Should a solvent storage tank use a single-flange level gauge or a double-flange level gauge?
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I would like to ask everyone: since the solvent storage tank is equipped with a nitrogen seal and operates at atmospheric pressure, can a single-flange level gauge be used?
When there is a nitrogen seal in the gas phase, and the liquid phase is not viscous nor a high-temperature fluid, then there is no need to use plug flanges or flat flanges; a regular differential pressure gauge will suffice. . . The gas phase side must be connected to the low-pressure end of the differential pressure gauge.
I have a question: What is a “solvent”? I don’t understand it; could you please explain it to me? .
With a nitrogen seal, it is not an open system, so a double-flange level gauge must be used.
According to Baidu: A solvent is a liquid that can dissolve gases, solids, and liquids to form a homogeneous mixture. A solvent is also known as a melting agent, and water is the most widely used solvent.
Since it’s not an open design, why use double flanges? I don’t understand
If it’s not open, there will definitely be pressure inside the tank, which will affect the measurements.
Does that mean that the measurement by a double-flange level gauge is less affected by pressure? I don’t understand this; I’ll learn it*
Both single-flange and double-flange types measure liquid level based on the pressure sensed by the flange diaphragm； In the case of an open-container (or a container with constant pressure), the gas pressure above the fluid remains unchanged; therefore, any change in pressure corresponds to a change in liquid level. In other words, a single flange is sufficient to accurately measure the liquid level. If the gas-phase pressure is unstable and changes, then the signal transmitted to the diaphragm box is a combination of the liquid level change and the gas-phase pressure change; in such a case, a single flange cannot determine which one represents the liquid level change and which one represents the gas-phase pressure change. Therefore, double flanges must be used, as they allow the gas phase pressures to cancel each other out within the diaphragm boxes of the double flanges. If you still don’t understand, ask a middle school student to explain the basic concepts of physics to you.
No, fluctuations in the nitrogen pressure during nitrogen sealing can affect the level measurement results using a single-flange sensor
The effect of double flanges in eliminating gas-phase pressure fluctuations: lol