Professional Training and onsultation 8 th Floor Al-Subeaei Towers King Abdulaziz cor. Prince Faisal Bin Fadh Streets Al-Khobar Saudi Arabia [email protected]●www.gotoITC.com1 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 INDEXAPI 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.
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
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 toeach question. To best prepare for the course and the examination, you shouldstrive to memorize these questions and answers.
REFERENCE INDEX
API 650 Welded Steel Tanks for Oil Storage
API 651 Cathodic Protection of Aboveground Petroleum StorageTanks
API 652 Lining of Aboveground Petroleum Storage Tank Bottoms
API 653 Tank Inspection, Repair, Alteration and Reconstruction
1) __________ is a change from previous operating conditions involvingdifferent properties of the stored product such as specific gravity or
corrosivity and / or different service conditions of temperature and / orpressure"
(a) Re-rating; (b) Change in service;(c) Repair; (d) Reconstruction
REF : API-653, - 1.5.4
ANS : (b)
2) A __________ is a device used to determine the image quality of aradiograph.
(a) A step wedge comparison film; (b) A densitometer;(c) A penetramter (d) All of the above.
REF : 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, 2.2.1.2
ANS : (b)
4) A double-welded butt joint is defined as :-
(a) A joint between two members that intersect at an angle between0 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 jointedmember.(d) A joint between two overlapping members in which the overlappededge is welded.
5) An external floating roof shall be provided with atleast one manhole havinga minimum inside diameter of __________ inches.
(a) 18; (b) 15; (c) 24; (d) 30.
REF : 650 APP. C. 3.11
ANS : (c)
6) A formal Visual External inspection by a qualified inspector shall be doneatleast :-
(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 : 653 4.3.2.1
ANS : (a)
7) A full hydrostatic test (when required) shall be held for __________ hours:-
(a) 24; (b) 8; (c) 18; (d) 12
REF : 653 10.3.1.1
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 crosssection 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 65oFat time of hot tap, without having material toughness data is :-
(c) not enough information; (d) not addressed by the codeREF : API 653 – 7.13.4 & Fig. 7-5
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 : 653 10.3.1.1 (a)
ANS : (b)
11) A liquid penetrant examiner must have vision to enable him to read JaggerType 2 standard chart at a distance of not less than 12 inches and iscapable of distinguishing and differentiating contrast between coloursused. Examiners shall be checked __________ to ensure that they meetthese requirements :-
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 : IX QW-200.2
ANS : (d)
13) A radiograph is made using an X-ray source and two films in each filmholder. For composite viewing, each film of the composite shall have aminimum density of :-
ANS : (b)14) A reconstructed tank with a total height of 25' has been determined tohave an out-of-plumbness of 2-3/4". This is :-
(a) acceptable; (b) unacceptable;(c) not covered by the code (d) corrected by eternalstrengthening
REF : API-653, 8.5.2.1
ANS : (a)
15) A riveted tank shell with a butt joint has 3 rows. What is the jointefficiency ?
(a) 0.75"; (b) 0.85"; (c) 0.90; (d) 0.91.
REF : API-653, Table 2-1
ANS : (b)
16) A SAW welding operator is attempting to quality by radiography on a 6inch thick test coupon. Elongated slag inclusions are measured to be 0.2inch 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 : 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.
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) aboveREF : API 650 3.1.5.7 c
ANS : (a)
19) A single film technique was used to make a radiograph using a Cobalt-60source. The minimum permitted density in the area of interest is :
(a) 4.0; (b) 1.8; (c) 2.0; (d) 1.3.
REF : Section V, T-282
ANS : (c)
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 testedwith :-
(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;
23) A weld shall be unacceptable by Visal Inspection if the inspection showswhich 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 orhorizontal butt joints.(c) The frequency of surface porosity in the weld does not exceed onecluster (one or more pores) in any four inches of length, and the diameterof each cluster does not exceed 3/32 inch.(d) All of the above;
REF : 650 6.5.1
ANS : (b)
24) A weld with a nominal thickness of 1.5 inch is to be radiographed using afilm side penetrameter, hole type. The penetrameter designation should be:-
(a) 25; (b) 30; (c) 35; (d) Both (a) and (b) areresponsible;
REF : Section V, T-276
ANS : (a)
25) A welder may deviate from the parameters specified in WPS if they arenonessential variables :-
(a) Provided authorisation from inspection is documented;(b) Provided the welding supervisor approves;(c) No;(d) Nonessential variables only apply to PQRs
REF : Section IX, QW-200.1
ANS : (c)
26) A welder qualifies in the 3G position on a plate coupon, he is then qualifiedto weld in the position(s) on NPS 6 pipe :-
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 : Section IX, QW-402.2
ANS : (b)
28) A welder's ID must be placed at intervals not exceeding along completedwelds :-
(a) One foot; (b) One and a half feet; (c) Two feet; (d) Threefeet.
