API-653-Vol 2

API 653 CERTIFICATION COURSE FOR

* STORAGE TANK INSPECTOR *

COURSE NOTES

VOLUME – 2

(QUESTION BANK)

CONDUCTED FOR

Reliance Industries Limited

Navi Mumbai

CONDUCTED BY

API 653- STORAGE TANK INSPECTOR

PREPARATORY COURSE

CONDUCTED BY

Asian Training Academy, Pune.

19/ A-4 Sarita Vihar, S No 119/3/1 Parvati, Off Sinhgad Road, Pune 411030. India Tel: + 91-20-24252214, 24308068, E-mail: [email protected]

Statement

This course manual has been prepared by Asian Training Academy, Pune; INDIA., strictly for the use of attendees to API-653 Examination Preparation Course from Reliance Industries Ltd. This manual is to be used as an aid to assist those persons wishing to take the API-653 Aboveground Storage Tank Inspector Certification Examination. This manual is not all-inclusive and should not be used in place of any recognized Code or Standard. The information contained in this manual was obtained from the author’s research and experience and is intellectual property of the author.

This manual or any part of it shall not be reproduced by any means without the written consent of

Asian Training Academy, Pune

API 653- STORAGE TANK INSPECTOR

PREPARATORY COURSE

VOLUME-2

QUESTION BANK

INTRODUCTION

This material is to help prepare you for the API 653 Certification Examination. Your degree of proficiency in this material will be tested throughout the course. The below listed references are indicated as the source of the answers next to each question. To best prepare for the course and the examination, you should strive to memorize these questions and answers.

REFERENCE INDEX

API 650 Welded Steel Tanks for Oil Storage

API 651 Cathodic Protection of Aboveground Petroleum Storage Tanks

API 652 Lining of Aboveground Petroleum Storage Tank Bottoms API 653 Tank Inspection, Repair, Alteration and Reconstruction API 2015 Preparing Tank Bottoms for Hot Work

Section V ASME Boiler and Pressure Vessel Code

Nondestructive Examination

Section IX ASME Boiler and Pressure Vessel Code Brazing and Welding Qualifications.

Practice Questions for API 653 Preparatory Course

( Covering all Codes and Standards)

1) __________ is a change from previous operating conditions involving different properties of the stored product such as specific gravity or corrosivity and / or different service conditions of temperature and / or pressure"

(a) Re-rating; (b) Change in service;

(c) Repair; (d) Reconstruction

REF : API-653, - 3.7 ANS : (b)

2) A __________ is a device used to determine the image quality of a radiograph.

(a) A step wedge comparison film; (b) A densitometer;

(c) A penetramter (d) All of the above.

REF : ASME Section V, T-233 ANS : (c)

3) A corroded roof plate is found to have an average thickness of 0.1" measured over an area of 100 sq. inches. This area shall be :-

(a) Repaired or replaced; (b) Found to be acceptable;

(c) Repair is prohibited; (d) Replacement is mandated

REF : API-653, 4.2.1.2 ANS : (b)

4) A double-welded butt joint is defined as :-

(a) A joint between two members that intersect at an angle between 0 degrees (a butt joint) and 90 degrees (a corner joint).

(b) A joint between two abutting parts lying in approximately the same plane that is welded from both sides.

(c) A joint whose size is equal to the thickness of the thinner jointed member.

(d) A joint between two overlapping members in which the overlapped edge is welded. REF : API 650, 3.1.1.1

5) An external floating roof shall be provided with at least one manhole having a minimum inside diameter of __________ inches.

(a) 18; (b) 15; (c) 24; (d) 30.

REF : API 650, APP. C. 3.11 ANS : (c)

6) A formal Visual External inspection by a qualified inspector shall be done atleast :- (a) Every 5 years of ¼ CR life whichever is less

(b) Every 5 years of ½ CR life whichever is less (c) Every 2 years

(d) Every 1- years or ¼ CR life whichever is greater REF :API 653, 6.3.2.1

ANS : (a)

7) A full hydrostatic test (when required) shall be held for __________ hours :-

(a) 24; (b) 8; (c) 18; (d) 12

REF : API 653, 12.3.1.1 ANS : (a)

8) A full-fillet weld is a weld that :- (a) not less than 1/3 the thinner plate;

(b) the legs equal the thickness of the thinner plate;

(c) the largest isosceles triangle that can be inscribed within the cross section of the weld (d) is atleast the thickness of the thicker plate

REF : API 650 3.1.1.7 ANS : (b)

9) A hot tap in a 1.25" thick tank with a minimum metal temperature of 65o_{F at time of hot tap,}

without having material toughness data is :-

(a) not permitted; (b) permitted;

(c) not enough information; (d) not addressed by the code

REF : API 653 – 9.13.4 & Fig. 9-5 ANS : (a)

10) A hydrostatic test for a relocated tank :-

(a) may be waived by the Owner / Operator; (b) is required;

(c) may be waived by the Inspector; (d) is not necessary

REF : API 653, 12.3.1.1 (a) ANS : (b)

11) A liquid penetrant examiner must have vision to enable him to read Jagger Type 2 standard chart at a distance of not less than 12 inches and is capable of distinguishing and differentiating contrast between colours used. Examiners shall be checked __________ to ensure that they meet these requirements :-

(a) Quarterly; (b) Semi-Annually;

(c) Annually; (d) Bi-Annually.

REF : API 650, 6.4.3 (a) ANS : (c)

12) A procedure qualification record (PQR) shall address :- (a) non-essential variables;

(b) (b) essential variables;

(c) supplemental essential variables (when required); (d) (d) both (b) and (c)

REF : ASME Sec IX, QW-200.2 ANS : (d)

13) A radiograph is made using an X-ray source and two films in each film holder. For composite viewing, each film of the composite shall have a minimum density of :-

14) A reconstructed tank with a total height of 25' has been determined to have an out-of-plumbness of 2-3/4". This is :-

(a) acceptable; (b) unacceptable;

(c) not covered by the code (d) corrected by eternal strengthening

REF : API-653, 10.5.2.1 ANS : (a)

15) A riveted tank shell with a butt joint has 3 rows. What is the joint efficiency ?

(a) 0.75"; (b) 0.85"; (c) 0.90; (d) 0.91.

REF : API-653, Table 4-2 ANS : (b)

16) A SAW welding operator is attempting to quality by radiography on a 6 inch thick test coupon. Elongated slag inclusions are measured to be 0.2 inch long.

(a) Must weld 2 additional coupons; (b) meets the requirements (passes)

(c) slag must not exceed 0.5" (d) slag is not acceptable.

REF : ASME Section IX, QW-191.2.2 ANS : (b)

17) A self-supporting cone roof :-

(a) is formed approximately to the surface of a right cone; (b) both a and d

(c) has columns and / or rafters on trusses (d) is supported at the periphery.

REF : API 650 3.10.1 (a) ANS : (b)

18) A shell to bottom fillet weld for a Grade IV material shall be

(a) made with atleast 2 passed; (b) may be made with 1 pass (c) shall be atleast 3 / 16" (d) both (a) and (c) above

REF : API 650 3.1.5.7 c ANS : (a)

19) A single film technique was used to make a radiograph using a Cobalt-60 source. The minimum permitted density in the area of interest is :

(a) 4.0; (b) 1.8; (c) 2.0; (d) 1.3.

REF : ASME Section V, T-282 ANS : (b)

20) A supported cone roof :-

(a) is formed approximately to the surface of a right cone; (b) both (a) and (c);

(c) has columns and / or rafters on trusses; (d) is supported at the periphery

REF : API 650 3.10.1 (a) ANS : (b)

21) A tank bottom depression is 9.125" deep, radius of depression is 22.5 feet. What is the maximum depth of depression ?

(a) 7.825"; (b) 8.062"; (c) 8.125"; (d) 8.325" REF : 653 APP. “B” B-6

ANS : (d)

22) A tank bottom lining with a measured thickness of 15 mils should be tested with :- (a) A high voltage detector in accordance with NACE RP0188;

(b) A low voltage (67.5 volts) wet sponge detector; (c) A calibrated Ultrasonic tester;

(d) An Eddy Current lift-off detector; REF : API-652, 7.3.2

ANS : (b)

23) A weld shall be unacceptable by Visal Inspection if the inspection shows which of the following ?

(a) The weld has no crater cracks or other surface cracks.

(b) Undercutting exceeds the limits given in 5.2.1.4 for vertical or horizontal butt joints. (c) The frequency of surface porosity in the weld does not exceed one cluster (one or more

pores) in any four inches of length, and the diameter of each cluster does not exceed 3/32 inch.

