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04/14/2017, 07:26 PM | #1 |
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How far can water travel to your RODI filter?
I'm wondering what kind of head pressure comes from your main line? Can I run 30ft of tubing to my RODI with no issues?
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36X36X30 DT, 75g sump, Vertex Vectra L1 return pump, Apex 2016, Apex DOS +DDR, Apex 1link, 4 X Kessil A360's, Vertex Alpha 170, Maxspect Gyre 250 x2 |
04/14/2017, 08:21 PM | #2 |
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30ft of elevation, or just 30 feet of tube horizontally?
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04/14/2017, 08:42 PM | #3 |
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Running a larger diameter tubing most of the way then the last foot or so going down to 1/4" is the best way to maintain pressure.
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04/14/2017, 08:50 PM | #4 | |
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Quote:
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"Things should be made as simple as possible, but not simpler." (oft attributed to Einstein; most likely paraphrasing by Roger Sessions; compactly articulates the principle of Occam's Razor) Current Tank Info: 325 6' wide Reef |
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04/15/2017, 12:17 PM | #5 |
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Hicksville had 55 PSI -- Miller Place has 78-80 PSI
Only way to tell is with a gauge on the line, or the one on the RO.
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250 gallon mixed reef, 2 Reefbreeder's Photon V 2, Deepwater BLDC 12, DAS EX-3 Skimmer, MTC mini cal, 2-3/4" Sea Swirls, Aquacontroller & 6 Tunze pumps. |
04/15/2017, 12:21 PM | #6 |
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I was never concerned running my line approximately 10ft to my rodi but now I'm running about 30ft with about 5ft vertical. There's not pump involved. I'm just tapping a main water pipe. I was just c
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36X36X30 DT, 75g sump, Vertex Vectra L1 return pump, Apex 2016, Apex DOS +DDR, Apex 1link, 4 X Kessil A360's, Vertex Alpha 170, Maxspect Gyre 250 x2 |
04/15/2017, 12:21 PM | #7 |
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I was just concerned about the longer distance to my rodi
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36X36X30 DT, 75g sump, Vertex Vectra L1 return pump, Apex 2016, Apex DOS +DDR, Apex 1link, 4 X Kessil A360's, Vertex Alpha 170, Maxspect Gyre 250 x2 |
04/15/2017, 12:47 PM | #8 |
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Pressure should stay the same.
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250 gallon mixed reef, 2 Reefbreeder's Photon V 2, Deepwater BLDC 12, DAS EX-3 Skimmer, MTC mini cal, 2-3/4" Sea Swirls, Aquacontroller & 6 Tunze pumps. |
04/15/2017, 01:27 PM | #9 |
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I agree.
Since flow is so low (GPD not GPH or GPM) there should be a very small/no pressure drop. Don't you have a pressure gage on the RO/DI unit? Nothing like empirical evidence.
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John DT 120G. mixed reef w/ lots of automation + assorted FW and SW tanks. |
04/16/2017, 05:58 PM | #10 |
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I called to ask BRS about this very question.
Their answer was no. The extra length of tubing won't affect performance from what they said. The same holds true for the waste water plumbing. In my case I need to run it about 40'. They said, "No problem!". I asked if it would be worthwhile to go up to 3/8" tubing on either the supply or waste lines given the long run. They didn't seem to think the larger tubing would affect performance much. Either way, I'm plumbing mine with 3/8". I like overkill. |
04/16/2017, 09:59 PM | #11 |
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FWIW, I ran my RODI system off long feed and discharge 1/4" tubing for many years. Never seemed to affect performance at all.
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Simon Got back into the hobby ..... planned to keep it simple ..... yeah, right ..... clearly I need a new plan! Pet peeve: anemones host clowns; clowns do not host anemones! Current Tank Info: 450 Reef; 120 refugium; 60 Frag Tank, 30 Introduction tank; multiple QTs |
04/17/2017, 06:16 AM | #12 | |
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Quote:
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04/17/2017, 07:45 AM | #13 |
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Awesome. Thanks, everyone. My concerns have been addressed.
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36X36X30 DT, 75g sump, Vertex Vectra L1 return pump, Apex 2016, Apex DOS +DDR, Apex 1link, 4 X Kessil A360's, Vertex Alpha 170, Maxspect Gyre 250 x2 |
04/17/2017, 09:16 AM | #14 | |
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Quote:
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Simon Got back into the hobby ..... planned to keep it simple ..... yeah, right ..... clearly I need a new plan! Pet peeve: anemones host clowns; clowns do not host anemones! Current Tank Info: 450 Reef; 120 refugium; 60 Frag Tank, 30 Introduction tank; multiple QTs |
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04/17/2017, 10:25 AM | #15 |
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If you go with 3/8" all the way you can/will see less of a pressure loss vs 1/4" all the way.
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04/17/2017, 12:57 PM | #16 |
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A bit late, but I have an identical situation, running 35 ft of 1/4 inch line to my RODI and it did not affect the performance in the slightest. Go as long as you need!
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04/18/2017, 09:47 AM | #17 | |
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Quote:
This is why you have to solve plumbing problems iteratively. See what the velocity is, then check the losses, calculate a new velocity, repeat until it converges. |
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04/18/2017, 12:41 PM | #18 | |
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Quote:
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04/18/2017, 03:15 PM | #19 |
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That's probably true.
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04/18/2017, 06:01 PM | #20 |
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Tiny difference. A long run of narrow tubing adds drag to the water, which creates a pressure gradient. The further down the tube the lower the pressure.
However, the speed of the water impacts the magnitude of the drag and the speed of the water is very low for an RO system. If it ran fine on 10' it'll run fine with an extra 20' and 5' of head. You won't even notice the tiny difference unless you have a pretty big RO unit. |
04/20/2017, 07:53 AM | #21 |
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I was interested to see how much pressure loss there was over the 30 foot line I have while the RODI was running. I hooked up calibrated precision pressure gages at both sides of the 30 feet of ro tubing and took measurments as the RODI was running (100GPD for reference). There was a 1.5 psi drop over the 30 feet of tubing at normal RODI flow rates. With this in mind, you can reasonably assume that for every 20 feet of 1/4" hose you use, you will lose 1 psi of pressure, Plus any head losses due to increases in elevation between the hose inlet and outlet.
This is a simple test anyone with 2 gages can perform, or if you only have 1, you can just plumb it in at the RODI inlet and see what the supply pressure is while it's running. |
04/21/2017, 05:01 PM | #22 |
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I read somewhere that your ro/di HAS to be hooked up no farther than 1 mile from the nearest water tower. Any farther than that and you have to dig a well.
j/k ^^^What they've all said^^^
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I'll try to be nice if you try to be smarter! I can't help that I grow older, but you can't make me grow up! Current Tank Info: 120 mixed reef with 40b sump, RO 150 skimmer, AI Sol Blue x 2, and a 60g Frag Tank with 100g rubbermaid sump. 2 x Kessil A360w lights, BM curve 5 skimmer |
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