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Old April 9th, 2012, 04:10 PM
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I'm sure there are many variables. How many GPH of concentrate will you get from a 250 GPH Maple RO? This is assuming 2% sap at 40 F single pass or approximiatley 7 to 8 % concentrate.
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Old April 9th, 2012, 04:24 PM
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I think around 75 if I did my math right.
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Old April 9th, 2012, 04:32 PM
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If everything was working perfectly, every time you double your concentrate ie. 2% to 4% you take half of the water. So.... 2 to 4, then 4 to 8 you take half then half again. So... 250 to 125 then 125 to 62.5. That would be your concentrate in an hour.

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Old April 9th, 2012, 04:35 PM
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The answer is 62.5 if you concentrate 2% to 8% with a flow rate of 250 gph. You are removing 75% of the water. Here's the formula.

Raw sap concentration x Total flow rate = Concentrate concentration x Concentrate flow rate

So; 0.02 x 250 = 0.08 x CFR

CFR = (0.02 x 250) / 0.08

CFR = 62.5 gph
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Old April 9th, 2012, 07:53 PM
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I would most likely stay under 1000 taps in the future. I currently have a 3x10 which i plan on tapping 350 to get started. Working full time like most. Is a 250 GPH machine sized right for this operation. The 1000 taps are on my own property, and not sure if I would be interested in leasing for expansion.

Is it possible to go to 8% in one pass, or am I misunderstanding what I read?

Thanks for the info.
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Old April 9th, 2012, 09:02 PM
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Bittersweet, I have a 3x10 and a 250gph RO. This year with 700 taps on vac I wouldn't have slept some nights if it weren't for starting the RO early in the day. If you have a day job and need to sleep, you'll need a 600gph RO to go with 1,000 taps. You can go to 8% in one pass but will plug the membranes faster. If you can start earlier in the day recirculating at low pressure and high flow you'll get there without plugged membranes. When I get a big day and can RO early I set the the conc. and permeate flows about equal around 2gpm each and the pressure at 250psi, then when I start to boil I put the conc to the head tank at about 1.5gpm, or 90 gph which is about what I can evaporate, with membrane pressure at 350 to 400 psi. I'd be glad to help with any questions I can since we're a similar size!
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Old April 9th, 2012, 09:09 PM
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I have a 250 gph ro. It is an older one. It runs about 200gph actual when running. I usually get about 50gph concentrate when taking sugar from 2%-8%. It will not keep up with my evaporator at this rate. I usually start it early and then have to turn concentrate flow up to finish. I run about 1000 taps on this and it works, but I wish I could feed 8% as fast as my evaporator feeds.
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Old April 10th, 2012, 06:09 AM
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Quote:
Originally Posted by mapleack View Post
Bittersweet, I have a 3x10 and a 250gph RO. This year with 700 taps on vac I wouldn't have slept some nights if it weren't for starting the RO early in the day. If you have a day job and need to sleep, you'll need a 600gph RO to go with 1,000 taps. You can go to 8% in one pass but will plug the membranes faster. If you can start earlier in the day recirculating at low pressure and high flow you'll get there without plugged membranes. When I get a big day and can RO early I set the the conc. and permeate flows about equal around 2gpm each and the pressure at 250psi, then when I start to boil I put the conc to the head tank at about 1.5gpm, or 90 gph which is about what I can evaporate, with membrane pressure at 350 to 400 psi. I'd be glad to help with any questions I can since we're a similar size!
I have not seen an operation with an RO. I,m assuming when you start early you have valves that recirc concentrate to your original storage tank. Then when it is time to boil you switch the valves and send it to a head tank of some sort. Is this correct??

You need storage tank, permeate tank (is 500 gallons Enough) and a concentrate tank? Do you need other tanks for different stages of water removal?
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Old April 10th, 2012, 07:01 AM
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Quote:
Originally Posted by Wiam View Post
I have a 250 gph ro. It is an older one. It runs about 200gph actual when running. I usually get about 50gph concentrate when taking sugar from 2%-8%. It will not keep up with my evaporator at this rate. I usually start it early and then have to turn concentrate flow up to finish. I run about 1000 taps on this and it works, but I wish I could feed 8% as fast as my evaporator feeds.
So your PP gets more than 50gph?
I am planning to go to about 600 to 800 taps in the next couple years doing the same
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Old April 10th, 2012, 09:19 AM
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Quote:
Originally Posted by Bitter Sweet Maple Farm View Post
I have not seen an operation with an RO. I,m assuming when you start early you have valves that recirc concentrate to your original storage tank. Then when it is time to boil you switch the valves and send it to a head tank of some sort. Is this correct??

You need storage tank, permeate tank (is 500 gallons Enough) and a concentrate tank? Do you need other tanks for different stages of water removal?
I have a 3 way valve panel that lets me pick between the head tank or back to the sap feed tank. Some people have separate concentrate tanks but I think it's unnecessary, 3 tanks is plenty. 500 gal of permeate storage would be plenty for a 250 RO, (I have a 400gal tank) but too small for a 600 RO. Rule of thumb is permeate storage equal to your RO rating but more is better.
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