API-580 Inspection Techniques and NDE

Question 1

Which nondestructive examination (NDE) method is most effective for detecting subsurface flaws in thick-walled pressure vessels?

Accepted Answer

Ultrasonic testing (UT)

Answer

Ultrasonic testing uses high-frequency sound waves to detect internal flaws, measure wall thickness, and characterize defects in thick-walled equipment, providing depth and size information for subsurface discontinuities.

Question 2

What is the purpose of a Fitness-for-Service (FFS) assessment in RBI?

Accepted Answer

To determine if equipment with known flaws can continue to operate safely

Answer

FFS assessments, typically performed per API 579-1, evaluate whether equipment containing flaws, damage, or deviations from original design can continue operating safely, often avoiding unnecessary shutdowns or replacements.

Question 3

What does corrosion rate monitoring using coupons involve?

Accepted Answer

Installing metal samples in process streams and measuring weight loss over time

Answer

Corrosion coupons are pre-weighed metal specimens installed in process streams for a defined period, then removed and weighed to calculate the corrosion rate based on weight loss, area, and exposure time.

Question 4

When is radiographic testing (RT) preferred over ultrasonic testing for weld inspection?

Accepted Answer

When a permanent record of the inspection is needed and for detecting volumetric flaws

Answer

RT is preferred when a permanent film or digital record is needed, for detecting volumetric discontinuities (porosity, inclusions), and for initial weld acceptance inspection where permanent documentation is required.

Question 5

What is the purpose of acoustic emission testing (AET) in RBI programs?

Accepted Answer

To detect active flaws by monitoring stress waves released during crack growth

Answer

AET monitors high-frequency stress waves emitted by active flaws (growing cracks, leaks, corrosion) in real-time, making it valuable for detecting actively deteriorating conditions during operation.

API-580 Exam Practice Test

API-580 Exam Practice Test

API-580 Inspection Techniques and NDE