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Old 12/03/2018, 10:22 PM   #1
machonachos
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RODI Plumbing suggestion

So I'm in the process of installing a RO/DI unit at work for our office tank. I'm not the most proficient in plumbing so I thought I seek some help from the community. We currently have a water dispenser already tapped in under the sink, so I would be teeing off the existing 1/4" polyethylene tubing. I dug out a few tees and valves. I was wondering what would be the best way to tee off the line. Do I need any check valves?

Option 1 - connect a tee, then a ball valve after that

Option 2 - use this 3 way valve I had.

Any advantages, disadvantages or does it not matter at all? Just trying to make sure I'm doing this right.

Pics attached.


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File Type: jpg tee.jpg (25.3 KB, 13 views)
File Type: jpg 3way.jpg (23.1 KB, 14 views)
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Old 12/04/2018, 05:42 AM   #2
mcgyvr
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Assuming you have an auto shutoff valve on the RO/DI system then all you need is the Tee..
I would use the tee and ball valve so you can turn the supply to the RO/DI on/off when you want to use it

I wouldn't use option 2


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Old 12/04/2018, 09:25 AM   #3
hipertec
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I was also told by brs to put a check valve after the tee and before your RODI valve. Not sure it's neccebut that's what they said.


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Old 12/04/2018, 11:07 AM   #4
mcgyvr
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Quote:
Originally Posted by hipertec View Post
I was also told by brs to put a check valve after the tee and before your RODI valve. Not sure it's neccebut that's what they said.
Typically thats recommended if you are adding a tee post RO membrane to feed a drinking water system and the other side is going to the DI membrane for full RO/DI output..
The check valve is used because of the pressurized storage tank typically used with those drinking water systems so that the pressurized water doesn't just flow right out into the DI stage when the drinking faucet is not open..

I don't see a reason for a check valve in this application unless said water dispenser has a pressurized storage tank.
I am assuming the "water source" here isn't another RO filtration system with a secondary DI stage.


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Old 12/04/2018, 01:41 PM   #5
machonachos
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Hey guys thanks for your input. The "water dispenser" has its own RO filter system (pics attached). There is a pressurized water container that feeds the ice machine inside the fridge.

The "water source" is basically water from under the sink, that the water dispenser installer tapped into the sink pipe with the saddle valve type (the ones where it punches a hole in your existing cold water pipe).

Originally I was planning to just use the ball valve to turn on the RODI system, fill up my buckets, set a timer on my phone, and pray it doesn't overflow my buckets. Therefore, no auto shut off valve. mcgyvr, I believe I will just add an auto shutoff float to a 5 gallon bucket because Murphy's Law will overfill and flood the kitchen.

Would going Option 2, be beneficial here since theoretically it would be more PSI going into the RODI unit? I believe I can direct all water towards the RODI unit (no water to the RO water dispenser), since the pressurized water container can satisfy any employees water needs while the RODI is running. Or would shutting off the water source to the RO water dispenser cause priming issues and the like?

I've attached additional pictures of the RO water dispenser and rough hand sketches of the plumbing (excuse my artistic skills). Please let me know if any check valve are needed and your advice is greatly appreciated!


Attached Images
File Type: jpg currentplumbing.jpg (23.2 KB, 5 views)
File Type: jpg rodiadditionplumbing.jpg (26.4 KB, 4 views)
File Type: jpg waterdispenser.jpg (61.3 KB, 4 views)
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