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Flowbench Math
Based on Work by Peter Burgess - Revised April 16, 2014
Valve Diameter in Millimetres
Reading on Manometer X in Millimetres
Orifice Plate Pressure Drop in mm of Water
Reading on Manometer Y in Millimetres
Test Piece Pressure Drop in mm Water
Temperature Reading in Degrees Centigrade
STP 15 Dgrees Centigrade
Atmospheric Pressure Reading in Millibars
STP 1013.25 mb Pressure
Vapour Pressure of Water at Test Temperature in N/m2
Relative Humidity as a Decimal Pointage
Orifice Diameter in Millimetres
Flow Bench Variable
The airflow is
c.f.m. at 25 inches H2O.
The airflow is
c.f.m. at 10 inches H2O.
The airflow is
c.f.m. at 15 inches H2O.
The airflow is
c.f.m. at 28 inches H2O.
The coefficient of discharge is