API 510 Inspection Techniques & Nondestructive Testing 5

Question 1

Infrared thermography (IRT) is used during pressure vessel inspection to detect:

Accepted Answer

Hot spots in refractory-lined vessels indicating lining failure or thinning

Answer

IRT detects thermal anomalies; hot spots on externally insulated or refractory-lined vessels indicate areas of lining degradation or local overheating where the protective layer has failed.

Question 2

A vessel inspector conducting a radiographic examination notes 'scattered porosity' in a weld radiograph. How is scattered porosity typically evaluated per ASME Section VIII, Division 1?

Accepted Answer

It is compared against acceptance charts that consider pore size, density, and distribution

Answer

ASME acceptance criteria for porosity use charts correlating weld thickness, individual pore size, and the number of pores in a given length to determine acceptability.

Question 3

During time-of-flight diffraction (TOFD) ultrasonic inspection, the lateral wave is used to:

Accepted Answer

Serve as a timing reference for calculating flaw depth and height

Answer

In TOFD, the lateral wave travels along the surface at a known velocity and serves as a precise timing reference, enabling accurate depth sizing of detected flaws.

Question 4

When inspecting a pressure vessel that has experienced high-temperature hydrogen attack (HTHA), the NDT method that can detect the internal microstructural damage (methane voids and fissures) most effectively is:

Accepted Answer

Automated ultrasonic testing using creeping wave or TOFD techniques

Answer

HTHA produces internal methane-filled voids and micro-fissures that conventional methods miss; advanced UT techniques such as TOFD and creeping wave UT can detect this subsurface volumetric damage.

Question 5

Per API 510, what action is required when the calculated remaining life of a pressure vessel is less than 4 years?

Accepted Answer

The next internal or on-stream inspection interval must not exceed half the remaining life

Answer

API 510 requires that when remaining life is less than 4 years, the next inspection interval shall not exceed half the remaining life to ensure the vessel is re-evaluated before reaching minimum thickness.

(API 510) API 510 Inspector Certification Practice Test

(API 510) API 510 Inspector Certification Practice Test

API 510 Inspection Techniques & Nondestructive Testing 5