24) A weld with a nominal thickness of 1.5 inch is to be radiographed using a film side penetrameter, hole type. The penetrameter designation should be :-

(a) 25; (b) 30; (c) 35; (d) Both (a) and (b) are responsible;

REF : ASME Section V, T-276 ANS : (a)

25) A welder may deviate from the parameters specified in WPS if they are nonessential

variables :-

(a) Provided authorisation from inspection is documented; (b) Provided the welding supervisor approves;

(c) No;

(d) Nonessential variables only apply to PQRs REF : ASME Section IX, QW-200.1 ANS : (c)

26) A welder qualifies in the 3G position on a plate coupon, he is then qualified to weld in the position(s) on NPS 6 pipe :-

(a) F, V; (b) F only; (c) F, V, O; (d) ALL

REF : ASME Sec IX, QW-461.9 ANS : (b)

27) A welder who is qualified using a double-groove weld :-

(a) is also qualified to make a single V-groove weld without backing; (b) is also qualified to make a single V-groove weld with backing; (c) may weld in the 6G position;

(d) must requalify every 2 months

REF : ASME Section IX, QW-402.2 ANS : (b)

28) A welder's ID must be placed at intervals not exceeding along completed welds :-

(a) One foot; (b) One and a half feet;

(c) Two feet; (d) Three feet.

REF : API-653, 11.2.2 ANS : (d)

29) A welding procedure qualified on ¼ inch thick plate can be used to weld groove welds in materials from to :-

(a) 3/16 to 3/4; (b) 1/16 to 3/4; (c) 3/8 to 3/4; (d) 1/16 to 1/2.

REF : ASME Sec IX, QW-451.1 ANS : (d)

30) A welding procedure qualified on 3/8" thick plate can be used to weld groove welds in materials :-

(a) 3/16 to 3/4; (b) 1/16 to 3/4; (c) 3/8 to 3/4; (d) 1/16 to 3/8.

REF : ASME Sec IX, QW-451.1 ANS : (b)

31) A welding procedure qualified under the 1965 ASME Code Section IX : (a) Is obsolete;

(b) Is still applicable;

(c) Must be re-qualified every 3 years when code is re-issued; (d) is not addressed by the code

REF : ASME Section IX Forward ANS : (b)

32) Above-ground storage tank is defined as a stationary container with a barrel capacity greater than :-

(a) 2000 barrels; (b) 300 barrels; (c) 500 barrels; (d) 750 barrels.

REF : API 651-1.2.1 ANS : (c)

33) Acceptance standards for MT examination shall be per :- (a) AWS D-1.1;

(b) SNT-TC-1A;

(c) Appendix 6 of ASME Sect VII, div. 1 (d) Article 7 of ASME Sect V

34) All tanks shall be given a formal visual external inspection by an inspector at least :- (a) every 3 years or at quarter corrosion rate;

(b) every 5 years or at quarter corrosion rate; (c) every 3 years or at half corrosion rate; (d) every 5 years or at half corrosion rate.

REF : API-653-6.3.2.1

ANS : (b)

35) inspection only when :- (a) operations dictate;

(b) construction allows external access to the tank bottom to determine thickness; (c) all insulation is removed from the tank;

(d) no alternate is allowed. REF : API 653 6.5 ANS : (b)

36) Anticipated minimum thickness of tank bottom where bottom / foundation design provides for leak detection and containment is :-

(a) 0.10"; (b) 0.05"; (c) 0.09";

(d) same as without leak detection and containment. REF : API 653 Table 6-1

ANS : (b)

37) Radiographic location markers are to be placed

(a) on the exposure holder / cassette; (b) on the part;

(c) between the part and the film; (d) either (b) or (c) above

REF :ASME Section V-T375 ANS : (d)

38) At what design metal temperature must impact tests be made for all weld metal and

procedures to be used ?

(a) Below 32o_{F; (b) Below 20}o_{F; (c) Below 15}o_{F; (d) Below 10}o_F.

REF : API 650-7.2.2.4 ANS : (b)

39) At what level is the atmosphere considered oxygen-deficient ?

(a) less than 19.5 %; (b) less than 21.9 %;

(c) less than 24.9 %; (d) less than 16.0 %

REF : API 2015 – 3.3 ANS : (a)

40) Base metals are grouped into groupings according to their welding characteristics :-

(a) F-number; (b) AWS;

(c) A-number; (d) P-number.

REF : ASME Sec IX, QW-421 ANS : (d)

41) Based on a measured corrosion of 0.006" annually and using a corrosion allowance of 0.120", how long before the next UT thickness measurements are required ?

(a) 10 years; (b) 36.5 years;

(c) 20 years; (d) 15 years.

REF : API-653 6.3.3.2 ANS : (d)

42) Based on variable-design point method, calculate the first course thickness, exclusive of CA, for a 200 foot diameter tank, purchaser specified specific gravity of 1, 56 feet in height, using 96 inch courses with material stress of 23,000 psi. Design is based on test conditions :-

(a) 0.853; (b) 0.934; (c) 1.239; (d) 1.220

REF : API 650-3.6.4 ANS : (c)

43) Before elevating the operating temperature of a shell tank to a temperature above 200 degrees F, what document must be considered ?

(a) API RP 650, Welded Steel Tanks for Oil Storage; (b) API 650, Appendix M;

(c) API RO 650, Lining of Aboveground Petroleum Tanks; (d) Publication 2207, Preparing Tank Bottoms for Work.

44) Bimetallic corrosion can occur when :-

(a) A bronze check valve is joined to steel piping;

(b) Either stainless steel or copper is connected to a steel tank; (c) Neither (a) or (b);

(d) Both (a) and (b).

REF : API 651 2.2.2 ANS : (d)

45) Bottom leak detection :-

(a) can be detected by installation of cathodic protection; (b) can be detected by observation at a tell-tale hole; (c) is a hazard that can not be detected;

(d) never happens when lining are properly installed. REF : API 651 2.2.2

ANS : (b)

46) Bottoms exceeding 100' diameter in tanks operating above 200o_{F shall have :-}

(a) butt-welded annular bottom plates; (b) be made of a Group IV, V or VI material; (c) have a modulus of elasticity of 30,000,000; (d) all of the above.

REF : API 650 App M.4.1 ANS : (a)

47) Hot water is defined as :- (a) Work than can lead to fever;

(b) an operation that can produce a spark or flake hot enough to ignite flammable vapours; (c) an atmosphere between the LEL and UEL;

(d) both (a) and (c) above. REF : API 2207, 1.1 ANS : (b)

48) Cathodic protection is achieved by directing the flow of current from :-

(a) A cathode to an anode; (b) An anode to a cathode;

(c) Both installations are unacceptable; (d) Neither (a) or (b). REF : API 651 5.2.1

49) Concrete rings shall be inspected for :-

(a) broken concrete, spalling, cracks; (b) vegetation against tank;

(c) holidays in paint; (d) only (a) and (b).

REF : API 653 Appendix C, C.1.1.1 ANS : (d).

50) Construction, inspection and repair records shall be maintained by the :-

(a) Manufacturer; (b) Inspector;

(c) Owner / Operator; (d) Jurisdiction. REF : API 653, 13.2.1

ANS : (c)

51) Describe how a liquid penetrant examination should be performed in order to detect

discontinuities, which are open to the surface :-

(a) clean the part, apply the developer, apply the penetrant, remove excess penetrant, inspect the part, clean the part;

(b) clean the part, apply the penetrant, remove excess penetrant, apply the developer, inspect the part, clean the part;

(c) clean the part, apply the developer, apply the penetrant, inspect the part, remove excess penetrant, clean the part;

(d) clean the part, apply the developer, apply the penetrant, inspect the part, clean the part. REF : ASME Section V-T620

ANS : (b)

52) Tank with 17 mils of the original 25 mils corrosion allowance still remaining after 15 years ? (a) 5 years; (b) 15 years; (c) 23.875 years; (d) 31.875 years.

REF : API 653, 6.3.3.2 (c) ANS : (b)

53) Determine the maximum allowable height for a 90 foot diameter tank based on a maximum shell plate thickness of 0.5 inch and maximum allowable stress of 21,000 psi, with a joint efficiency of 0.85, and no corrosion allowance :-

54) Differential settlement leads to :-

(a) potential floating roof hang up; (b) lack of circularity at the top;

(c) oval shape at the top; (d) all of the above.

