ABSTRACT
Tanks are used for the collection of fluid that has passed through a flowmeter being calibrated and can be used to dispense liquid through a flowmeter for calibration. Changes in the height of the liquid could be determined from differential pressure (DP) measurements before and after collection or discharge of liquid. The tank is calibrated by adding known increments of water to the tank and measuring the differential pressure. The DP between the bottom of the tank and the air space the liquid surface is determined by the use of two “bubbler tubes”, one with an orifice near the bottom of the tank and the other with an orifice the surface of the water. Jones has applied the tank volume calibration system to chemical process tanks and has developed a tank volume calibration algorithm to permit inference of liquid volume in a tank from measurements of DP and temperature, and the values of other parameters.