REF : API-653, 9.2.2
ANS : (d)
29) A welding procedure qualified on ¼ inch thick plate can be used to weldgroove 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 : QW-451.1
ANS : (d)
30) A welding procedure qualified on 3/8" thick plate can be used to weldgroove 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.
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 : Section IX Forward
ANS : (b)
32) Above-ground storage tank is defined as a stationary container with abarrel 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
REF :650 6.2.4
ANS : (c)
34) All tanks shall be given a formal visual external inspection by an inspectorat 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-653-4.3.2.1
ANS : (b)
35) An external inspection may be used as an alternative to the internalinspection only when :-
42) Based on variable-design point method, calculate the first coursethickness, exclusive of CA, for a 200 foot diameter tank, purchaser
specified specific gravity of 1, 56 feet in height, using 96 inch courses withmaterial 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 temperaturabove 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.
(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.
(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< 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 igniteflammable vapours;(c) an atmosphere between the LEL and UEL;(d) both (a) and (c) above.
51) Describe how a liquid penetrant examination should be performed in orderto detect discontinuities, which are open to the surface :-
(a) clean the part, apply the developer, apply the penetrant, removeexcess penetrant, inspect the part, clean the part;(b) clean the part, apply the penetrant, remove excess penetrant, apply thedeveloper, inspect the part, clean the part;(c) clean the part, apply the developer, apply the penetrant, inspect thepart, remove excess penetrant, clean the part;(d) clean the part, apply the developer, apply the penetrant, inspect thepart, clean the part.
52) Determine the exact interval for ultrasonic thickness measurements for atank with 17 mils of the original 25 mils corrosion allowance still remaining
53) Determine the maximum allowable height for a 90 foot diameter tank
based on a maximum shell plate thickness of 0.5 inch and maximumallowable stress of 21,000 psi, with a joint efficiency of 0.85, and nocorrosion allowance :-
(a) 29.6; (b) 35.3; (c) 39.1; (d) 43.9
REF : API 650-Table A-4
ANS : (c)
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, 2.5.3
ANS : (c)
56) During an inspection, you are required to calculate the retirementthickness for the bottom course of a tank. The information available is asfollows :-
Specific gravity of contents = 0.77Joint efficiency = 0.7Material tensile strength is unknownMaterial 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 2.3.3.1
ANS : (c)
57) During hydrostatic test, no less than ______ settlementmeasurement points shall be surveyed :-
(a) 8; (b) 10; (c) 15; (d) 5.
REF : 653 10.5.1.2
ANS : (a)
58) E7018 electrodes are classified as F number :-
(a) 1; (b) 2; (c) 4; (d) 5.
REF : IX QW-432
ANS : (c)
59) Essential variable on a welding procedure specification :-
(a) those in which a change, as described in the specific variables, isconsidered to affect the mechanical properties of the weldment;
(b) variable are listed in section IX of the ASME CODE;
60) Examiners who perform ultrasonic examinations under API-650 shall bequalified and certified by the manufacturers as meeting the requirements ofcertification as outlined in ?
(c) internal and external pressure, wind loads, fluid static head, settlementand if it convenient.
(d) only (a) and (b) above.
REF : API 653, 2.3.1.2
ANS : (b)
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 4-1; 4.5
ANS : (c)
65) Find the capacity of a small tank, with a joint efficiency of 0.85, specificgravity = 1.0, no corrosion allowance, diameter is 40 feet, height is 30 feetwith 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;
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, 2.2.3.3
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)
69) For an existing 150 foot diameter storage tank, which has been in servicefor 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 tensilestrength is 55,000, liquid fill level is 50 feet, calculate the minimumallowable thickness for the second course :-
(a) 0.6789; (b) 0.7962; (c) 0.8056; (d) 0.8156.
