1. Corrosion Products Sampler (CPS)

2. New CPS Features New flow meter & totalizer AC connection standard
90-264Vac 47-63Hz input
Battery option available
Battery indication meter
Average 3 month runtime between charges
24-48 hr recharge time
Total volume is customer resettable
Flow rate can also be displayed (mL/min)
IEC Connector

3. Corrosion Products Sampler (CPS)
Collects a sample of dissolved and particulate materials
Totalizes sample flow
ASTM D
Corrosion studies and pseudo on-line corrosion analysis
Boiler tubes, pre-heaters, condenser

4. CPS Flow Diagram

5. CPS Benefits Identify corrosion products Locate source of corrosion
Collects particulates for metals analysis - Fe, Cu
Use anion and cation filters for dissolved metals
Locate source of corrosion
Quantify rate of corrosion
Measure effectiveness of treatment
Locate areas of corrosion product accumulation

6. Major Components High pressure filter holder
Totalizing meter for high accuracy/low flow rates
Flow control circuit
Optional bypass circuit
Optional sample cooler (Above 55C)
Optional battery pack

7. Sample Point Selection
Based on:
System design
Subject constituents
Chemical treatment
System specific problems

8. Corrosion Corrosion affects: Equipment reliability Plant safety
Efficiency and capacity

9. Corrosion Specifically: Material degeneration at point of attack
Migration through the system
Collection on turbine blades
Collection on heat transfer surfaces
Accumulation at various points leading to additional corrosion

10. Why Sample? Improve plant safety & equipment reliability
Increase plant efficiency and capacity
Reduce frequency between routine cleanings of plant heat exchanger equipment
Reduce plant operating costs

11. Why Sample? Use sample data to: Make adjustments in treatment
Make adjustments in lay up procedures
Schedule maintenance

12. Why Sample? Locate the sources of corrosion products
Economizer, Condenser, etc.
Determine the rate of corrosion
Historical base, startup deviations, treatment changes
Identify the type and cause of the corrosion
Type of material
Track the path of corrosion products
Collection, settling, material removal

13. Typical Sampling Points
Hotwell
Monitor starting concentrations.
DA Outlet
Monitor quality of feedwater indicating problems with feedwater system components.
Economizer Inlet
Quality of feedwater entering the boiler
Steam
Quality of steam to turbine

15. Proper Corrosion Products Sampling Technique
Isokinetic Sampling
Sample velocity entering sample port is same as sample stream
Sample Flow rate
Constant, continuous
New lines should be “seasoned”
Location
As close as possible to the source
Fittings/Bends
Minimize
Tube Diameters
Select to provide 6 ft/sec velocity for water
Sample Tube Compatibility
Refer to ASTM Method D1192, D1066

16. Proper Corrosion Products Sampling Technique
Grab samples are not enough!
Corrosion is dynamic and does not follow a regular pattern
Transport is not uniform
Varies with flow rates
Crud bursts

17. Proper Corrosion Products Sampling Technique
A better alternative to grab sampling: An integrated sample
A measured flow through a filter for a significant period of time
Collect insoluble and soluble products
.45 micron filter
Ion exchange filters
Measure total flow

18. Proper Corrosion Products Sampling Technique
Analyze filtered products
Acid digestion + atomic absorption
X-ray fluorescence
Calculate average concentrations

20. Corrosion Products Sampler Design Criteria
Inlet Isolation Valve
Sample Cooler
Bypass Flow Stream
Filter Isolation Valve
Filter Purge
Filter Holder
Flow Control Circuit

21. Inlet Isolation Valve
Designed to minimize corrosion product buildup, ball or plug type if possible.
Valve packing, stem and tip selected for the application

22. Sample Cooler
Must be capable of reducing the sample inlet temperature to below 122 F (50 C) with the correct sample line velocity
Sample to be cooled using a single stage cooler having no internal weld joints on the tube side

23. Bypass Flow Stream Used to establish the correct sample line velocity
Helps to reduce and/or eliminate the effects caused by starting and stopping of sample flows through the sample filter assembly during routine changing of the filter paper

24. Filter Isolation Valve
Isolates the filter holder during assembly and disassembly
The valve should be a ball or plug type

25. Filter Purge
Used to purge the filter holder assembly between corrosion product collections
Eliminates cross contamination between samples
Removes corrosion particulate that may have been released because of mechanical vibration during filter disassembly

26. High Pressure Filter Holder
Designed to house up to one particulate filter and five ion exchange filters
The screwed type design will minimize mechanical agitation during assembly and/or disassembly.
Sample taken at high pressure to ensure corrosion products are not removed by the pressure reducing valve
Pressure rating of 3000 psia (206 bar) and temperature of 149 F (65 C)

27. Conclusion
Corrosion Products Samplers can be an invaluable resource to:
Locate the sources of corrosion products
Determine the rate of corrosion
Identify the type and cause of the corrosion
Track the path of corrosion products

28. Conclusion Improve plant safety & equipment reliability
Increase plant efficiency and capacity
Reduce frequency between routine cleanings of plant heat exchanger equipment
Reduce plant operating costs