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Re: Need help with Phosphate (Sodium Hydroxine)

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Posted by Vern on February 01, 2002 at 07:53:45:

In Reply to: Need help with Phosphate (Sodium Hydroxine) posted by Brian Rei on January 31, 2002 at 19:10:55:

: I'm a 2nd fireman, I miss understood something I was told. I have a high pH in the boiler. I know why from research that I did it was from a solution called Sodium Hydroxine i think, aka (Formula 7181)

: I added 3mL of this to a tank diluted with water pumping into the boiler to treat low pH. The pH was high at first due to low boiler running. So the chemical built up. I added more to the tank under the impression it would bring the pH down. I was informed by my new engineer that it wasn't correct. I came to the solution fo when there is a large change in boiler water with new feedwater to take the pH and determine if I should run the pump..

: Problem, I learned from this mistake but I'm still missing 1 part of my problem. Is there a chemical, or method of bringing down the pH in the boiler without blowing it down?

What is the pH you are running? What is the pressure you operate at? Do you use softened water
or DI water? pH of 11-12 is normal in a low pressure boiler. If you use di water you will need
to adjust pH with a chemical to get it in the proper range. If you use softened water you probably
have enough natural alkalinity in the water to get pH up in the proper range without addition of
extra chemical. To lower pH in the boiler, blowdown is about the best method. There are some chemicals
such as the bisulfites which can help to keep pH lower, but unless your boiler water is black from so
much caustic or you have severe carryover, I wouldn't worry about it too much.

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