API 510 Inspection Planning and Scheduling — Questions and Answers
Question 1: What determines the inspection interval for pressure vessels under API 510?
- A fixed 5-year schedule for all vessels
- The lesser of half the remaining life or 10 years (Correct answer)
- Manufacturer recommendation only
- When the vessel fails
Correct answer: The lesser of half the remaining life or 10 years
API 510 sets internal inspection intervals at the lesser of half the estimated remaining life or 10 years, with a minimum of the corrosion rate-based interval.
Question 2: What is risk-based inspection (RBI) in the context of API 510?
- Inspecting only when requested
- Prioritizing inspection activities based on risk assessment of likelihood and consequence of failure (Correct answer)
- Random inspection scheduling
- Inspecting new vessels only
Correct answer: Prioritizing inspection activities based on risk assessment of likelihood and consequence of failure
RBI uses risk assessment to prioritize inspection resources toward equipment with the highest risk of failure and greatest consequences.
Question 3: What information should be reviewed before conducting a pressure vessel inspection?
- Nothing - start inspecting immediately
- Previous inspection reports, operating history, and maintenance records (Correct answer)
- Marketing materials
- Competitor information
Correct answer: Previous inspection reports, operating history, and maintenance records
Reviewing previous reports, operating history, and maintenance records identifies known issues, trends, and areas requiring special attention.
Question 4: What is an on-stream inspection?
- Inspection during vessel shutdown
- Inspection performed while the equipment remains in service (Correct answer)
- Inspection of flowing water
- Inspection of new equipment
Correct answer: Inspection performed while the equipment remains in service
On-stream inspection is performed while equipment remains in service, using NDE techniques that do not require shutdown or entry.
Question 5: How should inspection findings be documented and tracked?
- In personal notes only
- In formal reports with measurements, photos, and recommendations maintained in equipment files (Correct answer)
- Verbally to management
- In temporary files deleted after review
Correct answer: In formal reports with measurements, photos, and recommendations maintained in equipment files
Formal documentation with measurements, photographs, and recommendations creates a permanent record for trending and future reference.
Question 6: What triggers an unscheduled inspection of a pressure vessel?
- Calendar anniversaries
- Process upsets, unusual operating conditions, or suspected damage (Correct answer)
- Employee complaints
- Budget availability
Correct answer: Process upsets, unusual operating conditions, or suspected damage
Unscheduled inspections are triggered by abnormal events such as process upsets, overpressure incidents, or suspected damage requiring immediate evaluation.
API 510 Inspection Planning and Scheduling
What determines the inspection interval for pressure vessels under API 510?