REF : API 653 Appendix B.2.2.3 ANS : (d)

55) Distorted anchor bolts may indicate :-

(a) overpressure uplift condition; (b) foundation settlement;

(c) both (a) and (b) above; (d) anchor bolts do not distort.

REF : API 653, 4.5.3 ANS : (c)

56) During an inspection, you are required to calculate the retirement thickness for the bottom course of a tank. The information available is as follows :-

Diameter = 150 feet Height = 40 feet

Specific gravity of contents = 0.77 Joint efficiency = 0.7

Material tensile strength is unknown Material tensile strength is unknown;

Material maximum allowable stress is unknown.

(a) 0.050; (b) 0.7141; (c) 0.500; (d) 0.5625

REF : API 653, 4.3.3.1 ANS : (c)

57) During hydrostatic test, no less than ______ settlement measurement points shall be surveyed :-

(a) 8; (b) 10; (c) 15; (d) 5.

REF : API 653, 12.5.1.2

ANS : (a)

58) E7018 electrodes are classified as F number :-

(a) 1; (b) 2; (c) 4; (d) 5.

REF : ASME Sec IX, QW-432

59) Essential variable on a welding procedure specification :-

(a) those in which a change, as described in the specific variables, is considered to affect the mechanical properties of the weldment;

(b) variable are listed in section IX of the ASME CODE; (c) both (a) and (b) above.

(d) are the same for all procedures.

REF : ASME Section IX, QW 251.2

ANS : (c)

60) Examiners who perform ultrasonic examinations under API-650 shall be qualified and certified by the manufacturers as meeting the requirements of certification as outlined in ?

(a) ASME; (b) ASNT-TC-1A; (c) API-650; (d) API-653.

REF : API 650, 6.3.3 ANS : (b)

61) Except as modified in Section 6 of API-650, the radiographic method employed shall be in accordance with which Section and article of the ASME code ?

(a) Section II, Article 2; (b) Section III, Article 1; (c) Section V, Article 2; (d) Section IX, Article 1.

REF : API 650, 6.1.3.1 ANS : (c)

62) Exclusive of corrosion allowance, what is the minimum nominal thickness for all new construction bottom plates?

(a) 1/2 inch; (b) 1/4 inch; (c) 3/16 inch; (d) 5/8 inch.

REF : API 650-3.4.1

ANS : (b)

63) Existing shells shall be analyzed by experienced personnel for :-

(a) Fluid static head, internal and external pressure, wind loads, settlement and business needs;

(b) Wind loads, settlement, fluid static head, internal and external pressure and nozzle loads; (c) Internal and external pressure, wind loads, fluid static head, settlement and if it

convenient.

(d) Only (a) and (b) above. REF : API 653, 4.3.1.2

64) External tank bottom inspection is permitted :- (a) when required by the inspector; (b) only when reassembly is being done.

(c) where construction, size or other aspects allow; (d) is not permitted.

REF : API-653, Table 6-1; 6.5 ANS : (c)

65) Find the capacity of a small tank, with a joint efficiency of 0.85, specific gravity = 1.0, no corrosion allowance, diameter is 40 feet, height is 30 feet with 5 completed 72" courses.

(a) 5,370; (b) 5,140; (c) 6,710; (d) 7,350.

REF : API 650 – Appendix A.2.2 Table A-1

ANS : (c)

66) Flaws such as cracks in the weld in shell-to-bottom of a tank are :- (a) not critical;

(b) acceptable if length is less than twice the width; (c) to be removed and repaired;

(d) welded over without needing to be removed. REF : API-653, 4.3.6

ANS : (c)

67) Floating root anti-rotation devices shall be evaluated for :-

(a) needed repairs; (b) replacement;

(c) ultrasonically for flaws; (d) only (a) and (b) above.

REF : API 653, 4.2.3.3 ANS : (d)

68) For a 30 inch shell manhole, 0.5 inches thick shell and reinforcing plate, what minimum neck thickness is required ?

(a) 3/16; (b) 3/8; (c) 1/2; (d) 5/16.

REF : API 650 – 3.7.5.1 (Table 3-5) ANS : (d)

23,430 (49) (150) 2.6

69) For an existing 150 foot diameter storage tank, which has been in service for 28 years, known joint efficiency is 1.0, contents have been the same, with a specific gravity of 1.0, material yield of plate is 30,000 and tensile strength is 55,000, liquid fill level is 50 feet, calculate the minimum allowable thickness for the second course :-

(a) 0.6789; (b) 0.7962; (c) 0.8056; (d) 0.8156.

REF : API 653, 4.3.3.1 ANS : (d)

70) For butt-welded joints in which the thinner shell plate is 3/8 inch or less, how many spot radiographs shall be taken in the first 10 feet of completed vertical joint of each type and thickness welded by each welder or welding operator ?

(a) One; (b) Two; (c) Three; (d) Four.

REF : API 650 – 6.1.2.2

ANS : (a)

71) For dome roofs that are flanged, the radius of curvature is limited by the depth of the roof, including the crown and knuckle depth. What is t he maximum roof depth for a shop assembled cone roof 10 feet in diameter?

(a) 2.0"; (b) 3.5"; (c) 5.5"; (d) 8.0 REF : API 650 – J.3.5.3 (Table J-1)

ANS : (c)

72) For impact testing materials, what is the minimum transverse value of Group IV materials, 1.5" thick ?

(a) 13 foot – pounds; (b) 15 foot – ponds;

(c) 20 foot – pounds; (d) 25 foot – pounds;

REF : API-650 Table 2-4 ANS : (c)

73) For impact testing materials, what is the minimum longitudinal value for a 1.8" thick A-516-70 as rolled material for a WPS ?

(a) 50 foot – pounds;

(b) (b) 15 foot – pounds; (c) 42 foot – pounds; (d) (d) 40 foot – pounds.

74) For new or repaired shell horizontal joints, how many radiographs shall be taken for each 50 feet of horizontal joint, not including those required at intersections of vertical and horizontal joints ?

(a) 1; (b) 2; (c) 3; (d) 5.

REF : API 653 – 12.2.1.2

ANS : (a)

75) For welds that attach nozzles, manholes, cleanout openings and permanent attachments, undercut shall not exceed ______ inch.

(a) 3/32; (b) 1/8; (c) 3/16; (d) 1/64.

REF : API 650, 6.5.1 ANS : (d)

76) Foundations of relocated tanks specified as true to horizontal plane without ring walls shall be true :-

(a) ± 1/8" in any 30' and ± 1/4" in the total circumference; (b) ± 1/8" in any 30' and ± 1/2" in the total circumference; (c) ± 1/8" in any 10' and ± 1/2" in the total circumference; (d) ± 1.4" in any 30' and ± 1/2" in the total circumference.

REF : API 653, 10.5.6.2 b

ANS : (c)

77) From what type of material should shims be fabricated when they are to be used to radiograph welds ?

(a) Malleable materials capable of being drilled;

(b) From the same heat number as the material being inspected;

(c) Fabricated of radiographically similar material to the object to be inspected; (d) All of the above.

REF : ASME Section V, T277.3

ANS : (c)

78) Generally, tank bottom linings cover the entire tank bottom and extend ____ inches up the shell of the tank :-

(a) 10 – 15 inches; (b) 12 - 18 inches; (c) 18 – 24 inches; (d) 24 – 30 inches. REF : API 652 4.4

79) Hot taps are not permitted :-

(a) on the roof of a tank or within the gas / vapour space of a tank; (b) where heat of welding may cause environmental cracking; (c) hot (a) and (b);

(d) (a) only.

REF : API 653 – 9.13

ANS : (c)

80) Safe entry administrative controls include :- (a) an emergency plan;

(b) atmospheric testing; (c) ventilation procedures; (d) all of the above.

REF : API 2015, 2.1 ANS : (d)

81) How does the calculation of minimum thickness for a riveted tank shell differ from that of a welded tank shell :-

(a) The formula for the calculation of minimum thickness of a riveted tank shell is the same as for a welded tank shell except that the maximum allowable stress (S) is 21,000 lbs / sq. inch and the efficiency equals 1 for the shell plate 6 inches away from rivets;

(b) The formula for the calculation of minimum thickness of a riveted tank shell is exactly the same for a welded tank;

(c) The formula for the calculation of minimum thickness of a riveted tank shell is the same as for a welded tank shell except the minimum allowable stress (S) is 21,000 lbs /s q. inch and the efficiency equals 0.85 for the shell plate 6 inches away from the rivets. (d) API does not set minimum thickness.

