Head Loss?

ShadowStryder

Bronze Tier VIP
MFK Member
Apr 4, 2007
6,365
970
749
Nunya
How much head loss will occur when reducing from 1" to a 3/4" bulkhead return?
 

ShadowStryder

Bronze Tier VIP
MFK Member
Apr 4, 2007
6,365
970
749
Nunya
Should have added that. This is the setup,

I have plumbed my 600 with dual Laguna 4280s.I will have 5' of vertical head (3300gph). I will have to run 1" clear tubing from each pump up to a 1" ball valve. From there I will have to reduce down to a 3/4 Y and split up to two different bulkheads from each pump. (4 in total return bulkheads). Appx 3' of 1" then 3/4" Y and 3/4" rest of way through bulkheads and up to outlets. (Appx 3' of 3/4" plumbing)

So my question is how much will the reduction in plumbing size from 1" down to 3/4" effect my gph. Just wanting to have an idea of how much of a decrease it will have. Not sure there is a exact number.
 

DDK

Plecostomus
MFK Member
May 25, 2013
1,173
24
53
us
Well if my memory serves me right you will experience less head loss with a smaller diameter pipe than a larger diameter pipe. This is due to the difference of pressure. You will have less pressure using the 1inch pvc pipe rather than the 3/4 which in theory should give you more gph. The pump has to work harder to move water through the 1 inch pipe vertically than the 3/4 pipe. Dont know the specifics but I know this to be true.
 

mudbuttjones

Fire Eel
MFK Member
Jul 29, 2014
1,375
58
66
Wisconsin
Shouldn't be a big deal. The ID. Of the 1" ballvalve will be about 3/4" anyway. If anything I'd step up the ballvalve to a 1.25" with some 1.25-1" bushings. You're flow from then on should be OK. Just make sure its a 1" tee reduced down to 3/4 on two ends for the split
 

DB junkie

Gold Tier VIP
MFK Member
Jan 27, 2007
9,036
1,863
2,053
Iowa
Well if my memory serves me right you will experience less head loss with a smaller diameter pipe than a larger diameter pipe. This is due to the difference of pressure. You will have less pressure using the 1inch pvc pipe rather than the 3/4 which in theory should give you more gph. The pump has to work harder to move water through the 1 inch pipe vertically than the 3/4 pipe. Dont know the specifics but I know this to be true.
Apparently I have a lot to learn about pluming cause this makes zero sense to me......
 

ShadowStryder

Bronze Tier VIP
MFK Member
Apr 4, 2007
6,365
970
749
Nunya
DB junkie DB junkie was kinda hoping someone like you and your vast knowledge of plumbing would have an idea.......
 

vamptrev

Silver Tier VIP
MFK Member
Apr 23, 2007
8,227
863
924
Chesterfield MI
In my experience you are gonna loose some flow but prob not too much

Your pumps outputs are only 1" inch? Seems rely small
 

ShadowStryder

Bronze Tier VIP
MFK Member
Apr 4, 2007
6,365
970
749
Nunya
They have quick clip attachment of 1"- 1 1/4" - 1 1/5. I went with 1" so it wasnt a huge difference going from 1.5" down to 3/4 suddenly.

I knew I would lose some flow but wasnt sure how much. Talked to Laguna and they said there would be an issue with tying into the 3/4" and I shouldnt lose to much flow.
 
zoomed.com
hikariusa.com
aqaimports.com
Store