API 570 EXAM STUDY GUIDE
BOILER WATER CONDENSATE CORROSION
MODULE 2 : PART 9
API 571 : 4.3.5 : Boiler Water Condensate Corrosion
Description of Damage
* General Corrosion and pitting
* In the boiler system and condensate return piping
* internal only
Affected Materials
*CS
*Some Low Alloy Steels, Some 300 Series SS and Cu based alloys
*Most of the boiler piping will be of CS so this affects primarily to Carbon Steel
Other Critical Factors
*Corrosion protection in the boiler is done by maintaining a layer of protective Fe3O4 (Magnetite)
*Ammonia SCC of Cu-Zn alloys can occur due to hydrazine, neutralizing amines or ammonia-containing compounds. That means the compounds used for oxygen scavenging treatments may adversely affect Cu-Zn alloys in the system.
Inspection & Monitoring
*Water analysis is the common monitoring tool. pH, conductivity, Cl or residual biocide and TDS will be checked
*There are no proactive inspection methods for this DM.
Deaerator cracking can be found from WFMPI, during shutdowns.
Related Mechanisms
*CO2 corrosion
*Corrosion Fatigue
*Erosion/Corrosion-Corrosion
QUESTIONS
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