Exam Type
:
Course Title :
PRE-TEST API 653: TANK INSPECTION CODE: Inspection, Repair, Alteration & Reconstruction of Steel Aboveground Storage Tanks Used in the Petrochemical Industry
(API Exam Preparation Training) C.Nataraj
[email protected]
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Open Book 1. The liquid penetrant examination method is an effective means for detecting _______. a. b. c. d.
internal discontinuities of a weld surface discontinuities of a weld both internal and surface discontinuities of a weld subsurface discontinuities of a weld
2. A WPS is a written qualified welding procedure prepared to ________. a. b. c. d.
provide direction provide direction provide direction provide direction
for for for for
making production welds to Code requirements the welder to make temporary welds the inspector for inspection of the welds the welder to use as a general guideline
3. Welding in the 3G position qualifies a welder in what positions? a. b. c. d.
Flat and horizontal Horizontal and vertical Flat and vertical Vertical and overhead
4. Which of the following is an essential variable for the WPS? a. b. c. d.
A change in groove design A change in backing A change in post weld heat treatment A change in electrode angle
5. A welder may be qualified by RT if ___________. a. the welder uses SMAW b. the welder uses GMAW Short Circuiting mode c. the welder uses GMAW Short Circuiting mode root pass with SMAW fill and reinforcement d. the welder obtains approval from the inspector
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6. A peripheral seal, on an internal floating roof, shall be designed to accommodate ______ of local deviation between the floating roof and the shell. a. b. c. d.
the manufacturer’s standard ±4 inches ±1/8inch inspector’s experience
7. What is the maximum allowable prod spacing using an AC prod technique? a. b. c. d.
t/2 8 inches 10 inches No spacing required
8. Welders that weld tank shell vertical joints shall be qualified in accordance with______. a. b. c. d.
API 11O4 ASME Section V ASME Section IX AWS D1.1
9. Geometric unsharpness of the radiograph of a component under 2” thick shall not exceed __________. a. b. c. d.
0.020 0.030 0.040 0.050
10. For measuring the thickness of materials using the contact pulse-echo method, temperatures are not to exceed________. a. b. c. d.
200°F 93°C both 1 and 2 50°F
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11. Each piece of magnetizing equipment shall be calibrated ___________. a. at the beginning of each shift b. at least once a year or whenever the equipment has been subject to major electrical repair c. whenever the technician feels like it d. at least once every 90 days 12. During calibration of an ammeter the unit shall not deviate by more than ____ of full scale. a. b. c. d.
10% 20% 30% 40%
13. An inspector is evaluating a radiograph, a bright white image of a “B” appears on a darker background of the radiograph, __________. a. b. c. d.
the radiograph shall be considered unacceptable the radiograph should not be rejected the “B” is for identification of the welder the “B” is for identification of the weld
14. Ultrasonic examination of hot tap connections or reinforcement is required by API 653 when _______. a. b. c. d.
in lieu of radiographic testing searching for weld flaws searching for laminations requested by the welder
15. During an internal inspection of a tank, pitting that measures 0.30 inches deep was found in the shell (0.625 Thickness). The required thickness of the shell in this area is 0.5 inches. Based on the above information should a repair be made? a. b. c. d.
Yes No The inspector option Repair contractor’s option
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The following applies to questions 16 through 25 below: An inspection is performed on an AST 24’ tall, 22’ fill height, 94’ diameter, water storage service, earth foundation. There is one area of general internal corrosion on the south side of the shell 20” wide and 20” in vertical length. There is evidence of bottom settlement. 16. Calculate the minimum thickness of the first course based on product alone. a. b. c. d.
1.175” 0.228” 0.551” 0.217”
17. Calculate the minimum thickness for the third course, if each course is 4’ in height. a. b. c. d.
.122” .100” .275” .132”
18. Calculate the “L” length for an area of general corrosion found 10’ from the bottom on the south side of the shell, T2= .125”. a. b. c. d.
40” 12.68” 680” 11.75”
19. There are three pits aligned vertically on the north side of the tank, in the first course. The diameter of the pits are 1 .250”, 1 “, and .500” in length along a vertical line 8” long. Note: Assume pit depth of slightly less than one-half of the minimum acceptable tank shell thickness, exclusive of the corrosion allowance. a. b. c. d.
