noob overflow question

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karak

Gambusia
MFK Member
Jan 21, 2011
181
2
16
Australia
Thought i better clarify this now before i go wasting PVC.
If i make a 2" DIY overflow as designed in the sticky, and hook that up to a 1" pipe to put to my sump, how much of an effect will this have on flow rate?
Cheers
 
It will bring it down from the 2400 GPH maximum that the 2" pipe has to the 600 GPH maximum for 1" PVC.

Do you mind if I ask why you would need to bring it from 2" pipe down to 1 before bringing it into the sump?
 
Just had 1" hose available so was thinking of possibly using that.
According to my fluid mechanics book, Head loss due to sudden contraction H = K*V^2/2g
K = (1-d^2/D^2). d = small diameter, D = bigger diameter. And K from all the other fittings is ~7.4, so it was only an additional 0.75

So i thought it wouldnt be TOOOO much velocity loss. But its been 3 years since ive done that subject and i am most probably oversimplifying things, probably forgetting how it will the type of flow in the smaller pipe will affect fluid friction and the major losses. Now i am rambling.
Oh well better get some 2" hose, better safe then sorry.
 
Another quick question, could a wye fitting be used instead of a T for the regular overflow design?

I ask because it is a couple of bucks cheaper
 
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