The contents gauge chart on my tank does not match the liquid level gauge indication when liquid begins to flow out of the trycock valve. Why not?
A. The contents chart is calculated with liquid saturated at 0 psig. The liquid in your tank is saturated at a pressure higher than 0 psig. Higher pressure liquid is less dense and therefore creates a “taller” column of liquid out of the same (mass) amount of liquid. This less dense and taller column of liquid will reach the trycock level sooner. Therefore, there is actually less mass in the tank then the chart indicates. For repetitive situations where the known operating (or saturation) pressure differs significantly, you can change the contents chart with one calculated for a different pressure.
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