Because the pits are aligned vertically no repair is required Scattered pits may be ignored If the pit is round, it may be ignored A repair is required
20. Three circumferentially scattered pits are located on the west side of the tank 18” from the bottom. The pits measure .500”, .477” and .732” in diameter. Note: Assume pit depth of one-half of the minimum acceptable tank shell thickness, exclusive of the corrosion allowance. a. b. c. d.
Because the pits are scattered circumferentially no repair is required All pits may be ignored If the pit is round, it may be ignored A repair is required
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21. A bulge is found on the tank floor, the diameter of the bulge is 30”. What is the maximum permissible height for the bulge? a. b. c. d.
11.1” .460” .962” 1.11”
22. An area of edge settlement in the tank bottom 6’ from the shell has sloped down and settled. The settlement measures 2” at the deepest point. (The bottom lap welds are approximately parallel to the shell). a. b. c. d.
A more rigorous stress analysis must be performed The area should be repaired Sloped edge settlement is usually no problem The area should be documented and checked during the next inspection
23. What is the hydrostatic test height of this tank based on a minimum thickness found in question 16, as the controlling thickness? a. b. c. d.
24’ 34.2’ 18.6’ Not enough information given
24. A depression is noted on a section of the bottom near the middle of the east quadrant. The depression measures 5/8” deep, with a diameter of 36 inches. Should a repair be recommended? a. b. c. d.
Yes No Not enough information given The tank holds water, no problem
25. If the maximum liquid level in the tank were to be lowered by 5’, what is the minimum thickness of the first course? a. b. c. d.
1.73” .166” .200” No change from original design thickness
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The following applies to questions 26 through 27 below: Or RTbC RTip StPr UPr
= = = = =
10 years .200 .190 .002 .010
26. Using data from above, calculate MRT. (metal loss from the bottom side corrosion). a. b. c. d.
.250 .070 .002 .080
27. Using data from above, calculate MRT. (metal loss from internal corrosion). a. b. c. d.
.250 .070 .002 .080
28. The weld ripples of reinforcement of butt-welded joints shall be before _________ radiography. a. b. c. d.
removed ground flush, with grinding direction parallel to the weld ground flush, with grinding direction perpendicular to the weld removed if irregularities mask discontinuities
29. What is the hydrostatic test height of an in-service welded AST built to API 650, 8th Edition, 82’ diameter, 40’ tall with a minimum first course thickness of 0.197”. The material of construction is A-516, Grade 70 (A 516M Grade 485). a. b. c. d.
40’ 36’-2” 32’-8” 31’-6”
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30. For a single-wall material thickness, over 0.375” through 0.50”, what is the hole-type designation for a source side penetrameter? a. b. c. d.
15 17 20 25
31. The temperature range to conduct a standard technique liquid penetrant examination is ______. a. b. c. d.
500F 500F 700F 500F
to to to to
1350F 1250F 1150F 800F
32. During an MT examination, __________ shall be performed on each area. a. b. c. d.
100% coverage at the required sensitivity a calibration of each piece of magnetizing equipment at least three separate examinations prod spacing of at least 10”
33. An AC yoke shall have a lifting power of at least ____________. a. b. c. d.
5lbs. 8 lbs. 10 lbs. 40 lbs.
34. A DC yoke shall have a lifting power of at least _________. a. b. c. d.
5lbs. 8 lbs. 10 lbs. 40 lbs.
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35. A new tank will hold a product with the specific gravity of 1.05; The corrosion allowance is .10; The thickness of the first course is 1 .25 inches; Hydrostatic test stress 25,000 PSI. What is the thickness required for the annular plate? (Note: Include corrosion allowance). a. b. c. d.
5/16” 11/16” 3/8” 7/16”
36. A leak is noted 1 1/2” away from the shell-to-bottom weld in the floor of an existing welded tank. The hole in the floor is 4” in diameter. What type of repair, in compliance with API 653, 3rd Edition, should be made? a. Use RBI. Because the product might not contaminate the soil or waterways, no repair is required. b. Weld build-up the area. c. Install a ‘tombstone’ shaped, welded-on patch plate, intersecting the shell-tobottom joint at approximately 90°. d. Install a non-welded patch plate and fiberglass/epoxy to coat the area. 37. When using the SMAW process, a welder has changed from an F number 4 electrode to an F number 3 electrode. Does the procedure need to be requalified? a. b. c. d.
