API 510 Fitness-for-Service Assessment 2

Question 1

When is a Level 3 FFS assessment required instead of Level 1 or Level 2?

Accepted Answer

When Level 1 or Level 2 criteria are not satisfied or the damage is too complex for those methods

Answer

For all equipment older than 25 years regardless of condition

Answer

Whenever operating pressure exceeds 300 psig

Answer

Only for equipment classified as high consequence in the risk matrix

Question 2

In an FFS assessment, what additional data does a Level 2 local metal loss evaluation require compared to Level 1?

Accepted Answer

A detailed thickness profile or flaw characterization data across the damaged area

Answer

Only the single minimum measured thickness reading

Answer

Results of acoustic emission monitoring during operation

Answer

Full operating pressure and temperature history for 10 years

Question 3

The Folias factor (Mt) used in FFS calculations for cylindrical shells primarily depends on:

Accepted Answer

Flaw length relative to the shell radius and wall thickness

Answer

Operating temperature and corrosion rate

Answer

Material yield strength and fracture toughness

Answer

Inspection method used to characterize the flaw

Question 4

In FFS terminology, what distinguishes 'local' metal loss from 'general' (far-field) metal loss?

Accepted Answer

Local loss is confined to a limited region while general loss is widespread thinning

Answer

Local loss occurs on the external surface while general loss is internal

Answer

Local loss is found near welds and general loss occurs on base metal only

Answer

Local loss exceeds 50% of the original wall while general loss is less than 50%

Question 5

What is the significance of the 'zone of influence' concept when multiple flaws are present in an FFS assessment?

Accepted Answer

It identifies the region around each flaw where stress fields interact, determining if nearby flaws must be combined

Answer

It defines the personnel exclusion zone around pressurized equipment

Answer

It specifies the inspection coverage area required around each detected flaw

Answer

It defines the buffer distance from a flaw to a structural support

Question 6

If an FFS assessment shows a component does NOT meet acceptance criteria at its current MAWP, which of the following is an acceptable response per API 579-1/ASME FFS-1?

Accepted Answer

Rerate the component to a lower MAWP at which it does satisfy FFS criteria

Answer

Continue operating and schedule a shutdown at the next turnaround

Answer

Apply an external protective coating and recheck in 30 days

Answer

Perform a hydrostatic test at 1.5 times MAWP to confirm fitness

Question 7

Which of the following best describes the 'critical thickness profile' used in FFS metal loss assessments?

Accepted Answer

A map of measured thickness values across the damaged region used to define flaw geometry

Answer

The minimum wall thickness required by the applicable construction code

Answer

The thickness at which equipment must be immediately taken out of service

Answer

The original mill-supplied thickness tolerance for the plate material