API 571 Inspection and Mitigation Techniques 2

Question 1

Long-range ultrasonic testing (LRUT/guided wave testing) is primarily used for which inspection task?

Accepted Answer

Screening large lengths of pipe for corrosion and metal loss anomalies from a single access point

Answer

Guided wave testing screens hundreds of feet of pipe from a single transducer ring location, identifying anomalies that are then characterized with conventional UT.

Question 2

Acoustic emission testing (AE) is most useful for which inspection application?

Accepted Answer

Detecting active crack growth or leakage during pressure or hydrostatic testing

Answer

AE monitoring detects acoustic signals generated by active damage mechanisms such as crack propagation or fluid leakage, providing real-time detection during pressurization.

Question 3

Which inspection technique is recommended for mapping corrosion under insulation (CUI) without full insulation removal?

Accepted Answer

Computed radiography (CR) or profile radiographic testing (RT)

Answer

Profile RT or computed radiography can image the pipe cross-section through insulation, revealing the corrosion profile without requiring complete insulation removal.

Question 4

The primary purpose of a Risk-Based Inspection (RBI) assessment is to accomplish what objective?

Accepted Answer

Prioritize inspection resources by identifying the highest-risk equipment based on probability and consequence of failure

Answer

RBI evaluates both probability and consequence of failure for all equipment, directing inspection resources to the highest-risk items while extending intervals for low-risk equipment.

Question 5

Positive Material Identification (PMI) is performed in refineries to accomplish which objective?

Accepted Answer

Verify alloy chemical composition to prevent wrong-material installations

Answer

PMI using XRF or OES spectroscopy verifies that installed materials match the specified alloy grade, preventing catastrophic failures from wrong-material installations.

API 571 - API 571 Corrosion and Materials Practice Test

API 571 - API 571 Corrosion and Materials Practice Test

API 571 Inspection and Mitigation Techniques 2