35
MAG
User Manual v2.0
The greater the diameter of the pipe, the higher the speed of the liquid will be required to move the air
pockets away from the flowmeter.
It is also important to understand what kind of effect the water pressure has on the nature of the air pocket
inside the pipe. The lower the pressure in the tube, the greater the size of the air pocket is, and the greater
the effect it will have on the performance of the flowmeter. By increasing the pressure in the duct, the air
pocket will compress, causing fewer problems.
This can be achieved by installing pressure control valves after the flowmeter to maintain constant pressure
in any situation.
One solution is to install the flowmeter on a pipe with an increasing slope so that the entrapped air pocket
will move to the highest point. Then, through special vent valves, the air will be released from the pipe,
maximizing the system capacity.
Fig. 49 | Air pockets inside the pipe
Fig. 50 | Example of pressure control valves
Fig. 51 | Pipe with an increasing slope for application of vent valves
