What should be displayed if all the liquid inside a double-flange gauge vaporizes?
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Since I’ve just joined a new team, a few nights ago I went out to deal with a level issue related to a double-flange device; the level indicator showed 98%. There was drainage at the pressure measurement points, and both positive and negative pressures resulted in steam being released. The person who was with me said that this was due to process-related factors – the temperature of the fluid inside was too high. It was supposed to be a water level measurement, but the water vaporized, causing the incorrect reading. It was late at night; I was a bit dazed, so I went back. Thinking about it yesterday, if all the water in the tank vaporizes, the pressures from positive and negative forces should be equal, and the liquid level should show 0% – so why does it show 100%?
Excessively high temperatures cause the diaphragm to bulge and deform; as the diaphragms on the upper and lower flanges are affected by temperature to different degrees, this results in the maximum reading being indicated
The changes in the properties of the medium above cause inaccurate display of the liquid level.
At that time, the root valve should have been closed first, followed by opening the upper and lower drain valves, and then waiting for a while to see what happens
Water vapor is discharged through positive and negative pressures; as the static pressure on the negative-pressure side decreases, the reading becomes larger.
Close the isolation valves on both sides, open the drain valve; if the level gauge shows 0%, it is due to process-related reasons
What is discharged is steam, but the liquid level may not be empty; hot water becomes steam when it is released to atmospheric pressure, which can easily lead to misjudgment.
What is discharged is steam, but the liquid level may not be empty; hot water becomes steam when it is released to atmospheric pressure, which can easily lead to misjudgment.
What was said on the 7th floor is correct – what is discharged is steam, but it isn’t necessarily steam inside the liquid level
Changes in the properties of the medium lead to inaccurate liquid level indication
Inside the tank, it is in a liquid state at high temperatures; when it comes out and comes into contact with cooler temperatures, it turns into a gas state. Everyone has explained this very clearly