MARK'S API 510 EXAMS SCRIPT 2026/2027 QUESTIONS
AND SOLUTIONS RATED A+
✔✔Who is responsible for responding to inspection results that require corrective
action?
a) Engineer
b) Maintenance Department
c) Owner / User
d) Pressure Equipment Specialist - ✔✔C
✔✔An in-service vessel is being repaired or altered. If there is a conflict between the
requirements of API 510 and the legal jurisdiction, which should be followed?
a) API 510
b) The Legal Jurisdiction
c) The one with the most stringent requirements.
d) Either set of the requirements based on Engineer and AI approval - ✔✔C
✔✔An in-service vessel is inspected. If there is a conflict between API 510 and the legal
jurisdiction, which should be followed?
a) API 510
b) The Legal Jurisdiction
c) The one with the most stringent requirements
d) Either set of the requirements based on Engineer and AI approval - ✔✔C
✔✔Which of the following vessels, that may be exempted from API 510, should be
considered for inclusion in the Owner/User's API 510 program?
a) 140' Low Pressure Storage Tank
b) Oil Mist Accumulator
c) Small Filter
d) Vacuum Flasher - ✔✔D
✔✔Which code is used for Fitness for Service evaluations?
a) API 579
b) API 660
c) API 2201
d) ASME B&PV Section V - ✔✔A
✔✔Which code is used for RBI assessments?
a) API 573
b) API 579
c) API 580
d) API 2201 - ✔✔C
,✔✔During an in-service internal inspection, a crack is discovered on a longitudinal weld.
This crack can be evaluated to which industry document?
a) API 510
b) API 579
c) ASME B&PV Section VI
d) Cracks are never allowed in an in-service vessel. - ✔✔B
✔✔Which document provides requirements for Hot Tapping?
a) API 578
b) API 579
c) API 651
d) API 2201
e) API 2217 - ✔✔D
✔✔Which document provides information on Damage Mechanisms in the Refining
Industry?
a) API 570
b) API 571.
c) API 577
d) ASME Section V
e) ASME Section XI - ✔✔B
✔✔Which document provides information on Corrosion Under Insulation and
Fireproofing?
a) API 571
b) API 581
c) API 583.
d) ASME B16.5
e) NACE SP1488 - ✔✔C
✔✔Which document provides information on repair of Pressure Equipment & Piping?
a) API 581
b) API 584
c) API 598
d) ASME PCC-2 - ✔✔D
✔✔Which document provides information on Integrity Operating Windows?
a) API 584
b) API 585
c) API 2201
d) ASME PCC-1
e) ASME Section III - ✔✔A
✔✔Which document provides information on Material Identification of Alloy Materials?
,a) API 578
b) API 584
c) API 598
d) ASME PCC-1
e) NACE SP0170 - ✔✔A
✔✔Which document provides information on protecting Austenitic Alloys from
Polythionic Acid Stress Corrosion Cracking?
a) API 583
b) API 584
c) NACE SPO170
d) WRC Bulletin 412 - ✔✔C
✔✔When performing controlled deposition welding, supporting technical information can
be found in:
a) API 1104
b) API 2201
c) ASME Section VIII
d) WRC Bulletin 412 - ✔✔D
✔✔Which of the following is considered a vessel alteration?
a) Addition of non-reinforced nozzle
b) Weld build-up in a locally corroded area
c) Replacement of a hemi-spherical head with a tori - spherical head
d) Addition of fillet weld patch - ✔✔C
✔✔An alteration on a vessel is defined as:
a) A 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 vessel's pressure boundary - ✔✔A
✔✔An 8 NPS nozzle is going to be added to a 2-to-1 ellipsoidal vessel head. The vessel
is rated for 350 psig at 500°F. the vessel has inside diameter of 72". The largest existing
nozzle on the vessel is 18 NPS. Which of the following is true?
