RO-CIP Flow Rate Designing

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Can you advise me about the method of how to estimate the actually required flow rate of CIP flushing for the RO membrane?

if it's 8'' membranes pre pressure vessel having 7 membranes mean how to calculate flow rate?  

if there is any matrix? please explain!

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7 Answers

  2. REFER THE MEMBRANE MANUFACTURERS MANUAL OR THEIR WEB SITE. THE FLOW RATE DIFFERS FOR EACH TYPE OF MEMBRANE. THE CLEANING FLOWRATE AND THE SERVICE FLOW RATE ARE ALMOST SAME. THE FLOWRATE IS FOR EACH PRESSURE VESSEL SINCE, ALL THE MEMBRANES IN THE VESSEL FOLLOW THE SAME FLOW RATE. 

  3. You may refer to RO membrane OEM's website such as Dow, Hydranautics, etc. For 8" pressure vessel, typical flowrate is 6 - 9.1m3/h per vessel. Just calculate the number of vessel of first stage then multiply with flowrate will give you the total flowrate. Flushing duration is subject to the rinsing of CIP chemical until clean.

  5. You can go to www. membranes.com. There is a guidline for cip tank , pump Q and pressure there. It could be useful.

    As I remember for 8" membranes the guidlines are as follows:

    1- Q=115-150LPM for each 8" vessels

    2- P=1.4 to 4 bar 

     

     

  6. Q=vA

    Q is flow rate

    V is speed m/s

    A is cross section area of flow.

    In the case of yours investigation further up .

  7. I am assuming that you are cleaning each stage independently at low pressure.

    I would target flow to maintain a minimum of 40 gpm crossflow.  To put it another way, there should be 40 gpm off of each housing, with no production of permeate.  

    So, if you have 10 housings, It would be 400 gpm at a pressure high-enough to get the flow you need, but low enough not to produce permeate.

    1 Comment

    1. Dear Davd,

      Is it better to consider 2 CIP pumps and wash second stage by just 1 pump and for fist stage by 2 pumps?