Title: Quiz API - API-571 - Corrosion and Materials Professional¨CEfficient Valid Exam T [Print This Page] Author: jerryne496 Time: yesterday 13:00 Title: Quiz API - API-571 - Corrosion and Materials Professional¨CEfficient Valid Exam T P.S. Free & New API-571 dumps are available on Google Drive shared by BraindumpsPass: https://drive.google.com/open?id=1e4Js0ql_HUW40_fqW3DTAK9-VuOeag0X
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The endurance limit is usually about:
A. Half way up the ladder of a 150' column (tower).
B. 10-20% of a material's yield strength.
C. 10-20% of a material's ultimate tensile strength.
D. 40-50% of a material's ultimate tensile strength
E. 40-50% of a material's yield strength.
Answer: D
NEW QUESTION # 41
Hydrogen permeation or diffusion rates associated with wet H#S damage of carbon steel and low-alloy steels have been found to be minimal at a pH of:
A. 0
B. 1
C. 2
D. 3
Answer: D
Explanation:
API RP 571 discusses this under Wet H#S Damage - Hydrogen Blistering, HIC, SOHIC:
"Hydrogen generation is reduced as pH increases. At pH 9 and above, the corrosion potential is less favorable for hydrogen charging and thus permeation into the steel is minimal."
"Most wet H#S cracking damage mechanisms are accelerated under acidic conditions (pH < 7)." Hence, high pH (around 9) environments offer the most protection against hydrogen damage, making option D the correct choice.
NEW QUESTION # 42
High strength, low allow steels such as A193-B7 bolts and compressor parts are susceptible to hydrogen stress cracking. A193-B7M bolts are susceptible if __________.
A. None of the above
B. Exposed
C. Double nutted
D. Overtorqued
Answer: D
NEW QUESTION # 43
High temperature hydrogen attack results from exposure to hydrogen at elevated temperatures and pressures.
The hydrogen reacts with __________ in steel to produce _________, which cannot diffuse through the steel.
The loss of carbides causes an overall loss in strength.
A. Carbides, methane
B. Carbides, oxygen
C. Alloys, hydrogen dioxide
D. Hydrogen dioxide, H2S
Answer: A
NEW QUESTION # 44
General or localized corrosion of carbon steels and other metals caused by dissolved salts, gases, organic compounds or microbiological activity is called _______.