Return Pump PVC Question?

[johnptc]

From the other board:

That is 100% true.

???? why

if you increase the output pressure you get more flow.....there is not much of a limit on how much water you can put thru a fitting.....until the pressure blows it apart or the high velocity tears it apart

larger pipes offer less resistance to flow......march pump recommends larger piping than the inlet and outlet sizes to reduce back pressure on the outlet and increase pressure on the inlet......most setups that i see use undersized plumbing......a ggod rule of thumb in not to exceed 5 feet per second flow on the intake and dont exceed 10 feet per second on the output.....slower is better and slower means bigger pipes..........

 

[fishingaddict]

i would assume the smaller return line would push the water out faster.. but still probably equal amount of water. how big is the intake? isnt the return line always smaller than the intake?

 

[johnptc]

i would assume the smaller return line would push the water out faster.. but still probably equal amount of water. how big is the intake? isnt the return line always smaller than the intake?

faster yes..but at lower flow....see some pump performance charts....flow rate goes down with back pressure wether its the height of lift ( head) or pipe restriction ( smaller but faster flow) or long runs of pipe or lots of bends


return is usually smaller..........5 feet per second max on intake and 10fps output....... hence a smaller output size will do

 

[Bud8Fan]

???? why

The guy is just saying that you are not going to change the characteristics of the pump by putting a larger pipe after the discharge. You would actually have to change the discharge size.

 

[CHOMPERS]

man! you guys need to wake up earlier, lol i have been waiting for that since almost 4 am lol.. Hey thanks for the info. I am off to lowes.....

Lowes doesn't open until 7:00am anyway

 

[vanilla__gorilla__]

bigger =better=more flow