May I ask how to translate the total hardness of boiler water: “less than 2 ppm as CaCO3”?
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Does it mean “less than 2 ppm on a CaCO3 basis”?
I think the CaCO3 content is less than 2 ppm.
It should be based on CaCO3, with water hardness of less than 2PPM. You are likely correct; water hardness is divided into carbonate hardness and non-carbonate hardness. Carbonate hardness: It is primarily the hardness resulting from bicarbonates of calcium and magnesium, with a small amount of carbonate hardness as well. Bicarbonate hardness decomposes into precipitates upon heating and is removed from water, which is why it is also known as temporary hardness. Non-carbonate hardness: It is the hardness resulting primarily from salts such as sulfates, chlorides, and nitrates of calcium and magnesium. This type of hardness cannot be removed by heating and decomposition; hence it is also known as permanent hardness, such as CaSO4, MgSO4, CaCl2, MgCl2, Ca(NO3)2, Mg(NO3)2, etc.
Boiler water hardness: The content of salts present in boiler water in the form of calcium carbonate should not exceed 2 ppm
Reply to 3# li_byn: The explanation is very detailed, but it’s too hasty to conclude that it’s water hardness based on just one sentence without any context. Personally, I think a direct translation of calcium carbonate content/concentration would suffice
This post was last edited by jackwen on 2011-1-4 at 19:04. Translation: On a CaCO3 basis, less than 2 ppm. Boiler hardness refers to the total concentration of Ca2+ and Mg2+ ions, usually expressed in terms of CaCO3 or CaO
Personally, I think that after conversion to Ca2CO4, the concentration is less than 2 ppm
Based on calcium carbonate, the hardness shall not exceed 2PPM