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Old September 25th, 2016, 09:49 AM
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Default Feed pump plumbing

I've been testing my home built RO for a week or so now. I've made a couple changes/fixes here and there. The last thing on my list is the suction line for the feed pump.
The way I have it now is

1" raw sap suction hose to feed pump
1" discharge hose to inlet of 10" filter
1" hose from outlet of filter to hp pump inlet

So basically all 1" from suction to hp pump

Should I have a bigger suction line. Or slowly step it down.
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Old September 25th, 2016, 10:38 AM
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Not sure what your flow capacity is. My memtek 250 had all 1" feeds. I added 2 more 4" membranes to it and flowing high 300s had no problems.
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William Warden
3 X 12 Thor pans on homemade arch
1986 Seprotech 900
About 900 of my own and sap from another 1200
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Old September 25th, 2016, 11:09 AM
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My feed pump can do 20 gpm at 60 psi and my hp pump is rated for 10gpm at 200 psi.
My flow across my membranes right now testing with water is about 7gpm concentrate and 1.5 gpm permeate at 200 psi
Haven't noticed pump cavitation or anything yet.
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