API 571 Damage Mechanisms (as per API 570) Exam Actual Questions and Answers 2026.docx

API 571 Damage Mechanisms (as per
API 570) Exam Actual Questions and
Answers 2026
Highest corrosion rate for atmospheric corrosion? -
correct answer ✅Marine and industrial, 20 mpy


Up to what temp does atmospheric corrosion increase? -
correct answer ✅250F


How to inspect for atmospheric corrosion? (Three) -
correct answer ✅VT, UT thickness, profile RT


What materials does atmospheric corrosion affect? (Three) -
correct answer ✅Low alloy, carbon steel, Cu alloyed Al


What materials does boiler water and steam condensate affect?
(Two) -
correct answer ✅Low alloy, carbon steel


What does BWSC corrosion stem from? -
correct answer ✅CO2 and O2 (pitting) corrosion

, API 571 Damage Mechanisms (as per
API 570) Exam Actual Questions and
Answers 2026
What can increase resistance to BWSC corrosion? (Three elements)
-
correct answer ✅Cr, Cu, Mo


In BWSC corrosion, flow assisted corrosion is affected by which
temp and pH -
correct answer ✅300F, low pH


What NDE used in BWSC? (Two) -
correct answer ✅UT and RT to monitor wall thickness


What materials does caustic corrosion affect? -
correct answer ✅300 SS, 400 SS


How does caustic corrosion come about? -
correct answer ✅Caustic added to BFW to neutralize acids, or
remove S or Cl-


What does caustic corrosion look like? (general + temp, local) -
correct answer ✅General thinning at high temps (above 175F) and
localized corrosion as gouging