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NEW QUESTION # 107
PWHT is ___________ in preventing caustic SCC.
Answer: C
NEW QUESTION # 108
The rate of creep deformation is a function of the material, load and temperature. The rate of damage is sensitive to both load and temperature. Generally, an increase of about _______ or an increase of ________ on stress can cut the remaining life in half.
Answer: D
NEW QUESTION # 109
Corrosion due to acidic sour water containing H²S at a pH between 4.5 and 7.0 is called sour water corrosion. Carbon dioxide (CO²) may also be present. Which of the following materials is susceptible to sour water corrosion?
Answer: A
NEW QUESTION # 110
Carburization can be confirmed by substantial increases in _______ and loss of __________.
Answer: E
NEW QUESTION # 111
(What nondestructive examination (NDE) technique requires the least amount of surface preparation to locate wet H#S damage mechanisms?)
Answer: C
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Wet H#S damage mechanisms include hydrogen blistering, hydrogen-induced cracking (HIC), stepwise cracking (SWC), and stress-oriented hydrogen-induced cracking (SOHIC). These mechanisms are primarily internal and subsurface, as described in API RP 571.
Shear Wave Ultrasonic Testing (SWUT) is specifically highlighted in API RP 571 as a preferred screening and detection method for wet H#S damage because it can detect subsurface planar defects with minimal surface preparation. Typically, only basic coupling and access are required.
Why the other options are incorrect:
* Option A (ACFM) is a surface crack detection technique and requires relatively clean surfaces; it is not suitable for subsurface hydrogen damage.
* Option C (WFMT - Wet Fluorescent Magnetic Particle Testing) requires extensive surface preparation, coating removal, and direct access to the surface, and only detects surface-breaking flaws.
* Option D (LPT - Liquid Penetrant Testing) also requires clean, bare metal surfaces and cannot detect subsurface damage.
API RP 571 explicitly notes that ultrasonic techniques, particularly shear wave UT, are widely used for detecting internal hydrogen-related cracking with minimal disruption and surface preparation, making it the most effective choice for wet H#S damage screening.
Referenced Documents (Study Basis):
* API RP 571 - Section on Wet H#S Damage (HIC, SOHIC, Blistering)
* API Corrosion and Materials Inspection Study Guide
NEW QUESTION # 112
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