Regarding the issue of liquid seals
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This post was last edited by sunjl1981 on 2013-1-6 at 23:16. Our plants are equipped with liquid seals; for example, there are liquid seals in the overflow pipes connecting one tower to another, between the acid pipes leading from the hydrochloric acid synthesis furnace to the hydrochloric acid storage tank, and also in the chlorine outlet pipelines of the water mist collectors. What is the function of a liquid seal? Could you explain it in detail? ? Thank you! # hcbbs
The last edit to this post was made by I’m Hanhan on 2009-9-16 at 16:27. 1. The function of a liquid seal is to balance pressures, enabling automatic material transfer or discharge even when there is a difference in pressure. For example, the liquid seal for transferring material between towers, and another example is the liquid seal on hydrogen pipelines, which serve to prevent gas from passing through and to drain liquid. 2. Liquid seals can be either positive or negative, and can be selected according to the requirements of the process ； 3. The working principle of the liquid seal can be summarized in one sentence: it utilizes the difference between the liquid level height inside the liquid seal probe and the liquid level height outside the probe to achieve equilibrium ； 4. A positive liquid seal occurs when the liquid level inside the probe is lower than the liquid level outside the probe, while a negative liquid seal occurs when the liquid level inside the probe is higher than the liquid level outside the probe. 5. You can refer to the posts on liquid chlorine sealing in the forum. http://bbs.hcbbs.com/thread-540386-1-1.html
Is there anyone else who can give some advice? Thank you
1# Sponge hm explained it in great detail on the second floor. Another point is that a liquid seal, as the name implies, serves to seal things shut. Making proper use of liquid seals is very helpful for production.
The liquid level serves as a seal, preventing the medium inside the system from leaking outside under normal operating pressures; at the same time, it prevents overpressure from occurring in the event of system abnormalities, as there would be no protective measures in such cases. In other words, when the system pressure becomes excessively high, the water seal may break and allow fluid to escape – this is what is meant by positive and negative water seals； The negative pressure water seal does the exact opposite: it maintains a low pressure within the system under normal conditions, but when an abnormality occurs and the pressure drops too low, the system draws in air from the outside through the water seal to compensate, thereby preventing the system from becoming a vacuum that could lead to damage to equipment or pipes!
For some pipes with a larger DN, such valves may need to be custom-made, and the cost will naturally be high. However, by using a liquid seal, this problem can be solved quite easily at a lower cost