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
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
