There are two liquid level transmitters at the bottom of the tower, but their installation heights are different?
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This post was last edited by security on 2012-6-30 09:40. Our plant is constructing a facility for the production of butadiene through oxidation-dehydrogenation. In the process flow diagram, there is a butadiene degassing tower, and this tower has two liquid level transmitters at its bottom; however, their installation heights are different. What do these two liquid level readings represent? I’m utterly confused
Please take a screenshot of the flowchart! Personal guess: Remote transmission of 2 level gauges – this approach is indeed used! It is determined based on the material in your tower bottom! One level gauge is a gauge used to measure the liquid level (such as a double-flange type); another level gauge is an interface level gauge (primarily used to measure the level of layered materials in the bottom of a tower)
For safety reasons, there is usually an on-site level gauge and a remote-level gauge at the bottom of the tower. In the owner’s case, safety is a concern (given that the medium is liquefied gas), so it is possible that two different types of automatic level gauges will be used, without an on-site level gauge. For discussion.
If the process is correct, it should be as the sofa said – the two level gauges serve different purposes.
The situation is as follows: in terms of the process, there is an on-site level gauge, which is connected to a remote-level gauge; these are used to control the flow rate of sodium nitrate. The other one is just a level transmitter without an on-site level gauge; it is used to control the butadiene flow rate. They are all installed at the bottom of the tower. What I don’t understand is that these two level gauges are installed at different heights, one higher and the other lower; why doesn’t the level gauge that is at the lower height indicate a full level?
The process is still confidential at the moment; there is no electronic version. The analysis makes sense as well..........
Even if the installation heights of the two level gauges are different, the zero-level readings of the two instruments will also be different, but what this actually means is…
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This drawing method is indeed not the one used for interface level gauges! I’m sorry, but given my limited knowledge, it’s hard for me to understand what use two level gauges serve! Personal understanding: Since the butadiene degasification tower is used for removing heavy components, butadiene should be collected at the top of the tower! In the bottom of the tower, there should be an organic phase and an inorganic phase, so stratification may occur! It makes sense to use an interface level gauge, as it allows for adjusting the opening degree of the outlet valve at the bottom once it is set up
My skills are limited, so the questions I pose are for reference only. 1. The butadiene degassing unit I have been working with does indeed have two level gauges; one is used to measure the liquid level and the other to measure the interface level. 2. Regarding the flowchart provided by the original poster, I personally suspect that the installation heights of the two instruments are reversed. If it’s moved over, then it’s correct.