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Cleaning & Passivation Procedure Purified water System

  • Fill the Storage Tank upto the Half Level & Start the recirculation pump & circulate water for 25-30 minutes
  • Then drain the water from the Tank & piping ( Via User Points, & Sampling Points.)
  • Prepare cleaning chemical by diluting Sodium Hydroxide ( NaOH) ( of 100% Purity) with water in the ratio of NaOH to  PW Water.
  • Start the recirculation Pump & circulate the cleaning chemical for 45-60 minutes.
  • Flush the equipment and recirculation loops (via user points & sampling points) with water in a ratio of of HNO3 to  PW Water.
  • Start the recirculation pump & circulate the passivation chemical for not less than 1 hrs.
  • Drain the Passivation chemical from the equipments and recirculation loops ( via each user points)
  • Transfer fresh Water to storage Tank.
  • Flush the equipment and recirculation loops with  water till the pH is neutral ( 6 to 7) or to the in feed water quality.
  • Performed by:                                                                Checked/Approved by : …………………..
  • Name:                                                                             Name :
  • Signature:                                                                       Signature:
  • Date:                                                                              Date:

 

 

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