Boiler water quality boiler chemicals are used to ensure proper boiler water quality in boilers.
Boiler water hardness ppm.
Ph 8 3 10 0.
Total hardness 1 ppm maximum.
Free oh alkalinity 200 400 ppm.
Specific conductance 7000 umhos.
The hardness of water is caused by calcium and magnesium ions which will vary greatly throughout the country depending on the source.
Total silica 150 ppm maximum.
Non volatile toc 1 ppm.
For boiler water however a hydrometer can be used to obtain an approximate measurement of the dissolved solids since for boiler water each increase of 0 000 1 relative density at 15 5 c is approximately equal to 110 ppm.
General guidelines to prevent corrosion and scaling in low pressure boilers are as follows.
In addition hardness salts can precipitate from the boiler water to form sludge and eventually scale which deposits on the internal surfaces of the boiler.
Feed water purity requirements therefore can vary widely.
A serious loss of boiler efficiency and possibly boiler failure.
Scale is a buildup of solid material formed on internal boiler surfaces.
A low pressure fire tube boiler can usually tolerate high feed water hardness with proper treatment while virtually all impurities must be removed from water used in some modern high pressure boilers.
It is desirable to keep the concentration of phosphates in the water to 30 50 ppm in order for complete reaction of the phosphates with the calcium hardness entering the boiler through the feedwater.
A boiler that makes up 4000 gal day of water having 100 ppm of hardness has a potential of accumulating over 1000 pounds of scale per year.
Total alkalinity 600 ppm maximum.
Therefore good internal boiler water treatment programs are necessary.
Feedwater hardness usually ranges from 0 01 to 2 0 ppm but even water of this purity does not provide deposit free operation.
Total hardness 0 3 ppm.
Alkalinity test in natural waters alkalinity is most commonly the result of bicarbonate and carbonate ions.
Presented by cleaver brooks steve connor bill hooke.
Total alkalinity 700 ppm.
The below table is the total dissolved solids or tds alkalinity and hardness versus boiler pressure.
Most boiler systems have sodium zeolite softened or demineralized makeup water.
Water treatment recommendations vary depending on the operating pressure of the boiler the application steam or hot water and other parameters.
Only relatively wide ranges can be given as to maximum levels of alkalis salt silica.