Yes No Only if low hydrogen electrodes are used API 650 allows this change
38. During a welder qualification test, for plate coupons, all surfaces (except areas designated “discard”) shall _______. a. show complete joint penetration with complete fusion of weld metal and base metal b. show no more than 1/3t inadequate penetration c. show no more than 1/3t nonfusion d. be allowed one 5/32” crater crack 39. What is the hydrostatic test thickness for a new tank whose diameter is 150’, and has a fill height of 40’? The shell material is A 36M. a. b. c. d.
0.655 0.611 0.563 0.500
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40. In order to comply with API 650, the finished surface of a weld reinforcement on plate 1/2” thick, horizontal butt joints, may have a reasonably uniform crown not to exceed ____________ for radiographic examination. a. b. c. d.
1/4” 3/16” 1/8” 1/16”
41. If piping near the tank enters the ground, the soil should be excavated ______ inches for inspection. a. b. c. d.
1—3 3—6 6—12 Piping is not addressed by any of the documents listed in the API 653 Body of Knowledge.
42. Floating roofs on new tanks shall be sufficiently buoyant to remain floating after ______. a. b. c. d.
Fifteen inches of rainfall in a 24-hour period Ten inches of rainfall in a 24-hour period Thirty inches of snow in a 24-hour period Thirty inches of sand in a 24-hour period
43. A sudden rapid fracture under stress, where the material exhibits little or no evidence of ductility or plastic deformation, is called _________? a. b. c. d.
brittle fracture cavitation atmospheric corrosion caustic corrosion
44. Each floor scanning operator, who only use the bottom scanning equipment, shall receive a minimum of ________ hours of training. a. b. c. d.
8 12 20 40
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45. Variables in the procedure that can be changed without having to re-qualify the procedure and/or the scanning operators are ________. a. b. c. d.
essential variables non-essential variables qualification tests TBEQ
Questions 46 through 50 apply to the WPS)PQR Procedure which begins on page 12. 46. What is the root face limitation as listed on the attached WPS and PQR? a. b. c. d.
3/32” 1/8” No limit Not designated
47. If the supporting PQR is used, are the P-no’s correct on the attached WPS? a. b. c. d.
Yes No Could be if properly preheated Not enough information
48. Is the thickness range on the WPS supported by the PQR? a. b. c. d.
Yes No Requalification is required by API 570 Requalification is required by ASME V
49. Is the attached PQR properly qualified? a. b. c. d.
No, because RT is not allowed during PQR qualification No, because there are not enough tensile tests No, because peening is allowed by B31.3 Yes
50. What should have been the correct number and type of guided bends on the PQR? a. b. c. d.
6 2 1 2
side bends face and 2 root bends side, 1 face and 1 root bend face, 2 root and 4 side bends
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Please close all materials. The remainder of the exam is “Closed Book.”
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The second part of the exam is “Closed Book,” 51. Who has the ultimate responsibility for complying with the provisions of API Standard 653? a. b. c. d.
API Owner/operator Inspector Contractor/builder
52. If cracks are suspected in nozzles or nozzle welds they should be checked by ______. a. b. c. d.
ultrasonic digital thickness gauge MT or PT examination eddy current testing infra-red thermography
53. Localized corrosion due to the concentration of caustic or alkaline salts is ______? a. b. c. d.
erosion brittle fracture caustic corrosion phase failure
54. Per API 653, tanks shall have a formal visual inspection once every _____ years or RCA/4N years, whichever is less. a. b. c. d.
three four five seven
55. Monthly visual inspections of the external condition of in-service tanks may be performed by ___________. a. b. c. d.
API 653 inspectors owner/operator personnel NDE technicians plant managers
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56. The critical zone for repairs to tank bottoms is that portion of the bottom or annular plate within _______ inches of the inside edge of the shell. a. b. c. d.
3 6 12 24
57. On a fixed-type roof, planks long enough to span at least _____ roof rafters should be laid and used as walkways. a. b. c. d.
none allowed 1 2 3
58. Cathodic protection surveys are recommended to ensure the effectiveness of cathodic protection. How often should this survey be done? a. b. c. d.
