Exam 9 Closed

API 510. DAILY EXAM 9 (Closed book)Note: Encircle the letter of only one answer which you think is most appropriate.

1. Cracks are likely to occur in or adjacent to welded seams in which of the following vessels?

a. Vessels constructed of high strength steels

(above 70,000 psi)b. Vessels made from coarse grain steelsc. Vessels made of low chrome materials and

operating at high temperatured. All of the above

2. If alloy steels have undergone “temper embrittlement”, the appropriate testing to confirm the same is:

a. Hardness testingb. Impact testingc. Ductility testingd. Tensile strength testing

3. The rules for impact testing of carbon steel in Section VIII vessel materials require what kind(s) of impact test?

a. Brinell & Rockwell b. Izod & Charpy V-notch c. Charpy V-notch only is acceptable.d. Brinell only is acceptable.

4. The API authorized pressure vessel inspector may give prior authorization for repairs that do not involve:

a. Pressure tests b. Radiography c. Pneumatic testing of padsd. Final visual inspections

5. Prior to witnessing a pneumatic test of a pressure vessel, the inspector should:

a. Ensure that welds around nozzles were inspected by PT or

MT prior to commencement of test.b. Ensure that test pressure is maintained throughout the

leak testing inspection.

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c. Ensure that all butt welds were UT checked prior to commencement of test.

d. Both a and b

6. Widely scattered pits may be ignored as long as the following conditions are satisfied:i. Thickness at bottom of pits is greater than one half the vessel’s required wall thickness ii. The total area of the pits does not exceed 7 square inches (45 square centimeters) within any 8-inch (20-centimeter) diameter circle.iii. The sum of their dimensions along any straight line within the circle does not exceed 2 inches (5 centimeters).iv. ?

What is the missing item in “iv” above?

a. The thickness at bottom of pit must be measured by pit

gauge. b. The 8”diameter is to be measured from the center of the

deepest pit. c. There are no missing items; there are only 3 items to be

consideredd. The total area of the pits cannot exceed 3.5 square inches

in a 4-inch diameter circle.

7. Before any repair to a pressure vessel in accordance with its code of construction, what if any additional requirements (over and above those in API 510) may need to be considered?

a. Jurisdictional requirements that might override the API 510

Code. b. Is repair being done by repair organisation? c. The quality of the repair materials. d. The need for qualified welding procedures.

8. Reduction in likelihood of brittle fracture can be obtained by performing

a. Impact testingb. Hydrostatic testingc. PWHTd. Pneumatic testing

9. A new vessel has been installed, what must be done in order to accept the vessel for operation?


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a. A first internal inspectionb. A first internal inspection, however if a manufacturer’s

data report (U1) assuring that the vessel is satisfactory for its intended service is available the first internal inspection may be waived.

c. Base line thickness readings must be taken per OSHA 1920 (j).

d. Base line thickness reading must be taken per OSHA 1910 (j).

10. Ordinarily non-metallic coatings and linings can be most

effectively inspected by what technique?

a. Low voltage holiday tester b. Radiography c. Hammer testing d. Using a high voltage low current brush type electrode

device. (Spark Tester)

11. Titanium alloys are subject to loss of ductility in certain environments, what is this condition called?

a. High temperature embrittlementb. Low temperature embrittlement c. Hi-alloy effect d. Hydriding

12. Which of the following describes a crack in metal?

a. Cracks run parallel to the surface. b. Cracks run at right angles to the surface. c. Cracks are usually wide at one end and narrow at the other. d. Cracks always run slant to the surface.

13. Temper embrittlement is best described as:

a. Cracking due to operating at high temperatures above 700°F

b. Loss of ductility and notch toughness due to exposure above 700°F

c. Flaking of the metal surfaces, causing dip pits d. Cracking due to low temperature service

14. Thermal fatigue cracks usually are


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a. Branching, Transgranular and initiate from within the material.

b. Dagger shaped, intergranular and initiate form within the material.

c. Dagger shaped, oxide filled and initiate form the surface.d. Dagger shaped, clean and intergranular.

15. Erosion/Corrosion mitigation can be achieved by

a. Increasing the pipe diameter to decrease velocityb. Increasing surface hardness by using harder alloys or hard

facingc. Using corrosion resistant alloysd. All of the above.

16. Which of the following is a major concern when operating vessels that utilize the slurries with solid suspensions?

a. Overheating b. Erosion c. Corrosion d. Cracks

17. The inspection of a vessel to determine if a hydrogen blister is present is often best performed by:

a. Researching the inspection records b. Determine the vessels material to see if hydrogen

attack is likelyc. Swaying a flash light parallel to the vessel’s

surfaced. Recommending metallurgical tests for blisters in a

laboratory

18. When preparing to inspect a vessel which has had previous inspections what is the initial step in preparation for the inspection?

a. Assemble all the required tools to perform the

inspection. b. Review previous inspection records. c. Advice maintenance of any anticipated repairs. d. Insure that all non-destructive examinations

required have been scheduled.


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19. Which of the following best describes a “Corrosion Button” as might be found in a pressure vessel?

a. Buttons made of highly corrosion resistant material

from which corrosion loss can be measured. b. Buttons which corrode at about the same rate as

the vessel’s material and are used to estimate the vessel’s corrosion losses.

c. No such thing exists; there is however a corrosion tab used in vessels.

d. A form of corrosive product produced by certain chemicals in a vessel when is constructed of high chrome alloy material.

20. In a PRV in which the major relieving device or main valve is combined with and controlled by a self activated auxiliary pressure relief valve is:

a. Pilot operated valveb. Bellow type balancing valve c. Relief valved. Safety valve


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