Table of Contents
What should the pH of boiler water be?
pH 11
Boiler water should be maintained at pH 11. Generally, the higher the pH (basic), the less soluble some solids are in the water. The lower the pH (acidic), the more soluble these solids are.
What can be added to water to maintain a pH?
You need a buffer to increase the pH by adding water softeners with alkaline-rich compounds (like limestone). This treatment method is used if water is acidic (low pH). Soda ash (sodium carbonate) and sodium hydroxide raise the pH of water to near neutral when injected into a water system.
What does it mean when your boiler says pH?
pH Related Corrosion A low boilerwater pH is usually caused by contamination of the boiler feedwater, from sources such as hydrochloric or sulfuric acid from leaks in demineralizers and condenser leaks of cooling tower water.
Why is pH value so important in controlling the boiler feed water?
The need for boiler feedwater treatment is therefore required to prevent scale forming on the heat transfer surfaces and to prevent water side corrosion. Correctly maintaining the pH of the feed, boiler and condensate system is an essential parameter for corrosion control.
Why is pH of boiler alkaline?
Alkaline pH causes an oxide film to form on the boiler tube surfaces that protects the base metal from further corrosion and allows breaks in the film to heal efficiently.
Is boiler condensate acidic?
Condensate from condensing boilers is acidic and corrosive to many materials and should be treated to maintain a pH of no less than 5 before disposal.
How do you neutralize acidic condensate?
Condensate Neutralizers treat this water by forcing the acidic runoff through a neutralizing tube and high-quality media such as calcium carbonate that will raise the PH level of the runoff, leaving it relatively acid-free.
What causes boiler condensation?
A flue that is too large allows too much air to circulate, making it difficult for the warm gas and vapors exiting the furnace to create a strong updraft up and out of the vent. As the vapor sits in the flue it cools, creating condensation.
What is pH and why is it important in a boiler?
Correctly maintaining the pH of the feed, boiler and condensate system is an essential parameter for corrosion control. The boiler’s operational pH depends on the boiler pressure, system metals, feed water quality and type of chemical treatment in use and is generally dictated by the water’s p-Alkalinity.
How do you neutralize pH in a gas boiler?
pH is controlled by either removing water impurities or adding other chemicals to neutralize the condition. For example, Caustic Soda, an alkaline, is added to neutralize CO3, carbonic acid. When the boiler water pH drops below about 8.5, a corrosion called acid attack can occur.
What should the alkalinity of water be in a boiler?
A typically recommended alkalinity rating is 140 – 700 ppm for boilers operating below 300 psi. Natural water is usually between 6.5 and 7.5 pH. A common recommendation is to maintain boiler water at 8.5 pH.Acidic water is corrosive.
What should be the pH of boboiler feed water?
Boiler feed water or make up water PH should be maintained ideally between 8.5 & 9.5 (in alkaline range).