The presentation describes the water chemistry for the boiler water used in large PF boilers in Thermal Power Stations.

1. BOILER WATER CHEMISTRY
PRESENTATION
BY
Manohar Tatwawadi
(KTPS, KORADI)
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7. SWAS is nothing but
insurance for turbine
Here is a presentation
that will help you
taking a more
appropriate decision
when you look for
good steam & water
quality analysis
Steam and
Water
Analysis
System
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8. Typical Sampling points
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26. Sr
N
Name of
the Sample
Parameters Recomnd.
IS Recomnd.
IS 10496/1983
Actual under
normal operating
conditions
1
DM / Make
up Water
pH - - 6.0 to 7.0
Condy.  0.50 mhos/cm -  0.5 mhos/cm
SiO2  0.02 - Nil
2
Stator
Water
pH 6.5-7.5 - 6.0 to 6.8
Condy.  5mhos/cm -  1.0 mhos/cm
Copper  0. 20ppm -  0.15 ppm
3
Condensate
Water
pH - 8.5 – 9.0 8.65 to 8.80
Condy. - - 2.50 to 4.0
After C.C.(0.4-0.5)
SiO2 -  0.02  0.01
Free NH3 -  0.50 ppm 0.2 - 0.35 ppm
TH - Nil Nil
Na+ ( Online) -  20ppb  5 ppb
SPECIFICATIONS (Recommended and Actual)
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27. 4
Boiler Feed
Water
pH 8.8 to 9.20 8.5 – 9.5 8.8 to 8.95
Condy. 0.3 mhos/cm
After C.C. ( OL)
0.3 After C.C. 3 to 5mhos/cm
After C.C.( 0.4 –
0.5)SiO2  0.02 ppm -  0.01 ppm
Res. N2H4 0.01 to 0.02 ppm up to 0.05 ppm 0.015 – 0.03 ppm
Free NH3  0.50 ppm - 0.2 – 0.4 ppm
Hardness Nil - Nil
Copper 0.005 ppm -
Iron 0.01 ppm  0.01 ppm
5
Super
Heated &
Saturated
Steam
sample
pH - - 8.8 to 9.0
Condy. - - 2.5 to 4.5 s/cm
SiO2
– - -  0.02 ppm
6
Boiler Drum
water
sample
pH 9.1 to 9.8 - 9.3 to 9.6
Condy.
Max.100
mhos/cm - 15 to 35
SiO2
As per Silica chart
 0.55 ppm at
press.140 kg/cm2
-  0.30 ppm
Res. PO4 5 to 10 ppm 2 – 10 ppm 1 to 4 ppm
Cl – - 2 ppm  1 ppm
* Sampling flow rate should be not less than 450 ml / min.
0.01 ppm
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28. METHODS OF TEST
Method of preparation of
standard solutions for
colorimetric and volumetric
analysis
IS 2316: 1990
Standard Solutions are
prepared as per IS
Determination of Copper Zinc dibenzyl dithio
carbamate 454 nm
IS 10496
Neocuproine
method 454 nm
Determination of Iron Bathophenanthroline
method 533 nm
IS 10496
Determination of Ammonia Nesslers reagent method 430
nm
Determination of Hydrazine Paradiamethylamino
benzaldehyde 460 nm
Determination of artho
phosphate
Ammonium
vanadomolybdate method
400 nm
Silica Molybdate method with
ascorbic acid as reducing
agent 640nm
IS 10496 Molybdate
method with ANSA
as reducing agent
640 nm
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