API 510 STUDY GUIDE QUESTIONS WITH COMPLETE
SOLUTIONS
A 0.500" thick carbon steel insert plate is added to the shell.
Preheating is used in lieu of a PWHT. The preheat temperature
must be maintained for a distance of:
a) 1" on each side of the weld
b) 2" on each side of the weld
c) 3" on each side of the weld
d) 4" on each side of the weld Correct Answers 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
Correct Answers A
A 2" thick carbon steel head is being replaced. Preheating is
performed in lieu of a PWHT. The preheat temperature must be
maintained for a distance of:
a) 1" on each side of the weld
b) 3" on each side of the weld
c) 4" on each side of the weld
d) 8" on each side of the weld Correct Answers D
A carbon steel vessel has a corroded area that will be repaired
with an insert patch. The vessel's nameplate is stamped with an
RT-1. The insert plate welds should be examined using:
,a) Spot RT
b) Full RT
c) MT or PT
d) Eddy Current Correct Answers B
A carbon steel vessel has a corroded area that will be repaired
with an insert patch. The vessel's nameplate is stamped with an
RT-3. The insert plate welds should be examined using:
a) Spot RT
b) Full RT
c) MT or PT
d) Eddy Current Correct Answers A
A carbon steel vessel has a corroded area that will be repaired
with an insert patch. The vessel's welds will be examined using
radiography. The acceptance criteria for these welds shall be in
accordance with:
a) API 510
b) ASME Section VIII or other applicable pressure vessel code
c) ASME Section IX or other applicable welding code
d) ASNT SNT-TC-A1 Correct Answers B
A CML is a spot for:
a) Checking for various damage types, (wall loss, cracking, or
HTHA)
b) Only taking UT thickness readings
c) Only taking UT or Profile RT thickness readings
d) Use in RBI assessments and is called Corrosion Monitored
Logic Correct Answers A
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" Correct Answers
D
A corroded area in a carbon steel vessel is being repaired by
using weld overlay (weld build-up). The vessel surface should
be examined by :
a) MT or PT before welding
b) MT or PT after welding
c) MT or PT both before and after welding
d) MT or PT after welding, and UT flaw detection after 24 hr
e) MT or PT both before & after welding, and UT flaw detection
after 24 hrs Correct Answers C
A corroded area in a vessel is 0.300" deep. The base metal
thickness near the corroded area is 0.750" thick. The area will be
repaired using weld build-up. The base metal is SA-516-70.
Determine the thickness of the weld repair if an E-6010
electrode is used to fill this corroded area.
a) 0.257"
b) 0.300"
c) 0.350"
d) 0.875" Correct Answers C
A corroded area is in the central portion of a 2:1 elliptical head.
When calculating the minimum required thickness, what "K
, Factor" should be used? (Note "K x D" is used to replace
"Radius" in the formula)
a) 0.50
b) 0.90
c) 1.00
d) 1.36 Correct Answers B
A corroded area is in the central portion of an elliptical head.
The minimum required thickness can be calculated using the
rating code's hemi-head formula and making some adjustments
to the Radius. API 510 defines the central portion of the head as
the center:
a) 50% of the head
b) 75% of the head
c) 80% of the head
d) 90% of the head Correct Answers C
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 Correct Answers C
A fillet weld patch is installed on a vessel that has a 144" inside
diameter. The wall thickness at the patch is 0.750". there is
another fillet weld patch nearby. What is the minimum allowed
spacing between these patches?
a) 25.5"
b) 29.4"
c) 36"
SOLUTIONS
A 0.500" thick carbon steel insert plate is added to the shell.
Preheating is used in lieu of a PWHT. The preheat temperature
must be maintained for a distance of:
a) 1" on each side of the weld
b) 2" on each side of the weld
c) 3" on each side of the weld
d) 4" on each side of the weld Correct Answers 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
Correct Answers A
A 2" thick carbon steel head is being replaced. Preheating is
performed in lieu of a PWHT. The preheat temperature must be
maintained for a distance of:
a) 1" on each side of the weld
b) 3" on each side of the weld
c) 4" on each side of the weld
d) 8" on each side of the weld Correct Answers D
A carbon steel vessel has a corroded area that will be repaired
with an insert patch. The vessel's nameplate is stamped with an
RT-1. The insert plate welds should be examined using:
,a) Spot RT
b) Full RT
c) MT or PT
d) Eddy Current Correct Answers B
A carbon steel vessel has a corroded area that will be repaired
with an insert patch. The vessel's nameplate is stamped with an
RT-3. The insert plate welds should be examined using:
a) Spot RT
b) Full RT
c) MT or PT
d) Eddy Current Correct Answers A
A carbon steel vessel has a corroded area that will be repaired
with an insert patch. The vessel's welds will be examined using
radiography. The acceptance criteria for these welds shall be in
accordance with:
a) API 510
b) ASME Section VIII or other applicable pressure vessel code
c) ASME Section IX or other applicable welding code
d) ASNT SNT-TC-A1 Correct Answers B
A CML is a spot for:
a) Checking for various damage types, (wall loss, cracking, or
HTHA)
b) Only taking UT thickness readings
c) Only taking UT or Profile RT thickness readings
d) Use in RBI assessments and is called Corrosion Monitored
Logic Correct Answers A
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" Correct Answers
D
A corroded area in a carbon steel vessel is being repaired by
using weld overlay (weld build-up). The vessel surface should
be examined by :
a) MT or PT before welding
b) MT or PT after welding
c) MT or PT both before and after welding
d) MT or PT after welding, and UT flaw detection after 24 hr
e) MT or PT both before & after welding, and UT flaw detection
after 24 hrs Correct Answers C
A corroded area in a vessel is 0.300" deep. The base metal
thickness near the corroded area is 0.750" thick. The area will be
repaired using weld build-up. The base metal is SA-516-70.
Determine the thickness of the weld repair if an E-6010
electrode is used to fill this corroded area.
a) 0.257"
b) 0.300"
c) 0.350"
d) 0.875" Correct Answers C
A corroded area is in the central portion of a 2:1 elliptical head.
When calculating the minimum required thickness, what "K
, Factor" should be used? (Note "K x D" is used to replace
"Radius" in the formula)
a) 0.50
b) 0.90
c) 1.00
d) 1.36 Correct Answers B
A corroded area is in the central portion of an elliptical head.
The minimum required thickness can be calculated using the
rating code's hemi-head formula and making some adjustments
to the Radius. API 510 defines the central portion of the head as
the center:
a) 50% of the head
b) 75% of the head
c) 80% of the head
d) 90% of the head Correct Answers C
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 Correct Answers C
A fillet weld patch is installed on a vessel that has a 144" inside
diameter. The wall thickness at the patch is 0.750". there is
another fillet weld patch nearby. What is the minimum allowed
spacing between these patches?
a) 25.5"
b) 29.4"
c) 36"
