Home built R.O.production and delivery

Is anyone one out there who can help me with RO pump/motor configuration for RO production and delivery systen.I intend to use procon and GE motor configuration.For delivery to a 5 bay systen,i intend to use 1/3 hp and for Production 3/4 hp.Any help?

The delivery system is pretty straightforward. You need a controller (like the IDX MX-8) to turn on the pump, a contactor or relay to take the load of the motor and a solenoid for each bay. The signal from each bay goes to a solenoid and one input to the controller.

Some of the older, simpler RO systems I've seen have been the most reliable. There's a solenoid for the water supply and a pump both triggered directly by a heavy-duty float switch. From there it goes in one side of the membrane and out the other - for maximum efficiency and improved water production you can "T" the reject from the membrane with two flow control valves, one going to drain and one back to the inlet of the pump so you can set the product/reject ratio at 1:1.

what will be your advice for a delevery procon /motor configuration?
Do you thing a 1/3 or 1/4 hp motor will do the job for a 5 bay system?

No, you'll need at least a 3/4 HP Procon to get 200 PSI in the bays. Customers won't spend their money using spot-free if they aren't getting at least that pressure. You might barely get away with a 1/2 HP and a direct-couple pump, but it won't hold pressure with more than one bay running. A 3/4 will run at least four bays at once with no significant drop in pressure.

We run a Cat 390 and deliver it at 425 PSI at the bays.

Thanks MEP1 for your advice,actually i have been planning for a 4 bay configuration in Cameroon(Africa).From your advice i will get a 3/4 marathon motor +procon 240GPH,(250psi) for delivery.
For production,i will still use same 3/4 motor to produce 175psi for RO membrane(membrane size 2.5"x40")

You can use a 1/3 HP motor and 1500 series clamp-on pump for production with a 2.5 x 40 membrane and still achieve 200 PSI if you recirculate part of the reject as I described above.

MEP1 ,from what i understand
PRODUCTION
1/3 motor with 1500 series procon
a 2.5x40 memb.

DELIVERY
3/4 motor
240GPH procorn at 150 psi (My delivery soleniods is rated for 10 bar maximum)
My question with the production unit is,will a 500GPD be enough for a 4 bay systen or a 1000GPD?

A 2.5 x 40 membrane will produce about 1000 GPD. I've installed 500 GPD RO systems for people trying to save a few bucks, and IMO they're spending more on electricity to run the pump all day than they could have saved on the equipment. Add to that the fact that a smaller membrane is going to foul faster, and you'll need a bigger tank to use a smaller RO system - in the long run it's cheaper and more efficient to go a little oversize.

150 PSI is too low for spot-free in my opinion.

3/8" or 1/2" connections(feed,drain ,product) Please HELP!!!!!!!

while trying to buy these product

.SS needle valve
.Solenoid valve
.quick connectors
.check valve
i finnally got confused choosing between 3/8" and 1/2" connections.which one will be best to use in the project.Please help....

Assuming you went with a 2.5x40 membrane, 3/8" is sufficient. If you're using tubing to plumb the product system, you should go with 1/2" OD. 3/8" tubing and 1/4" check valves to the bays is big enough for 200 PSI delivery.

What are the needle valves for?

Thanks for you promt responce.Answering your question about needle valve.
Actually the needle valve is intended to be placed between Membrane outlet(product)so as to adjust rejection/Product ration (same time pump psi)

I prefer to use a regulator to control the pressure. You can use it to run all the reject straight to the drain (or recovery tank) or you can run the bypass to the inlet of the pump and use a valve to control the reject flow.

Don't put any sort of control valve on the product line.