Flow factor and its derivation


A ‘flow factor’ is to multiply the flow transmitter signal measured on a 0-10 square root or 0-100 linear scale to get the flow calculated by flow metering. This is used due to the standardization of the transmitters signals, to 20-100 kPa or 4-20mA.
The following points are considered for flow calculation and in deriving the flow factor:

D = pipe diameter,
Small d = orifice diameter
Service = gas or liquid
PI = operating pressure
DP = Transmitter differential pressure
T =operating temperature
Small p= density or molecular weight
Small v= viscosity