REF : API-653, 4.3.4.1

ANS : (a)

82) How many equally spaced measurement are required for the thickness averaging technique ? (a) 2; (b) 5; (c) 4; (d) 3.

REF : API 653, 4.3.2.1

ANS : (b)

83) How many impact specimens must be broken for an average value for P1, Group 1, 2, 3 material? (a) 2; (b) 3; (c) 4; (d) 6.

84) How many inches must project beyond the outside edge of the weld attaching t he bottom sketch plate to the shell plate ?

(a) atleast 1/2 inch; (b) atleast 2 inches;

(c) atleast 9/16 inch; (d) atleast 1.0 inch

REF : API 650 – 3.4.2 ANS : (d)

85) How many settlement measurement points are required for a tank that measures 200 ft. in diameter ?

(a) 30; (b) 8; (c) 21; (d) 10.

REF : API 653, APP. “B” B-2

ANS : (c)

86) How many specimens and impact tests must be performed from a single test coupon or test location ?

(a) 1; (b) 2; (c) 3; (d) 4.

REF : API 650 2.2.8.3

ANS : (c)

87)How many specimens must be broken for an average value for P1, Group 1, 2, 3 material ?

(a) 2; (b) 3; (c) 4; (d) 6.

REF : API 650, 2.2.8.3

ANS : (b)

88) Hydrochloric acid may be formed by :-

(a) Sodium and potassium; (b) Magnesium and calcium chlorides;

(c) Calcium chlorides and sodium; (d) Potassium and Magnesium. REF : API Chapter II, 202.022

ANS : (b)

89) Hydrostatic tests shall be held for ____ hours :-

(a) 2; (b) 8; (c) 24; (d) 72.

REF : API 653, 12.3.1.1

90) If penetrameters are not placed adjacent to the welds, what rules apply ?

(a) The penetrameter should be placed on the source side of the material being radiographed. (b) The penetrameter may be placed on the film side of the material being radiographed. (c) Lead letter "F" at least as high as the identification number is placed adjacent to the film

side penetrameter;

(d) All of the above.

REF : ASME Section V, T277 ANS : (d)

91) In a radiographic film of a weld, how is film sensitivity or quality measured? (a) by use of a penetrameter;

(b) by film density;

(c) comparing to known defects; (d) all of the above.

REF : ASME Section V, T282, T283 ANS : (a)

92) In a riveted tank shell, a butt joint has 3 rows. What is the joint efficiency ?

(a) 0.75; (b) 0.85; (c) 0.90; (d) 0.91.

REF : API 653, Table 4-1 ANS : (b)

93) In accordance with ASME Section V, intensifying screens :- (a) Can always be used;

(b) Can be used unless restricted by the referencing Code; (c) Can never be used;

(d) Can be used only with Type 1 film. REF : ASME Section V T-232

ANS : (b)

94) In general, if shell thickness does not exceed ____ inch, it does not require further assessment for brittle fracture :-

(a) 0.25; (b) 0.75; (c) 1.00; (d) 0.50

REF : 653, Notes for FIG. 5-1 ANS : (d)

95) In tank floors, the maximum depth of bulge or edge settlement is dependent upon :- (a) Floor thickness; (b) The radius of an inscribed circle in the area; (c) tank diameter; (d) Tank height.

REF : API 653 APP. “B” ANS : (b)

96) Information needed when determining the rate of corrosion :- (a) Original thickness or last inspection thickness;

(b) Current thickness;

(c) Length of time in service; (d) All of the above.

REF : API 653, ANS : (d)

97) Inspection history as required in the tank records is :-

(a) all measurements taken, condition of all parts inspected and a record of all tests and examinations;

(b) personnel certification; (c) training records;

(d) the as built record from the erector. REF : API 653, 6.8.3

ANS : (a)

98) _____ inspection may be substituted for a program of external UR thickness measurements:-

(a) Hydrostatic; (b) External; (c) Acoustic; (d) Internal. REF : API 653, 6.3.3.3 ANS : (d)

99) Inspection of emergency P/V hatches includes :-

(a) Servicing;

(b) (b) Removing oil from seals; (c) Action to prevent chattering; (d) (d) Only (a) and (c) above.

REF : API 653, appendix C.2.7.4 ANS : (d)

100) Inspection of insulation :- (a) is not required;

(b) is done in routine in-service inspections; (c) requires material traceability records; (d) only (b) and (c) above.

REF : API 653, 6.3.1.3 ANS : (b)

101) Insulated tanks shall have their insulation removed :- (a) completely prior to inspection;

(b) yearly;

(c) from welded joints only;

(d) to extent necessary to determine the external condition. REF : API 653, 6.3.2.2

ANS : (d)

102) Interference current problems in cathodic protection are can be approached by :- (a) drainage of collected current to sacrificial anodes;

(b) design to mimnimise exposure;

(c) provide metallic return of collected current to a foreign structured; (d) all of the above.

REF : API 651, 8.4.1 ANS : (d)

103) Internal inspection intervals are determined by corrosion rates. Normally, the corrosion rates govern :- (a) roof; (b) upper shell; (c) bottom; (d) lower shell. REF : API 653 6.4.2.1 ANS : (c)

104) Internal inspection intervals normally :-

(a) are controlled by bottom corrosion rates; (b) shall not exceed 20 years;

(c) owner / user is free to set any convenient material; (d) both (a) and (b) above.

105) Internal inspection is primarily to :- (a) all of the below;

(b) Ensure that the bottom is not corroded and leaking; (c) Gather data for assessment;

(d) Identify and evaluate bottom settlement. REF : API – 653, 6.4.1

ANS : (a)

106) Intervals between internal inspections shall be determined by the corrosion rate. Normally, bottom corrosion rates control the inspection interval. However, in no case shall the interval inspection interval exceed ____ years :-

(a) 10; (b) 15; (c) 20; (d) 25.

REF : API 653 – 6.4.2.1

ANS : (c)

107) Letters and numerals on nameplates shall not be less than inch high.

(a) 5/32; (b) 5/16; (c) 3/16; (d) 1/8.

REF : API 650 8.1.1

ANS : (a)

108) Liquid penetrant examiners shall be qualified in accordance with ____ :- (a) ASME Section VIII, div. 1 Appendix 8.

(b) API 650;

(c) ASNT proc. SNT-TC-1A (d) ASME SECTION V, Art 6.

REF : API 650, 6.4.3 ANS : (b)

109) Magnetic particle examination shall be performed in accordance with a written procedure that is in compliance with the requirements of :-

(a) ASME Section V, Art. 7; (b) ASME Sectin IX, Art. 2;

(c) SNT-TC-1A; (d) Appendix C, API 653.

REF : API 650, 6.2.1

110) Measurement of film thickness of tank bottom linings are taken :- (a) only when the film has completely dried;

(b) both before and after the film has dried; (c) in accordance with ASNT;

(d) only if there is reason to believe it is thin. REF : API-652, 7.3.2.2

ANS : (b).

111) Minimum spacing between toes of welds for a radius (R) on a penetration and other welds of 1.25" plate must be :-

(a) 6"; (b) 7.5"; (c) 3"; (d) 1.25" REF : API 653 Figure 9-1

ANS : (b)

112) Minimum thickness calculation for shells of tanks 200 ft. or less in diameter shall be done using ____ :-

(a) the variable design point method fo API 650; (b) ASME section VII, div. 1;

(c) the formula given in API 653; (d) either (a) or (c) may be used.

REF : API 653, 4.3.3.2 ANS : (d)

113) Acceptance criteria for NDT of reconstructed tanks are to be in accordance with :-

(a) ASME Section VIII; (b) ASME Section V;

(c) API 653; (d) API 650.

REF : API 650, 6.1.5, 6.2.4, 6.3.4 ANS : (d)

114) Of the following welding processes, which one is not permitted for welding on above ground storage tanks :-

(a) SMAW; (b) GMAW; (c) OFW; (d) SAW.

REF : API 650, 5.2.1.1

115) On plates more than 3/16 inch thick, the fillet weld thickness shall not be less than 1/3 the thickness of the thinner plat at the joint and shall be atleast :-

(a) 1/2 inch; (b) 1/4 inch; (c) 3/16 inch; (d) 9/32 inch. REF : API 650 – 3.1.3.3

ANS : (c)

116) On the drawing that the manufacturer shall furnish the purchase, you would expect to see which of the following information :-

(a) The required shell thickness for both the design condition (including corrosino allowance) and the hydrostatic test condition;

(b) The nominal thickness used;

(c) The material specification and allowable stresses; (d) All the above.

