2016 Volume 65 Issue 5 Pages 205-210
An all volatile treatment (oxidizing) (AVT (O)) is expected as countermeasures against flow accelerated corrosion (FAC) of carbon steel piping at a power plant. Dissolved oxygen (DO) in the feed water inhibits FACs while DO can cause local corrosions at high temperature. A hydrazine (N2H4) eliminates DO at high temperature. We discussed the FAC mitigation effect of AVT (O+N2H4) where N2H4 was added to the feed water under AVT (O) condition. From the corrosion test of carbon steel pipes in NH3 solution at 150 ℃ under the high flow rate condition, FAC inhibition effect of DO at 15 μg/L is indicated in the presence of N2H4.