On Jan 2, 11:10*am, wrote:
On Sat, 02 Jan 2010 11:01:49 -0500, wrote:
On Sat, 2 Jan 2010 08:30:54 -0800, "rb" wrote:

Need review of what horsepower does on pumps.

I have a well, 29' below where the pump will be. * It now has a 2hp Sta-Rite
pump on it.

I'd like to put a 1.5hp Sta-Rite on it, because of economics.

Does the HP of the pump relate to how much suction it has, or does it relate
to the number of sprinkler heads I feed with it?

The answer is all of the above, plus other factors like how long the
pipe runs are, how large diameter pipe, how many GPM the heads are,
what flow rate the well can support, etc. I can tell you this. I
recently had a 1hp submersible installed on a 50ft well. The water
depth is about 40ft below ground level. It serves a 10 zone system,
where the largest zone has 10 heads doing 15GPM.





If it relates to number of heads I feed with it, I know I can get by with a
smaller number of pump HP. * I have 3 sections of 4 heads ea.

A pump doesn't really suck. It just reduces the atmospheric pressure
at the inlet. The lack of atmospheric pressure at the inlet will push
water into the inlet. Atmospheric pressure is about 14.7 pounds per
square foot.

With the maximum 14.7 pounds to work with the practical maximum for
the best of pumps is about 25 feet. This 25 foot design would not be
easy to prime, and would not be easy on the impeller long term.

You would be better served with a submersible or some sort of jet
pump.

All the above was assuming a non jet pump. If your Sta-Rite pump is a
jet pump design the ignore the above.

HP relates to volume not vacuum.- Hide quoted text -

- Show quoted text -