Every 10 years Every time the tank is empty Annually Semi-annually
59. The deflection of an arc from its normal path because of magnetic forces is _____. a. b. c. d.
arc arc arc arc
blow length strike angle
60. During the reconstruction of a tank shell, welding operators, welders and welding procedures must be qualified in accordance with _______. a. b. c. d.
API 650 ASME Section V ASME Section IX API 11O4
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61. Upon completion, the roof of a tank designed to be gas tight shall be tested by which one of the following methods? a. Magnetic particle testing of all welds b. Application of internal air pressure not exceeding the weight of the roof plates and applying a solution suitable for the detection of leaks c. Penetrant testing the weld joints d. Visual inspection of the weld joints 62. In regard to API 653, roof plates corroded to an average thickness of _______ inch in any 100 square inch area shall be repaired or replaced. a. b. c. d.
less than 0.09 0.09 greater than 0.09 no API 653 requirement, owner’s requirement
63. A fusion weld made without filler metal is _______. a. b. c. d.
brazing SMAW weld autogenous weld SAW weld
64. Each welder making welds on a tank shall be certified by _________. a. b. c. d.
erection/fabrication manufacturer purchaser Nuclear Regulatory Commission certified inspector
65. A discontinuity with a length that is substantially greater than its width is called a ______. a. b. c. d.
round discontinuity linear discontinuity non-linear discontinuity rejectable defect
66. A form of corrosion that occurs from moisture associated with atmospheric conditions is called ______ a. b. c. d.
brittle fracture caustic corrosion stress cracking atmospheric corrosion
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67. Which of the following tanks are used to reduce filling and breathing loss by eliminating vapor space? a. b. c. d.
Cone roof tank Umbrella-roof tank Vapor-dome roof tank Floating roof tank
68. Per API 650, external floating roof deck plates having support leg or other rigid penetrations closer than inches to lap weld seams must be full fillet welded not less than 2 inches on 10 inch centers. a. b. c. d.
6 12 14 18
69. Foundation pads that have washed out or settled under the bottoms of atmospheric storage tanks can be repaired by _________. a. b. c. d.
pumping in water pumping in argon pumping in sand, dirt or thin concrete pumping in gas
70. When corrosion rates are not known and similar service experience is not available, the actual bottom thickness shall be determined by inspections within the next _____ year(s) of tank operation to establish corrosion rates. a. b. c. d.
five ten three one
71. The mechanical working of metals using impact blows is referred to as ______. a. b. c. d.
inclusion corrosion fatigue peening
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72. Calcining can occur when concrete has been exposed to ______. a. b. c. d.
chemical attack sulfate - type alkalis chlorides high temperature
73. A contributing factor for determining internal inspection intervals shall be time, not to exceed _____ years for any reason, if an RBI program is not in place. a. b. c. d.
10 5 20 15
74. Upon completion of welding of the new tank bottom, the welds shall be inspected by which one of the following methods? a. b. c. d.
Radiographs Vacuum Penetrant testing Hammer testing
75. The junction of the weld face and the base metal is the __________. a. b. c. d.
heat affect zone weld toe stress riser dilution zone
76. Tank plates being welded which do not have proper identification shall be subjected to _______. a. b. c. d.
chemical analysis UT thickness measurements PT testing RTtesting
77. An assembly whose component parts are joined by welding is a _________. a. b. c. d.
spool piece weldment fillet weld groove weld
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78. ______ identifies a procedure for installing a nozzle in the shell of a tank that is in service. a. b. c. d.
Repair Alteration Hot tap Reconstruction
79. Annular bottom plates shall have a radial width that provides at least ________ inches between the inside of the shell and any lap-welded joint in the remainder of the bottom. a. b. c. d.
10 30 24 18
80. For known materials, all shell plates and bottom plates welded to the shell shall meet, as a minimum, the chemistry and mechanical properties of material specified for the application with regard to thickness and design metal temperature, per ________. a. b. c. d.
