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Title: Operation Of Orifice Meter Chart Integrators
Author: E. S. Messer
Source: 1965 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1965
Abstract: Gas Measurement by the orifice meter has four equally important areas of instrumentation: the meter run with orifice plate, the pressure recording instrument, the chart integration, and the final volume flow calculation. The simplicity and rugged construction of the meter run makes this type of volumetric measurement the most versatile for the industry. Equally important is the secondary element, the pressure recording instrument, which records on a chart the two variables of the meter run, the static and differential pressures. With the time function introduced by the chart drive, the orifice meter chart becomes a permanent record of the three basic functions for gas or liquid volume calculations. The volume of gas passing through the meter run during the recorded time on the chart varies directly with the sum of the instantaneous square root of the product of the static and differential pressure. The Flow Measurement Company Orifice Chart Integrator performs this continuous multiplication rapidly and accurately with a minimum of effort on the part of the operator. As the operator retraces the static and differential pressure recordings on the chart with the pen arms of the integrator, the sum of an infinite number of square root values of the differential and static pressure product is converted to a digital read-out. This number, when corrected for chart pressure ranges, becomes the chart extension for the equation of volumetric flow through an orifice.

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