Vent pipes...

[Externet]

Hello.

 

The flow of a fluid in pipes improves by the use of venting pipes, placed at certain points, as those shown over the roofs in dwellings. They really do work aiding flow. They are not something just to get fumes out.

 

My fluids mechanics text books from the university never mentioned a word about them. Maybe I had the wrong books, but the thing is I never understood the principles of their use, their preferred locations, the effect of their lenghts and diameters.

 

Can anyone explain how they work and why ?

Thanks,

Miguel