Amine Stress Corrosion Cracking

Question 1

1. Amine Stress Corrosion Cracking normally occurs in:

A. 300 series SS
B. Boilers
C. Hydro-treaters
D. Non-stressed relieved Carbon Steel

Answer 1

D. Non-stressed relieved Carbon Steel

Question 2

2. Amine Stress Corrosion Cracking affects:

A. aluminums
B. carbon steels and low alloys
C. 300 series stainless steels
D. most plant construction materials

Answer 2

B. carbon steels and low alloys

Question 3

3. Which of the following is NOT a factor in Amine Stress Corrosion Cracking?

A. Type of Amine
B. Temperature
C. Tensile Stress
D. Fluid Velocity

Answer 3

D. Fluid Velocity

Question 4

4. Amine Stress Corrosion Cracking normally occurs in:

A. lean amine
B. rich amine service
C. pure amine service
D. low temperature amine service

Answer 4

A. lean amine

Question 5

5. In rich amine service, any: (open book)

A. H2S in the process significantly increases the rate of Amine SCC.
B. H2S in the process forms an iron-sulfide scale that reduces the cracking rate.
C. CO3 in the process significantly increases the rate of Amine SCC.
C. CO3 in the process forms an iron-sulfide scale that reduces the cracking rate.

Answer 5

B. H2S in the process forms an iron-sulfide scale that reduces the cracking rate.

Question 6

6. A common way for Amine Stress Corrosion Cracking to occur is by:

A. increasing the amine concentration
B. increasing the amine velocity
C. steaming out amine piping/equipment during an outage
D. stress relieving

Answer 6

C. steaming out amine piping/equipment during an outage

Question 7

7. Amine Stress Corrosion Cracking typically initiates in:

A. on the ID surface in center of the weld.
B. on the ID surface about 1/10” away from the HAZ.
C. on the OD surface in center of the weld.
D. on the OD surface about 1/10” away from the HAZ.

Answer 7

B. on the ID surface about 1/10” away from the HAZ.

Question 8

8. In the base metal of piping and vessels, Amine Stress Corrosion Cracking normally:

A. starts in the weld and stays in the weld.
B. starts in the weld and extends into the base metal.
C. cracks parallel to the weld.
D. cracks transverse to the weld.

Answer 8

C. cracks parallel to the weld.

Question 9

9. What is the recommended action to do prior to welding an existing non-PWHT’d pipe/equipment that has been in Amine Service?

A. Neutralize with acid
B. Neutralize with caustic
C. Steam Out
D. Water wash

Answer 9

D. Water wash

Question 10

10. What is the preferred way to check for Amine Stress Corrosion Cracking? * This may have more than one correct answer, please select all answers that apply

A. ACFM
B. ECT
C. PT
D. RT
E. UT Straight Beam
F. WFMT

Answer 10

A. ACFM
B. ECT
F. WFMT