API 510 Closed Book Final Exam Questions
and Correct Answers
Question 1
Calculate the remaining life and external insp. interval of a vessel given the following
data:
Actual thickness = 0.955 inch
Minimum thickness required = 0.755 inch
Thickness at previous inspection 5 years prior to present inspection = 1.025 inch
a. 20 years, 10 years
b. 14 years, 5years
c. 28 years, 10 years
d. None of the above
Correct Answer
14 years, 5years
Question 2
Post weld heat treatment of vessel welds generally results in:
a. Improvement in ductility
b. Increase of tensile strength
c. Increase of strength and ductility
d. None of the above
Correct Answer
Improvement in ductility
Page 1 of 462
,Question 3
For a vertical column, Int. dia. = 48'' and height (T-T) = 80ft, The vessel MAWP is 60
psi. The vessel part MAWP for bottom dished head (2:1 Ellip type) will be:
a. 94.6 psi
b. 82.8 psi
c. 95.5 psi
d. None of above
Correct Answer
95.5 psi
Question 4
In planning for an internal inspection of a vertical vessel that has acidic corrodents,
what type of corrosion would you expect to find on the vessel shell from inside?
a. Hydrogen blistering near liquid level
b. Hydrogen blistering on top dished head
c. Hydrogen blistering near the bottom of vessel
d. None of above
Correct Answer
Hydrogen blistering near liquid level
Question 5
Which is/are advantage of magnetic particle testing over penetrant testing?
a. It can detect surface discontinuities with foreign material imbedded in them.
b. It is faster on individual parts.
c. It can detect near-surface discontinuities.
d. All of the above.
Correct Answer
All of the above.
Page 2 of 462
,Question 6
A vessel which was inspected six years ago and had shell thickness = 0.870". As on
today the thickness as reported by filed inspection is 0.786. What was the corrosion
rate over last six years?
a. 10 mpy
b. 12 mpy
c. 14 mpy
d. none of above
Correct Answer
14 mpy
Question 7
For vessels which are supported on concrete saddles and working in an area where
the humidity is high which areas on them are typically susceptible to external
corrosion?
a. At the anchor bolts in the foundation
b. At the Points of contact of the metal surface with the concrete
c. All of the above
d. None of the above
Correct Answer
At the Points of contact of the metal surface with the concrete
Question 8
A certain C.S. vessel which required impact testing was required to have PWHT initially
according to code requirement. After 10 years when repaired by welding PWHT is to
be carried out. Performing PWHT is found to be impracticable. Which of the following
is relevant (as per API-510)?
a. PWHT may be exempted, if proper NDE is carried out.
b. Carry out temper-bead welding as alternative to PWHT.
c. Carry out both hydro-testing and pneumatic testing in lieu of the PWHT.
d. Carry out preheating to minimum 200°F
Correct Answer
Carry out temper-bead welding as alternative to PWHT.
Page 3 of 462
, Question 9
If any setting is noticed on a vessel, which of the following should be done:
a. Conduct RT after 48 hours of observing the defective condition
b. Nozzles and adjacent shell areas should be inspected for distortion and cracking
c. Use acoustic emission monitoring
d. All of the above
Correct Answer
Nozzles and adjacent shell areas should be inspected for distortion and cracking
Question 10
Temper embrittlement is:
a. Brittleness due to low temperature operation
b. Brittleness due to Hydrogen Sulphide attack at high temperatures (exceeding
700°F)
c. Loss of ductility in Cr-steels due to incorrect PWHT and High temperature service
d. None of above
Correct Answer
Loss of ductility in Cr-steels due to incorrect PWHT and High temperature service
Question 11
Minimum Design thickness for a vessel shell is 10 mm. Following four plates were
received with actual thickness equal to: 10.2 mm, 9.7mm, 10.3mm, and 9.6 mm. As per
ASME Sec. VIII Div.1, how many plates will you release for vessel fabrication?
