Skip to content
-
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:
