Is it necessary to account for the hydrostatic pressure of the liquid column when reinforcing the openings in tower nozzles?
Thread Content
May I ask, since the static pressure of the liquid column at the opening can be ignored when it is less than 5% of the design pressure, generally no consideration needs to be given to this static pressure for reinforcing openings in storage tanks. However, towers are usually quite tall; so does one need to take into account the static pressure of the liquid column at their openings?
When the hydrostatic pressure of the liquid column is greater than or equal to 5% of the design pressure, it should be taken into consideration
For towers, especially atmospheric and low-pressure towers, the reinforcement calculations for openings must take into account the net liquid column pressure. Based on experience, when calculating the strength of openings in the middle and lower sections of the tower based on its height, the hydrostatic pressure at these locations usually exceeds 5%, so it is necessary to carry out accurate calculations.
I took another look; it might also depend on the medium used during work. If it’s operating normally with gas, it seems like there’s no need to fill it. If it’s all liquid, it needs to be filled. But in most cases, when it is operating normally, there will be a layer of liquid at the bottom along with other gases; in such situations, the static pressure should be determined based on the highest liquid level during normal operation. Using the vertex-based liquid column measurement is a bit conservative
This needs to be considered based on the actual circumstances; of course, only liquid materials require such consideration, and the static pressure of the liquid column must be calculated based on the density of the material.