API 510 - Pressure Vessel Inspector practice questions

Question 1

An inspector is assigned to a vertical pressure vessel in hydrocarbon service located inside a refinery process unit. The owner/user asks whether API 510 applies or if API 570 should be used instead because the vessel has multiple nozzles and connected piping. Which is the best determination?

Accepted Answer

API 510 applies to the pressure vessel; API 570 applies to associated piping systems, and boundaries should be defined accordingly

Answer

API 570 applies to the entire system because it is in a process unit, including the vessel shell and heads

Answer

API 510 applies only if the vessel was built to ASME Section VIII; otherwise neither API 510 nor API 570 applies

Answer

API 510 applies only to vessels containing steam; hydrocarbon vessels are covered by API 570

Question 2

During an audit, the inspector finds that inspection records for several vessels are incomplete and that no corrosion rate calculations are documented. Who has primary responsibility to maintain records and ensure an inspection program is implemented?

Accepted Answer

The owner/user

Answer

The authorized inspector only

Answer

The vessel manufacturer

Answer

The jurisdictional authority only

Question 3

A pressure vessel has a calculated remaining life of 18 years based on the limiting component. The owner/user asks the inspector to set the next internal inspection interval. Assuming no RBI program is used and no other limiting factors apply, what is the maximum internal inspection interval allowed by API 510?

Accepted Answer

9 years

Answer

6 years

Answer

10 years

Answer

18 years

Question 4

A vessel in hot service is insulated and located outdoors. During an external inspection, the inspector suspects corrosion under insulation (CUI) near a support ring and several penetrations. Which action best aligns with API 510 expectations for external inspection planning?

Accepted Answer

Document the concern and schedule targeted insulation removal at susceptible locations to examine the external surface

Answer

Wait until the next internal inspection because external surfaces cannot be evaluated while insulated

Answer

Increase the PSV set pressure to reduce the likelihood of CUI-related leaks

Answer

Perform only hardness testing because CUI is primarily a metallurgical issue

Question 5

An inspector is collecting UT thickness readings on a corroding vessel shell course. To support future corrosion rate calculations and interval setting, which practice is most appropriate?

Accepted Answer

Use repeatable measurement locations (CMLs/TMLs) and document exact locations and readings

Answer

Take random readings each time to avoid bias and average them into one value

Answer

Measure only near manways because they represent the thinnest areas

Answer

Record only the minimum reading and discard the rest to simplify records

Question 6

A vessel shell had a measured thickness of 0.750 in. at a TML in 2019. In 2025, the same TML measures 0.690 in. What is the long-term corrosion rate at that location?

Accepted Answer

0.006 in/yr

Answer

0.010 in/yr

Answer

0.060 in/yr

Answer

0.090 in/yr

Question 7

At a TML, the current thickness is 0.520 in. The required thickness (tmin) is 0.440 in. The established corrosion rate is 0.008 in/yr. What is the remaining life at this location?

Accepted Answer

10 years

Answer

5 years

Answer

12.5 years

Answer

65 years

Question 8

A cylindrical shell course (ASME VIII-1) has outside diameter Do = 60.0 in and measured thickness t = 0.500 in at the limiting TML (excluding corrosion allowance). Joint efficiency E = 0.85. Material allowable stress S = 17,000 psi at temperature. Using the ASME VIII-1 thin shell formula for internal pressure…

Accepted Answer

290 psi

Answer

210 psi

Answer

240 psi

Answer

340 psi

Question 9

During internal inspection, the inspector finds localized metal loss (pitting) in a shell course that is below tmin when measured at the pit bottom, but surrounding thickness is above tmin. The owner/user asks what evaluation approach is most appropriate before deciding on repair or rerate.

Accepted Answer

Perform a fitness-for-service assessment in accordance with API 579-1/ASME FFS-1

Answer

Immediately scrap the vessel because any pit below tmin is automatic retirement

Answer

Increase inspection frequency only; no analysis is needed if average thickness exceeds tmin

Answer

Use ASME Section IX to qualify a new WPS and continue operating

Question 10

A vessel cannot be taken out of service for an internal inspection due to unit constraints. The owner/user proposes an on-stream inspection plan using UT scanning and external NDE. Which statement best reflects API 510 expectations?

Accepted Answer

On-stream inspection may be used in lieu of internal inspection when justified and when the inspection methods can effectively evaluate expected damage mechanisms

Answer

On-stream inspection is never permitted as a substitute for internal inspection

Answer

On-stream inspection is permitted only if the vessel is in steam service

Answer

On-stream inspection requires increasing the MAWP to compensate for uncertainty

API 510 - Pressure Vessel Inspector practice questions

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API 510 - Pressure Vessel Inspector practice questions

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