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Jim Watts on High Sulfite Residual

By: Jim Watts [764] 5 Stars
Date: Sunday, January 07, 2018
Time: 2:21:07 AM

The most likely cause for having too much Sulfite is that you are pumping too much in.
However the numbers you present are inconsistent and difficult to diagnose confidently.
Your High pressure has the lowest reported chemicals but the highest TDS. This is probably because you are not neutralising the sample to remove OH alkalinity before measuring conductivity. as OH has 3 times the conductivity of other components the actual TDS may be lower than reported. You do not indicate the actual PH and each boiler could be at opposite ends of the range reported.
You sulfite units appear to be the result of different procedure as one is reported as SO320 and one as SO380 and who knows what mysteries that represents.
It is not clear if there is one DEA or two involved but it is hard to see two different tests required if only one is used.
Sulfite decomposition would be different at the different pressures and my be contributing to some of the issue.
It would make sense to me to reduce sulphite until you got nearer to the minimum on the HP boiler if they are in fact common feed and obvious if they are not.
Running high levels is a waste of money at minimum and tending to problems you dont need.
It is also normal to run the TDS in the high pressure boiler lower than the WHRB.


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