REF : API 653 2.3.3.1
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 orwelding 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 thedepth of the roof, including the crown and knuckle depth. What is t hemaximum 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 ofGroup 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 a1.8" thick A-516-70 as rolled material for a WPS ?
74) For new or repaired shell horizontal joints, how many radiographs shall betaken for each 50 feet of horizontal joint, not including those required atintersections of vertical and horizontal joints ?
(a) 1; (b) 2; (c) 3; (d) 5.
REF : API 653 – 10.2.1.2
ANS : (a)
75) For welds that attach nozzles, manholes, cleanout openings andpermanent attachments, undercut shall not exceed ______ inch.
(a) 3/32; (b) 1/8; (c) 3/16; (d) 1/64.
REF : 650 6.5.1
ANS : (d)
76) Foundations of relocated tanks specified as true to horizontal planewithout ringwalls 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.
81) How does the calculation of minimum thickness for a riveted tank shelldiffer from that of a welded tank shell :-
(a) The formula for the calculation of minimum thickness of a riveted tankshell is the same as for a welded tank shell except that the maximumallowable stress (S) is 21,000 lbs / sq. inch and the efficiency equals 1 forthe shell plate 6 inches away from rivets;
(b) The formula for the calculation of minimum thickness of a riveted tankshell is exactly the same for a welded tank;
(c) The formula for the calculation of minimum thickness of a riveted tankshell is the same as for a welded tank shell except the minimum allowablestress (S) is 21,000 lbs /s q. inch and the efficiency equals 0.85 for theshell plate 6 inches away from the rivets.
(d) API does not set minimum thickness.
REF : API-653, 2.3.4.1
ANS : (a)
82) How many equally spaced measurement are required for the thicknessaveraging technique ?
(a) 2; (b) 5; (c) 4; (d) 3.
REF : API 653, 2.3.2.1
ANS : (b)
83) How many impact specimens must be broken for an average value for P1,Group 1, 2, 3 material ?
(b) Ensure that the bottom is not corroded and leaking;
(c) Gather data for assessment;
(d) Identify and evaluate bottom settlement.
REF : API – 653, 4.4.1
ANS : (a)
106) Intervals between internal inspections shall be determined by thecorrosion rate. Normally, bottom corrosion rates control the inspectioninterval. However, in no case shall the interval inspection interval exceed ____ years :-
(a) 10; (b) 15; (c) 20; (d) 25.
REF : API 653 – 4.4.2.1
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 : 650 8.1.1
ANS : (a)
108) Liquid penetrant examiners shall be qualified in accordance with ____ :-
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 : 653 2.3.3.2
ANS : (d)
113) Acceptance criteria for NDT of reconstructed tanks are to be inaccordance 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 weldingon above ground storage tanks :-
(a) SMAW; (b) GMAW; (c) OFW; (d) SAW.
REF : 650 5.2.1.1
ANS : (c)
115) On plates more than 3/16 inch thick, the fillet weld thickness shall not beless than 1/3 the thickness of the thinner plat at the joint and shall beatleast :-
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 : 650 6.1.5
ANS : (a)
128) Reinforcement pads shall be tested by applying pressure between thetank shell and reinforcement plate using the telltale hole. How muchpressure is used to perform this inspection :-
(c) may be welded over and left as is without reinspection;
(d) both (b) and (c) above.
REF : API-653, 2.3.6
ANS : (b)
130) Resistivity of surrounding soil may be used to determine the probability ofcorrosion on tank bottoms. Which of the following resistivity ranges isconsidered to be very corosive :-
(c) by a certified electrician; (d) need no inspection.
REF : API 653, 4.3.2.4
ANS : (a)
141) Tanks reconstructed in accordance to API-653 shall be identified with acorrosion-resistant metal nameplate with letters not less than ____" high :-
(a) 5/32; (b) 7/32; (c) 9/32; (d) 3/32.
REF :-653, 11.1.1
ANS : (a)
142) Tests for leaks in reinforcing plate welds require ____ psig :-
143) The "critical zone" for tank bottom repairs is the area within the annularplate ring, within inches of the shell or within inches of the inside edge ofthe annular plate ring:-
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, 2.3.2.1 See Note
ANS : (c)
145) The 6 G position for welding is a :-
(a) Qualification position; (b) Production welding position;
(c) Rod position; (d) Rank position.