a) This work will be considered an alteration
b) The root pass on the welds must be checked with either MT or PT
c) The vessel must be hydrotested after the nozzles are completed
d) This must be authorized by the Inspector and approved by the Engineer. - ✔✔D
✔✔A 14 NPS nozzle is going to be added to a vessel shell. The vessel is rated for 100
psig at 650°F and has an existing 10 NPS nozzle. Which of the following is true?
a) This work is considered an alteration
b) This work is considered a repair
c) The shell-to-nozzle weld must be radiographed
, d) This work must be authorized only by the API 510 Inspector - ✔✔A
✔✔Which of the following inspection organization is NOT considered an acceptable API
510 Authorized Inspection Agency?
a) Holder of an appropriate ASME Code Symbol
b) Insurance company that writes pressure vessel insurance
c) The Owner / User
d) The Jurisdiction - ✔✔A
✔✔Which of the following is considered an API 510 Authorized Inspection Agency?
a) The Owner/User's operating department
b) The inspection organization of the Jurisdiction
c) And NDE contract organization
d) The inspection department of a vessel manufacturer - ✔✔B
✔✔A CML is:
a) Only used for UT thickness readings
b) Always a small spot on the equipment (no larger than 3" diameter)
c) Considered a plane through a nozzle section
d) Either a small spot on the vessel / nozzle or a plane through a nozzle section
e) Defined as "Corroded Measured Length" - ✔✔D
✔✔Fatigue damage comes from:
a) Cyclic loadings
b) The combination of time, temperature and stress.
c) The combination of susceptible material, conducive environment and stress.
d) High temperature excursions
e) One month of twelve hour days without a day off! - ✔✔A
✔✔Which of the following does not contribute to fatigue damage?
a) Cyclic mechanical loadings
b) Cyclic platform loadings
c) Cyclic pressure loadings
d) Cyclic temperature loadings - ✔✔B
✔✔A defect is an:
a) Imperfection
b) Imperfection that does not exceed the acceptance criteria.
c) Imperfection that does exceed the acceptance criteria
d) Imperfection that does exceed the acceptance criteria and must always be repaired -
✔✔C
✔✔What is the maximum diameter of an examination point?
a) 1"
AND SOLUTIONS RATED A+
✔✔Who is responsible for responding to inspection results that require corrective
action?
a) Engineer
b) Maintenance Department
c) Owner / User
d) Pressure Equipment Specialist - ✔✔C
✔✔An in-service vessel is being repaired or altered. If there is a conflict between the
requirements of API 510 and the legal jurisdiction, which should be followed?
a) API 510
b) The Legal Jurisdiction
c) The one with the most stringent requirements.
d) Either set of the requirements based on Engineer and AI approval - ✔✔C
✔✔An in-service vessel is inspected. If there is a conflict between API 510 and the legal
jurisdiction, which should be followed?
a) API 510
b) The Legal Jurisdiction
c) The one with the most stringent requirements
d) Either set of the requirements based on Engineer and AI approval - ✔✔C
✔✔Which of the following vessels, that may be exempted from API 510, should be
considered for inclusion in the Owner/User's API 510 program?
a) 140' Low Pressure Storage Tank
b) Oil Mist Accumulator
c) Small Filter
d) Vacuum Flasher - ✔✔D
✔✔Which code is used for Fitness for Service evaluations?
a) API 579
b) API 660
c) API 2201
d) ASME B&PV Section V - ✔✔A
✔✔Which code is used for RBI assessments?
a) API 573
b) API 579
c) API 580
d) API 2201 - ✔✔C
,✔✔During an in-service internal inspection, a crack is discovered on a longitudinal weld.
