MARK'S API 510 COMPREHENSIVE EXAM 2026/2027
QUESTIONS AND SOLUTIONS RATED A+
✔✔All in-service pressure relief devices in the petrochemical industry must:
a) Have an inspection plan
b) Be built to ASME Section VIII
c) Be set at a pressure not higher than 100% of MAWP
d) Have an balanced bellows - ✔✔A
✔✔The inspection plan for a pressure vessel should be developed by:
a) The Inspector
b) The Engineer
c) Both the Inspector and the Engineer
d) Either the Inspector or the Engineer - ✔✔D
✔✔The inspection plan for a pressure relief device should be developed by:
a) The Inspector
b) The Engineer
c) Either the Inspector or the Engineer
d) Both the Inspector and the Engineer - ✔✔C
✔✔When developing a vessel's inspection plan, who should help, when needed, to
identify specific damage mechanisms and their locations?
a) Inspector
b) Corrosion specialist
c) Engineer
d) Either the Corrosion specialist or the Engineer
e) Either the Corrosion Specialist or the Inspector or the Engineer - ✔✔B
✔✔A significant factor in developing an inspection plan is to determine the:
a) Anticipated costs
b) Anticipated schedule
c) Availability of NDE examiners
d) Potential damage mechanisms - ✔✔D
✔✔What is the MOST important factor when selecting the NDE to use in a future
inspection?
a) Ability of the method to find the anticipated damage mechanism
b) Availability of NDE method
c) Cost of NDE method
d) Ease of use of the NDE method - ✔✔A
✔✔Which of the following is NOT a factor in determining the interval for examinations in
a vessel's Inspection Plan?
,a) Cost of equipment outage
b) IOW exceedances
c) Maximum code intervals
d) Probability of the NDE will find expected damage
e) Rate of damage occurring - ✔✔A
✔✔Which of the following is NOT required to be included in a vessel's Inspection Plan?
a) Name of individual that will perform the inspection
b) Next inspection date
c) Surface cleaning requirements
d) Type of NDE that will be used - ✔✔A
✔✔Which of the following is NOT required in a vessel's Inspection Plan?
a) Lighting requirements
b) Location where NDE will be performed
c) Planned pressure tests
d) Planned repairs - ✔✔A
✔✔What "Optional Item" should be part of a vessel's Inspection Plan?
a) Confined entry requirements
b) Special access requirements
c) Special lighting requirements
d) Types of damage expected in the vessel - ✔✔D
✔✔In the RBI process, what are the two primary factors used to determine risk?
a) Consequence of Failure and Service Class
b) Reliability and the On-stream percentage
c) Probability and Consequence of Failure
d) Inspection Effectiveness and Corrosion Mechanism - ✔✔C
✔✔Who is responsible to decide whether an RBI assessment will be used to determine
inspection intervals for a pressure vessel?
a) Corrosion Specialist
b) Inspector
c) Owner / User
d) Pressure Equipment Engineer - ✔✔C
✔✔RBI assessments should be done in accordance with:
a) API 579
b) API 580
c) API 583
d) API 584 - ✔✔B
,✔✔Which of the following is NOT a significant factor in an RBI assessment of a
pressure vessel?
a) Vessel construction code
b) Process fluid
c) Potential degradation mechanisms
d) Effectiveness of past inspections - ✔✔A
✔✔During a risk assessment, which of the following is NOT a significant factor in the
Probability of Failure?
a) Amount of process fluid
b) Expected damage mechanism(s)
c) Quality of the inspection program
d) Quality of the maintenance program - ✔✔A
✔✔During an RBI assessment of a pressure vessel, what are the two biggest factors of
Consequence of Failure?
a) Amount of product and expected corrosion rate
b) Amount of product and type of product
c) Expected corrosion rate and type of product
d) Quality of inspection program and quality of maintenance program - ✔✔B
✔✔During a RBI assessment, which of the following is not a significant factor in the
Consequence of Failure?
a) Environmental damage
b) Equipment damage
c) Equipment downtime
d) Health impacts
e) Public image - ✔✔E
✔✔All RBI assessments must be:
a) Thoroughly documented
b) Repeated every 5 years
c) Approved only by the authorized inspector
d) Conducted per guidelines in API 579 - ✔✔A
✔✔An RBI assessment is used to determine the interval for the internal inspection.
