Trisodium phosphate will take the pH in the feed line to (without looking it up) about a 12.  This is at the point where you would get both Ca and Mg reaction with PO4 and precipitate.  1  on a high pressure boiler you should be using a good softener, with no hardness at all going to the feed line or to the boiler. 2  What in the world caused someone to put in a TSP program on a high pressure boiler.  Phosphate cycles for this type of operation went away in the 60s. and earlier.   3  If you need to get the alkalinity up, for some reason, you should be using NaOH or KOH in your treatment program.  Not soda ash or TSP.   4  If you want PO4, there area a lot of other phosphate salts that will not raise the alkalinity and precipitate most things right out of solution.  Remember the first course in analiytical chemistry - qualitative analysis.   5  The cheapest PO4 to purchase is phosphoric acid and neutralize it yourself with KOH or NaOH.  In most cases with boiler treatment the KOH is the way to go because we are usually adding a lot of sodium already to the water treatment as sodium acylates and sodium phosphonates. 6  Why are you not using a phosphonate such as HEDP and/or AMP instead of PO4 which can precipitate and form a Calcium PO4 Sludge.  7 Perform a complete water analysis for both the incoming water and the   actual feed water which is diluted by the returning steam condensate.  Also perform a full analysis on the steam condensate. Perform a full analysis on the soft water makeup.  Now then the Feedwater to the boiler is a combination of incoming water, steam condensate and feed water - look for problems and know what is happening for all water sources. 8 Good luck You can send be a direct text if you still have problems.  wh@bluevalleylabs.com   Waymon

Published June 28, 2021 00:20 by Waymon Hofheins