API 510 STUDY GUIDE EXAM 2026/2027 QUESTIONS AND
SOLUTIONS RATED A+
✔✔The major factor for determining the degree of surface preparation required for an
internal visual inspection is - ✔✔The type and location of the deterioration expected
✔✔Which of the following heads will normally require the greatest wall thickness for the
same design conditions - ✔✔Flat head
✔✔Acceptance criteria for welded repairs should include NDE techniques that are in
accordance with - ✔✔ASME
✔✔A pressure test for pressure vessels is applied at the discretion of the API
authorized inspector, but is normally required after a - ✔✔Alteration
✔✔Lap joint flanges should be checked for - ✔✔Corrosion between the flange and pipe
✔✔Inspection records should be maintained - ✔✔For the service life of the vessel
✔✔A pilot operated safety relief valve is best suited when the - ✔✔Operating pressure
is close to the set pressure
✔✔Which of the following nondestructive examination methods is most likely to detect a
subsurface flaw in a pressure vessel - ✔✔Ultrasonic
✔✔The potential for galvanic corrosion will increase when - ✔✔Combining metals from
opposite ends of the galvanic series
✔✔A low energy value on a test for notch toughness indicates that a metal is - ✔✔Brittle
✔✔The ability of a metal to absorb energy and deform plastically before fracturing is
known as - ✔✔Toughness
✔✔What type of failure causes transgranular or dagger shaped cracks - ✔✔Thermal
fatigue
✔✔What causes alloy steels to lose toughness - ✔✔Temper embrittlement
✔✔What type of welding process can a welder not be qualified by using RT - ✔✔SAW
✔✔An underground vessel has been idled for a very long time. What type of inspection
should be performed - ✔✔External
, ✔✔What are the critical factors for boiler water corrosion - ✔✔Ph and quality of feed
water
✔✔The purpose of reviewing the welder performance qualification (WPQ) is to -
✔✔Verify that welder are qualified to perform the welding given its position and process
✔✔What is the minimum permitted overlap when it is necessary to PWHT a vessel in
more than one heat due to length - ✔✔5 feet
✔✔Describe the correct way to clean a vessel for inspection - ✔✔Wire brushing,
blasting, chipping, grinding
✔✔What is the most valuable method of vessel for inspection - ✔✔Careful visual
examination
✔✔In terms of creep, what must be considered - ✔✔Time, temperature, stress
✔✔Under what circumstances must an API 510 inspector be re-certified - ✔✔Inspector
who has not been actively engaged in an API inspection within the previous 3 years.
Re-certify by written examination
✔✔What is pressure vessel - ✔✔A container designed to withstand internal or external
pressure by an exterior source by the application of heat direct or indirect or both
✔✔Define Rerating - ✔✔A change in either temperature rating or maximum allowable
pressure of a vessel or both
✔✔Define MAWP according to the API 510 Code - ✔✔Is the maximum gauge pressure
permitted at the top of a vessel in its operating position for a designated temperature
✔✔What code covers maintenance inspection of petrochemical industry vessels -
✔✔API-510
✔✔What metals might be subject to brittle fracture even at room temperature - ✔✔At
ambient temperature, carbon, low
✔✔ - ✔✔
✔✔ NDE examinations must be scheduled at intervals that consider the - ✔✔Probability
of the NDE method to identify the damage
✔✔What is the transition temperature of a metal? - ✔✔The temp at which the material
fracture code changes from ductile to brittle
SOLUTIONS RATED A+
✔✔The major factor for determining the degree of surface preparation required for an
internal visual inspection is - ✔✔The type and location of the deterioration expected
✔✔Which of the following heads will normally require the greatest wall thickness for the
same design conditions - ✔✔Flat head
✔✔Acceptance criteria for welded repairs should include NDE techniques that are in
accordance with - ✔✔ASME
✔✔A pressure test for pressure vessels is applied at the discretion of the API
authorized inspector, but is normally required after a - ✔✔Alteration
✔✔Lap joint flanges should be checked for - ✔✔Corrosion between the flange and pipe
✔✔Inspection records should be maintained - ✔✔For the service life of the vessel
✔✔A pilot operated safety relief valve is best suited when the - ✔✔Operating pressure
is close to the set pressure
✔✔Which of the following nondestructive examination methods is most likely to detect a
subsurface flaw in a pressure vessel - ✔✔Ultrasonic
✔✔The potential for galvanic corrosion will increase when - ✔✔Combining metals from
opposite ends of the galvanic series
✔✔A low energy value on a test for notch toughness indicates that a metal is - ✔✔Brittle
✔✔The ability of a metal to absorb energy and deform plastically before fracturing is
known as - ✔✔Toughness
✔✔What type of failure causes transgranular or dagger shaped cracks - ✔✔Thermal
fatigue
✔✔What causes alloy steels to lose toughness - ✔✔Temper embrittlement
✔✔What type of welding process can a welder not be qualified by using RT - ✔✔SAW
✔✔An underground vessel has been idled for a very long time. What type of inspection
should be performed - ✔✔External
, ✔✔What are the critical factors for boiler water corrosion - ✔✔Ph and quality of feed
water
✔✔The purpose of reviewing the welder performance qualification (WPQ) is to -
✔✔Verify that welder are qualified to perform the welding given its position and process
✔✔What is the minimum permitted overlap when it is necessary to PWHT a vessel in
more than one heat due to length - ✔✔5 feet
✔✔Describe the correct way to clean a vessel for inspection - ✔✔Wire brushing,
blasting, chipping, grinding
✔✔What is the most valuable method of vessel for inspection - ✔✔Careful visual
examination
✔✔In terms of creep, what must be considered - ✔✔Time, temperature, stress
✔✔Under what circumstances must an API 510 inspector be re-certified - ✔✔Inspector
who has not been actively engaged in an API inspection within the previous 3 years.
Re-certify by written examination
✔✔What is pressure vessel - ✔✔A container designed to withstand internal or external
pressure by an exterior source by the application of heat direct or indirect or both
✔✔Define Rerating - ✔✔A change in either temperature rating or maximum allowable
pressure of a vessel or both
✔✔Define MAWP according to the API 510 Code - ✔✔Is the maximum gauge pressure
permitted at the top of a vessel in its operating position for a designated temperature
✔✔What code covers maintenance inspection of petrochemical industry vessels -
✔✔API-510
✔✔What metals might be subject to brittle fracture even at room temperature - ✔✔At
ambient temperature, carbon, low
✔✔ - ✔✔
✔✔ NDE examinations must be scheduled at intervals that consider the - ✔✔Probability
of the NDE method to identify the damage
✔✔What is the transition temperature of a metal? - ✔✔The temp at which the material
fracture code changes from ductile to brittle
