The presentation outlined the process for collecting and testing boiler water samples to monitor quality parameters. Key steps included collecting samples from various locations in the boiler, and then measuring parameters like pH, conductivity, silica, phosphate, iron, sodium, and more using specific testing procedures and equipment. Safety precautions were emphasized throughout to properly handle chemicals, sensors, and testing instruments.

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