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Flow Proving
One method of measuring gas production is to attach a small meter run and an
orifice plate.
High Pressure
Low Pressure
Flow Proving
You can determine the flow rate by measuring the static pressure upstream, the
differential pressure across the orifice plate, gas composition, and the gas flow
temperature.
Flow provers vent the low pressure side to atmosphere or sent to flare. This
simplifies the test, since a differential meter is not needed. Instead, the
differential pressure is determined by using the static pressure and subtracting
the average atmospheric pressure for that area.
To ensure accuracy, it is important to keep the static pressure greater than twice
atmospheric pressure; otherwise changes in atmospheric pressure will affect the
test results.
To program flow proving, you will need the external RTD to collect the
temperature of the gas and one pressure sensor to measure the upstream static
pressure.
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