View Full Version : Waterflow in plastic tube

21-04-2004, 04:38 PM
One of our techs asked me today if it's possible to calculate the waterflow (15C entering) through a plastic pipe of 8 mm OD - 6 mm ID (or +/- 1/4 inch ID)with a DP of 3 bar over it and a lenght of 1 m and 5 m.

A practical test could of course tell it straight away but how can it be calculated?


I haven't post in under industrial cooling :D

21-04-2004, 06:05 PM
plastic is a big word peter.

what is the material the plastic pipe is made of?

is it polypropilene, polybutilene or what?

they all have different conditional flow.
at this diameter, they are usualy made for compressed air so I doubt if you can find an answer.


22-04-2004, 09:22 AM
I know Chemi, I think that Reynolds (both for liquid and plastic tubes) comes around the corner for this kind of equations.

But it was justa theoretical question because you can measure it in some minutes via a practical test.

23-04-2004, 01:09 AM
Should be about 9.5 GPM if pressure is constant