API 510 Wet H2S Damage- Blistering/HIC/SOHIC/SCC

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Author:
egf4201
ID:
312002
Filename:
API 510 Wet H2S Damage- Blistering/HIC/SOHIC/SCC
Updated:
2015-11-24 11:04:35
Tags:
API 510 Wet H2S Damage Blistering HIC SOHIC SCC
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API 510 Wet H2S Damage- Blistering/HIC/SOHIC/SCC
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API 510 Wet H2S Damage- Blistering/HIC/SOHIC/SCC
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  1. Hydrogen blistering is caused by
    atomic hydrogen collects in a discontinuity & combines to form molecular hydrogen
  2. Atomic hydrogen is
    released during sulfide corrosion
  3. Hydrogen blisters that form at different depths can cause
    cracking between the blisters
  4. HIC (Hydrogen Induced Cracking) that occurs between hydrogen blisters at different depths in the metal may appear as
    stair-step cracks
  5. SOHIC (Stress Oriented Hydrogen Induced Cracking) usually occurs
    in the base metal adjacent to the heat affected zone
  6. SCC (Sulfide Stress Cracking) occurs as a result of the combined action of
    tensile stress and corrosion in the presences of water and H2S
  7. Where does SCC (Sulfide Stress Cracking) typically occur
    High hardness areas
  8. Which of the following materials is susceptible to Wet H2S damage?
    A) Only C.S.
    B) C.S., low alloys (chromes), and 300 series S.S.
    C) all materials
    D) C.S. and low alloys (chromes)
    D) C.S. and low alloys (chromes)
    (this multiple choice question has been scrambled)
  9. The rate of hydrogen diffusing into steel is minimal at
    7 pH
  10. Hydrogen damage can occur when the system has liquid water and dissolved H2S greater than
    50 wppm
  11. Hydrogen damage can occur at temps
    between ambient and 300°F
  12. To minimize the potential for SSC, the hardness in C.S. should be less than
    200 HB
  13. To minimize the potential for Hydrogen Blistering, what is the max hardness allowed in C.S.
    Hardness does not affect hydrogen blistering
  14. Hydrogen blistering and HIC are strongly affected by
    presence of inclusions in the steel
  15. Which of the following does not reduce the chance for Hydrogen Blistering or HIC?
    A) Maintain a pH of 7.0
    B) PWHT
    C) Select high-nickel alloys
    D) Use of "clean" steels
    B) PWHT
    (this multiple choice question has been scrambled)
  16. Which of the following in the process stream increases the probability of Hydrogen Blistering or HIC?
    A) Polytheonics
    B) Napthenics
    C) Chlorides
    D) Cyanides
    D) Cyanides
    (this multiple choice question has been scrambled)
  17. Which of the following should not be used to inspect for Wet H2S Cracking?
    A)SWUT
    B) WFMPT
    C) PT
    D) RT
    E) ACFM
    F) EC
    C) PT
    (this multiple choice question has been scrambled)

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