STEAM AND WATER
ANALYSIS SYSTEM (SWAS)
By Naveed Irshad
Contents
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Why Required SWAS
Sampling Conditioning/ Wet Panel
Schematic Diagram of Sample Inlet
Important Equipments of Sample System
Sample Analysis
pH Analyzer
Conductivity Analyzer
Silica Analyzer
DO Analyzer
Phosphate Analyzer
• DO’S & DON’TS
• CONCLUSION
Steam and water analysis system
[
(SWAS)
• Corrosion and erosion are major concerns in thermal power plants
operating on steam. The steam reaching the turbines need to be
ultra-pure and hence needs to be monitored for its quality.
• Corrosion damage boiler welding joints, boiler tubing and piping.
• Boiler feedwater must be free of impurities
Continue….
A well-designed Steam and Water Analysis system (SWAS) can help in
monitoring the critical parameters in the steam. These parameters
include pH, conductivity, silica, sodium, dissolved oxygen, phosphate
and chlorides.
International standards
These aspects are well explained in international standards like ASME
PTC 19.11-2008 and VGB S006 -00 2012_09_EN. The International
Association for the Properties of Water and Steam (IAPWS) also gives
good information on important measurement points and its
significance.