REF : IX QW-120
ANS : (a)
146) The API 653 standard covers the maintenance inspection, repairs,alteration, relocation and reconstruction of tanks constructed to which oneof the following standards :-
(a) ASME; (b) API 651; (c) API 65; (d) API 650.
REF : 653 1.1.1
ANS : (d)
147) The assessment period for inspection of tank bottom integrity is :-
161) The maximum interval between internal inspections shall not exceed ____years :-
(a) 10; (b) 20; (c) 5; (d) 15.
REF : 653 4.4.2.1
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 : 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 7.2.2.1
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 :-
165) The minimum size of a fillet weld is which of the following :-
(a) On plate 3/16 inch thick, the weld shall be a full-fillet weld, and onplates more than 3/16 inch thick, the weld thickness shall not be less than1/3 the thickness of the thinner plate at the joint and shall be atleast 3/16inch.
(b) On plate 5/16 inch thick, the weld shall be a full-fillet weld, and onplates more than 5/16 inch thick, the weld thickness shall not be less than1/3 the thickness of the thinner plate at hte joint and shall be atleast 3/16inch.
(c) On plate 3/16 inch thick, the weld shall be a full-fillet weld, and onplates more than 5/16 inch thick, the weld thickness shall not be less than1/3 the thickness of the thinner plate at the joint and shall be atleast 5/16inch.
(d) On plate 1/4 inch thick, the weld thickness shall not be less than 1/3the 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 : 653 2.4.8.1 ANS : (a)
167) The permissible exposure limit (PEL) is the maximum ____ time-weighedaverage of any airborne contaminant to which an employee may beexposed :-
175) The thickness to be used for each shell course when checking the tankdesign after reconstruction shall be based on measurements taken within ____ days prior to relocation :-
(a) 45; (b) 90; (c) 180; (d) 360.
REF : API-653, 6.4.1
ANS : (c)
176) The types of tanks covered by API 653 are :-
(a) non-refrigerated;
(b) vertical, cylindrical, above ground closed and open top;
(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, 1.5.1 (a)
ANS : (b)
184) To be certified under the program which of the following educational andexperience requirements must be met :-
(a) A degree in engineering plus 6 months of experience in inspection oftanks, pressure vessels, or piping;
(b) A two-year certificate in engineering or technical college and two yearsof experience in construction, repair, operation, or inspection of tanks,pressure vessels or piping;
(c) The equivalent of a high school education and three years ofexperience in construction, repair, operation or inspection of which oneyear must be in inspection of tanks, pressure vessels or piping;
(d) Four years of experience in the inspection of above ground storagetanks in petroleum / chemical industries.
REF : 653 4.10
ANS : (c)
185) To evaluate tank settlement, elevation measurements are performed andcompared with measurements marked just after construction. Where arethese measurements made ?
(a) Tank circumference, tank height; (b) Tank diameter, tankheight;
(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 :-
(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 surfacediscontinuities without physical harm to the welded joint.
REF : Section V, T110
ANS : (a)
207) What is MRT2 as used by the deterministic method ?
(a) Minimum remaining thickness due to maximum internal pitting andaverage external pitting;
(b) Maximum remaining thickness that can be used for calculations;
(c) Maximum reported thickness minus all corrosion;
(d) Minimum remaining thickness due to average internal p itting andmaximum external pitting.
REF : 2.4.7.1
ANS : (a)
208) What is the 42 gallon barrel capacity of a tank 110 feet in diameter, 24 feethigh, 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 = 0.14D2H
ANS : (d)
209) What is the allowable stress at root of anchor bolt threads for a tank with adesign pressure upto 2.5 psig ? Uplift is based on tank design pressureand wind.
224) What is the minimum acceptable shell plate thickness for a tank shellmade 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 2.3.3.1
ANS : (d)
225) What is the minimum allowable density through the image of thepenetrameter for radiographs made with a 2000 kv tube ?
229) What is the minimum number of settlement measurement points ?
(a) 4; (b) 6; (b) 8; (d) 10.
REF : API 653 – 10.5.1.2
ANS : (c)
230) What is the minimum permissible design metal temperature for a 280 footdiameter tank, 75 feet high, tank radius is 1,680 inches, plate materialordered 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 anIridium source ?
