API 510 Non-Destructive Examination Methods 5

Question 1

Which NDE method is used in API 510 fitness-for-service evaluations to characterize the dimensions of an embedded crack-like flaw in a pressure vessel wall for fracture mechanics calculations?

Accepted Answer

Phased array ultrasonic testing (PAUT) for both length and through-wall height measurement

Answer

Phased array UT (PAUT) combined with TOFD or conventional UT techniques is used to accurately characterize flaw height and length needed for fracture mechanics-based fitness-for-service assessment per API 579.

Question 2

What condition must be met before applying liquid penetrant testing to a pressure vessel that was in high-temperature service (above 500°F)?

Accepted Answer

The surface must be at or below 125°F before applying penetrant

Answer

ASME Section V limits penetrant application to surfaces between 40°F and 125°F (unless procedure qualification covers other ranges), so hot surfaces must cool adequately before PT can be applied.

Question 3

During time-of-flight diffraction (TOFD) ultrasonic examination, what is the 'lateral wave' and why is it significant?

Accepted Answer

A wave traveling along the outer surface used as a timing reference for shallow defect sizing

Answer

In TOFD, the lateral wave travels along the outer (entry) surface and arrives first at the receiver; it serves as a timing reference and defines the near-surface dead zone above which shallow defects cannot be resolved.

Question 4

Per API 510 and ASME V, when is a written NDE procedure required to be qualified and demonstrated?

Accepted Answer

For all NDE methods whenever ASME Code or API 510 requires written procedures

Answer

ASME Section V and API 510 require written, qualified procedures for all specified NDE methods to ensure repeatability, consistency, and documented technical basis for the examination.

Question 5

What is 'pulsed eddy current' (PEC) testing particularly advantageous for in pressure vessel inspection applications?

Accepted Answer

Measuring wall thickness through insulation, fireproofing, and coatings without removal

Answer

Pulsed eddy current is specifically designed for screening wall thickness through insulation, fireproofing, and protective coatings, making it the primary tool for CUI detection surveys without insulation removal.

(API 510) Certified Pressure Vessel Inspector Practice Test

(API 510) Certified Pressure Vessel Inspector Practice Test

API 510 Non-Destructive Examination Methods 5