a. 1
b. 2
c. 3
d. All 4
Correct Answer
3
Page 4 of 462
and Correct Answers
Question 1
Calculate the remaining life and external insp. interval of a vessel given the following
data:
Actual thickness = 0.955 inch
Minimum thickness required = 0.755 inch
Thickness at previous inspection 5 years prior to present inspection = 1.025 inch
a. 20 years, 10 years
b. 14 years, 5years
c. 28 years, 10 years
d. None of the above
Correct Answer
14 years, 5years
Question 2
Post weld heat treatment of vessel welds generally results in:
a. Improvement in ductility
b. Increase of tensile strength
c. Increase of strength and ductility
d. None of the above
Correct Answer
Improvement in ductility
Page 1 of 462
,Question 3
For a vertical column, Int. dia. = 48'' and height (T-T) = 80ft, The vessel MAWP is 60
psi. The vessel part MAWP for bottom dished head (2:1 Ellip type) will be:
a. 94.6 psi
b. 82.8 psi
c. 95.5 psi
d. None of above
Correct Answer
95.5 psi
Question 4
In planning for an internal inspection of a vertical vessel that has acidic corrodents,
what type of corrosion would you expect to find on the vessel shell from inside?
a. Hydrogen blistering near liquid level
b. Hydrogen blistering on top dished head
c. Hydrogen blistering near the bottom of vessel
d. None of above
Correct Answer
Hydrogen blistering near liquid level
Question 5
Which is/are advantage of magnetic particle testing over penetrant testing?
a. It can detect surface discontinuities with foreign material imbedded in them.
b. It is faster on individual parts.
c. It can detect near-surface discontinuities.
d. All of the above.
Correct Answer
All of the above.
Page 2 of 462
,Question 6
A vessel which was inspected six years ago and had shell thickness = 0.870". As on
today the thickness as reported by filed inspection is 0.786. What was the corrosion
rate over last six years?
a. 10 mpy
b. 12 mpy
c. 14 mpy
d. none of above
Correct Answer
14 mpy
Question 7
For vessels which are supported on concrete saddles and working in an area where
the humidity is high which areas on them are typically susceptible to external
corrosion?
a. At the anchor bolts in the foundation
b. At the Points of contact of the metal surface with the concrete
c. All of the above
d. None of the above
Correct Answer
At the Points of contact of the metal surface with the concrete
Question 8
A certain C.S. vessel which required impact testing was required to have PWHT initially
according to code requirement. After 10 years when repaired by welding PWHT is to
be carried out. Performing PWHT is found to be impracticable. Which of the following
is relevant (as per API-510)?
a. PWHT may be exempted, if proper NDE is carried out.
b. Carry out temper-bead welding as alternative to PWHT.
c. Carry out both hydro-testing and pneumatic testing in lieu of the PWHT.
d. Carry out preheating to minimum 200°F
Correct Answer
Carry out temper-bead welding as alternative to PWHT.
Page 3 of 462
, Question 9
If any setting is noticed on a vessel, which of the following should be done:
a. Conduct RT after 48 hours of observing the defective condition
b. Nozzles and adjacent shell areas should be inspected for distortion and cracking
c. Use acoustic emission monitoring
d. All of the above
Correct Answer
Nozzles and adjacent shell areas should be inspected for distortion and cracking
Question 10
Temper embrittlement is:
a. Brittleness due to low temperature operation
b. Brittleness due to Hydrogen Sulphide attack at high temperatures (exceeding
700°F)
c. Loss of ductility in Cr-steels due to incorrect PWHT and High temperature service
d. None of above
Correct Answer
Loss of ductility in Cr-steels due to incorrect PWHT and High temperature service
Question 11
Minimum Design thickness for a vessel shell is 10 mm. Following four plates were
received with actual thickness equal to: 10.2 mm, 9.7mm, 10.3mm, and 9.6 mm. As per
ASME Sec. VIII Div.1, how many plates will you release for vessel fabrication?
a. 1
b. 2
c. 3
d. All 4
Correct Answer
3
Page 4 of 462
