API 510 Documentation and Records Management 3 — Questions and Answers
Question 1: A pressure vessel's calculated remaining life is 10 years. What is the maximum allowable inspection interval per API 510 for external inspection?
- 5 years (half the remaining life, not to exceed 5 years) (Correct answer)
- 10 years
- 2.5 years
- 1 year
Correct answer: 5 years (half the remaining life, not to exceed 5 years)
External inspection interval is the lesser of half the remaining corrosion life or 5 years per API 510.
Question 2: Which record would an inspector review to determine the corrosion allowance of a pressure vessel?
- The original ASME Manufacturer's Data Report (MDR) or engineering design documentation (Correct answer)
- The most recent inspection report only
- The maintenance work order log
- The plant's safety data sheets
Correct answer: The original ASME Manufacturer's Data Report (MDR) or engineering design documentation
The MDR and original design documents specify the corrosion allowance used in the original design calculations.
Question 3: What does a 'fitness-for-service' assessment record typically include?
- Current measured thickness, flaw characterization, stress analysis, and a fitness conclusion with limitations (Correct answer)
- Only the name of the engineer who performed the assessment
- A visual inspection photo only
- The original purchase order for the vessel
Correct answer: Current measured thickness, flaw characterization, stress analysis, and a fitness conclusion with limitations
An FFS assessment per API 579 documents the current state of the vessel, analysis methodology, and resulting operating limitations.
Question 4: When a vessel is re-rated to a higher MAWP, what documentation is required per API 510?
- Calculations signed by an engineer, AI concurrence, updated nameplate or records, and jurisdictional notification if required (Correct answer)
- A verbal agreement between the owner and operator
- Only a new purchase order for a replacement vessel
- A manufacturer's letter of authorization only
Correct answer: Calculations signed by an engineer, AI concurrence, updated nameplate or records, and jurisdictional notification if required
Re-rating requires engineering calculations, Authorized Inspector review, record update, and compliance with any jurisdictional notification requirements.
Question 5: What is the primary purpose of recording thickness measurement locations with sketches or coordinate systems in inspection records?
- To enable reproducible measurement at the same location in future inspections for accurate corrosion rate determination (Correct answer)
- To satisfy aesthetic documentation standards
- To identify the vessel for tax purposes
- To replace the need for non-destructive testing equipment
Correct answer: To enable reproducible measurement at the same location in future inspections for accurate corrosion rate determination
Reproducible measurement locations allow point-to-point comparison over time, which is essential for calculating accurate corrosion rates.
Question 6: How should an inspector handle discrepancies found between current vessel dimensions and those on the original MDR?
- Document the discrepancy, investigate the cause, and resolve through engineering review before the vessel returns to service (Correct answer)
- Ignore minor discrepancies if the vessel appears sound
- File a new MDR immediately without investigation
- Shut down the vessel permanently
Correct answer: Document the discrepancy, investigate the cause, and resolve through engineering review before the vessel returns to service
Discrepancies must be documented and investigated to determine if the vessel has been altered, damaged, or if the original records are in error.
Question 7: What is the correct procedure when an inspection reveals that required records (e.g., the original MDR) are missing?
- Reconstruct records through engineering review, inspection, and calculations, then document the basis for continued safe operation (Correct answer)
- Continue operating the vessel without records until they are found
- Replace the vessel immediately without investigation
- Assume the vessel meets code and document that assumption only
Correct answer: Reconstruct records through engineering review, inspection, and calculations, then document the basis for continued safe operation
API 510 allows missing records to be reconstructed through engineering methods, with the basis and assumptions fully documented.
API 510 Documentation and Records Management 3
A pressure vessel's calculated remaining life is 10 years.
What is the maximum allowable inspection interval per API 510 for external inspection?