Meriam Laminar Flow Elements - Manual (Page 11)

11
Actual Volumetric Flow Rate
1) To obtain actual volumetric flow rate if the inlet temperature is different from standard temperature,
read the flow rate (Q) from the curve corresponding to the corrected DP.
Calculate the viscosity at the flowing temperature using the viscosity equation for the flowing gas.
Then calculate the viscosity correction factor using
µcf =
୴୧ୱୡ୭ୱ୧୲୷ ୡ୭୬ୱ୲ୟ୬୲ ୤୰୭୫ ୡ୳୰୴ୣ/୲ୟୠ୪ୣ
୤୪୭୵୧୬୥ ୥ୟୱ ୴୧ୱୡ୭ୱ୧୲୷ ୟ୲ ୤୪୭୵୧୬୥ ୲ୣ୫୮ୣ୰ୟ୲୳୰ୣ
Multiply Q by the viscosity correction factor µcf. This product will give the flow rate of a particular
gas at the actual flowing conditions.
3) At flowing inlet temperature equal to the standard temperature, read the curve/table directly in
actual volumetric flow rate.