Ammonia Process Technology Exchange Area [Daily Question 2009-03-03]
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Ammonia Process Technology Exchange Area [Daily Question 2009-03-03] How to calibrate the ammonia tank level gauge? What issues should be paid attention to?
The moderator is talking about calibrating double flange or differential pressure automatic indicating level gauge, right? You can directly compare and check with the glass plate level gauge on the liquid ammonia storage tank. If a glass plate liquid level gauge is not used, then the liquid ammonia in the storage tank has to be emptied, quantitatively filled with water, and the liquid level gauge can be calibrated through calculation according to the shape of the storage tank.
To consider the effect of temperature on the volume change of liquid ammonia, I agree with the quantitative water filling method. However, summer and winter must be calculated using density.
The liquid ammonia storage tank level gauge displays inaccurately because it is calibrated as follows:: Cut off the gas and liquid phase root valve of the liquid level gauge, then open the drain valve at the root of the liquid level gauge, drain out the liquid ammonia in the liquid level gauge, slightly open the gas phase root valve and blow down the liquid level gauge tube, then close the drain valve, slowly open the liquid and gas phase root valve, use a magnet to calibrate the float and put it into use.