[Market-farming] well storage tank?

Bill Bradshaw billbradshaw at hughes.net
Sun Jun 3 21:01:05 EDT 2007

Willie, an electric pump motor will use more amps pumping open discharge 
(out on the ground) than pumping under pressure ( say at 40 PSI) put your 
amp meter on and check it.  RPM stay the same. Bill

----- Original Message ----- 
From: "Willie McKemie" <mf at austinfarm.org>
To: "Market Farming" <market-farming at lists.ibiblio.org>
Sent: Sunday, June 03, 2007 1:12 PM
Subject: Re: [Market-farming] well storage tank?

> On Sat, Jun 02, 2007 at 04:32:04PM -0500, Bill Bradshaw wrote:
>> Our well is used with no tank at all. We turn on the pump, and pump into 
>> the main line into the layflat. Well cap. is 50 GPM. Each zone area uses 
>> 40 GPM. To control the pressure on the drip line we have a gate valve on 
>> the lay flat. After the drip lines are charged the valve is pinched down 
>> to control the pressure. The pump holds the back pressure. Backpressure 
>> will not hurt the pump. Matter of fact, in using a pump what you pay for 
>> in power use is volume. Volume = more amps pressure = less amps. Bill
> Well..... maybe I'm full of it, but I haven't known of a pump with such
> behavior.  My mental model of an electric pump is that it draws a fixed
> amount of current when running and you can choke it down to produce as
> little water as you want but you still use that fixed amount of
> electricity.
> I know a peach grower that has a big diesel engine driving his pump.
> He is able to throttle the engine up and down to produce the desired
> quantity of water.  But all the electric pumps I know of are fixed
> speed.
> Since my plumbing is only good for 60 psi or so, I start to break
> things when I allow pressure up to that level.
> -- 
> Willie, ONWARD!  Through the fog!
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