ASM Requirements ASME Requirements API 650 Requirements ASTMA 7 Requirements
81. What action should be taken after a flat spot is discovered in the second ring of a 200’ diameter AST? a. b. c. d.
The shell distortion shall be evaluated The area shall be cut out and replaced Since no product is leaking out of the area, it may be ignored The inspector has the option to repair or ignore
82. Routine in-service visual inspections of the external condition of the tank shall not exceed _______. a. b. c. d.
one month six months one year five years
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83. A separation at the joint root between the work pieces is referred to as a ________. a. b. c. d.
gap root face root edge root opening
84. Minimum thickness for tank bottom plate, when there is no means of leak detection and containment, is ________ inch. a. b. c. d.
.10 .075 .15 .05
85. When used, the ultrasonic thickness measurements shall be made at intervals not to exceed ________. a. b. c. d.
one month one year five years, (unknown corrosion rate) ten years, (unknown corrosion rate)
86. Cavity-type discontinuities formed by gas entrapment during solidification of the weld are ________. a. b. c. d.
cracks tungsten inclusion slag porosity
87. The most likely point of occurrence of cracks in riveted tanks is around _________. a. b. c. d.
internal piping flanged connections roof seals rivet holes
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88. Qualified inspectors shall have education and experience equal to at least one of the following: a. a degree in engineering plus 1 year of experience in inspection of tanks, pressure vessels or piping b. two years of experience in work related field c. two year certificate in technology from technical college d. high school education 89. The maximum acceptable undercutting of the base metal for vertical butt joints is _______ inch. a. b. c. d.
3/32 1/8 1/64 3/64
90. When used, ultrasonic thickness measurements shall be made at ____ year intervals after commissioning new tanks. a. b. c. d.
5 7 10 15
91. On a reconstructed tank, all new shell joints shall be __________. a. b. c. d.
full fillet welded with complete fusion butt-welded with complete penetration and complete fusion lap-welded with complete penetration and complete fusion single grove with backing strip
92. A non-metallic product resulting from the mutual dissolution of flux and non-metallic impurities in some welding processes is __________. a. b. c. d.
porosity tungsten inclusion slag cracking
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93. A double-welded butt weld is ___________. a. a joint between two abutting parts lying in approximately the same plane b. a joint between two abutting parts lying in approximately the same plane that is welded from both sides c. a joint between two overlapping members in which the overlapping edges of both members are welded with fillet welds d. a fillet weld whose size is equal to the thickness of the thinner joined member 94. All requirements of API 650, _____ shall be considered before changing the service of a tank to operation at temperatures above 200°F. a. b. c. d.
Appendix Appendix Appendix Appendix
M J C K
95. Openings in tank shells larger than required to accommodate a _______ inch flanged or threaded nozzle shall be reinforced. a. b. c. d.
one two three four
96. The API 653 standard employs the principles of _________. a. b. c. d.
API 650 ASME Article 4 AWS D1.1 API 11O4
97. Qualification test plates for floor scan, with flaws, should be a minimum of ___________ sq. ft. a. b. c. d.
20 70 90 150
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98. A fracture-type discontinuity characterized by a sharp tip and high ratio of length to width to opening displacement is referred to as _______. a. b. c. d.
crack slag porosity spatter
99. The acceptability of welds examined by radiography shall be judged by the standards in ______. a. b. c. d.
ASME Section V, Division 7 ASME Section IX, Paragraph QW191 ASME Section VIII, Division 1, Paragraph UW-51 (b) API11O4
100. Per API 653, what is the maximum allowable banding, using a vertical 36” sweep board? a. b. c. d.
1 1” 2 1/2” 3 3/8” 3/32”
101. The arrangement of direct current arc welding leads in which the electrode is the negative pole and the work piece is the positive pole of the welding arc is _____? a. b. c. d.
DCEN DCEP AC AC/DC
102. Any work on a tank that changes its physical dimensions or configuration is considered a/an ____________. a. b. c. d.
reconstruction rebuilding reworking alteration
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103. When bottom annular plates are required by paragraph 3.5.1 of API 650, the radial joints shall be radiographed. For single welded joints using a backup bar, one spot radiograph shall be taken on _____ percent of the radial joints. a. b. c. d.
10 30 50 100
104. What is the maximum allowable misalignment on a 3/4” vertical butt joint? a. b. c. d.
10% 1/16” 10% or maximum of 1/8” 12% or maximum of 3/32”
105. Atmospheric storage tanks are those tanks that have been designed to operate in their gas and vapor spaces at internal pressures which approximate pressure. a. b. c. d.
