Table of Contents
Why is the pH in my boiler water high?
It comes into play with steam boilers because a pH between 7 and 9 (slightly alkaline) is just right. If the pH is lower than that, the water will start eating the pipes. If it’s higher than that, the water won’t corrode metal, but it may begin to foam, and that’s not good.
What is alkalinity in boiler water?
Alkalinity in steam-generating boilers is a problem because under heat the alkalinity breaks down to carbon dioxide, which passes with the steam. The alkalinity is principally carbonate (CO3) or bicarbonate (HCO3) anions, which can be expressed in parts per million or as grains per gallon. One gpg equals 17.1 ppm.
What happens if boiler pH is too high?
Caustic attack on boilers is a localized attack due to extremely high pH (12.9 +). It can take two forms: caustic gouging or caustic cracking, also called caustic embrittlement. Caustic corrosion (typically in the form of gouging) continues until the deposit is removed or the caustic concentration is reduced to normal.
What does sulfite do in a boiler?
Sulfites. Sodium sulfite is generally used for the chemical removal of dissolved oxygen within the boiler water. To assure the rapid and complete removal of the oxygen entering the boiler feedwater system the concentration of sulfite in the boiler must be maintained at a minimum of 20 PPM (parts per million).
What is condensate pH test?
This test is carried out to prevent acidic corrosion. To test for presence of all of the hydroxide, one half of the carbonate and one third of phosphate present in a water sample.
What is P alkalinity in boiler water?
P-ALKALINITY:- THIS TEST IS CARRIED TO FIND OUT THE PRESENCE OF ALKALINE IN BOILER WATER. BOILER WATER SHOULD BE ALKALINE TO SAVE IT FROM CORROSION. ALKALINITY IS DUE TO HYDROXIDE AND CARBONATES AND HYDROXIDE. P ALKALINITY IS USED TO FIND OUT ALKALINITY DUE TO CARBONATES. “P” STANDS FOR PHENOLPHTHALEIN ALKALINITY.
What should the pH level of boiler water be?
Natural water is usually between 6.5 and 7.5 pH. A common recommendation is to maintain boiler water at 8.5 pH. Caustic attack on boilers is a localized attack due to extremely high pH (12.9 +).
What should the alkalinity be in a gas boiler?
A typically recommended alkalinity rating is 140 – 700 ppm for boilers operating below 300 psi. pH is controlled by either removing water impurities or adding other chemicals to neutralize the condition.
What should I know about boiler water treatment?
1 Recommended Guidelines for Boiler Water Treatment. Use proper water treatment to prevent the buildup of scale on the boiler. 2 pH. The pH value of the boiler water is a number between zero and fourteen. 3 Dissolved Oxygen. 4 Sulfites. 5 Solids. 6 Alkalinity. 7 Phosphates. 8 Hardness. 9 Oils.
What causes calcium phosphate deposits in boiler water?
When calcium phosphate is formed in boiler water of sufficient alkalinity (pH 11.0-12.0), a particle with a relatively nonadherent surface charge is produced. This does not prevent the development of deposit accumulations over time, but the deposits can be controlled reasonably well by blowdown.