API 510 Documentation 4 — Questions and Answers
Question 1: When documenting a weld repair on a pressure vessel per API 510, which of the following is required?
- The welder's personal contact information
- The WPS, welder qualifications, preheat/PWHT records, and NDE results (Correct answer)
- Only the final visual inspection result
- The repair cost estimate
Correct answer: The WPS, welder qualifications, preheat/PWHT records, and NDE results
Weld repair documentation must include the welding procedure specification (WPS), welder qualifications, preheat and post-weld heat treatment records, and nondestructive examination results.
Question 2: In API 510, what documentation is required to support a pressure test performed after a repair or alteration?
- A handwritten note from the inspector
- Test pressure value, duration, medium used, date, and results (Correct answer)
- Only the go/no-go pass result
- The insurance policy number
Correct answer: Test pressure value, duration, medium used, date, and results
Pressure test records must document the test pressure, hold duration, test medium, date performed, and outcome to verify the integrity of the repaired vessel.
Question 3: Under API 510, which party is responsible for maintaining the official inspection records for a pressure vessel?
- The original equipment manufacturer
- The owner-user of the equipment (Correct answer)
- The jurisdictional authority
- The third-party inspection contractor
Correct answer: The owner-user of the equipment
API 510 places responsibility for maintaining inspection records on the owner-user, who must keep them current and accessible throughout the vessel's service life.
Question 4: What information about inspection findings must be documented in the vessel's record to allow future corrosion rate calculations?
- Only the thinnest reading found anywhere on the vessel
- Measured thickness values at specific documented TML locations with dates (Correct answer)
- The average thickness of the entire shell
- The percentage of surface area inspected only
Correct answer: Measured thickness values at specific documented TML locations with dates
Corrosion rate calculations require thickness readings tied to specific, documented TML locations with corresponding dates so that metal loss over time can be computed.
Question 5: According to API 510, what must be documented when an inspector determines that a vessel can continue in service with a known defect (fitness-for-service)?
- Only a verbal agreement with the plant engineer
- The FFS evaluation basis, acceptance criteria applied, and any monitoring requirements imposed (Correct answer)
- The defect's photo only
- The original design safety factor
Correct answer: The FFS evaluation basis, acceptance criteria applied, and any monitoring requirements imposed
When a defect is accepted under FFS principles, API 510 requires documenting the evaluation basis, which acceptance criteria were applied, and any ongoing monitoring or restrictions.
Question 6: When a vessel is re-rated to a lower MAWP under API 510, what must be updated in the records?
- Only the control room operating card
- The inspection record, the nameplate (if required), and operating procedures reflecting the new MAWP (Correct answer)
- The original fabrication data report only
- Nothing; verbal notification to operators is sufficient
Correct answer: The inspection record, the nameplate (if required), and operating procedures reflecting the new MAWP
A re-rating requires updating inspection records, potentially stamping or replacing the nameplate, and revising operating procedures to prevent operation above the new lower MAWP.
Question 7: For API 510 compliance, what minimum information must be traceable from a thickness reading back to the inspection record?
- Only the reading value
- The reading value, TML location identifier, date, and instrument/method used (Correct answer)
- The inspector's payroll number
- The vessel's nameplate data only
Correct answer: The reading value, TML location identifier, date, and instrument/method used
Each thickness reading must be traceable to its TML location, the date it was taken, and the measurement method or instrument used to ensure data quality and enable corrosion trending.
API 510 Documentation 4
When documenting a weld repair on a pressure vessel per API 510, which of the following is required?