MARK'S API 510 FINAL EXAM 2026/2027 QUESTIONS AND
SOLUTIONS RATED A+
✔✔MAWP is defined as the maximum pressure:
a) Anywhere on the vessel
b) At the bottom of the vessel
c) At the mid-point of the vessel
d) At the top of the vessel - ✔✔D
✔✔MAT is defined as the:
a) Maximum allowed temperature
b) Minimum allowed temperature
c) Maximum allowed toughness.
d) Minimum allowed toughness. - ✔✔B
✔✔Internal distribution piping is:
a) Considered a non-pressure boundary vessel component
b) Considered a pressure boundary vessel component
c) Designed to the vessel construction code
d) Designed to a piping construction code - ✔✔A
✔✔Which of following is NOT correct concerning plate lining?
a) Lining is installed on the inside of the vessel
b) Lining can be plate or weld buildup
c) Lining is welded to the shell
d) Usually the lining is a more corrosion resistant material than the shell - ✔✔B
✔✔Which of the following equipment types is covered by API 510?
a) Knock out drum rated at 12 psig at 400°F
b) Tubular heater
c) Unfired steam boiler
d) A 36" expansion joints - ✔✔C
✔✔A pressure vessel engineer must:
a) Have a list of experts to call for specific situations.
b) Know the answer to every question posed by an Inspector
c) Be directly employed by the Owner / User
d) Have obtained Professional Engineer status - ✔✔A
✔✔The physical activities that are conducted to check conformance with specifications
are called:
a) Examinations
b) Inspections
c) Quality Assurance
,d) Quality Control - ✔✔D
✔✔A repair on a vessel is defined as:
a) Any physical change with design implications.
b) The work necessary to restore a vessel to new condition
c) The work necessary to restore a vessel to a suitable safe condition
d) Any cutting or welding performed on the pressure boundary - ✔✔C
✔✔A vessel's hemi-spherical head has corroded is going to be replaced in-kind at the
next outage. The vessel is rated for 150 psig at 700°F. The vessel has 60" ID. Which of
the following is true?
a) This work is considered an alteration
b) This work is considered a repair
c) This work is considered a rerate
d) This work must be done in accordance with API 2201 - ✔✔B
✔✔Which of the following is NOT considered API 510 Repair Organization for vessel?
a) A contract company that is acceptable to the Owner/User
b) The governing Jurisdiction for the location of the pressure vessel
c) The Owner / User that owns the pressure vessel
d) A holder of a valid NBIC "R" Stamp - ✔✔B
✔✔Which of the following is NOT considered a vessel rerate?
a) Decrease the MDMT
b) Increase the design pressure
c) Increase the design temperature
d) Increase the fluid viscosity - ✔✔D
✔✔In a RBI assessment, the two primary factors or Risk are the:
a) Consequence of Failure & Potential Damage resulting from a Failure
b) Consequence of Failure & Probability of Failure
c) Likelihood of Failure & Probability of Failure
d) Likelihood of Failure & Community Impact of Failure - ✔✔B
✔✔What is the difference between plate lining and strip lining?
a) Plate lining is welded inside the vessel, strip lining is welded outside the vessel
b) Plate lining is the same material as the vessel, strip lining is a different material with
increased corrosion resistance.
c) Plate lining is butt welded, strip lining is fillet welded
d) Plate lining is wider than strip lining - ✔✔D
✔✔Temper embrittlement occurs in certain materials when:
a) The operation temperature is within 30°F of the vessel's MDMT
b) Weld repairs are performed and the metal temperature is below 32°F
,c) The process temperatures exceed 650°F
d) The process environment contains low temperature caustic - ✔✔C
✔✔Low chrome materials are subject to temper-embrittlement. These materials are:
a) Brittle when new
b) Become brittle due to welding
c) Brittle at temperature above 650°F
d) Brittle at low temperatures dues to metallurgical changes that occurred during high
temperature operation - ✔✔D
✔✔A pressure test used after maintenance work to assure that the equipment is leak
free:
a) Is called a leak test
b) Is called a tightness test
c) Is performed at a pressure based on the construction code formula
d) Is performed at a pressure based on the API 510 formula - ✔✔B
✔✔Who is responsible to ensure that all API 510 requirements of are met?
a) Authorized Inspector
b) Jurisdiction
c) Manufacturer
d) Owner/User
e) Pressure Vessel Engineer - ✔✔D
✔✔Who is responsible to ensure that the Authorized Inspection Agency functions in
accordance with the requirements of API 510?
