Pressure relief issues in storage tanks
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New user seeking help: The pressure in the front-end storage tank is 1.3 bar. This pressure is directed to tanks A and B through a tee. The vent valves of tanks A and B are opened, and ventilation is used; the vent lines are connected to a collector, which in turn leads to the alkali scrubber. Everything works normally under normal conditions. Today, the pressure in both storage tanks has remained at 1.3 bar, and it’s not possible to reduce it by exhausting air. This results in equal pressure in the two tanks, so discharge can only occur through gravity, and it is very slow. Upon inspection, the vent lines leading to the absorber and those leading to the alkali scrubber are fully unobstructed. The tee at the front end was not removed for inspection, and the exhaust ventilation is operating normally. I would like to ask: if the front part of the AB tank is blocked, could this cause such a situation?
It’s best to draw a diagram. What is the pressure in the alkali scrubber tower?
If the front part of the AB tank is blocked, it shouldn’t be okay if the fan is working properly. Did you check the fan blades to see if they are rotating?
Yes, the fan is working fine. By removing a section of the exhaust pipe and then turning on the fan, suction is still generated
What about the pipeline in front of the exhaust fan? Has it been checked?~~ Also, is the alkali scrubber working properly? ~~
If the front section is blocked, the pressure in tanks A and B at the back will not be 1.3 bar; it will definitely be lower. Could it be that the air supply volume to the tank ahead is too high, or that the exhaust flow behind the fan is poor?
If there is no problem with the fan, it’s likely an issue with the pipes. Pressurize the equipment and then release the pressure gradually to confirm that the pipelines are unobstructed. Additionally, it is necessary to take into account the inherent properties of your materials, as well as whether there are U-shaped bends in the pipelines; prolonged liquid foam entrainment can lead to a liquid seal phenomenon.
The alkali scrubber tower has not been inspected yet, and the pipelines at the front end of the fan are all in good condition
Thank you for the reminder; I’ll go check it
It’s probably caused by a blocked pipe; listen to whether the sound before and after the fan is different, and compare it with the normal condition