16 lbs. to 25 lbs. 12 lbs. to 15lbs. more than 25 lbs. atmospheric
106. The arrangement of direct current welding leads in which the electrode is the positive pole and the work piece is the negative pole of the welding arc is _________? a. b. c. d.
DCEN DCEP AC AC/DC
107. The portion of the groove face within the joint root is called __________. a. b. c. d.
land root face stringer bead root pass
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108. Welder identification on roof welds and flange-to-nozzle neck welds shall ________. a. b. c. d.
be hand or machine stamped be stamped every 3 feet be stamped on the top side of each nozzle an in every 3 feet of roof weld not require identification
109. Annular bottom plates must extend a minimum of _______ inches outside the tank shell. a. b. c. d.
1 1/2 2 3 4
110. For penetrations using insert plates, how shall the completed butt welds between the insert plate and shell plate be inspected? a. b. c. d.
100% RT Spot RT MT Visual
111. NDE examiners that meet the requirements of ASME Section V, Article 1, are qualified with ASNI/ASNT CP-189 or _________. a. b. c. d.
AWS QC-1 API ASNT SNT-TC1A ABS
112. The maximum operating temperature for tanks constructed to API 650 (not including appendices) is ______. a. b. c. d.
500°F 500°C 200°F 200°C
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113. New _______ for floating roof support legs and for fixed roof support columns shall be installed when replacing a tank floor. a. b. c. d.
mud rings leg guides bearing plates support leg pins
114. Where does the new nameplate need to be attached to a reconstructed tank? a. b. c. d.
Adjacent to the existing nameplate Does not need one On the roof Over the suction piping
115. The corrosion rate for an AST is 5 mils per year. Based on API 653 requirements when should the next external UT inspection be scheduled? Note: Remaining Corrosion Allowance is .17 inches. a. b. c. d.
17years 15 years 20 years 10 years
116. The design thickness of a reconstructed tank is based on _________. a. b. c. d.
original shell thickness measurements taken within 180 days prior to relocation measurements taken when the tank was removed from service new product loads
117. The maximum design liquid level for product shall be determined by calculating the maximum design liquid level for each shell course based on _________. a. b. c. d.
amount of product needed the specific gravity of the product material coating number of penetrations in the first shell course
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118. SW is the acronym for what type of welding? a. b. c. d.
Submerged Welding Shielded Metal Arc Welding Slick Welding Stud Welding
119. You are adding a 6 inch blending nozzle to the bottom course, the shell is 5/8” thick. What size insert plate is required when used with a reinforcement plate? a. b. c. d.
12” diameter 18” diameter Three times the diameter of the penetration The diameter of the reinforcement plate, plus 12”
120. Who is responsible for compliance with the API 650 standards? a. b. c. d.
Manufacturer Purchaser State Inspector API 653 Inspector
121. ____________ settlement occurs when the tank shell settles sharply around the periphery, resulting in deformation of the bottom plate. a. b. c. d.
Uniform Edge Out-of-Plane Rigid Body Tilting
122. A full hydrostatic test can be waived on a tank _________. a. b. c. d.
after replacement of door sheet that intersects the shell-to-bottom weld when a 36-inch nozzle has been installed after partial or complete jacking of a tank shell if the owner or operator has authorized the exemption in writing
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123. Which type of tank settlement will rotate the tank in a tilted plane? a. b. c. d.
Uniform settlement Rigid body Out-of-Plane settlement Differential settlement
124. Due to the fast-freezing nature of this process, there is potential for lack of sidewall fusion when welding thick-wall equipment or a nozzle attachment. a. b. c. d.
GMAW GMAW GMAW GMAW
-
Pulsed Spray G S
125. The minimum thickness of new roof plates shall be _____ inch, plus any corrosion allowances, as specified in the repair specifications. a. b. c. d.
1/2 7/8 3/16 3/8
126. Express 50 mils as ______ inch(es). a. b. c. d.
.500 .050 .005 .0005
127. For replacement of tank bottom floor, what is a suitable non-corrosive material for use between the old and new floor? a. b. c. d.