a) Authorized Inspector
b) Jurisdiction
c) Owner/User
d) Pressure Vessel Engineer
e) Pressure Equipment Department Manager - ✔✔C
✔✔Each Owner/User that uses API 510 must:
a) Maintain a quality assurance inspection / repair management system
b) Employ (direct-hire) at least one pressure equipment engineer
c) Maintain an "R" stamp for vessel repairs
d) Employ (direct-hire) at least one qualified welder who can make repairs to pressure
vessels - ✔✔A
✔✔Which of the following is NOT required to be in the Onwer/User's quality assurance
inspection / repair management system?
a) Training requirements for inspection personnel
b) Calibration of NDE equipment
c) Directions on how to document inspection results
d) Specify approval process for calculation performed during vessel rerating
, e) Ensure all inspectors attend MSTS classes!!! - ✔✔E
✔✔Inspectors shall have an eye test every:
a) 3 months
b) 6 months
c) 12 months
d) 24 months - ✔✔C
✔✔What is the name of the Inspector's mandatory eye test?
a) Jaeger - with J-1 letters
b) Jaeger - withJ-2 letters
c) OAA - Level 2 letters
d) OAA - Level 6 letters - ✔✔A
✔✔Who is responsible for implementing an effective Management of Change process?
a) Authorized Inspection Agency
b) Jurisdiction
c) Owner / User
d) Pressure Equipment Engineer
e) Repair Organization - ✔✔C
✔✔A MOC system should be used to review and control changes made to:
a) The process
b) Hardware
c) Either the process or the hardware
d) The organizational structure of personnel involved in vessel integrity - ✔✔C
✔✔Who needs to be involved in the approval process for MOC's that affect pressure
vessel integrity?
a) Corrosion Specialist
b) Inspection Group
c) Jurisdiction
d) Pressure Equipment Engineer - ✔✔B
✔✔Who is responsible for implementing an effective program for establishing Integrity
Operating Windows (IOWs)?
a) Authorized Inspectors
b) Inspection Group
c) Owner / User
d) Pressure Equipment Engineer
e) Process Engineer - ✔✔C
✔✔Who should be made aware of deviations outside the OIWs?
a) Authorized Inspection Agency
SOLUTIONS RATED A+
✔✔MAWP is defined as the maximum pressure:
a) Anywhere on the vessel
b) At the bottom of the vessel
c) At the mid-point of the vessel
d) At the top of the vessel - ✔✔D
✔✔MAT is defined as the:
a) Maximum allowed temperature
b) Minimum allowed temperature
c) Maximum allowed toughness.
d) Minimum allowed toughness. - ✔✔B
✔✔Internal distribution piping is:
a) Considered a non-pressure boundary vessel component
b) Considered a pressure boundary vessel component
c) Designed to the vessel construction code
d) Designed to a piping construction code - ✔✔A
✔✔Which of following is NOT correct concerning plate lining?
a) Lining is installed on the inside of the vessel
b) Lining can be plate or weld buildup
c) Lining is welded to the shell
d) Usually the lining is a more corrosion resistant material than the shell - ✔✔B
✔✔Which of the following equipment types is covered by API 510?
a) Knock out drum rated at 12 psig at 400°F
b) Tubular heater
c) Unfired steam boiler
d) A 36" expansion joints - ✔✔C
✔✔A pressure vessel engineer must:
a) Have a list of experts to call for specific situations.
b) Know the answer to every question posed by an Inspector
c) Be directly employed by the Owner / User
d) Have obtained Professional Engineer status - ✔✔A
✔✔The physical activities that are conducted to check conformance with specifications
are called:
a) Examinations
b) Inspections
c) Quality Assurance
,d) Quality Control - ✔✔D
✔✔A repair on a vessel is defined as:
a) Any physical change with design implications.
b) The work necessary to restore a vessel to new condition
c) The work necessary to restore a vessel to a suitable safe condition
d) Any cutting or welding performed on the pressure boundary - ✔✔C
✔✔A vessel's hemi-spherical head has corroded is going to be replaced in-kind at the
next outage. The vessel is rated for 150 psig at 700°F. The vessel has 60" ID. Which of
the following is true?
a) This work is considered an alteration
b) This work is considered a repair
c) This work is considered a rerate
d) This work must be done in accordance with API 2201 - ✔✔B
✔✔Which of the following is NOT considered API 510 Repair Organization for vessel?
