ADJUNCT Hardness Controller
Product code RXSOL-25-5006-025
Boiler Water treatment chemicals Used as a SCALE CONTROLLER to prevent the formation of calcium scale and other mineral deposits in low-, medium-, and high-pressure boilers.
Description
Hardness Control is a white dry powder Phosphate Boiler Water Treatment product used for the reduction of hardness in boilers. Hardness Control is highly soluble in water and It will precipitate calcium hardness as a non-adherent sludge. Disodium phosphate pure neutral grade used in BOILER with other Boiler Water treatment chemicals concentrated alkaline liquid to prevent calcium scale deposits.
Application
Hardness Control is formulated to form a precipitate with calcium ions which will not adhere to metal surfaces but are in a form suitable for blowdown. Disodium phosphate as a scale controller used in lowpressure boiler systems (0-32 bar) and medium-pressure steam propulsion vessels (32-60 bar) also in boiler water treatment program for highpressure steam generating systems (60-84 bar).
Used for boilers and water softening.
Formation of Calcium Sulfate is main cause for SCALE formation :::
The principal problem potential posed by sulfate ions in water is the possibility of calcium sulfate scale formation. Precipitation of calcium sulfate can occur when high concentrations of both calcium and sulfate exist simultaneously. There are three primary areas of water treatment in which calcium sulfate precipitation may occur boilers, cooling systems, and ion exchangers operating in the hydrogen or acid mode.
In boilers, calcium sulfate scale formation has been reduced to a minimum by modern treatment practices. The low hardness levels largely preclude calcium sulfate boiler scale. By contrast, cooling systems are subject to calcium sulfate scale deposition because the makeup is usually not treated for hardness removal. Cooling water is usually treated with sulfuric acid for pH control, and the makeup is cycled, i.e. concentrated. Calcium sulfate scale deposition can result unless the cycles of concentration are properly controlled in conjunction with the proper use of scale control chemicals. Cation ion exchangers regenerated with sulfuric acid also can pose a major calcium sulfate problem. Calcium sulfate precipitation can be avoided by controlling the acid concentration and the flow rate through the exchanger.
Sulfate content can be calculated in Laboratory by using this method ::: http://rxmarine.com/SULFATE-TEST-KIT
Precautions
Phosphate/pH relationship recommended to control boiler corrosion. Different forms of phosphate consume or add caustic as the phosphate shifts to the proper form. For example, addition of monosodium phosphate consumes caustic as it reacts with caustic to form disodium phosphate in the boiler water according to the following reaction:
NaH2PO4 + NaOH ® Na2HPO4 + H2O monosodium phosphate sodium hydroxide disodium phosphate water
Conversely, addition of trisodium phosphate adds caustic, increasing boiler water pH: