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

Precisely sizing remaining wall thickness at known corrosion locations

Answer

Detecting surface-breaking SCC in stainless steel piping

Answer

Measuring weld hardness for SSC compliance

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

Measuring corrosion rate in real time during operation

Answer

Screening for corrosion under insulation from the surface

Answer

Identifying the chemical composition of alloy materials

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

Conventional UT spot measurements through insulation cutouts

Answer

Magnetic particle testing from the external surface

Answer

Visual inspection through insulation cutouts only

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

Replace all inspection intervals with fixed time-based schedules

Answer

Eliminate the need for physical inspection of low-risk equipment

Answer

Satisfy insurance and regulatory requirements without changing inspection practice

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

Measure remaining wall thickness to verify corrosion allowance

Answer

Detect weld hardness for sour service compliance

Answer

Assess extent of creep damage in high-temperature piping

Question 6

API 571-recommended mitigation for wet H2S damage includes which combination of measures?

Accepted Answer

PWHT, use of HIC-resistant steel, and process chemical injection (inhibitors/neutralizers)

Answer

Increasing operating temperature to evaporate water and eliminate the wet condition

Answer

Cathodic protection of vessel internals only

Answer

Increasing fluid velocity to prevent H2S concentration