a) A contract company that is acceptable to the Owner/User
b) The governing Jurisdiction for the location of the pressure vessel
c) The Owner / User that owns the pressure vessel
d) A holder of a valid NBIC "R" Stamp - ✔✔B
✔✔Which of the following is NOT considered a vessel rerate?
a) Decrease the MDMT
b) Increase the design pressure
c) Increase the design temperature
d) Increase the fluid viscosity - ✔✔D
✔✔In a RBI assessment, the two primary factors or Risk are the:
a) Consequence of Failure & Potential Damage resulting from a Failure
b) Consequence of Failure & Probability of Failure
c) Likelihood of Failure & Probability of Failure
d) Likelihood of Failure & Community Impact of Failure - ✔✔B
✔✔What is the difference between plate lining and strip lining?
a) Plate lining is welded inside the vessel, strip lining is welded outside the vessel
b) Plate lining is the same material as the vessel, strip lining is a different material with
increased corrosion resistance.
c) Plate lining is butt welded, strip lining is fillet welded
d) Plate lining is wider than strip lining - ✔✔D
✔✔Temper embrittlement occurs in certain materials when:
a) The operation temperature is within 30°F of the vessel's MDMT
b) Weld repairs are performed and the metal temperature is below 32°F
,c) The process temperatures exceed 650°F
d) The process environment contains low temperature caustic - ✔✔C
✔✔Low chrome materials are subject to temper-embrittlement. These materials are:
a) Brittle when new
b) Become brittle due to welding
c) Brittle at temperature above 650°F
d) Brittle at low temperatures dues to metallurgical changes that occurred during high
temperature operation - ✔✔D
✔✔A pressure test used after maintenance work to assure that the equipment is leak
free:
a) Is called a leak test
b) Is called a tightness test
c) Is performed at a pressure based on the construction code formula
d) Is performed at a pressure based on the API 510 formula - ✔✔B
✔✔Who is responsible to ensure that all API 510 requirements of are met?
a) Authorized Inspector
b) Jurisdiction
c) Manufacturer
d) Owner/User
e) Pressure Vessel Engineer - ✔✔D
✔✔Who is responsible to ensure that the Authorized Inspection Agency functions in
accordance with the requirements of API 510?
a) Authorized Inspector
b) Jurisdiction
c) Owner/User
d) Pressure Vessel Engineer
e) Pressure Equipment Department Manager - ✔✔C
✔✔Each Owner/User that uses API 510 must:
a) Maintain a quality assurance inspection / repair management system
b) Employ (direct-hire) at least one pressure equipment engineer
c) Maintain an "R" stamp for vessel repairs
d) Employ (direct-hire) at least one qualified welder who can make repairs to pressure
vessels - ✔✔A
✔✔Which of the following is NOT required to be in the Onwer/User's quality assurance
inspection / repair management system?
a) Training requirements for inspection personnel
b) Calibration of NDE equipment
c) Directions on how to document inspection results
d) Specify approval process for calculation performed during vessel rerating
, e) Ensure all inspectors attend MSTS classes!!! - ✔✔E
✔✔Inspectors shall have an eye test every:
a) 3 months
b) 6 months
c) 12 months
d) 24 months - ✔✔C
✔✔What is the name of the Inspector's mandatory eye test?
a) Jaeger - with J-1 letters
b) Jaeger - withJ-2 letters
c) OAA - Level 2 letters
d) OAA - Level 6 letters - ✔✔A
✔✔Who is responsible for implementing an effective Management of Change process?
a) Authorized Inspection Agency
b) Jurisdiction
c) Owner / User
d) Pressure Equipment Engineer
e) Repair Organization - ✔✔C
✔✔A MOC system should be used to review and control changes made to:
a) The process
b) Hardware
c) Either the process or the hardware
d) The organizational structure of personnel involved in vessel integrity - ✔✔C
✔✔Who needs to be involved in the approval process for MOC's that affect pressure
vessel integrity?
a) Corrosion Specialist
b) Inspection Group
c) Jurisdiction
d) Pressure Equipment Engineer - ✔✔B
✔✔Who is responsible for implementing an effective program for establishing Integrity
Operating Windows (IOWs)?
a) Authorized Inspectors
b) Inspection Group
c) Owner / User
d) Pressure Equipment Engineer
e) Process Engineer - ✔✔C
✔✔Who should be made aware of deviations outside the OIWs?
a) Authorized Inspection Agency
