API 510 Fitness-for-Service Assessment 3

Question 1

Which part of API 579-1/ASME FFS-1 is used to evaluate Hydrogen-Induced Cracking (HIC) and blistering damage?

Accepted Answer

Part 7 – Assessment of Hydrogen Blistering, HIC, SOHIC, and Soft Zones

Answer

Part 4 – General Metal Loss

Answer

Part 9 – Assessment of Crack-Like Flaws

Answer

Part 13 – Assessment of Laminations

Question 2

When performing an FFS assessment for pitting corrosion per API 579-1/ASME FFS-1 Part 6, the inspector must characterize:

Accepted Answer

Pit depth, diameter, and the density and distribution pattern of pits across the surface

Answer

Only the single deepest pit depth found in the survey

Answer

The exact chemical composition of the corrosion product filling the pits

Answer

Only whether pits are located within 1 inch of a weld seam

Question 3

The Failure Assessment Diagram (FAD) used in API 579-1/ASME FFS-1 Part 9 for crack-like flaws simultaneously evaluates:

Accepted Answer

Brittle fracture and plastic collapse failure modes

Answer

Corrosion rate versus remaining service life

Answer

Operating temperature limits and maximum pressure limits

Answer

Weld quality versus required inspection frequency

Question 4

When evaluating fire-damaged pressure equipment using FFS methodology, the primary concern for the inspector is:

Accepted Answer

Potential degradation of material mechanical properties due to elevated temperature exposure

Answer

Cosmetic damage and loss of insulation on the equipment exterior

Answer

Loss of corrosion inhibitor coating on the vessel shell

Answer

Damage to instrumentation and pressure relief device setpoints

Question 5

In a FFS assessment for creep damage, which operating parameter combination drives damage accumulation most significantly?

Accepted Answer

Operating temperature and cumulative time at elevated temperature

Answer

Cyclic pressure range and number of cycles experienced

Answer

Fluid velocity and pipe diameter (erosion-creep interaction)

Answer

Original design safety factor and current corrosion allowance

Question 6

What is the 'reference flaw' concept used in fracture mechanics-based FFS crack assessments?

Accepted Answer

A conservatively assumed maximum flaw size based on NDE detection limits used as the starting point for assessment

Answer

A calibration notch machined into a reference block for NDE system setup

Answer

A crack found in a reference vessel of identical design and material

Answer

The average flaw size measured across all inspection locations

Question 7

According to API 579-1/ASME FFS-1, what must an inspector verify before applying any FFS assessment procedure to a pressure vessel?

Accepted Answer

That the original equipment design met an applicable recognized and generally accepted good engineering practice (RAGAGEP)

Answer

That the vessel has passed a visual inspection with no external corrosion present

Answer

That the vessel has been in continuous service for at least five years

Answer

That a Level 1 assessment has been attempted and failed before proceeding