REF : API 650, 3.6.1.8 ANS : (d)

117) Opening in tank shells larger than required to accommodate a _____ inch standard-weight coupling shall be reinforced :-

(a) 1.0 inch; (b) 1.5 inch; (c) 2.0 inch; (d) 2.5 inch. REF : API 650 – 3.7.2.1

ANS : (c)

118) Pan-type, pontoon-type and double-deck-type are examples of :-

(a) internal roofs;

(b) external roofs;

(c) both internal and external roofs; (d) roofs on tanks < 200' in dia.

REF : API 650 appendixes C & H

ANS : (c)

119) Per API 650, calculation of shell thickness by the 1-foot method cannot be used for tanks :- (a) under 200 ft. in diameter; (b) over 200 ft. in diameter;

(c) under 150 ft. in diameter. (d) of any size.

REF : 650 3.6.3.1

120) Pinhole leaks or porosity in tank bottom joints may be repaired by :-

(a) grinding and out area; (b) penning over affected area;

(c) applying additional weld bead over area; (d) mechanical caulking. REF : API 650 – 5.4.2

ANS : (c)

121) Piping connections such as nozzles shall be inspected for :-

(a) structural adequacy; (b) thickness of component;

(c) reinforcement; (d) all of the above.

REF : API 653, 4.3.9 ANS : (d)

122) Plate material thicker than ____ inches shall be normalised or quench tempered, killed, made to fine grain practice and impact tested :-

(a) 2.00; (b) 1.75; (c) 1.50; (d) 1.00

REF : API 650, 2.2.1.4

ANS : (c)

123) Plates found to be thinner than those in the course above it are :- (a) not allowed;

(b) permitted;

(c) permitted provided they were so designed; (d) need to be calculated for suitability for service.

REF : API 650, 3.6.1.5 ANS : (a)

124) Procedure qualification for welding on a tank of unknown or obsolete material shall be done using test coupons of :-

a) any P-1 material;

b) any similar type material;

c) material from the same P number grouping; d) actual material from the tank.

REF : API 653, 11.1.2 ANS : (d)

125) Procedure requirements for ultrasonic examination of welds :-

(a) shall be performed to a written procedure; (b) approved by ASNT; (c) proven to the satisfaction of the inspector; (d) both (a) and (c) above.

REF : ASME Section V, T150 c ANS : (d)

126) Pure hydrocarbon fluids :-

(a) usually cause corrosion;

(b) require special corrosion control; (b) both (a) and (b);

(c) (d) are usually not corrosive. REF : API-651, 1.1.3 ANS : (d)

127) Radiographic acceptance standards are found in :- (a) ASME Section VIII, div. 1, para UW-51; (b) ASME Section V, Article 2;

(c) API 650, Section 3; (d) API 653, Appendix D.

REF : API 650 6.1.5

ANS : (a)

128) Reinforcement pads shall be tested by applying pressure between the tank shell and reinforcement plate using the telltale hole. How much pressure is used to perform this inspection:-

(a) 15 psig hydrostatic pressure; (b) 15 psig pneumatic pressure;

(c) 5 psig hydrostatic pressure; (d) 5 psig pneumatic pressure.

REF : API 650 – 5.3.5 ANS : (b)

129) Repairs of cracks in the shell-to-bottom :-

(a) are only necessary if they exceed 0.25" in length;

(b) are performed on an individual basis, according to extent of damage; (c) may be welded over and left as is without reinspection;

(d) both (b) and (c) above. REF : API-653, 4.3.6 ANS : (b)

130) Resistivity of surrounding soil may be used to determine the probability of corrosion on tank bottoms. Which of the following resistivity ranges is considered to be very corosive :-

(a) < 500; (b) 500 – 1000; (c) 1000 – 2000; (d) < 10,000

REF : API 651 – 3.3.1.3 (Table – 1)

ANS : (a)

131) Rewelding vertical joints requires cutting horizontal welds back from the joint a minimum of ____ inches :-

(a) 1/2; (b) 1; (c) 2; (d) 12.

REF : API 653 Figure 9-1 ANS : (d)

132) Flame arresters are to be inspected :-

(a) semi-annually;

(b) annually;

(c) at intervals determined by experience locally; (d) every 5 years.

REF : API Chapter XIII 13.4.2.11

ANS : (c)

133) Routine visual inspection by Owner / Operator personnel shall be done at least :- (a) annually; (b) bi-monthly; (c) monthly; (d) semi-annually. REF : API 653, 6.3.1.2

ANS : (c)

134) With a vertical sweep board 36 inches long, banding on reconstructed tanks shall not exceed ____ inch(s) :- (a) 1/2"; (b) 3/4"; (c) 1"; (d) 1 ½". REF : API-653, 10.5.5 ANS : (c)

135) Scheduled external inspections shall be performed at least :-

(a) the lesser of every 5 years of 1/2 corrosion rate of the shell life; (b) the lesser of every 5 years or 1/4 corrosion rate of the shell life; (c) the lesser of every 10 years or 1/2 corrosion rate of the shell life; (d) the lesser of every 10 years or 1/4 corrosion rate of the shell life. REF : API 653, 6.3.2.1

ANS : (c)

136) Seal material shall be placed :-

(a) between the outer periphery of the roof and the tank shell; (b) around columns, ladders and gauge pipes that penetrate the deck; (c) the seal shall be flexible;

(d) all of the above.

REF : API 650 Appendix H.3.5 ANS : (d)

137) Shell penetrations experiencing corrosion must be assessed and :- (a) tank rerated;

(b) repair procedures established; (c) tank removed from service; (d) both (a) and (b) above.

REF : API 653, 4.3.9 ANS : (d)

138) Small punctures in floating roof systems :-

(a) may be ignored if they have been determined to be non-critical; (b) shall be repaired;

(c) shall be replaced; (d) either (b) or (c) above. REF : API-653, 4.2.3.1 ANS : (d)

139) Tack welds shall be made using a procedure qualified in accordance with ASME Section IX :- (a) Fillet weld; (b) Groove or fillet weld;

(c) Special; (d) Butt weld.

REF : API 650, 5.2.1.8 ANS : (b)

140) Tank grounding shunts shall be inspected :-

(a) visually; (b) infrared camera;

(c) by a certified electrician; (d) need no inspection. REF : API 653, 6.3.2.4

ANS : (a)

141) Tanks reconstructed in accordance to API-653 shall be identified with a corrosion-resistant metal nameplate with letters not less than ____" high :-

(a) 5/32; (b) 7/32; (c) 9/32; (d) 3/32.

REF :- API 653, 13.1.1

ANS : (a)

142) Tests for leaks in reinforcing plate welds require ____ psig :-

(a) upto 2.5; (b) upto 15; (c) upto 21; (d) upto 30. REF : API 653/12.4 & 650 5.3.5

ANS : (b)

143) The "critical zone" for tank bottom repairs is the area within the annular plate ring, within inches of the shell or within inches of the inside edge of the annular plate ring:-

(a) 12, 6; (b) 6, 12; (c) 12, 12; (d) 6, 6

REF : API 653, 9.9.11

ANS : (c)

144) The "L" in actual thickness determination for each shell course : (a) may be greater than 40";

(b) is valid only when corroded area is less than 40"; (c) applies even if corroded area is greater than L; (d) requires converting "D" from feet to inches.

REF : API 653, 4.3.2.1 See Note

145) The 6 G position for welding is a :- (a) Qualification position; (b) Production welding position;

(c) Rod position;

(d) Rank position.

REF : ASME Sec IX QW-120

ANS : (a)

146) The API 653 standard covers the maintenance inspection, repairs, alteration, relocation and reconstruction of tanks constructed to which one of the following standards :-

(a) ASME; (b) API 651; (c) API 65; (d) API 650.

REF : API 653, 3.1.1 ANS : (d)

147) The assessment period for inspection of tank bottom integrity is :- (a) is always 5 years;

(b) is fixed by corrosion rate;

(c) less than or equal to the appropriate internal inspection interval given in API-653 6.4.2

(d) determined by the designer. REF : API-653, 4.4.1

ANS : (c)

148) The complete or partial removal and replacement of more than 12 inches of a vertical weld joining shell plates is considered a :-

(a) minor alteration; (b) minor repair;

(c) major alteration; (d) major repair.

REF : API 653, 12.3.1.2 (c)

ANS : (d)

149) The definition of a confined space is :-

a) large enough to enter;

b) restricted means of entry;

c) not designed for continuous occupancy; d) all of the above are required.

