API RP-571 - Damage Mechanisms
Exam Actual Questions and Answers
2026
The 19 damage mechanisms are as follows... 1. ... embrittlement
2. ... fracture. 3. .... fatigue. 4. ..... 5. ... fatigue. 6. ... corrosion.
7. ....insulation. 8. ... water corrosion. 9. ... water .... corrosion.
10. ....dation. 11. ....cracking. 12. ... fatigue. 13. ....cracking.
14. ....corrosion. 15. ....water corrosion. 16. ....cracking.
17. ....damage. 18. .... Corrosion 19. .... attack. -
correct answer ✅Temper. Brittle. Thermal. Erosion. Mechanical.
Atmospheric. Corrosion under. Cooling. Boiler condensate. Sulfur.
Chloride stress corrosion. Corrosion. Caustic stress corrosion. HCL.
Sour. Amine stress corrosion. Wet H2S. Caustic. High temp
hydrogen.
What is temper embrittlement? -
correct answer ✅Reduction in toughness that occurs in low alloy
steels to to long term exposure to a certain heat range.
Temper embrittlement heat range? -
correct answer ✅650-1070F
Temper embrittlement affected materials? -
correct answer ✅2.25Cr-1Mo low alloy steel, 3Cr-1Mo and low
alloy Cr-Mo-V rotor steels
,API RP-571 - Damage Mechanisms
Exam Actual Questions and Answers
2026
Materials resistant to temper embrittlement? -
correct answer ✅C-0.5Mo and 1.25Cr-0.5Mo
Monitoring temper embrittlement? -
correct answer ✅Temper coupons inside reactor and impact test.
Proper pressurisation sequences.
When does temper embrittlement fracture usually occur? -
correct answer ✅Start-up and shutdown
What is brittle fracture? -
correct answer ✅Sudden rapid fracture of a material under stress
including residual where no plastic deformation occurs.
Brittle fracture affected materials? -
correct answer ✅Carbon steels and low alloy steels. 400 series are
also affected.
, API RP-571 - Damage Mechanisms
Exam Actual Questions and Answers
2026
Brittle fracture susceptible equipments? -
correct answer ✅Those constructed prior to Dec 1987. Thick
walled vessels. During start up, shutdown and hydro testing.
Appearance of brittle fracture cracks. -
correct answer ✅Straight and non-branching. Cleavage.
Monitoring for brittle fracture? -
correct answer ✅Try to find pre-existing flaws
What is thermal fatigue? -
correct answer ✅Cracking caused by variations in temperature.
What materials are affected by thermal fatigue? -
correct answer ✅All materials
How do you monitor thermal fatigue? (It's surface cracking) -
correct answer ✅VT, MT and PT. External shear wave UT.
Exam Actual Questions and Answers
2026
The 19 damage mechanisms are as follows... 1. ... embrittlement
2. ... fracture. 3. .... fatigue. 4. ..... 5. ... fatigue. 6. ... corrosion.
7. ....insulation. 8. ... water corrosion. 9. ... water .... corrosion.
10. ....dation. 11. ....cracking. 12. ... fatigue. 13. ....cracking.
14. ....corrosion. 15. ....water corrosion. 16. ....cracking.
17. ....damage. 18. .... Corrosion 19. .... attack. -
correct answer ✅Temper. Brittle. Thermal. Erosion. Mechanical.
Atmospheric. Corrosion under. Cooling. Boiler condensate. Sulfur.
Chloride stress corrosion. Corrosion. Caustic stress corrosion. HCL.
Sour. Amine stress corrosion. Wet H2S. Caustic. High temp
hydrogen.
What is temper embrittlement? -
correct answer ✅Reduction in toughness that occurs in low alloy
steels to to long term exposure to a certain heat range.
Temper embrittlement heat range? -
correct answer ✅650-1070F
Temper embrittlement affected materials? -
correct answer ✅2.25Cr-1Mo low alloy steel, 3Cr-1Mo and low
alloy Cr-Mo-V rotor steels
,API RP-571 - Damage Mechanisms
Exam Actual Questions and Answers
2026
Materials resistant to temper embrittlement? -
correct answer ✅C-0.5Mo and 1.25Cr-0.5Mo
Monitoring temper embrittlement? -
correct answer ✅Temper coupons inside reactor and impact test.
Proper pressurisation sequences.
When does temper embrittlement fracture usually occur? -
correct answer ✅Start-up and shutdown
What is brittle fracture? -
correct answer ✅Sudden rapid fracture of a material under stress
including residual where no plastic deformation occurs.
Brittle fracture affected materials? -
correct answer ✅Carbon steels and low alloy steels. 400 series are
also affected.
, API RP-571 - Damage Mechanisms
Exam Actual Questions and Answers
2026
Brittle fracture susceptible equipments? -
correct answer ✅Those constructed prior to Dec 1987. Thick
walled vessels. During start up, shutdown and hydro testing.
Appearance of brittle fracture cracks. -
correct answer ✅Straight and non-branching. Cleavage.
Monitoring for brittle fracture? -
correct answer ✅Try to find pre-existing flaws
What is thermal fatigue? -
correct answer ✅Cracking caused by variations in temperature.
What materials are affected by thermal fatigue? -
correct answer ✅All materials
How do you monitor thermal fatigue? (It's surface cracking) -
correct answer ✅VT, MT and PT. External shear wave UT.
