Problems with the water seal tank in large tanks
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There are some large tanks containing toxic substances, and to prevent the escape of toxic gases, water seal tanks are used. Does the water in these water seal tanks need to keep flowing continuously, or is it sufficient to fill it once? What problems might arise with water seal tanks in normal use? Please share your thoughts; extra points for helpful answers
It’s not a flow system; at least mine isn’t. Water is added to the tank up to a certain level, and the water is replaced regularly. The issue to be mindful of is the pressure in the tank.
If discharge conditions are available, it is recommended to have a slight overflow
The water in the water seal tank should not keep flowing continuously; it is generally necessary to maintain a certain level of water in the tank, and add water promptly when the water level drops.
How do you see the water level? Do you have glass sight glasses?
How are the water seal tank and the large tank connected?
Previously, a demineralized water tank was built that required isolation from external carbon dioxide as well as from the demineralized water inside; some pipe openings (such as overflow ports and ports for mechanical level gauges) employed a water seal mechanism. At that time, we installed a water supply pipeline at the water seal section, and the system operation and maintenance manual specified the requirements for regular water replenishment. I think this could be used as a reference.
The water seal tank should have an overflow pipe to prevent continuous leakage of water; there should be a specific range for the liquid level, and automatic water replenishment should occur when the level drops below the required threshold.
When the water seal tank is operating normally, there is no water inside it; it has a drain port and an overflow port. When it is not in use, water is filled to a certain level in order to prevent the toxic gases in the larger tank from escaping, as you mentioned. The water seal tank has specific requirements regarding the pressure difference between the inside and outside areas, and this pressure difference is proportional to the height of the water level in the tank