Open Book API 510 Practice Exam A Questions Correctly
Answered 2024/25
A vessel is to under go a hydrostatic test after a repair. The vessel's stress allowable at the test
temperature is 15,000 psi and its stress allowable at its operating temperature is 13,800 psi. The vessel's
MAWP at its design temperature is 125 psi. What will be the required test pressure at the top of the
vessel?
A vessel is to under go a hydrostatic test after a repair. The vessel's stress allowable at the test
temperature is 15,000 psi and its stress allowable at its operating temperature is 13,800 psi. The vessel's
MAWP at its design temperature is 125 psi. What will be the required test pressure at the top of the
vessel? - Correct Answer 176.6 psi
A cylindrical shell contains a welded long joint that is made using a backing strip that remains in place.
All of the radiography requirements of UW 12 (a) have been met. For purposes of calculating
circumferential stress on the cylinder, what will be the value of the joint E used in the calculation? -
Correct Answer .90
A small exchanger has experienced internal corrosion of its tubes. The tubes are required to withstand
an external pressure of 350 psi. The tubes have and O. D. of 2.0 inch and are 60 inches in length with a
wall thickness of .025 inch. What would be the approximate Factor A value for this combination of length
diameter and thickness of tube is? - Correct Answer .00055
An additional 4 inch nozzle was added to a pressure vessel and is similar to the one in Fig UW-l6.1(i). The
minimum thickness of the nozzle is .377 inch and the shell minimum thickness is .750 inch. What is the
decimal value of the minimum throat required for each of two equal leg size fillet welds on this
attachment? - Correct Answer .250'
A cylindrical shell has a seamless hemispherical head on one end and a seamless ellipsoidal head on the
other end. The elliptical head is attached by a type 2 weld meeting the spot radiography requirements of
UW-11(a)(5)(b). The shell has a single longitudinal joint. All category A butt welds are type 1 with full
radiography applied. The vessel will require an MAWP of 50 psi . The material of the shell and head is SA-
515-Gr. 60. The allowable stress at the operating temperature is 15,000 psi. The heads inside diameter is
10'-0". What is the required thickness of the 2 to 1 ellipsoidal head? - Correct Answer .200
, You have received the following tension test results for a welding procedure, what is the ultimate unit
stress for these two specimens?
Specimen | Width | Thickness
1 | .750 | .410
2 | .748 | .409
Area | Ultimate Total Load lb | Ultimate Unit Stress
.308 | 22,600 | ?
.306 | 25,800 | ? - Correct Answer 1 = 73,377 2 = 84,314
An engineer is evaluating a pressure vessel's head for impact testing requirements based on an MDMT to
be marked on the vessel of 40°F. As part of the calculations required it has been determined that this
head will have a coincident ratio of 0.60, this will allow a further reduction of the MDMT exemption
given by figure UCS-66 of___°F. - Correct Answer 40
(WPS) In the JOINTS (QW-402) section, the following statement is true; - Correct Answer The box is
properly addressed and contains no mistakes.
(WPS) In the BASE METAL (QW-403) there is a mistake because the; - Correct Answer There is no
mistake; none of the above is true, 1 & 3 are for information only, number 2 is not needed for this
procedure because no impact tests are required of the weldment.
(WPS) In the TECHNIQUE (QW-410) should have addressed the following; - Correct Answer Method of
back gouging.
Which types of butt-welded joints are allowed to be used to construct vessels in lethal service? - Correct
Answer 1 and 2 dependent upon Category.
After rolling a plate into a cylinder designed for internal pressure it is measured for out of roundness; -
Correct Answer It is acceptable if it is no more than 1% out of roundness.
Answered 2024/25
A vessel is to under go a hydrostatic test after a repair. The vessel's stress allowable at the test
temperature is 15,000 psi and its stress allowable at its operating temperature is 13,800 psi. The vessel's
MAWP at its design temperature is 125 psi. What will be the required test pressure at the top of the
vessel?
A vessel is to under go a hydrostatic test after a repair. The vessel's stress allowable at the test
temperature is 15,000 psi and its stress allowable at its operating temperature is 13,800 psi. The vessel's
MAWP at its design temperature is 125 psi. What will be the required test pressure at the top of the
vessel? - Correct Answer 176.6 psi
A cylindrical shell contains a welded long joint that is made using a backing strip that remains in place.
All of the radiography requirements of UW 12 (a) have been met. For purposes of calculating
circumferential stress on the cylinder, what will be the value of the joint E used in the calculation? -
Correct Answer .90
A small exchanger has experienced internal corrosion of its tubes. The tubes are required to withstand
an external pressure of 350 psi. The tubes have and O. D. of 2.0 inch and are 60 inches in length with a
wall thickness of .025 inch. What would be the approximate Factor A value for this combination of length
diameter and thickness of tube is? - Correct Answer .00055
An additional 4 inch nozzle was added to a pressure vessel and is similar to the one in Fig UW-l6.1(i). The
minimum thickness of the nozzle is .377 inch and the shell minimum thickness is .750 inch. What is the
decimal value of the minimum throat required for each of two equal leg size fillet welds on this
attachment? - Correct Answer .250'
A cylindrical shell has a seamless hemispherical head on one end and a seamless ellipsoidal head on the
other end. The elliptical head is attached by a type 2 weld meeting the spot radiography requirements of
UW-11(a)(5)(b). The shell has a single longitudinal joint. All category A butt welds are type 1 with full
radiography applied. The vessel will require an MAWP of 50 psi . The material of the shell and head is SA-
515-Gr. 60. The allowable stress at the operating temperature is 15,000 psi. The heads inside diameter is
10'-0". What is the required thickness of the 2 to 1 ellipsoidal head? - Correct Answer .200
, You have received the following tension test results for a welding procedure, what is the ultimate unit
stress for these two specimens?
Specimen | Width | Thickness
1 | .750 | .410
2 | .748 | .409
Area | Ultimate Total Load lb | Ultimate Unit Stress
.308 | 22,600 | ?
.306 | 25,800 | ? - Correct Answer 1 = 73,377 2 = 84,314
An engineer is evaluating a pressure vessel's head for impact testing requirements based on an MDMT to
be marked on the vessel of 40°F. As part of the calculations required it has been determined that this
head will have a coincident ratio of 0.60, this will allow a further reduction of the MDMT exemption
given by figure UCS-66 of___°F. - Correct Answer 40
(WPS) In the JOINTS (QW-402) section, the following statement is true; - Correct Answer The box is
properly addressed and contains no mistakes.
(WPS) In the BASE METAL (QW-403) there is a mistake because the; - Correct Answer There is no
mistake; none of the above is true, 1 & 3 are for information only, number 2 is not needed for this
procedure because no impact tests are required of the weldment.
(WPS) In the TECHNIQUE (QW-410) should have addressed the following; - Correct Answer Method of
back gouging.
Which types of butt-welded joints are allowed to be used to construct vessels in lethal service? - Correct
Answer 1 and 2 dependent upon Category.
After rolling a plate into a cylinder designed for internal pressure it is measured for out of roundness; -
Correct Answer It is acceptable if it is no more than 1% out of roundness.