When does the RBI assessment NOT have to be repeated?
a) After each internal inspection
b) After any significant process change
c) After any significant change in inspection personnel
d) After any significant hardware change
e) At least once every 10 years - ✔✔C
✔✔All NDE equipment used in petrochemical facilities must:
, a) Have a safety rating appropriate for the gaseous environment at the exam site
b) Be calibrated daily
c) Be used by a technician that is qualified to ASNT SNT-TC-1A
d) Have an ASME Section V approval seal - ✔✔A
✔✔Which of the following is NOT a requirement prior to performing an internal vessel
inspection?
a) Review previous vessel history
b) Obtain permission from the appropriate operation personnel
c) Check that all equipment used during the inspection is safe to use
d) Be certified as an ASNT SNT-TC-1A Level 2 in VT - ✔✔D
✔✔Prior to performing an inspection the inspector should:
a) Calibrate their pit gauge
b) Familiarize themselves with prior history
c) Review API 571 for expected damage mechnanisms
d) Retake an eye test - ✔✔B
✔✔Prior to performing an inspection, which of the following is NOT a requirement for
the inspector?
a) Familiarize themselves with current inspection plan
b) Familiarize themselves with past inspection plans
c) Familiarize themselves with prior inspection history
d) Familiarize themselves with prior repairs. - ✔✔B
✔✔Which of the following damage mechanisms creates either general or localized
corrosion?
a) Graphitization
b) HTHA
c) Naphthenic Acid
d) Temper Embrittlement - ✔✔C
✔✔Which of the following damage mechanisms does NOT create either general or
localized corrosion?
a) Fatigue
b) Galvanic
c) MIC
d) Sulfidation - ✔✔A
✔✔Which of the following damage mechanisms does NOT create surface connected
cracks?
a) Chloride stress corrosion cracking
b) Hydrogen induced cracking
c) Polythionic stress corrosion cracking
QUESTIONS AND SOLUTIONS RATED A+
✔✔All in-service pressure relief devices in the petrochemical industry must:
a) Have an inspection plan
b) Be built to ASME Section VIII
c) Be set at a pressure not higher than 100% of MAWP
d) Have an balanced bellows - ✔✔A
✔✔The inspection plan for a pressure vessel should be developed by:
a) The Inspector
b) The Engineer
c) Both the Inspector and the Engineer
d) Either the Inspector or the Engineer - ✔✔D
✔✔The inspection plan for a pressure relief device should be developed by:
a) The Inspector
b) The Engineer
c) Either the Inspector or the Engineer
d) Both the Inspector and the Engineer - ✔✔C
✔✔When developing a vessel's inspection plan, who should help, when needed, to
identify specific damage mechanisms and their locations?
a) Inspector
b) Corrosion specialist
c) Engineer
d) Either the Corrosion specialist or the Engineer
e) Either the Corrosion Specialist or the Inspector or the Engineer - ✔✔B
✔✔A significant factor in developing an inspection plan is to determine the:
a) Anticipated costs
b) Anticipated schedule
c) Availability of NDE examiners
d) Potential damage mechanisms - ✔✔D
✔✔What is the MOST important factor when selecting the NDE to use in a future
inspection?
a) Ability of the method to find the anticipated damage mechanism
b) Availability of NDE method
c) Cost of NDE method
d) Ease of use of the NDE method - ✔✔A
✔✔Which of the following is NOT a factor in determining the interval for examinations in
a vessel's Inspection Plan?