This crack can be evaluated to which industry document?
a) API 510
b) API 579
c) ASME B&PV Section VI
d) Cracks are never allowed in an in-service vessel. - ✔✔B
✔✔Which document provides requirements for Hot Tapping?
a) API 578
b) API 579
c) API 651
d) API 2201
e) API 2217 - ✔✔D
✔✔Which document provides information on Damage Mechanisms in the Refining
Industry?
a) API 570
b) API 571.
c) API 577
d) ASME Section V
e) ASME Section XI - ✔✔B
✔✔Which document provides information on Corrosion Under Insulation and
Fireproofing?
a) API 571
b) API 581
c) API 583.
d) ASME B16.5
e) NACE SP1488 - ✔✔C
✔✔Which document provides information on repair of Pressure Equipment & Piping?
a) API 581
b) API 584
c) API 598
d) ASME PCC-2 - ✔✔D
✔✔Which document provides information on Integrity Operating Windows?
a) API 584
b) API 585
c) API 2201
d) ASME PCC-1
e) ASME Section III - ✔✔A
✔✔Which document provides information on Material Identification of Alloy Materials?
,a) API 578
b) API 584
c) API 598
d) ASME PCC-1
e) NACE SP0170 - ✔✔A
✔✔Which document provides information on protecting Austenitic Alloys from
Polythionic Acid Stress Corrosion Cracking?
a) API 583
b) API 584
c) NACE SPO170
d) WRC Bulletin 412 - ✔✔C
✔✔When performing controlled deposition welding, supporting technical information can
be found in:
a) API 1104
b) API 2201
c) ASME Section VIII
d) WRC Bulletin 412 - ✔✔D
✔✔Which of the following is considered a vessel alteration?
a) Addition of non-reinforced nozzle
b) Weld build-up in a locally corroded area
c) Replacement of a hemi-spherical head with a tori - spherical head
d) Addition of fillet weld patch - ✔✔C
✔✔An alteration on a vessel is defined as:
a) A 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 vessel's pressure boundary - ✔✔A
✔✔An 8 NPS nozzle is going to be added to a 2-to-1 ellipsoidal vessel head. The vessel
is rated for 350 psig at 500°F. the vessel has inside diameter of 72". The largest existing
nozzle on the vessel is 18 NPS. Which of the following is true?
a) This work will be considered an alteration
b) The root pass on the welds must be checked with either MT or PT
c) The vessel must be hydrotested after the nozzles are completed
d) This must be authorized by the Inspector and approved by the Engineer. - ✔✔D
✔✔A 14 NPS nozzle is going to be added to a vessel shell. The vessel is rated for 100
psig at 650°F and has an existing 10 NPS nozzle. Which of the following is true?
a) This work is considered an alteration
b) This work is considered a repair
c) The shell-to-nozzle weld must be radiographed
, d) This work must be authorized only by the API 510 Inspector - ✔✔A
✔✔Which of the following inspection organization is NOT considered an acceptable API
510 Authorized Inspection Agency?
a) Holder of an appropriate ASME Code Symbol
b) Insurance company that writes pressure vessel insurance
c) The Owner / User
d) The Jurisdiction - ✔✔A
✔✔Which of the following is considered an API 510 Authorized Inspection Agency?
a) The Owner/User's operating department
b) The inspection organization of the Jurisdiction
c) And NDE contract organization
d) The inspection department of a vessel manufacturer - ✔✔B
✔✔A CML is:
a) Only used for UT thickness readings
b) Always a small spot on the equipment (no larger than 3" diameter)
c) Considered a plane through a nozzle section
d) Either a small spot on the vessel / nozzle or a plane through a nozzle section
e) Defined as "Corroded Measured Length" - ✔✔D
✔✔Fatigue damage comes from:
a) Cyclic loadings
b) The combination of time, temperature and stress.
c) The combination of susceptible material, conducive environment and stress.
d) High temperature excursions
e) One month of twelve hour days without a day off! - ✔✔A
✔✔Which of the following does not contribute to fatigue damage?
a) Cyclic mechanical loadings
b) Cyclic platform loadings
c) Cyclic pressure loadings
d) Cyclic temperature loadings - ✔✔B
✔✔A defect is an:
a) Imperfection
b) Imperfection that does not exceed the acceptance criteria.
c) Imperfection that does exceed the acceptance criteria
d) Imperfection that does exceed the acceptance criteria and must always be repaired -
✔✔C
✔✔What is the maximum diameter of an examination point?
a) 1"
