API 510 Inspection Methods & Nondestructive Testing 2

Question 1

When performing wet fluorescent magnetic particle testing (WFMT) on a pressure vessel weld, what is the primary advantage over dry magnetic particle testing?

Accepted Answer

Higher sensitivity for detecting fine, shallow surface cracks

Answer

WFMT uses fluorescent particles suspended in liquid, providing higher sensitivity for fine cracks compared to dry MT methods.

Question 2

During radiographic testing of a pressure vessel shell, which IQI (image quality indicator) placement is preferred per ASME Section V?

Accepted Answer

Source side of the weld, adjacent to the area of interest

Answer

ASME Section V requires IQIs to be placed on the source side to demonstrate the minimum detectable flaw size at the most critical location.

Question 3

An API 510 inspector uses time-of-flight diffraction (TOFD) ultrasonics on a thick-walled vessel. What is a known limitation of TOFD near the scanning surface?

Accepted Answer

Dead zone near the surface due to lateral wave interference

Answer

TOFD has a near-surface dead zone caused by the lateral wave masking reflections from shallow defects.

Question 4

Which eddy current technique is most effective for detecting corrosion and pitting on the inner surface of non-ferromagnetic heat exchanger tubes from the outside?

Accepted Answer

Remote field eddy current (RFEC)

Answer

Remote field eddy current (RFEC) penetrates the full wall of ferromagnetic tubes; for non-ferromagnetic tubes, conventional ET from inside or RFEC from inside is used, but pulsed eddy current from the outside detects wall loss through insulation.

Question 5

When applying liquid penetrant testing (PT) to an austenitic stainless steel pressure vessel nozzle, which post-emulsifier type requires the most careful control of emulsification time?

Accepted Answer

Lipophilic (oil-based) emulsifier

Answer

Lipophilic emulsifiers work by diffusion, so over-emulsification can remove penetrant from true defects if contact time is not carefully controlled.

(API 510) Certified Pressure Vessel Inspector Practice Test

(API 510) Certified Pressure Vessel Inspector Practice Test

API 510 Inspection Methods & Nondestructive Testing 2