REF : API 2015 1.4 ANS : (d)

150) The determining factor for intervals between internal and external inspections :- (a) Change of service to a higher specific gravity;

(b) Tank service history provided earlier inspection is not required by special reasons;

(c) Corrosion activity either known or suspected. (d) Governmental regulations

REF : API 653, 6.4.2.1 ANS : (b)

151) The difference between peaking and banding is :- (a) peaking pertains to the roof;

(b) banding is external to the tank;

(c) peaking pertains to vertical weld seams, banding pertains to horizontal weld seams;

(d) peaking pertains to horizontal weld seams, banding pertains to vertical weld seams.

REF : General Knowledge

ANS : (c)

152) The first checks for tanks out-of-service are :- (a) (b) and (d) below;

(b) cleaned, gas freed and safe for entry;

(c) hammer test the roof;

(d) complete isolation. REF : API 653 Table C-2.1 a & b

ANS : (a)

153) The flammable range is when a vapour exists :- (a) above the ambient temperature;

(b) between the lower flammable limit and the upper flammable limit; (c) between the extremes of the lower flammable limit;

(d) between the extremes of the upper flammable limit; REF : API 20151.3.10

154) The formula for maximum bulge or depression of a tank bottom is :- (a) B = 0.37 R, gives an Answer in feet;

(b) B = 0.37 R gives an Answer in inches; (c) B + 0.37" is the minimum;

(d) B = 0.37 + R REF : API 653, B.3.3 ANS : (d)

155) The general shape of gas cavities on a radiograph :

(a) appear darker in contrast with areas of defect-free material; (b) are generally round in shape;

(c) are acceptable; (d) both a and b.

REF : General Knowledge

ANS : (d)

156) The Heat Affected Zone is :-

(a) that portion of the base metal which has not been melted;

(b) whose mechanical properties or micro structures have been altered by the heat of welding;

(c) is least likely to contain discontinuities; (d) both (a) and (b) above.

REF : ASME Section IX, QW-492 ANS : (d)

157) The inspection interval for a tank is determined by :-

(a) size; (b) service history; (b) the manufacturer; (d) type of tank. REF : API 653, 6.2.2

ANS : (b)

158) The lower flammable limit (LFL) is the concentration of a glammable vapour in air that will ignite :-

(a) approximate; (b) maximum; (c) average; (d) minimum.

REF : 2015 1.3.1 ANS : (d)

159) The maximum acceptable undercutting for base metal in repaired or altered horizontal welds is :-

(a) 1/64"; (b) 1/32"; (c) 1/16"; (d) 1/8" REF : API-653, 10.4.2.5

ANS : (b)

160) The maximum acceptable undercutting for base metal in vertical welds is :- (a) 1/64"; (b) 1/32"; (c) 1/16"; (d) 1/8,

REF : API-653, 10.4.2.5

ANS : (a)

161) The maximum interval between internal inspections shall not exceed ____ years :-

(a) 10; (b) 20; (c) 5; (d) 15.

REF : API 653, 6.4.2.1 ANS : (b)

162) The maximum spacing between settlement measurement points shall be :-

(a) 30 ft.; (b) 20 ft.; (c) 40 ft.; (d) 25 ft.

REF : API 653 APP. “B”

ANS : (a)

163) The minimum dimension for replacement shell plate is 12 times t or ____ inches :-

(a) 8; (b) 18; (c) 6; (d) 12.

REF : API 653, 9.2.2.1 ANS : (d)

164) The minimum interval for external inspection by a qualified inspector is ____ years or at the quarter corrosion-rate life of the shell, whichever is less :-

(a) Twenty; (b) Five; (c) Ten; (d) Fifteen.

REF : API-653, 6.3.2.1, 6.4.2.1

165) The minimum size of a fillet weld is which of the following :-

(a) On plate 3/16 inch tick, the weld shall be a full-fillet weld, and on plates more than 3/16 inch thick, the weld thickness shall not be less than 1/3 the thickness of the thinner plate at the joint and shall be atleast 3/16 inch.

(b) On plate 5/16 inch thick, the weld shall be a full-fillet weld, and on plates more than 5/16 inch thick, the weld thickness shall not be less than 1/3 the thickness of the thinner plate at hte joint and shall be atleast 3/16 inch.

(c) On plate 3/16 inch thick, the weld shall be a full-fillet weld, and on plates more than 5/16 inch thick, the weld thickness shall not be less than 1/3 the thickness of the thinner plate at the joint and shall be atleast 5/16 inch.

(d) On plate 1/4 inch thick, the weld thickness shall not be less than 1/3 the thickness of the thinner plate at the joint and shall be atleast 1/4 inch.

REF : API-650 3.1.3.3

ANS : (a)

166) The minimum thickness of an annular plate ring is usually greater than :-

(a) 0.10; (b) 0.25; (c) 0.0625; (d) 0.1875.

REF : API 653 4.4.8.1

ANS : (a)

167) The permissible exposure limit (PEL) is the maximum ____ time-weighed average of any airborne contaminant to which an employee may be exposed :-

(a) 8 hour; (b) 24 hour; (c) 4 hour; (d) 1 hour.

REF : 2015 1.3.8

ANS : (a)

168) The proper method for dismantling tank bottoms that are to be reused shall be cut by:- (a) deseaming of lapwelds;

(b) cutting alongside remaining welds at a minimum of 2 inches from existing welds; (c) cutting alongside remaining welds at a minimum of 3 inches from existing welds; (d) Both (a) and (b) are acceptable.

REF : API 653-10.3.2.1 ANS : (d)

169) The purchaser has not specified the use of 1-foot method for calculating thickness and L/H ≤ 2, therefore, what is the shell plate thickness for the first course for the following tank design?

Height = 40 feet Diameter = 260 feet

Stress @ test condition = 30,000 psi

Specific gravity = 1.0 Course Length = 8 feet

Corrosion Allowance = 0 Joint Efficiency = .0

(a) 1.209"; (b) 1.171"; (c) 0.856"; (d) 1.038" REF : 650 3.6.4.3 Table K-2

ANS : (c)

170) The purpose of electrical grounding of A/C power connections is :-

(a) protect against lightening; (b) corrosion control for tank bottoms;

(c) personal safety; (d) corrosion control for tank shells;

REF : API 651, 1.1.1

ANS : (c)

171) The root opening for square grooves for butt-welded bottom plate shall not be less than :-

(a) 1/2 inch; (b) 1/4 inch; (c) 3/16 inch; (d) 9/32 inch.

REF : API 650 – 3.1.5.5

ANS : (b)

172) The sequence of welding of the shell-to-bottom :- (a) is the welder's option;

(b) is not addressed;

(c) is completed after the bottom joints are fully welded; (d) must be completed before the welding of bottom joints. REF : API-653, 10.4.3.2

ANS : (d)

173) The shell plate formula tmin =

(a) only (b) and (c) below; (b) is only valid if tmin is not les than 0.1";

(c) applies only to tanks less than 200' in dia; (d) does not apply to riveted construction. REF : API 653 4.3.3.1

174) The tank shall be cleaned and ____ prior to commencement of dismantling :-

(a) gas-freed; (b) inspected; (c) surveyed; (d) cleaned;

REF : API-653, - 10.2

ANS : (a)

175) The thickness to be used for each shell course when checking the tank design after

reconstruction shall be based on measurements taken within ____ days prior to relocation :-

(a) 45; (b) 90; (c) 180; (d) 360.

REF : API-653, 8.4.1

ANS : (c)

176) The types of tanks covered by API 653 are :-

(a) non-refrigerated;

(b) vertical, cylindrical, above ground closed and open top; (c) built to API 650 and 12 C;

(d) All of the above.

REF : API 650-1.1.1 and 653-3.1.1 ANS : (d)

177) The upper flammable limit (UFL) is the concentration of a flammable vapour in air that will ignite :-

(a) approximate; (b) maximum; (c) average; (d) minimum.

REF : 2015 1.3.2

ANS : (b)

178) The variable design point method shall be used for tanks greater than ____ in diameter :-

(a) 50'; (b) 200'; (c) 150'; (d) 200'.

