API 510 practice exams (Closed Book Final Exam)
Questions With Complete Solutions
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.
A cylindrical shell with thickness = 4.0", ID=96", S=17100 and
E=0.85 and C.A. = 1/8" showed metal loss of 1/4" in areas 8" on
either side of the longitudinal welds. You analysis of situation
is:
a. Recalculate shell thickness 't'minimum considering E=1.0
b. The thinned area is on or within weld area hence (a) above
can not be adopted
c. Prepare repair procedure and restore the metal loss as per API
-510
d. b and c above Correct Answer b and c above
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
After an inspection interval is completed and if calculations
indicate that an inaccurate rate of corrosion has been assumed
initially, how do you determine the corrosion rate for the next
inspection period?
a. Check the original calculations to find out what the error is in
the original assumption.
b. Unless the corrosion rate is changed by Jurisdiction, the initial
rates shall be used.
c. The corrosion rate shall be adjusted to agree with the actual
rate found.
d. Call in a corrosion specialist Correct Answer The corrosion
rate shall be adjusted to agree with the actual rate found.
An ellipsoidal head has an internal diameter of 76 inches and
depth of 21 inches (including a straight face dimension of 2
inches). What should its spherical (crown) radius be?
a. 76.9 inches
b. 15.6 inches
c. 68.4 inches
d. All of the above Correct Answer 68.4 inches
, An RBI assessment can be used to alter the inspection strategy
provided:
a. The degradation methods are identified and evaluated
b. The RBI is fully documented.
c. A third party conducts the RBI
d. Both A and B above Correct Answer Both A and B above
API 576 does not address:
a. Valve testing on test benches in shop
b. Application of rupture discs
c. Training requirements for mechanics involved in inspection
and repair of pressure relieving devices
d. All of the above Correct Answer Training requirements for
mechanics involved in inspection and repair of pressure
relieving devices
As per ASME Sec. VIII Div. 1, if permanent deformation is
observed due to over pressure during hydrotesting:
a. The inspector should ask for re-test using proper test pressure
and new pressure gauges.
b. Follow-up the hydro-testing by a pneumatic test at proper
pressure, taking suitable precautions as given in code
c. The inspector may ask for providing additional stiffening
rings around vessel and carry out re-hydro test at proper test
pressure.
d. The inspector may reject the vessel. Correct Answer The
inspector may reject the vessel.
Questions With Complete Solutions
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.
A cylindrical shell with thickness = 4.0", ID=96", S=17100 and
E=0.85 and C.A. = 1/8" showed metal loss of 1/4" in areas 8" on
either side of the longitudinal welds. You analysis of situation
is:
a. Recalculate shell thickness 't'minimum considering E=1.0
b. The thinned area is on or within weld area hence (a) above
can not be adopted
c. Prepare repair procedure and restore the metal loss as per API
-510
d. b and c above Correct Answer b and c above
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
After an inspection interval is completed and if calculations
indicate that an inaccurate rate of corrosion has been assumed
initially, how do you determine the corrosion rate for the next
inspection period?
a. Check the original calculations to find out what the error is in
the original assumption.
b. Unless the corrosion rate is changed by Jurisdiction, the initial
rates shall be used.
c. The corrosion rate shall be adjusted to agree with the actual
rate found.
d. Call in a corrosion specialist Correct Answer The corrosion
rate shall be adjusted to agree with the actual rate found.
An ellipsoidal head has an internal diameter of 76 inches and
depth of 21 inches (including a straight face dimension of 2
inches). What should its spherical (crown) radius be?
a. 76.9 inches
b. 15.6 inches
c. 68.4 inches
d. All of the above Correct Answer 68.4 inches
, An RBI assessment can be used to alter the inspection strategy
provided:
a. The degradation methods are identified and evaluated
b. The RBI is fully documented.
c. A third party conducts the RBI
d. Both A and B above Correct Answer Both A and B above
API 576 does not address:
a. Valve testing on test benches in shop
b. Application of rupture discs
c. Training requirements for mechanics involved in inspection
and repair of pressure relieving devices
d. All of the above Correct Answer Training requirements for
mechanics involved in inspection and repair of pressure
relieving devices
As per ASME Sec. VIII Div. 1, if permanent deformation is
observed due to over pressure during hydrotesting:
a. The inspector should ask for re-test using proper test pressure
and new pressure gauges.
b. Follow-up the hydro-testing by a pneumatic test at proper
pressure, taking suitable precautions as given in code
c. The inspector may ask for providing additional stiffening
rings around vessel and carry out re-hydro test at proper test
pressure.
d. The inspector may reject the vessel. Correct Answer The
inspector may reject the vessel.