232) What is the minimum required number of settlement measurement pointsfor a 200' diameter tank ?
(a) 10; (b) 8; (c) 21; (d) 20.
REF : API 653 – 10.5.1.2
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 height 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 stresson vertical joints for a field-erected small capacity tank, which has adiameter of 30 feet, height of 36 feet, joint efficiency is 0.85, specificgravity 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
250) When changing a non-essential variable on a welding procedure, theprocedure must be :-
(a) revised; (b) requalified;
(c) no action required; (d) re-written as a new procedure.
REF : IX QW-200.1 ANS : (a)
251) When concrete ringwalls are provided under the shell, the top of theringwall shall be level with ______ inch in the total circumferencemeasured from the average elevation :-
(a) 1/4; (b) 1/8; (c) 3/8; (d) 5/16.
REF : API 650 – 5.5.5.2 a
ANS : (a)
252) When determining average thickness in a corroded area of a shell, aminimum of equally paced measurements shall be taken over a length ofL.
(a) 10; (b) 5; (c) 8; (d) 6.
REF : 653 2.3.2.1 (c)
ANS : (b)
253) When evaluating roof support systems, special attention should be paid to:
256) When preparing the surface for lining, the abrasive blasting should not beperformed if the temperature of the steel surface is less than ____ abovethe dew point or if the relative humidity is greater than ____ %.
261) When reviewing a radiograph, a dark image of the letter B can be seen onthe film
(a) This is cause for rejection;
(b) This is not cause for rejection;
(c) This is the same as a light letter B;
(d) An unusual safety hazard existed during the exposure.
REF : Section V, T-284
ANS : (b)
262) When the corrosion rate is not known or determinable from similar serviceexperience, actual bottom plate thickness shall be determined byinspection within the next ____ years of operation :-
(a) 10; (b) 7; (c) 5; (d) 3.
REF : 653 4.4.2.2
ANS : (a)
263) When the tank is out of service, additional bottom plate examination
includes :-
(a) All of the below; (b) ultrasonic;
(c) hammer testing; (d) turning of coupons.
REF : API 653 Appendix C, C.1.1.4
ANS : (a)
264) When two (2) welders weld opposite sides of the same butt joint :-
(a) 2 spot radiographs shall be taken;
(b) heat generated by twin arc removes the need to radiograph;
268) When vacuum testing is performed, a partial vacuum of at least psigshould be used :-
(a) 2; (b) 3; (c) 4; (d) 5.
REF : 650 5.3.3.4
ANS : (a)
269) Which below best describes how surfaces shall be prepared for Ultrasonicexamination :-
(a) The finished contact surfaces shall be free from weld splatter and anyroughness that would interfere with free movement of the search unit orimpair the transmission of ultrasonic vibrations;
(b) The weld surfaces shall be finished so they cannot mask or beconfused with reflections from defects, and should merge smoothly intothe surfaces of the adjacent base materials;
(c) The volume of base material through which the sound will travel in
angle beam examination shall be completely scanned with a straight beamsearch unit to detect reflectors which might affect interpretation of anglebeam results;
(d) all of the above.
REF : Section V, T-542.7.1
ANS : (d)
270) Which below option Thin-Film lining system shall be used for the following
service conditions; Temperature 200 degrees F, product contents aredistillates,
(c) Weld Testing Laboratory; (d) A qualified welder
REF : IX QW-200.1
ANS : (b)
288) Who is responsible for qualifying the welders used to repair an aboveground storage tank ?
(a) The tank manufacturer; (b) The repair concern;
(c) The inspector; (d) The test laboratory.
REF : IX QW-103.1
ANS : (b)
289) Who is responsible for stating the design metal temperature (based onambient temperatures), the design specific gravity, the corrosion
allowance (if any), and the design wind velocity ?
(a) PURCHASER; (b) FABRICATOR;
(c) INSPECTOR; (d) ERECTOR.
REF : 650 XIII
ANS : (a)
290) Widely scattered pits may be ignored provided that the sum of theirdimensions along any vertical line does not exceed 2 inch in an 8 inchlength and no pit depth results in a shell thickness of less than of theminimum thickness exclusive of corrosion allowance :-