RO Pump

It depends upon a lot of things. If not well versed in these matters, then contact a specialist and let this individual do it instead.

That would depend on the requirement.

I had designed an RO for sanitary usage and to get the pressures I staged the pumps in series.

need more info, pressure required, membranes and such.

One thing I have learned and alot of mechanical engineers don't realize, is when designing process equipment the keystone to the process is control.

phoenix911

I used on a boat for making household drinking water from the sea water. It didn't make much, but it was enough to keep us on the grounds and not running to town for water. The pump and motor was a just a Hotsy pressure pump.

www.hotsy.com/

those portable ones for camping and boating are cool.

The RO I designed was an industrial, that could produce 50 GPM permeate.

Which can be added to the question to the OP. what and how much do they want to process and how are the going to use it.

permeate is what flows through the membrane, but they could also be using the retentant by concentrating a product.

It has been about 7 years since I did any kind of process for fracturization. I know that the membranes itself has been improving even while I was doing it with the required pressure dropping because of the design of the membranes improving.

Phoenix911--We got hand pump ones for our inflatable life rafts about 10 years ago-- must be similar. Do you have any hard to find links or info to affordable ones for households--I don't have trustworthy well water.

you just want to hook up for drinking,

alot of supply stores sell them such as home depot and menards.

When I saw how these were put together it was just plastic fittings and the canisters for the membranes.

I'll see if I have any info.

I'll get back to you.

RO water is too pure for drinking all the time. The mineral content is so low it leaches minerals out of your body.

Mr. Gee

This is a true fact. You realy should pass the RO water through a simple and cheep process that will replace the minerals. Specific trade names very, most are simply canister type units for relitivly small units less than 20 gpm.

ALSO bear in mind than your piping will also suffer due to the same problem if untreated.

Untreated RO water will attack everything but Stainless Steel and PVC. The fluid ends of Cat Pumps are in fact Stainles Steel by the way.

You could check out Sea Recovery Inc. on the web, they have some good designs that run trouble free with a good maintenance program in place. Especialy the North Sea unit.

I'd be interested too.

Check out CAT Pumps on the e-net. I have ran many makes and sizes of RO's and I can tell you for sure that the CAT pumps are superior as far as performance and maintenance. Also use a cog belt.

Don't be fooled by alike looking pumps that are made of cheep materials. This advice comes from experiance!

Dear MacNealty, Pump pressures are typically in the 200psig to 400psig range but this depends on the type of membrane and the temperature of the supply water, typically colder water will require higher pressures to maintain the same flowrate. CA (Cellulose Acetate) RO units may need upto 550psig whereas thin-film composite RO units typically require 200psig-250psig.

Before selecting the pump you really need to have some water analysis done as this will determine the type of membrane and possible pre-treatment steps (for example activated carbon beds for the reomval of clorine present in the water supply). The pH level of the water is important and certain types of membrane operate better at different pH levels.

You probably have this done already so you don't need me pointing it out again so sorry if I am repeating something that you have already done.

Hope some of this information is of help

Knd Regards

Mr. W.A Snow

You'll need to run the RO projection for your membrane model and required permeate output. From the projection, you will get the minimum required flow and pressure for the high pressure pump. Use this projected flow and pressure to size the pump, preferably 1 size larger to compensate for scaling as time goes by.

Dear DVader1000,

Thanks for answering.

I use Toray and Hydranutics software for projection .Do you mean if I get a result for the pressure say 22 Bar,then for practical reasons I could go up to 25Bar or higher for instance, as long as the pressure still within the membrane design limits?

Also, if I am going for 25 Bar pressure , does that mean I select a pump delivering the quantity I want against pressure head 250 meters?

Best regards