Water Pumps
- To: "INTERNET:pumpkins@mallorn.com"
- Subject: Water Pumps
- From: B* J* S*
- Date: Fri, 19 Mar 1999 22:38:13 -0500
- Content-Disposition: inline
Ok here comes the technical part of pump sizing.
Yes, regular house water pressure ranges from 50-70 psi and goes through
generally a 3/4" line. I do have a lawn sprinkler system that is fed with
70 psi, 1" line........this has some ass.
To properly size a water pump you need the 'pump curve'. This will show
you how much (gpm) the pump will deliver at a certain head (pressure).
Simple fluid dynamics: as pressure goes up the gpm drops. Vice versa, the
more gpm, the less pressure.
If you are using, for instance a 1" line, I believe the flow rate of 20-30
gpm is plenty at 40-50 psi. Then again I do not have my line and pump
sizing charts here at home. It all depends on your sprinkler head sizes,
total line length, and line elevations from point of start.
The Gould pump sounds to be superb. Remember a centrifugal pump is not a
positive displacement pump meaning that it will build only to a certain
pressure and just continue to spin, not building anymore pressure. And
generally a centrifugal pump will not build extreme pressure. A loop back
to tank with a valve in the line is a good idea to control the pressure
just in case you have to much.
---------------------------------------------------------------------
To sign-off this list, send email to majordomo@mallorn.com with the
message text UNSUBSCRIBE PUMPKINS
