CRI CRI Acceptance Criteria & Discontinuity Evaluation 2 — Questions and Answers
Question 1: Which ASME acceptance standard applies to radiographic examination of pressure vessel welds fabricated under Section VIII Division 1?
- UW-51 and UW-52 (Correct answer)
- Section IX QW-191
- B31.3 Table 341.3.2
- AWS D1.1 Clause 6
Correct answer: UW-51 and UW-52
ASME Section VIII Division 1 paragraphs UW-51 (spot RT) and UW-52 (full RT) govern acceptance criteria for pressure vessel weld radiographs.
Question 2: An elongated indication whose length is greater than three times its width is classified as which type?
- Linear (Correct answer)
- Rounded
- Planar
- Volumetric
Correct answer: Linear
Any indication with a length-to-width ratio exceeding 3:1 is classified as linear under standard radiographic acceptance criteria.
Question 3: Under ASME B31.3 normal fluid service, what is the maximum acceptable rounded indication score for a full radiograph of a weld in material 3/4 inch thick?
- 10 (Correct answer)
- 20
- 30
- 5
Correct answer: 10
ASME B31.3 Table 341.3.2 sets the maximum rounded indication score at 10 for normal fluid service welds up to 3/4 inch thickness.
Question 4: Cold lap (overlap) in a weld radiograph appears as which characteristic image feature?
- A dark, irregular line along the weld toe with smooth edges (Correct answer)
- A cluster of round dark spots
- A light density area near the weld crown
- Parallel dark lines through the full weld thickness
Correct answer: A dark, irregular line along the weld toe with smooth edges
Cold lap appears as a dark irregular line at the weld toe representing unfused metal that has rolled over without bonding.
Question 5: When a radiographic indication is found to be JUST at the acceptance limit, what is the correct CRI action?
- Accept the indication if it exactly meets but does not exceed the limit (Correct answer)
- Reject because indications at the limit require engineering review
- Accept only after consulting the client
- Repeat the exposure to confirm
Correct answer: Accept the indication if it exactly meets but does not exceed the limit
Standard radiographic acceptance criteria are inclusive—an indication that exactly meets the limit (does not exceed it) is acceptable per the governing code.
Question 6: Which discontinuity in castings appears radiographically as an irregular, feathery or branching dark area typically at hot spots?
- Shrinkage porosity (Correct answer)
- Gas porosity
- Cold shut
- Misrun
Correct answer: Shrinkage porosity
Shrinkage porosity forms in castings as metal contracts during solidification, creating an irregular branching dark area on the radiograph at thermal hot spots.
CRI CRI Acceptance Criteria & Discontinuity Evaluation 2
Which ASME acceptance standard applies to radiographic examination of pressure vessel welds fabricated under Section VIII Division 1?