Dirt Sand or concrete Fiberglass insulation Air
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128. According to API 653, the basis for repairs and alterations shall be an ________. a. b. c. d.
API Standard 650 equivalence API Standard 2207 equivalence ASME Section V equivalence AWS D 1 .1 equivalence
129. All new shell joints shall be _______ joints, with complete penetration. a. b. c. d.
butt welded lap welded riveted chemically bonded
130. During the repair of an AST, one new vertical shell weld was installed. How many radiographs are required on the vert? (The shell is 1 .25” thick). a. b. c. d.
One radiograph shall be taken in every vertical joint 100% of the vertical joint Two radiographs shall be taken in the vertical joint No radiographs required
131. Settlement can result from _______. a. b. c. d.
frequent freezing and thawing of the ground nearby equipment operating with extreme vibration too much product being stored in the tank high wind
132. Storage tanks shall be ____ and gas-freed prior to commencement of dismantling. a. b. c. d.
filled drained cleaned vented
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133. All bottom plates shall have a minimum nominal thickness of _________ inch, exclusive of any corrosion allowance specified by the purchaser for the bottom plates. a. b. c. d.
3/8 .250 .516 .325
134. ____________ means the work necessary to reassemble a tank that has been dismantled and relocated to a new site. a. b. c. d.
Reconstruction Rebuilding Reworking Alteration
135. Repairs shall not be attempted on a tank that is filled with _____ or on a tank that has contained until the tank has been emptied, cleaned and gas freed in a safe manner. a. b. c. d.
nitrogen oil water grain
136. According to API 653, a full hydrostatic test, held for 24 hours, shall be performed on: a. b. c. d.
a new tank an in-service tank a reconstructed tank an out-of-service tank
137. Misalignment in completed vertical joints over 5/8” shall not exceed what percentage of the plate thickness? a. b. c. d.
25% with a maximum of 1/16” 2% with a maximum of 3/64” 5% with a maximum of 3/8” 10% with a maximum of 1/8”
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138. New or altered reinforcing plates of shell penetrations shall be given a(n) __________ test, in accordance with API Standard 650. a. b. c. d.
diesel air stress gas
139. Ultrasonic acceptance standards, in accordance with API 653, shall be __________. a. b. c. d.
ASME Section VIII ASME Section V ASME Section Xl Agreed upon by the purchaser and the manufacturer
140. Column-based clip-guides shall be welded to the tank bottom to prevent ________. a. b. c. d.
internal erosion structural uplifting lateral movement of column bases lateral expansion and contraction
141. Any specific design considerations, other than normal product loading, shall be specified by _______. a. b. c. d.
owner/operator contractor engineer welding foreman
142. A(n) ________ is an electrode of an electrochemical cell at which oxidation (corrosion) occurs. a. b. c. d.
bathode anode cathode electrolyte
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143. A(n) ________ is an electrode of an electrochemical cell at which a reduction reaction occurs. a. b. c. d.
bathode anode cathode electrolyte
144. A __________ is a discontinuity in a coating film that exposes the metal surface to the environment. a. b. c. d.
vacation surface interruption stress riser holiday
145. ____________ occurs when two metals with different compositions (thus different electrolytic potentials) are connected in an electrolyte (usually soil). a. b. c. d.
Scattered metal growth Scattered metal blistering Galvanic corrosion Erosion
146. A Galvanic system is a _________. a. b. c. d.
system that uses a system that uses a system that uses a system that uses a
metal less active than the structure to stop corrosion metal more active than the structure to stop corrosion chemical to stop corrosion coating to stop corrosion
147. All tanks shall be given a formal visual external inspection by an inspector qualified in accordance with API 653, Paragraph 4.10 at least every _____ years. a. b. c. d.
10 7 6 5
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148. Welding consumables shall conform to the classification that is applicable to the intended use. a. b. c. d.
ASNT AWS ASME API
149. The rules given in API 653 are _________ for tank inspection, repairs, alterations and reconstruction. a. b. c. d.
minimum requirements maximum requirements guideline requirements suggested requirements
150. ____________ means any work on a tank involving cutting, burning, welding or heating operations that changes the physical dimensions and/or configuration of a tank. a. b. c. d.
Repair Reconstruction Reworking Alteration
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