2. Boiler water sampling
Presented by-
Suman Sarkar (Jr. Chemist)

3. Training Outline
 Objective
 Sample Category
 Sample Collection
 Types of quality parameter
 Quality measurement

4. Objective
 Predict about corrosion and corrosion rate in boiler
 To check and control the quality parameters of
water
 Take required step(s) to prevent corrosion

5. Boiler water: Sample categories
 HP Steam
 LP Steam
 HP Drum
 LP Drum
 HP Economizer/Feed
 LP Economizer/Feed
 CEP
 CCCW
N.B. HRSG 1 & 2 both have individual sample categories except CEP & CCCW

6. Boiler water: Sample collection
 Before sample collection, open the sample
discharging tab fully at least 5 min

7. Boiler water: Sample collection cont’d
 Clean the collection bottle with the sample properly
and collect about 500 ml sample

8. Boiler water: Quality parameters
 pH
 Conductivity
 Silica
 Phosphate
 Iron
 Sodium
 Dissolve Oxygen (DO)
 Nitrite
 Turbidity

9. Quality measurement: pH & conductivity
 Wash the plastic beaker with the sample properly
 Take 100 ml sample in it
 Rinse the pH & conductivity sensor by sample
 Immerse the sensor in sample
 Start the meters and then press the
measurement button

10. Quality measurement: pH & conductivity
cont’d
 Take the values when the reading is stable

11. Quality measurement: pH & conductivity
cont’d
Cautions:
 Use the sensor carefully aloof from all
possibilities of damaging chances.
 Place the meter in suitable position so that it
cannot fall down
 Cover the sensor with the provided cap after
using

12. Quality measurement: Silica
 After measuring pH & cond. use these samples
for silica test.
 Color the sample by using reagents following
sample coloring procedure.
 Do Baseline Calibration of the silica meter for
each sample by using DM water

13. Quality measurement: Silica cont’d
Cautions:
 Use safety equipment properly.
 Use separate pipette for each coloring reagent
 Do baseline calibration for each sample

14. Quality measurement: Sodium
 Take 100 ml sample in the plastic beaker
 Add 3-4 drop reagent in it
 Rinse the sensor probe with sample
 Immerge the probe in the sample and wait
 When value is stable in pNa mood change the mood
to Na+ mood by rotating the SELECT knob.

15. Quality measurement: Silica cont’d
Cautions:
 Only use select knob
 The sensor must be above 20 mm from the bottom

16. Quality measurement: Iron

17. Quality measurement: Iron cont’d

18. Quality measurement: Iron cont’d
Cautions:
 Use safety equipment properly.
 Heat up & cool down the beaker slowly
 Take burette & pipette reading carefully
 Add ammonia drop wise and stop exactly at the end
point when congo red changes it color
 Don’t be hurry when handling the cuvette in the meter
 Be careful in setting the wavelength

19. Quality measurement: Phosphate

20. Quality measurement: Phosphate cont’d
Cautions:
 Use safety equipment properly.
 Take pipette reading carefully
 Don’t be hurry when handling the cuvette in the
meter
 Be careful in setting the wavelength
 Wait for 2 min’s for proper coloration

21. Quality measurement: Nitrite
 Take 2 ml sample in the vial by pipette
 Add 1 drop 1st
reagent and shake it
 Add drop wise 2nd
reagent and shake it until color
change to pale greenish
 Count the number of drop of the 2nd
reagent and
multiply it by 50 which gives the nitrite conc. in ppm.

22. Quality measurement: Nitrite cont’d
Cautions:
 Take pipette reading carefully
 Drop the reagent carefully

23. Quality measurement: DO
 Connect the meter’s water inlet flow line to the
sample discharge flow channel
 Push the On/Off button and wait
 When the will be stable then take the readings

24. Quality measurement: DO cont’d
Cautions:
 Connect inlet line tightly with flow channel so that
no air can add into the inlet water
 Charge the meter when it shows Low battery

25. Quality measurement: Turbidity

26. Quality measurement: Turbidity cont’d
Cautions:
 Take sample in the vial up to the mark carefully.
 Place the vial carefully in meter
 Be careful about falling down the meter and vial.

27. Attention for all chemical lab users
 Must read carefully and follow all the instruction,
labels, tags before using anything.
 Never use any equipment or chemicals without
knowing about this for your safety as well as
equipment and chemicals also.
 Last but not least, always rearrange all equipment and
chemicals as before which you have used in the
laboratory.

28. If you have any question(s), then feel free to ask