AptiFlow is an Averaging Pitot Tube and as such generates a differential pressure when placed in a pipe or duct that carries a flowing fluid.

The magnitude of the differential pressure is proportional to half the fluid’s density multiplied by the square of its mean axial velocity.

To transform this into a fundamental flow equation, we can say

Qm ~ csa . (2 . DP . Rho)^.5

The reduced pressure resulting from blockage / dynamic drag of the probe has been determined experimentally. This can be incorporated into our equation above as a k-factor [k]

So now, our fundamental flow equation becomes

Qm = k . csa . (2 . DP . Rho)^.5

Similarly

Qv = k . csa . (2 . DP / Rho)^.5

C = k . (2 . DP / Rho)^.5

Where:

= Mass flow rate [kg/s]

= Volume flow rate [m3/s]

= Mean axial velocity [m/s]

= AptiFlow k-factor

= Pipe cross sectional area [m2]

= Differential Pressure [Pa]

= Fluid density [kg/m3]

AptiFlow offers several key advantages over other types of differential pressure flowmetering:

Fewer straight length requirements

AptiFlow is suitable for flow measurement on a variety of fluids over a wide range of pressures and temperatures.

Typical applications include:

Fresh water

Cooling water

Seawater

Brine

Combustion air

Natural gas

Sour Gas

Methane

Chlorinated water

Petrol

Kerosene

Jet A1

Propane

Ventilation air

Exhaust gas

Hydrocarbon Gas