Maximum liquid level of the refined oil storage tank?

For vertical dome storage tanks, the volume utilization factor is generally taken as 0.85, while for floating roof oil tanks it is generally 0.9.

As mentioned above, each storage tank needs to have a safety storage factor to prevent accidents.

The problem is that there is no unified standard for the maximum liquid level; generally, it is considered that the maximum limit should be the position of the foam generator minus the height of the float disk.

In accordance with the tank area design specifications, for arch roofs and internal floating roofs, if the tank volume is 1000 cubic meters or more, a coefficient of 0.9 is applied; if it is less than 1000 cubic meters, a coefficient of 0.85 is used. For external floating roofs and spherical tanks, the coefficient is 0.9. The poster can set the maximum limit based on this.

The following is excerpted from \"Crude Oil Pipeline Transportation Technology\", edited by Huang Chunfang and published by Sinopec Press: 1) Oil tanks must be used within a safe height range: The safe height for dome-shaped oil tanks is 30 cm below the lowest point of the foam generator’s inlet. The safe height of a floating roof tank is 30 cm below the upper limit of the floating boat guide track. The safe height can also be determined using the following formulas: The safe upper limit for the oil tank, Hs, = h – (h1 + h2 + C); the safe lower limit for the oil tank, Hx, = h – h3 + C. Where: h is the distance from the top surface of the measuring hole to the bottom of the tank ； h1 --- Height of the oil measurement hole’s top surface above the top surface of the tank wall ； h2---Height from the lowest point of the foam box inlet hole to the top of the tank ； h3---Height of the oil measurement hole from the top surface of the oil outlet pipe ； C---A constant that takes into account the effect of oil inflow and outflow rates; generally, C is set between 20 cm and 30 cm. Given the actual technical condition of the oil tanks and the specific operating conditions, some of the using departments have also specified their own height requirements for the oil tanks.

Should the wave height of liquid surface oscillation during an earthquake be considered?

For those with a safe capacity, there is not only an upper limit but also a lower limit; there’s also the concept of a coefficient, but I think it depends on practical factors as well as the structure of the tank. Factors such as preventing the tank from being emptied or overflowing should be taken into account.

The factors mentioned on the 7th floor seem to not have been taken into account, and it’s also difficult to determine them. For example, the coefficients are different for earthquakes of magnitude 3 or below, those of magnitude 7 or below, and those of magnitude 7 or above.

Oil tanks must be used within a safe height range: for dome-shaped oil tanks, the safe height is 30 cm below the lowest point of the foam generator’s inlet. The safe height of a floating roof tank is 30 cm below the upper limit of the floating boat guide track. The safe height can also be determined using the following formulas: The safe upper limit for the oil tank, Hs, = h – (h1 + h2 + C); the safe lower limit for the oil tank, Hx, = h – h3 + C. Where: h is the distance from the top surface of the measuring hole to the bottom of the tank ； h1 --- Height of the oil measurement hole’s top surface above the top surface of the tank wall ； h2---Height from the lowest point of the foam box inlet hole to the top of the tank ； h3---Height of the oil measurement hole from the top surface of the oil outlet pipe ； C---A constant that takes into account the effect of oil inflow and outflow rates; generally, C is set between 20 cm and 30 cm. Given the actual technical condition of the oil tanks and the specific operating conditions, some of the using departments have also specified their own height requirements for the oil tanks.