REF : API-653, 2.3.3.3

ANS : (d)

179) Thick-film internal linings :-

(a) are frequently used as an alternative to replacing the steel bottom; (b) are prohibited from use as an alternative to replacing the steel bottom; (c) removes the need for external cathodic protection;

(d) removes the need for external anodic protection. `REF : API 651 3.4.4

180) Thickness readings taken on a tank shell after 5 years of service show a minimum thickness of 0.420 inches. The data sheet shows the original thickness as 0.5 inches. What is the corrosion rate for the tank :-

(a) 0.008; (b) 0.0016; (c) 0.016; (d) 0

REF : API-653 6.3.3.22

ANS : (c)

181) Three different methods of conducting "Visual Examinations" (VT) :- (a) Direct, indirect and previously recorded;

(b) Translucent, direct and previously recorded;

(c) Translucent, direct and indirect or (remote visual examination) (d) all of the above.

REF : ASME Sec. V, T940, T941, T942, T943

ANS : (c)

182) Three types of external inspections are :-

(a) scheduled, routine and liquid penetrant; (b) scheduled, routine and UT thickness;

(c) scheduled out of service, routine and UT thickness; (d) unscheduled, routine and liquid penetrant.

REF : API 653-6.3.1, 6.3.2 & 6.3.3

ANS : (b)

183) To be an alteration a nozzle must be :-

(a) 12" or greater NPS nozzles; (b) greater than 12" NPS nozzles; (c) greater than 2" NPS nozzles; (d) greater than 10" NPS nozzles. REF : API 653, 3.5.1 (a)

184) To be certified under the program which of the following educational and experience requirements must be met :-

(a) A degree in engineering plus 6 months of experience in inspection of tanks, pressure vessels, or piping;

(b) A two-year certificate in engineering or technical college and two years of experience in construction, repair, operation, or inspection of tanks, pressure vessels or piping;

(c) The equivalent of a high school education and three years of experience in construction, repair, operation or inspection of which one year must be in inspection of tanks, pressure vessels or piping;

(d) Four years of experience in the inspection of above ground storage tanks in petroleum / chemical industries.

REF : API 653, 6.10

ANS : (c)

185) To evaluate tank settlement, elevation measurements are performed and compared with measurements marked just after construction. Where are these measurements made ?

(a) Tank circumference, tank height; (b) Tank diameter, tank height;

(c) Tank height, tank base; (d) Tank circumference, tank diameter.

REF : API-653, Appendix B.2.

ANS : (d)

186) To qualify a GMAW, short circuit transfer, welding procedure :- (a) Radiography may be used;

(b) Tension tests and transverse bend test are required;

(c) May be omitted if another manufacturer has a qualified WPS; (d) Require bend tests only.

REF : ASME Section IX, QW-202.1 ANS : (b)

187) Top decks of external floating roofs (double deck or pontoon type) which are designed with are designed with a permanent slope for drainage shall have a minimum slope of ____ inch in 12 inches :-

(a) 3/16; (b) 1/2; (c) 1/4; (d) 3/8.

REF : API-650 APP-C C.3.3.4

188) Under-run on plate not more than inch from the computed design thickness or minimum permitted thickness is acceptable :-

(a) 0.01; (b) 0.02; (c) 0.03; (d) 0.04.

REF : API 650, 2.2.1.2.3

ANS : (a)

189) Unless otherwise agreed to by the purchaser, what is the minimum nominal width of a shell plate ?

(a) 36 inches; (b) 48 inches; (c) 72 inches; (d) 96 inches.

REF : 650 3.6.1.2

ANS : (c)

190) UT examination methods shall be in acordance with :- (a) ASME Code Section V, Article 5;

(b) ASME Code Section II, Article 5;

(c) API 653;

(d) ASME Code Section IX, Article 2. REF : API 650 6.3.1

ANS : (a)

191) Vertical welds must be fully radiographed if the shell thickness exceeds inches :-

(a) 3/4; (b) 1; (c) 1 1/4; (d) 1 1/2.

REF : API-650 6.1.2.2 (C)

ANS : (b)

192) Visual examination shall be done in accordance with :- (a) ASME Section V, Article 9;

(b) API 650;

(c) AWS Guidelines;

(d) ASME B-31.1, Chapter VI. REF : API 650 5.2.1.8 & 6.5

193) Welded joints that have experienced metal loss due to corrosion :- (a) must be X-Rayed prior to further use;

(b) may be repaired by welding; (c) may be repaired by grinding; (d) all of the above.

REF : API 653, 9.5.3 ANS : (b)

194) Welder identification is not required for :-

(a) lap welds; (b) corner joints;

(c) fillet welds around opening; (d) roof plate welds. REF : API 650 7.4

ANS : (d)

195) Welder or welding operator's identification marks shall be located adjacent to completed welds at intervals not exceeding :-

(a) 9 feet; (b) 6 feet; (c) 3 feet;

(d) As identified on the approved welding procedure specification. REF : API 653 – 11.2.1

ANS : (c)

196) Welders qualifications shall expire as they do not weld :- (a) within a given process for a 6 month period; (b) using a given procedure for a 6 month period; (c) on a tank for 6 months;

(d) for a 3 month period. REF : ASME Sec IX QW-322 ANS : (a)

197) Welding filler metals are grouped into groupings based on their AWS classification:-

(a) P-numbers; (b) F-numbers;

(c) Z-numbers; (d) ASTM spec.

REF : ASME Sec IX QW-432 ANS : (b)

198) Welding Procedure Specifications (WPS), and welders and welding operators must be qualified in accordance with ____ :-

(a) API-653; (b) API-650;

(c) Section V of the ASME; (d) Section IX of the ASME

REF : API-653, 11.1.1 ANS : (d)

199) Welding procedures are qualified in accordance with ____

(a) ASME Section IX, Art. 3; (b) ASME Section V, Art. 2;

(c) ASME Section IX, Art. 2; (d) AWS D-1.1

REF : ASME IX Article 2 ANS : (c)

200) Why are penetrameters used for? :-

(a) A penetrameter is used for evaluating radiographic technique in that it serves as an image quality indicator;

(b) It indicates the magnetic properties of the materials; (c) Is the same as penetration in Ultrasonic Inspection; (d) both (a) and (c) above.

REF : ASME SECTION V, T233, T262

ANS : (a)

201) What are the two general approaches for determining minimum thicknesses of tank bottom plate and briefly describe their differences :-

(a) Deterministic and Probabilistic; (b) Probabilistic and Actualistic; (c) Actualistic and Deterministic;

(d) Variable design and Actual thickness determination. REF : API-653, 4.4.7

ANS : (a)

202) What are the two methods of guided-bend tests permitted by ASME Section IX ? (a) Bottom ejection method and Wrap around method;

(b) Top ejection method and Bottom ejection method; (c) Side ejection method and Wrap around method; (d) All to the above.

203) What diameter bolt circle is required and how many bolts for a 24 inch roof manhole? (a) 26.0 inch diameter bolt circle and 18 bolts;

(b) 25.5 inch diameter bolt circle and 20 bolts; (c) 27.5 inch diameter bolt circle and 16 bolts; (d) 27.5 inch diameter bolt circle and 20 bolts. REF : API 650 – 3.8.4

ANS : (d)

204) What F number is E70T1 electrodes classified as :-

(a) 1; (b) 2; (c) 4; (d) 6.

REF : ASME Sec IX,QW-432

ANS : (d)

205) What is calcination :-

(a) An accumulation of a mineral coating on the lining of the tank; (b) Increase of water of hydration;

(c) Loss of water of hydration; (d) Form of tank deterioration. REF : API-653, 4.5.1.2

ANS : (c)

206) What is meant by "non destructive examination" of a welded joint ?

(a) An examination of a welded joint that will disclose surface and sub-surface discontinuities without physical harm to the welded joint;

(b) An examination of a bolted joint;

(c) An examination of a welded joint that will disclose surface and sub-surface discontinuities that may cause physical harm to the welded joint.

(d) An examination of a welded joint that will disclose only surface discontinuities without physical harm to the welded joint.

REF : ASME Section V, T110

ANS : (a)

207) What is MRT2 as used by the deterministic method ?

(a) Minimum remaining thickness due to maximum internal pitting and average external pitting;

(b) Maximum remaining thickness that can be used for calculations; (c) Maximum reported thickness minus all corrosion;

(d) Min remaining thickness due to average internal pitting and max external pitting. REF : API 653, 4.4.7.1

208) What is the 42 gallon barrel capacity of a tank 110 feet in diameter, 24 feet high, joint efficiency is 0.85, specific gravity = 1.0, corrosion allowance = 0.

(a) 34,303; (b) 38,909; (c) 39,910; (d) 40,656.

REF : API 650 – Appendix A Table A-1 C = 0.14D2_H

ANS : (d)

209) What is the allowable stress at root of anchor bolt threads for a tank with a design pressure up to 2.5 psig ? Uplift is based on tank design pressure and wind.

