AptiFlow Technical

Operating principle

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:

Qm
QV
C
K
csa
DP
Rho

 = 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]

Advantages

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

Low pressure loss

Fewer straight length requirements

Lower installation cost

More stable performance

Applications

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