Asking questions about siphon method
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Use the siphon method and the differential pressure method to measure the liquid level in the tank. When the sampling pipe is filled with liquid, open the drain valve below. Will the cooling water in the tank fill the pipe section a marked in the picture with water?
It must be filled with water, and you have to calculate how much to charge!
I think the paragraph A I mentioned to you is just a bit of a trap, and may not be fully filled up.
When the pipe is filled with liquid for sewage discharge, section a is only 300 meters long and must be filled with liquid. The problem is that dissolved gas builds up over the years.
The current situation is like this. There is a water adding valve above section a. During debugging, in order to siphon water from the tank into the pressure guide pipe below, the upper water valve is opened to fill the pipe with water, and then the water valve is closed and put into normal use. However, after a few hours of use, the measured water level will show abnormality, and then the bottom drain valve needs to be opened to drain the water. The water level will be used normally, and the discharged water will be very clean and there will be no bubbles. Then a problem occurs again after a normal period of time, and the sewage has to be discharged repeatedly, and the cause cannot be found.