NDT Codes and Standards 4 — Questions and Answers
Question 1: Which ASTM standard covers the standard practice for liquid penetrant examination?
- ASTM E165 (Correct answer)
- ASTM E709
- ASTM E94
- ASTM E1001
Correct answer: ASTM E165
ASTM E165 is the Standard Practice for Liquid Penetrant Examination for General Industry.
Question 2: In the context of NDT codes, what is a 'procedure qualification record' (PQR)?
- A document certifying the NDT inspector's qualifications
- A record documenting the variables used during a welding procedure specification test (Correct answer)
- A log of all indications found during an examination
- A calibration certificate for NDT equipment
Correct answer: A record documenting the variables used during a welding procedure specification test
A PQR records the actual welding variables used during a test weld and the results of testing used to qualify a Welding Procedure Specification (WPS).
Question 3: According to ASME Section V Article 4, what is the maximum film density allowed for radiographic examination of welds in steel?
- 1.8 to 4.0 H&D
- 2.0 to 4.0 H&D (Correct answer)
- 1.0 to 3.0 H&D
- 2.5 to 4.5 H&D
Correct answer: 2.0 to 4.0 H&D
ASME Section V Article 4 requires radiographic film density to be between 2.0 and 4.0 (H&D) in the area of interest for steel radiography.
Question 4: Which code governs the inspection of aboveground atmospheric storage tanks?
- API 510
- API 570
- API 653 (Correct answer)
- ASME Section VIII
Correct answer: API 653
API 653 is the Tank Inspection, Repair, Alteration, and Reconstruction standard for aboveground atmospheric storage tanks.
Question 5: In ANSI/ASNT CP-189, what distinguishes it from SNT-TC-1A regarding personnel certification?
- CP-189 is voluntary while SNT-TC-1A is mandatory
- CP-189 establishes standardized national requirements while SNT-TC-1A is an employer-based recommended practice (Correct answer)
- CP-189 applies only to aerospace while SNT-TC-1A covers all industries
- There is no practical difference between the two documents
Correct answer: CP-189 establishes standardized national requirements while SNT-TC-1A is an employer-based recommended practice
ANSI/ASNT CP-189 is a national standard with minimum requirements for certification, while SNT-TC-1A is a recommended practice that employers adapt for their own written practice.
Question 6: What is the purpose of an image quality indicator (IQI) in radiographic testing?
- To measure the actual size of a discontinuity
- To demonstrate the sensitivity and quality of the radiographic image (Correct answer)
- To calibrate the X-ray machine voltage
- To determine the chemical composition of the weld
Correct answer: To demonstrate the sensitivity and quality of the radiographic image
An IQI (also called a penetrameter) verifies that the radiographic technique achieves the minimum required image quality and sensitivity.
Question 7: Under MIL-STD-1689 (Navy surface ship welding), which NDT method is required as the primary method for full-penetration hull welds?
- Magnetic particle testing
- Liquid penetrant testing
- Ultrasonic testing
- Radiographic testing (Correct answer)
Correct answer: Radiographic testing
MIL-STD-1689 requires radiographic testing as the primary volumetric examination method for full-penetration hull structure welds.
NDT Codes and Standards 4
Which ASTM standard covers the standard practice for liquid penetrant examination?