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Hardness Phosphate Control

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.

Remarks

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:

Na3PO4 + H2O ® Na2HPO4 + NaOH trisodium phosphate   water   disodium phosphate   sodium hydroxide
 
Note

Benefit and Features

  • Highly active phosphate based compound, economical in use.
  • Easily dissolved in water for dosing.
  • Scale problems due to calcium are eliminated.
  • Maintains sludge in a non-adherent state for ease of blow down.
  • Simple test to determine level of treatment.
  • Can be used for boilers of all pressures.
    Rxsol Hardness Control does not influence the alkalinity in the system

RXSOL brand is well known name for Hardness Phosphate control manufacturer, Exporter and supplier in Mumbai, Chennai, Kolkata, Vizag, Goa, Kochin, Manglore, Kandla, Gandhidham, Fujairah, Dubai, Sharjah, Uae, Gulf Middle East

Sampling And Testing

A sample of boiler water should be drawn for analysis daily. The sample should always be taken from the same point after blow down, cooled and tested immediately. Follow the Rxsol Hardness Test Kit instructions and fill the Boiler Water Log Form according to result results. It is important that regular testing is carried out to ensure levels of treatment are correct.

Physical Properties :

Appearance        :White powder
Corrosive action  :NonE
pH 1% solution   :8.8
Flash point         :None

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.

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

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A precipitant designed to eliminate scale deposits and lower the hardness of water in boilers with working pressure up to 60 bars.

It is used in conjunction with alkaline liquid to prevent calcium scale deposits. Both products are used in our standard boiler water treatment programs for low-pressure boiler systems (0-32 bar) and medium-pressure steam propulsion vessels (32-60 bar).

Hardness Phosphate Control Role of phosphate in boiler water Trisodium phosphate in boiler water Trisodium phosphate dosing boiler drum boiler water hardness limit Boiler scale formation Effect of phosphate in boiler water Boiler phosphate control

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:

Na3PO4 + H2O ® Na2HPO4 + NaOH trisodium phosphate   water   disodium phosphate   sodium hydroxide
 

For optimum results dose Hardness Control direct to the boiler via the bypass pot-feeder. The dry powder should be dissolved in hot water (50°C) at a ratio of 1 part powder to twenty parts condensate (e.g. 500 grams/10 litres). Ensure that treatment is fully dissolved before dosing.


This  treatment dosed at 1.49 grams per ton of distilled water provides 1.0 ppm phosphate.

Feed Points: Dose with other BOILER CHEMICAL/alkaline liquid by diluting withcondensate and feed directly into the system drum (below the water level) using a bypass pot feeder. For low-pressure boilers, It may be dosed to the hotwell or condensate return tank, although this is not the preferred method.

 

Dosage and control

 

Phophate test result in pPM PO4

 

 Pressure

 0 - 10

10 - 20

20 - 30

30 - 40

40 - 50

> 50

 Control range

 0-40 Bar
0-588 PSI

 23

11.5 

Satisfactory

Satisfactory

Blow Down

 20-50

41-60 Bar
589-880 PSI 

 17

 5.5

Satisfactory

Blow Down

Blow Down

  15-30

 > 60 Bar
> 880 PSI

 5.5

 Satisfactory

Satisfactory

Blow Down

Blow Down

 10-25

Select row on righthand side for applicable pressure range. Compare test result with comment in table and dose stated amount of product per ton boiler water volume.

These are recommended values based on experience and are in no way intended to replace the boiler manufacturer's specifications or company regulations.


 

Application of RXSOL's boiler water internal treatment chemicals is a significant contributor in the fight to control deposit forming contaminants, maintain clean heat transfer surfaces, ensure optimum efficiency, and prevent downtime. In addition, the benefits of internal boiler water treatment include: Reduces deposition and potentially removes pre-existing scale Reduces the probability of deposit-associated corrosion Improves contaminant transport and reduces boiler sludge accumulation Promotes clean heat transfer surfaces and enhances boiler efficiency Control total cost of ownership by optimizing fuel and water consumption Improves reliability and availability by minimizing tube failure and downtime

Deposition and corrosion of boiler systems reduce efficiency, increase fuel and water consumption, and may lead to failures, which are a safety hazard, add maintenance costs and may impede production. RXSOL's  boiler water internal treatment programs provide highly effective protection against corrosion and scale formation to ensure optimum performance and availability of your steam system while reducing the total cost of ownership and environmental footprint through energy and water savings.

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