NDT Boilermaker Structural Integrity Assessments 3

Question 1

Which ASME code section primarily governs the inspection, repair, and alteration of power boilers in service?

Accepted Answer

ASME Section I (Power Boilers)

Answer

ASME Section I establishes the rules for construction of power boilers, and its requirements are used as the basis for in-service inspection, repair, and alteration standards.

Question 2

During an acoustic emission (AE) test of a pressure vessel, an increase in AE activity at a specific sensor location during pressurization MOST likely indicates:

Accepted Answer

Active crack growth or plastic deformation at that location

Answer

Acoustic emission testing detects stress waves released by active crack propagation or plastic deformation, and increased AE activity at a location suggests a developing discontinuity.

Question 3

When assessing corrosion under insulation (CUI) in boiler systems, which NDT technique is preferred because it can inspect through the insulation without removal?

Accepted Answer

Pulsed eddy current testing

Answer

Pulsed eddy current (PEC) testing can measure wall thickness through insulation and coatings without requiring their removal, making it ideal for CUI inspection.

Question 4

A boiler tube shows evidence of external pitting corrosion. What measurement is MOST critical to determine whether the tube must be replaced?

Accepted Answer

Remaining wall thickness at the deepest pit

Answer

The remaining wall thickness at the deepest pit determines whether sufficient material exists to withstand operating pressure, which is the critical acceptance criterion.

Question 5

In phased array ultrasonic testing (PAUT) of boiler welds, what advantage does electronic scanning provide over conventional single-element UT?

Accepted Answer

Multiple angles can be inspected simultaneously without moving the probe

Answer

PAUT uses electronically controlled focal laws to steer and focus the beam at multiple angles simultaneously, increasing coverage and detection probability without physical probe movement.

(NDT) Boilermaker Nondestructive Testing Certification Practice Test

(NDT) Boilermaker Nondestructive Testing Certification Practice Test

NDT Boilermaker Structural Integrity Assessments 3