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Study SheetsBased on API 653 Exam Information

The following is a collection of questions remembered by various students who took the API 653Exam in the past.

This study sheet is designed to help a student prepare for the API 653 Exam. Read eachquestion carefully and select the best answer by circling your choice. After selection of youranswer, write in the section number and publication in which your answer was found. Look up eachquestion in the reference publications listed below; remember, this exercise is to help you to learnto use the reference material. Generally, the assignment is broken into several sections. Eachsection should take approximately one hour to complete. Answers will be discussed at thebeginning of class the following morning.

The answers will be found in the following reference publications:

API 650, Welded Steel Tanks for Oil Storage, Tenth Edition, November, 1998, includingAddendum 1 (January, 2000), Addendum 2 (November, 2001), and Addendum 3(September, 2003).

API RP 651, Cathodic Protection of Aboveground Petroleum Storage Tanks, Second

Edition, December, 1997API RP 652, Lining of Above Ground Petroleum Storage Tank Bottoms, SecondEdition, December, 1997

API 653, Tank Inspection, Repair, Alteration and Reconstruction, Third Edition,December, 2001, including Addendum 1 (September, 2003).

API 2015, Safe Entry and Cleaning Petroleum Storage Tanks, Sixth Edition, August, 2001.API 2207, Preparing Tank Bottoms for Hot Work, Fifth Edition, September, 1998API RP 575, Inspection of Atmospheric and Low-Pressure Storage Tanks, First Edition,

November, 1995

ASME Boiler & Pressure Vessel Code, 2001 Edition, with 2002 and 2003 AddendaSection V, Nondestructive Examination, Articles 1, 2, 6, 7 and 23 (Section SE-797only)

Section IX, Welding and Brazing Qualifications

26. How many roof rafters must a plank cross over for inspection of the roof of a tank?

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a. 1b. 2c. 3d. 4

Section: Reference Publication:

27. The maximum acceptable undercutting on horizontal butt welds of a reconstructedtank is _____ inch.

a. 1/64b. 1/32c. 1/16d. 1/8

Section: Reference Publication:

28. The minimum number of settlement points around a tank periphery is .

a. 12b. 10c. 8d. 6

Section: Reference Publication:

29. A weld shall be acceptable by visual inspection if the inspection shows which of thefollowing?

a. The weld has no cracks, no undercutting, and less than 20% coldlap.b. The weld has no cracks, undercutting is acceptable, and any surface porosity

does not exceed one cluster in any 2 of length and the diameter of each clusterdoes not exceed 1/16.

c. The weld has no crater cracks or other surface cracks, undercutting isacceptable, and any surface porosity does not exceed one cluster in any 3 oflength and the diameter of each cluster does not exceed 1/8.

d. The weld has no crater cracks, other surface cracks or arc strikes inor adjacent to the welded joint, undercutting is acceptable, and any surface porositydoes not exceed one cluster in any 4 of length and the diameter of each clusterdoes not exceed 3/32.

Section: Reference Publication:

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30. Penetrameters are normally placed on the _____ of the part being examined.

a. source sideb. film sidec. weld side

d. obverse side

Section: Reference Publication:

31. External, UT measurements of a new tank shell shall be made not later than _____years after commissioning.

a. 5b. 4c. 3d. 2

Section: Reference Publication:

32. A liquid having a closed cup flash point equal to or greater than 100oF is considered .

a. flammable materialb . combustible liquidc. gasolined. diesel

Section: Reference Publication:

33. Thin film linings are usually used for application to .

a. the bottoms of new storage tanks.b. pitted bottoms of older storage tanks.c. corroded bottoms of previous service tanks.d. rough and pitted surfaces.

Section: Reference Publication:

34. With a horizontal sweep board 36 long, peaking shall not exceed _____ inch.

a. 0.250b. 0.375c. 0.500d. 0.625

Section: Reference Publication:

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35. If a welder tests in a 6G position, he qualifies to weld .

a. all positionsb. uphill onlyc. downhill onlyd. vertical only

Section: Reference Publication:

36. An anode is .

a. an electrode of an electrochemical cell at which no corrosion occursb. an electrode of an electrochemical cell at which corrosion occursc. a chemical substance containing ions that migrated. a metallic connection that provides electrical continuity

Section: Reference Publication:

37. Widely scattered pits may be ignored, provided .

a. no pit depth results in the remaining shell thickness being lessthan 1/2t minacceptable tank shell thickness, exclusive of corrosionallowance.

b. the average pit depth is greater than 1/2tmin

, exclusive of the corrosionallowance

c. no pit depth is greater than 1/2tmin

, including the corrosion allowanced. no pit depth is less than 1/2tmin, including the corrosion allowance

Section: Reference Publication:

38. The critical zone of the tank bottom is within the .

a. Annular plate ring, within 6 of the shell or within 6 of the inside edge of theannular ring.

b. Annular plate ring, within 10 of the shell or within 10 of the inside edge of theannular ring.

c. Annular plate ring, within 12 of the shell, or within 12 of the insideedge of the annular plate ring.

d. Annular or bottom plates within 3 inches of the inside edge of the shell.

Section: Reference Publication:

39. The space between the outer periphery of the roof and the tank shell of an externalfloating roof tank shall be sealed by a flexible device that provides .

a. a minimum 1/2 gap over no more than 24b. an area of no more than 15 square inches opening calculated by measuring the

length and width of the gaps.c. a reasonably close fit to the shell surfacesd. a minimum of 3 openings 24 long with gaps no more than 1/4

Section:

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Reference Publication:

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40. What is the minimum thickness for a tank floor plate with a > 0.05 or thicker reinforcedinternal lining?

a. .005

b. .050c. .075d. .100

Section: Reference Publication:

41. A full hydrostatic test is always required on .

a. a tank that has an annular plate installed with the longest dimension less than12

b. a tank that has a door sheet installedc. a tank that has a nozzle 12 NPS installed

d. a reconstructed tank

Section: Reference Publication:

42. What is the maximum temperature that dry MT can be used?

a. 600oF

b. 135oF

c. 400oF

d. Within the temperature range limitations set by the manufacturer

Section: Reference Publication:

43. If a repair/modification weld is made on a tank shell plate that is thicker than 1, thebase metal within 3 inches of the welding shall be heated to a temperature ofapproximately degrees.

a. 120oF

b. 140oF

c. 160oF

d. 200oF

Section: Reference Publication:

44. What is the main factor in determining the efficiency of a rivet joint in a tank?

a. The allowable stress of the rivetsb. The number of rivet rows and type of jointc. The allowable stress of the plated. Whether the joints have butt straps or not

Section: Reference Publication:

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50. The maximum acceptable undercutting on vertical butt welds of a reconstructed tank is_____ inch.

a. 1/64b. 1/32c. 1/16d 1/8

Section: Reference Publication:

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