Head Theory 101
 

I have a pump.
I want to pump water from my pond in the back yard to my front yard.
From back to front, my yard rises, I would guess, about 3 feet.
My pump output is 1.5'' (I think.)

Would the pump work best if I used 1.5'' piping for the run or something
larger like 3 inch?

--
BenignVanilla
Pond Site: www.darofamily.com/jeff/links/mypond
Remove MYFRONTALLOBE to email me.

Head Theory 101
 

It will pump faster if you use 3" pipe. However, a cost benefit
analysis will probably reveal that the cost of 3" pipe is several
times that of 1.5", while the increased flow will be less than 20%.

PlainBill

On Wed, 2 Jul 2003 10:32:07 -0400, "BenignVanilla"
m wrote:

I have a pump.
I want to pump water from my pond in the back yard to my front yard.
From back to front, my yard rises, I would guess, about 3 feet.
My pump output is 1.5'' (I think.)

Would the pump work best if I used 1.5'' piping for the run or something
larger like 3 inch?

Head Theory 101
 

Hi BV:
Most plumbers will tell you to go just one size larger in diameter (ie 2
inches in this case)
When you use piping much larger in size than your pump's designed outflow
diameter, you get turbulent flow which, negates some of the benefits from
reduced friction
If you use a pipe that's too small, and you wind up with flow greater than
8cfm (pvc pipes here), you increase resistance significantly, and therefore
the head. Flows greater than 8cfm can cause premature failure of pvc. The
number may vary with different materials.
BTW, I tried sending you an email, removing the myfrontallobe piece, but
never got a reply. Did you get it?
Happy ponding,
Greg

--


"BenignVanilla" m wrote in
message ...
I have a pump.
I want to pump water from my pond in the back yard to my front yard.
From back to front, my yard rises, I would guess, about 3 feet.
My pump output is 1.5'' (I think.)

Would the pump work best if I used 1.5'' piping for the run or something
larger like 3 inch?

--
BenignVanilla
Pond Site: www.darofamily.com/jeff/links/mypond
Remove MYFRONTALLOBE to email me.

Head Theory 101
 

Thanks Greg...and no, I didn't get the message. We had some problems with
our mail servers the past few days, so I think I missed it.

BV.

"Gregory Young" wrote in message
et...
Hi BV:
Most plumbers will tell you to go just one size larger in diameter (ie 2
inches in this case)
When you use piping much larger in size than your pump's designed outflow
diameter, you get turbulent flow which, negates some of the benefits from
reduced friction
If you use a pipe that's too small, and you wind up with flow greater than
8cfm (pvc pipes here), you increase resistance significantly, and
therefore
the head. Flows greater than 8cfm can cause premature failure of pvc. The
number may vary with different materials.
BTW, I tried sending you an email, removing the myfrontallobe piece, but
never got a reply. Did you get it?
Happy ponding,
Greg

--


"BenignVanilla" m wrote
in
message ...
I have a pump.
I want to pump water from my pond in the back yard to my front yard.
From back to front, my yard rises, I would guess, about 3 feet.
My pump output is 1.5'' (I think.)

Would the pump work best if I used 1.5'' piping for the run or something
larger like 3 inch?

--
BenignVanilla
Pond Site: www.darofamily.com/jeff/links/mypond
Remove MYFRONTALLOBE to email me.