1500GPH and two(2) 3/4" returns - enough flow?

  • We are currently upgrading MFK. thanks! -neo
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CrAzYNeSs

Candiru
MFK Member
Sep 17, 2009
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I have a Quiet One 6000 Pump which puts out around 1500GPH. I want to split the flow to two 3/4" returns... Will there be enough water pressure and power from the pump to be able to pull it off?

These returns are going to be about 5 ft away from each other... My worry is that there is too much distance for this pump to push. The pump only needs to push 4 ft up, but there is going to be 10+ ft of plumbing....

I've been thinking about reducing the plumbing down from 3/4" (at the pump) to 1/2" instead.

I need some people with personal experience to help me out.

Here is a flow chart for my pump. Thanks guys!
q1_6000_graph.jpg
 
It will reduce you flow a bit more than at just 4', but it should work. I could not say exactly how much it will reduce it.
 
If anything DO NOT reduce to 1/2 inch if you are looking for enough pressure. By restricting the flow your putting more pressure then you want on the pump and it will burn out. I would just split for the two returns at the same diameter that is coming off the pump then add in valves to control more flow to one side or the other.
 
i agree with Dr Sudz. You are better off plumbing larger diameter lines and using valves to vary the flow. 1/2 line will create too much pressure on the pump and may begin to cavitate. i have worked with large pumps for years and found that the larger the return line the better off you are. I have seen water in pumps reach its boiling point when the water flow is stopped and just runs the water in the pump. (this is an extreme case but it does happen.)

just go larger to prevent any problems, and vary the flow
 
The original piece that it comes with as an attachment reduces a 1" MPT down to 1/2"

Would I be restricting a lot of flow if I used a 1" Female to 3/4" slip?
 
I'm looking for 1" parts (i.e. return fittings like loc-line) but can only find it in 3/4" and 1/2" applications....
 
When you work with plumbing lines of that size (less than 1") flow changes a lot with reduction of cross sectional area. But if you plan on using 3/4" line try to keep 90degree bends to a minimum. You can search online for flow loss due to bends. there are flow charts and tables which have already calculated the equivelant loss through length of pipe for any connection (90 or 45 elbows, couplings, etc...)
 
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