,a) Cost of equipment outage
b) IOW exceedances
c) Maximum code intervals
d) Probability of the NDE will find expected damage
e) Rate of damage occurring - ✔✔A
✔✔Which of the following is NOT required to be included in a vessel's Inspection Plan?
a) Name of individual that will perform the inspection
b) Next inspection date
c) Surface cleaning requirements
d) Type of NDE that will be used - ✔✔A
✔✔Which of the following is NOT required in a vessel's Inspection Plan?
a) Lighting requirements
b) Location where NDE will be performed
c) Planned pressure tests
d) Planned repairs - ✔✔A
✔✔What "Optional Item" should be part of a vessel's Inspection Plan?
a) Confined entry requirements
b) Special access requirements
c) Special lighting requirements
d) Types of damage expected in the vessel - ✔✔D
✔✔In the RBI process, what are the two primary factors used to determine risk?
a) Consequence of Failure and Service Class
b) Reliability and the On-stream percentage
c) Probability and Consequence of Failure
d) Inspection Effectiveness and Corrosion Mechanism - ✔✔C
✔✔Who is responsible to decide whether an RBI assessment will be used to determine
inspection intervals for a pressure vessel?
a) Corrosion Specialist
b) Inspector
c) Owner / User
d) Pressure Equipment Engineer - ✔✔C
✔✔RBI assessments should be done in accordance with:
a) API 579
b) API 580
c) API 583
d) API 584 - ✔✔B
,✔✔Which of the following is NOT a significant factor in an RBI assessment of a
pressure vessel?
a) Vessel construction code
b) Process fluid
c) Potential degradation mechanisms
d) Effectiveness of past inspections - ✔✔A
✔✔During a risk assessment, which of the following is NOT a significant factor in the
Probability of Failure?
a) Amount of process fluid
b) Expected damage mechanism(s)
c) Quality of the inspection program
d) Quality of the maintenance program - ✔✔A
✔✔During an RBI assessment of a pressure vessel, what are the two biggest factors of
Consequence of Failure?
a) Amount of product and expected corrosion rate
b) Amount of product and type of product
c) Expected corrosion rate and type of product
d) Quality of inspection program and quality of maintenance program - ✔✔B
✔✔During a RBI assessment, which of the following is not a significant factor in the
Consequence of Failure?
a) Environmental damage
b) Equipment damage
c) Equipment downtime
d) Health impacts
e) Public image - ✔✔E
✔✔All RBI assessments must be:
a) Thoroughly documented
b) Repeated every 5 years
c) Approved only by the authorized inspector
d) Conducted per guidelines in API 579 - ✔✔A
✔✔An RBI assessment is used to determine the interval for the internal inspection.
When does the RBI assessment NOT have to be repeated?
a) After each internal inspection
b) After any significant process change
c) After any significant change in inspection personnel
d) After any significant hardware change
e) At least once every 10 years - ✔✔C
✔✔All NDE equipment used in petrochemical facilities must:
, a) Have a safety rating appropriate for the gaseous environment at the exam site
b) Be calibrated daily
c) Be used by a technician that is qualified to ASNT SNT-TC-1A
d) Have an ASME Section V approval seal - ✔✔A
✔✔Which of the following is NOT a requirement prior to performing an internal vessel
inspection?
a) Review previous vessel history
b) Obtain permission from the appropriate operation personnel
c) Check that all equipment used during the inspection is safe to use
d) Be certified as an ASNT SNT-TC-1A Level 2 in VT - ✔✔D
✔✔Prior to performing an inspection the inspector should:
a) Calibrate their pit gauge
b) Familiarize themselves with prior history
c) Review API 571 for expected damage mechnanisms
d) Retake an eye test - ✔✔B
✔✔Prior to performing an inspection, which of the following is NOT a requirement for
the inspector?
a) Familiarize themselves with current inspection plan
b) Familiarize themselves with past inspection plans
c) Familiarize themselves with prior inspection history
d) Familiarize themselves with prior repairs. - ✔✔B
✔✔Which of the following damage mechanisms creates either general or localized
corrosion?
a) Graphitization
b) HTHA
c) Naphthenic Acid
d) Temper Embrittlement - ✔✔C
✔✔Which of the following damage mechanisms does NOT create either general or
localized corrosion?
a) Fatigue
b) Galvanic
c) MIC
d) Sulfidation - ✔✔A
✔✔Which of the following damage mechanisms does NOT create surface connected
cracks?
a) Chloride stress corrosion cracking
b) Hydrogen induced cracking
c) Polythionic stress corrosion cracking
