What is the right booster pump for my RO system?

[Fredj A Jad]

i buy a used RO system has 2 membranes (4080), carbon and sand filters, complete RO system except the booster pump is missing and I'm confused which booster pump will work for my RO system?

here's the details on the high pressure pump stamp

Type : CRN4-220 A-P-G-AUUE
Model : D4 1630022P1 9527
Q=6 m³/h
H=140.2 m
n=2900 min
p/t = 21/ 120 25 / 40 bar/C max



any help would be appreciated

 

[Artisi]

What do you mean by booster pump?
Is there a pump with the unit now?
type CRN is a Grundfos pump.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

 

[ashtree]

What i think he means is a feed pump. There is a fair chance that the CRN4 is used to provide system pressure and recirculation of the concentrate back to the feed side of the pump.
However there would be a need for a pump to feed through the carbon and sand filters seperate to the CRN4.

With 2 4080 membranes i would think your feedrate would be somewhere around 0.5m3/hr so a pump such as a CH2-30 if you wanted to stay with Grundfos would be adequate.

Regards
Ashtree
"Any water can be made potable if you filter it through enough money"

 

[LittleInch]

Depends on your process requirement.

I interpret the pump information to be a pump which has a duty point of 140m @ 6m3/hr.

The outlet of the pump can be between 21 to 120 bar at a temperature between 25 to 40 C [but this might be the other way around?? ) - the use of p/t line is confusing and not normal

so assuming I'm right, the booster pump or feed pump needs to output anywhere from 7 bar to 106 bar ( the pump only adds 14 bar)

From what I can see you don't need much more than 15 to 18 bar max for this type of membrane so it is a fairly small unit you need.

But you need to know what the system has to do in total otherwise it might be too big or too small.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[dbill74]

You need more information about your system.
What is the required flow through the membranes? This minus high pressure pump flow gives booster pump flow requirement.
What is the required pressue input of the membranes? Verify that high pressure pump is providing the requisite pressure.
What are performance characteristics of the energy recovery/pressure exchanger or turbine if that is what is used?
- This will give you the pressure on the inlet side of the booster pump.
From there it is a matter of finding and selecting a pump that meets the parameters.

Also, ask the previous owner what booster pump they used, will get you pointed in the right direction.

Whatever you get, get a pump with stainless steel impellers. I have a project that is having issues with breaking plastic impellers in the booster pump.

 

[bimr]

Goulds, Tonkaflo, or Grundfos pumps will work in that application. The typical pump is a mult-stage type constructed of stainless materials.

https://www.gewater.com/products/tonkaflo-centrifugal-pumps-and-housings