API 510 Practice Test Questions
with All Correct Answers
A pressure vessel has been in non-continuous service for 15 years. During this time, it
has been filled three times for 2 years at a time, then internally inspected. The last
internal inspection determined that the vessel had 9 years remaining life. The next
inspection is due:
API 510 6.5.1.1 - Answer-Before 4.5 years of actual service.
Bulges and buckling in the metallic linings of pressure vessels normally indicate:
API 572 9.4.7 - Answer-That cracks or leaks exist in the bulged section of the lining or
that pin holes exist in the adjacent welds.
Any change to the design temperature, minimum allowable temperature (MAT), or
maximum allowable working pressure (MAWP), shall be considered:
API 510 3.1.42 - Answer-An alteration
After an alteration to a pressure vessel, a nondestructive examination (NDE) procedure
may be substituted for a pressure test only when:
API 510 5.8.8.1 - Answer-The engineer and inspector have approved.
A plant engineer would like to increase a vessel's operating temperature by 100˚F. The
vessel's nameplate states a maximum allowable working pressure of 250 psig at 650˚F,
and the current operating temperature is 600˚F. What is the first step in increasing the
operating temperature?
API 510 8.2.1 a/c - Answer-Perform calculations to determine if the vessel thickness is
sufficient.
Following the alteration of a 2 1/2 inch-thick vessel, a hydrostatic test is performed. To
minimize the risk of brittle fracture, metal temperature during hydrostatic tests should be
at least:
API 5.8.7.2 - Answer-30 °F (17 °C) above the MDMT or MAT
Substituting NDE procedures for a pressure test after major repair may be done only
after:
API 510 5.8.8.1 - Answer-The engineer and inspector have approved.
An example of vessels not covered by API 510 are:
API 510 1.1.1 - Answer-Vessels officially retired from service and abandoned in place.
with All Correct Answers
A pressure vessel has been in non-continuous service for 15 years. During this time, it
has been filled three times for 2 years at a time, then internally inspected. The last
internal inspection determined that the vessel had 9 years remaining life. The next
inspection is due:
API 510 6.5.1.1 - Answer-Before 4.5 years of actual service.
Bulges and buckling in the metallic linings of pressure vessels normally indicate:
API 572 9.4.7 - Answer-That cracks or leaks exist in the bulged section of the lining or
that pin holes exist in the adjacent welds.
Any change to the design temperature, minimum allowable temperature (MAT), or
maximum allowable working pressure (MAWP), shall be considered:
API 510 3.1.42 - Answer-An alteration
After an alteration to a pressure vessel, a nondestructive examination (NDE) procedure
may be substituted for a pressure test only when:
API 510 5.8.8.1 - Answer-The engineer and inspector have approved.
A plant engineer would like to increase a vessel's operating temperature by 100˚F. The
vessel's nameplate states a maximum allowable working pressure of 250 psig at 650˚F,
and the current operating temperature is 600˚F. What is the first step in increasing the
operating temperature?
API 510 8.2.1 a/c - Answer-Perform calculations to determine if the vessel thickness is
sufficient.
Following the alteration of a 2 1/2 inch-thick vessel, a hydrostatic test is performed. To
minimize the risk of brittle fracture, metal temperature during hydrostatic tests should be
at least:
API 5.8.7.2 - Answer-30 °F (17 °C) above the MDMT or MAT
Substituting NDE procedures for a pressure test after major repair may be done only
after:
API 510 5.8.8.1 - Answer-The engineer and inspector have approved.
An example of vessels not covered by API 510 are:
API 510 1.1.1 - Answer-Vessels officially retired from service and abandoned in place.
