Safety & Risk Management Flashcards
7 cards from real API 510 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Safety & Risk Management flashcards as text
API 510 defines the 'corrosion allowance' as the material provided beyond the minimum required thickness to account for:
Answer: Metal loss due to corrosion and erosion over the service life
Corrosion allowance is the additional material thickness provided above the calculated minimum to accommodate expected metal loss from corrosion and erosion during the vessel's service life.
When performing a thickness measurement on a vessel shell, the inspector finds a localized thin area. Under API 579 Level 1 assessment for general metal loss, the critical thickness profile (CTP) requires measurements that cover:
Answer: The most corroded region with a grid pattern to establish the extent of thinning
API 579 Level 1 general metal loss assessment requires a CTP established by systematic grid measurements over the affected region to accurately characterize the damage.
An inspector notes high-temperature hydrogen attack (HTHA) damage concern on a vessel operating above 300°F with hydrogen partial pressure. The primary reference document for assessing HTHA susceptibility is:
Answer: API 941 (Nelson Curves)
API 941 contains the Nelson Curves, which define the operating limits of carbon and alloy steels for HTHA based on hydrogen partial pressure and temperature.
In a risk-based inspection plan, equipment with HIGH consequence of failure but LOW probability of failure should be prioritized by:
Answer: Focusing inspection on verifying damage mechanism controls and barrier integrity
High-COF, low-POF equipment warrants ensuring damage mechanisms are controlled and protection layers are intact, even though current failure probability is low.
The Maximum Allowable Working Pressure (MAWP) of a pressure vessel after metal loss is recalculated using the:
Answer: Actual measured minimum thickness, not the original design thickness
After metal loss, MAWP must be recalculated using the actual minimum measured thickness to reflect the vessel's current condition, not the original design values.
During an RBI re-assessment, an inspector discovers that the actual corrosion rate is significantly higher than the rate assumed in the original RBI study. The required response is to:
Answer: Update the RBI analysis with the new rate and revise inspection intervals accordingly
RBI is a living program; when actual rates deviate significantly from assumed rates, the analysis must be updated and intervals revised to maintain acceptable risk levels.
According to API 510 and process safety principles, a 'near miss' incident involving a pressure vessel should be:
Answer: Investigated and documented to identify root causes and prevent recurrence
Near misses are leading indicators of potential catastrophic events; API 510 and PSM principles require investigation and documentation to identify and correct root causes before a real incident occurs.