Why are chemicals used in steam boilers? Chemicals are used in boilers to reduce energy costs and to prolong equipment life. This is accomplished by preventing scale build up, reducing corrosion rates, and reducing water usage. ASTM publishes recommended boiler water quality standards.
What is the purpose of each steam boiler chemical? Sulfites are used to remove dissolved oxygen to prevent localized corrosion. Alkalinity is used to "boast" the boiler water pH. This decreases the overall corrosion rates. Phosphates and polymer are used to keep the calcium in solution and keep scaling from developing in the boiler. Amines are used to "boast' the condensate, thus reducing the over all steam system corrosion rates. The boiler injection points are different for each chemical.
Which boiler chemical do I use? If you have a boiler over 200 hp, you probably want to stick with a three or four drum program. This is the most cost effective treatment program. A three a four drum treatment program is feeding each of the chemicals is concentrated form. If you have a boiler less then 200 psi, you may choose to use an all in one boiler chemical. This will reduce the amount of chemical drums on site. Supplemental sulfite feeds may also be used to minimize the usage of the All in One boiler water chemical. The all in one boiler chemical for the condensate and without amine.
What testing should I do? On the boiler water you should test the conductivity, sulfite, pH, and hardness. In addition to boiler water testing, proper boiler blowdown and a good boiler preventative maintenance must be performed to ensure a successful boiler treatment program. Please check out our Top 10 overlooked boiler water testing items when setting up a boiler monitoring program.
For more information, please contact us at 800-658-7716 or email our sales consultant at JZajac@ChemWorld.com.