply to the size of the ringwall and foundation but not the anchorage. For tanks with an internal design pressure of 1 lbf/in.2 gauge and over, the uplift, if any, shall be calculated under the combined conditions of 1.25 times the internal design condition plus the design wind load on the API Std 650 flat-bottom steel tanks shell and roof.

When the day light gradually decreases, the temperature of oil in the API Std 650 flat-bottom steel tanks will also decrease, the evaporation speed will gradually slow down, and the pressure in the API Std 650 flat-bottom steel tanks will also decrease. When the pressure in the API Std 650 flat-bottom steel tanks is lower than the negative pressure rating of the breathing valve, the outside air is sucked into the API Std 650 flat-bottom steel tanks through the open vacuum valve, which is the "suction" process of the oil tank.

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