[Poppy]

If a 1 inch submersible pump can deliver 2000 gals per hour lifitng the water 6 inches, but drops to 1000 gals per hour lifting a column of water 8 feet in a one inch hose, I'm thinking that it will deliver the same 1000 gals per hour in a 1 1/2 or 2 inch hose. Am I right?

[Dominick]

That is completley over my head
There is a chart at the end of the article.
Knowledge Base, Pumps Information, Kiwi Pumps, Manufacturers and exporters 3" Submersible Pumps, 3" borehole pumps manufacturer, 4" borehole Submersible Pumps, 6" borehole Submersible Pumps, 8" borehole Submersible Pumps, Openwell pumps, Pond pumps,e

[Poppy]

Thanks Dom, but that wasn't helpful. This isn't an easy question to google.

Here is my thinking.
If you look at the first diagram here.
HowStuffWorks "A Hydraulic System"

and consider the left piston as the outlet of the pump, say 1 inch and the right piston as the diameter of the hose, also one inch, one can conclude that the water will come out of the hose at the same volume, and rate as it comes out of the pump.

Now if you look at the second diagram, I believe that one can conclude that the water will come out of the larger diameter hose, appearing to be pouring out, rather than shooting out, but that the same overall volume will come out.

That however is the question... am I correct?

[Dominick]

The only time I was into anything like that is when I converted to a hydralic clutch and used a brake master cylinder at first but had to redo it and use a hydralic clutch master cylinder because the piston size wasn't compatible and it pushed like a rock using a brake cylinder.
So I'll pass to a higher brain power.

[Poppy]

Gee... that seems pretty inventive

[Canuck623]

The volume stays the same, just the pressure decreases. Same if you went to a 1/2 inch hose. The amount of fluid would stay the same but the resulting pressure increase would cause it to spray farther.

[D.Acker]

Trying to get water out of the office?

[Poppy]

Originally Posted by D.Acker

Trying to get water out of the office?

Well, yeah, actually, I did that Sunday. But working with different size pumps, and not really having the correct size hose for any of them, got me thinking.

Originally Posted by Canuck623

The volume stays the same, just the pressure decreases. Same if you went to a 1/2 inch hose. The amount of fluid would stay the same but the resulting pressure increase would cause it to spray farther.

Yeah thanks Canuck623, I see that you agree with my thought regarding going to a larger size hose, but I have to respectfully dissagree about the volume staying the same if I went to a smaller hose. Perhaps in a perfect world that would be true, but since the force behind the water would stay the same, the added friction of the narrower hose, and turbulence of the restriction (going from larger to smaller) would cause a reduction in the overall volume. Honestly I don't know what percentage, but I'm sure it would be less. For all intents and purposes, it may be negligible.

A corollary reason for the question is - would a 3/4 inch 12 v sumersible pump be able to push water up a 1 1/2 inch pipe to the same, or near the same height it would be able to do if it was connected to a 1/2 inch pipe? Each pump has height limitations based upon the hp of the motor, and the effeciency of the pump.

My friend has a sump pump in his basement, that is needed when ever there is rain. He is too foolish, or cheap to hook up a battery back-up system for $250.
I'd like to encourage him to pipe in a submersible bilge pump $35 and run wires out the window with alligator clips to his car battery, and turn it on and off manually as needed. Maybe even put in a float switch. Do it all for about $50. The job would be neater if he could tap into the pipe that is used for the 1 1/2 inch pump.

I find it astounding how many people have sump pumps without a battery back-up.

[Boghog]

This should help explain some of your questions.

HOW TO design a pump system

[Canuck623]

I doubt it would lift it because of the increase weight of the column of water.