(a) 15,000; (b) 20,000; (c) 25,000; (d) 30,000.

REF : API 650 – F.7, Table F-1

ANS : (b)

210) What is the capacity of a tank 110 feet in diameter, 24 feet high, joint efficiency is 0.85, specific gravity is 1.0, corrosion allowance = 0 ?

(a) 34,303; (b) 38,909; (c) 39,910; (d) 40,656.

REF : API 650 Table A-1 ANS : (d)

211) What is the distance from the centre pipe to shell for a 3 inch nominal pipe size, 36 diameter drawoff sump, which is 18 inched deep ?

(a) 2.1875'; (b) 3.2343'; (c) 5.0000'; (d) 5.3780'

REF : API 650 - 3.8.6

ANS : (c)

212) What is the distance in inches, that both a roof plate or a shell bottom must be cut from the weld when dismantling a shell tank :-

(a) One; (b) Two; (c) Four; (d) Six.

REF : API-653, 10.3.2; API-653, 10.3.4.1

ANS : (b)

213) What is the expected service life for a properly applied tank bottom lining ? (a) 5 – 10 years; (b) 10 – 15 years;

214) What is the flammable range for Methane ?

(a) 1 – 5; (b) 2 – 8; (c) 2 – 9; (d) 5 – 15.

REF : 2015 – 3.2 (Table – 1) ANS : (d)

215) What is the maximum acceptable undercutting of new constructed base metal for vertical butt joints?

(a) 1/4 inch; (b) 1/8 inch; (c) 9/32 inch; (d) 1/64 inch. REF : API 650 - 5.2.1.4

ANS : (d)

216) What is the maximum acceptable undercutting of new construction base metal for horizontal joints ?

(a) 1/4 inch; (b) 1/8 inch; (c) 1/32 inch; (d) 1/64 inch. REF : API 650 – 5.2.1.4

ANS : (c)

217) What is the maximum depth of a depreciation, oval in shape, which measures 18 feet long by 11 feet wide?

(a) 6.6"; (b) 24.42"; (c) 4.07"; (d) 2.035". REF : API 653 APP. “B” B-5

ANS : (d)

218) What is the maximum depth of edge settlement if the distance from the inside of the shell to the bend point of the depression is 7 feet ?

(a) 2.59"; (b) 1.295"; (c) 5.18"; (d) 31.08". REF : API 653 APP. “B”

ANS : (a)

219) What is the maximum interval between external UT thickness measurements for a tank, given the following information ? Remaining CA = 0.064", Corrosion rate is 0.008" per year.

(a) 5 yrs; (b) 4 yrs; (c) 8 yrs; (d) 3 – 1/2 yrs.

REF : API 653, 6.3.3.2

220) What is the maximum out-of-plumbness of a new tank from the top of shell relative to the bottom of the shell ?

(a) 1/100 of the total tank height; (b) 1/50 of the total tank height; (c) 1/60 of the total tank height; (d) 1/200 of the total tank height. REF : API 650 – 5.5.2

ANS : (d)

221) What is the maximum reinforcement allowed on a 1/2" thick vertical butt weld made on a reconstructed tank ?

(a) 3/16; (b) 3/32; (c) 1/8; (d) 1/4.

REF : API-653, 10.4.2.6 ANS : (b)

222) What is the maximum spacing between settlement measurement points? (a) 20 feet; (b) 30 feet; (c) 35 feet; (d) 50 feet. REF : API 653 – 12.5.1.2

ANS : (b)

223) What is the maximum thickness of weld reinforcement for a 0.5625 inch plate ?

(a) 1/16; (b) 3/32; (c) 1/8; (d) 3/16.

REF : API 650 – 6.1.3.4

ANS : (b)

224) What is the minimum acceptable shell plate thickness for a tank shell made of A 283 grade C material, 70 feet in diameter and 50 feet high ? Specific gravity of contents is 0.8. Original joint efficiency was 100 %.

(a) 0.356; (b) 0.339; (c) 0.480; (d) 0.304.

REF : API-653, 4.3.3.1

ANS : (d)

225) What is the minimum allowable density through the image of the penetrameter for radiographs made with a 2000 kv tube ?

226) Windgirders are evaluated for :-

(a) Corrosion of structural elements; (b) attachment welds;

(c) the same evaluation as for shell stiffeners; (d) all of the above. REF : API 653, 4.3.7

ANS : (d)

227) What is the minimum nominal shell thickness required when the normal tank diameter is less than 50 feet?

(a) 3/16; (b) 1/4; (c) 5/16; (d) 3/8.

REF : API-650 3.6.1.1

ANS : (a)

228) What is the minimum nominal thickness for bottom plates, exclusive of any corrosion allowance?

(a) 3/16 inch; (b) 1/4 inch; (c) 5/16 inch; (d) 7/16 inch. REF : API 650, 3.4.1

ANS : (b)

229) What is the minimum number of settlement measurement points ?

(a) 4; (b) 6; (b) 8; (d) 10.

REF : API 653 – 12.5.1.2

ANS : (c)

230) What is the minimum permissible design metal temperature for a 280 foot diameter tank, 75 feet high, tank radius is 1,680 inches, plate material ordered is 1.125" (including corrosion allowance) A 516 – 555 as rolled, killed fine-grain practice without impact testing :-

(a) + 8; (b) 0;

(c) – 4; (d) All Material must be impact tested. REF :API 650 - 2.2.9.2 (Fig. 2-1)

ANS : (c)

231) What it the minimum permitted density of radiographic film using an Iridium source ?

(a) 2.0; (b) 1.8; (c) 1.3; (d) 4.0

REF : ASME Sec V-T282.1

232) What is the minimum required number of settlement measurement points for a 200' diameter tank ?

(a) 10; (b) 8; (c) 21; (d) 20.

REF : API 653 – 12.5.1.2

ANS : (c)

233) What is the minimum thickness of bolting flange and cover plate for a 24 × 24 size flush-type cleanout to be installed in a tank having maximum h eight of 53 feet :-

(a) 1/16; (b) 1/8; (c) 3/16; (d) 9/16.

REF : API 650 – 3.7.7 (Table 3-12) ANS : (d)

234) What is the calculated minimum thickness of shell plates from the stress on vertical joints for a field-erected small capacity tank, which has a diameter of 30 feet, height of 36 feet, joint efficiency is 0.85, specific gravity is 1.0, with a corrosion allowance of 0.125 ?

(a) t = 0.1529; (b) t = 0.1875; (c) t = 0.2779; (d) t = 0.3125. REF : API 650 – A.4 (See 3.6.1.1)

ANS : (c)

235) What is the minimum weld length that must be shown on

each radiograph ?

(a) 2 inches; (b) 3 inches; (c) 4 inches; (d) 5 inches. REF : API 650 – 6.1.2.8

ANS : (b)

236) What is the most common protective cushion for aboveground storage tanks ?

(a) Clean sand; (b) Clay; (c) Gravel; (d) Carbonaceous.

REF : API – 651, Section 3

237) What is the nominal shell thickness required when the nominal tank diameter is less than 50 feet ?

(a) 3/16 inch; (b) 1/4 inch; (c) 5/16 inch; (d) 3/8 inch. REF : API 650 3.6.1.1

ANS : (a)

238) What is the radii tolerance measured at 1 foot above the shell to bottom for a reconstructed 125 foot diameter tank ?

(a) +/- 1/2; (b) +/- 3/4; (c) +/- 1; (d) +/- 1 1/4. REF : API 653, 10.5.3

ANS : (b)

239) What is the title of API Publication 2015A ?

(a) "Guide for Controlling the Lead Hazard Associated with Tank Entry and Cleaning."

(b) "Cleaning Open-Top and Covered Floating-Roof Tanks"

(c) "Guidelines for Confined Space Work in the Petroleum Industry" (d) "Welded Steel Tanks for Oil Storage"

REF : API-653, 3.6 ANS : (a)

240) What must be done to the tank prior to dismantling to insure proper alignment after the tank is reconstructed ?

(a) Atleast four sets of matching centre punch marks should be placed at the top and bottom edges of each shell plate.

(b) Atleast two sets of matching centre punch marks shall be placed at the top and bottom edges of each shell plate.

(c) Atleast three alignment tabs shall be tack welded to the top and bottom edges of the each shell plate.

(d) Atleast two sets of matching centre punch marks may be placed at the top and side edges of each shell plate.

REF : API-653, 10.3.5.2