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Purpose of Boiler water test ?

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  • Purpose of Boiler water test ?

    Purpose of Boiler water test ?

  • #2
    1) Alkalinity test: This is to ensure that the boiler water prevent corrosion by neutralization of acidic gases

    (a) Phenolphthalein ( p ) alkalinity:
    • 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.

    (b) Total ( T ) alkalinity test: To determine the amount all of hydroxide, all of the carbonate, and two thirds of the phosphates

    Note: Hydroxides and carbonates can co-exist together in a solution but hydroxides and bi-carbonates cannot.

    2) Chloride test

    - To know the amount of salt in boiler water.
    - To minimize chloride level and to adjust the blow down.

    3) Condensate PH test

    - To control condensate PH value within a limit.
    - To minimize corrosion in steam and condensate system.

    4) Amerzine test ( Hydrazine test )

    - To test for dissolved Oxygen content
    - To know reserve hydrazine (N2H4) ppm and to prevent corrosion and aeration.
    - To minimize oxygen pitting and corrosion in boiler, steam and condensate system.

    5) Phosphate test

    - To control the scale formation due to hardness (presence of Phosphate in sample means no hardness salts)
    - A reserve of phosphate should be maintained in the boiler water ready to neutralize any hardness salts which may enter.

    6) Conductivity test
    • Measure of the total amount of dissolved solids (T.D.S) including the treatment chemicals. (Excessive density leads to priming and or deposits)
    • To remove dissolved and suspended solid by blowing down. Hardness test

    7) Hardness
    • To check for salt causing “hardness”
    • Hardness test of boiler water are not necessary when the phosphate is above the lower limit of the control range


    • #3
      Deepak, has perfectly mentioned it: you can test the Boiler water with below procedures:
      • Alkalinity test [Phenolphthalein ( p) alkalinity test, Total ( T ) alkalinity test (2 x P)]
      • Chloride test.
      • Condensate PH test.
      • Amerzine test ( Hydrazine test )
      • Excess phosphate test.
      • Conductivity test (Total dissolve solids test)
      • Hardness test.


      • #4
        Industrial Boiler water testing is important to understand the scaling or corrosion potential of the water, to see whether sufficient chemical inhibitor is present and whether there is risk of carryover which can contaminate product if you use live steam or cause corrosion of steam and condensate lines with wet steam.