Corrosion rate reduction from Corrosion probe 1

[Ponnada]

Hi, We are having a LPR corrosion probe in closed loop Cooling water circuit operating since 9 months approx, Corrosion rate was 0.5mpy for last 2-3 months and current mesured rate is 0.0 with Imbalance 0.5.

Can corrosion rate be reduced in LPR probes or there is any problem with the instrument. Please clarify in detail

 

[brimmer]

You may have already checked, but could it be the elements in the probe are corroded now? LPR probes have a finite life as the elements eventually start to corrode and no longer work, and probes are replaced. Can you pull the probe and check? Ususally the life is longer than 9 months, but depends how corrosive the environment is and what the actual material of the elements on the probe itself is. Probe elements can also be fouled by build up of scales.

 

[Ponnada]

Thank you brimmer, the service is cooling water, Inhibitors are effective and suspect no issues with corosion as we have CP too for these U/G piping.
However, we planned to retract the probe for checking its condition.