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API-653 Exam (March 2016)

1. A party other than the owner/operator is assigned certain tasks, such as relocating and reconstructing a

tank, the limits of responsibility for each party shall be defined by the owner/operator prior to

commencing work.

2.

The owner/operator as Authorized inspection agency, inspection program shall provide the controlsnecessary for use by authorized inspectors contracted to inspect aboveground storage tanks.

3. Which of the following is considered to be an alterationinstallation of shell penetration of NPS 14 in

4. Jacking a tank shell is considered to be major repair

5. When a frangible roof-to-shell joint is required, evaluate for items impacting compliance with

requirements under API 650 includes tank bottom-to-shell joint corrosion

6. Areas in the roof that are pitted shall be evaluated to determine the likelihood of through-pitting

occurring prior to the next scheduled internal inspection

7.

When service of a tank is changed from heavy stored naphta to diesel service Vents shall be inspected

for proper operation

8. L is the maximum length, in inches, over which hoop stresses are assumed to average out around local

discontinuities, this length shall bechosen to be in a vertical plan

9. L shall not exceed 40''

10.

Widely scattered pits may be ignored provided that: no pit depth results in the remaining shell thicknessbeing less than one-half the minimum acceptable tank shell thickness exclusive of the corrosion

allowance

11.Problem for the previous criteria

12.Problem for determine H for local thin area

13.Problem for T min. For the entire shell course

14.Problem for determine Stfor A51670

15.Closed Problem for determine E for a Tank built for API-12C 14thEdition. 0.85

16.Which of the following not considered Distortion of the tank shell ?tank shell out of plan tilt

17.Which of the following change in service conditions will tend to reduce the capacity of the tank?

a) Change the operating temp from 200 F to 300 F (to reduce the vapor volume of the tank resulted

from the partial pressure)

b) Change the product from G=0.9 to a lighter one with G=0.8

c) Reduce of the design metal temp.

18.

Min. bottom plate thickness for Tank bottom/foundation design with no means for detection and

containment of a bottom leak is 0.1''

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19.For given D, t , H what is minimum thickness of the annular plate

20.

During external visual inspection, Concrete pads cracks showing evidence of spalling, but the re-bar is

not exposed your action is foundationshall be repaired. (i.e. without entire removal of the foundation

and make a new one)

21.Which of the following has the leasteffect on the probability of storage tank brittle fracture corrosion

rate of the shell

22.When change concerning the external pressure, the roof-to-shell junction shall be evaluated for the

effects of a design partial vacuum according to The criteria outlined in API 650

23.For brittle fracture assessment, which of the following shall consider the demonstration of hydrostatic

test?

24.Which of the following inspections can be performed with unauthorized inspector? routine inspection

25.Routine inspection interval shall not exceed one month

26.U.T measurement interval of unknown corrosion rate 5 years

27. RCA definition

28. Corrosion rate problem

29. RCA problem

30. Ground connection can be checked during the required external visual inspectionAPI-653 6.3.2.3 (not

operation inspection)

31. A tank was built and enters the service in Jan. 2005; initial internal inspection shall be made before date

Jan.2015

32. The external visual inspection shall be every five years, when this inspection can be made before this

period, if theinterval is calculated to be less than the one- fourth corrosion rate life.

33. Personnel performing C.P surveys shall be in according to theAPI-651

34. The best method in determining the bottom thicknessDigital UT measurements.

35. UT measurements can be performed from external inspection and during internal inspection

36. Prior to conducting internal or external inspection, the inspector should thoroughly review any available

inspection recordsto become familiar with previous problems and recommendations noted.

37. Reports shall include recommendations for repairs and the reasons for the repairs

38. All new materials used for repair, alterations, or reconstruction shall conform to the current applicable

standard

39. The maximum liquid level for hydrostatic test shall be determined by calculate the allowable stress valueas the lesser of 3/4 yield strength or 3/7 tensile strength shall be used

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40. If a corrosion allowance is required for the reconstructed tank, the required corrosion allowance shall be

deducted from the actual thickness before calculating the maximum liquid level

41. The thickness of the replacement shell plate shall not be less than the greatest nominal thickness of any

plate in the same course adjoining the replacement plate except where the adjoining plate is a thickened

insertplate

42. The repair plate may cross any butt-welded vertical or horizontal shell seams that have been ground

flush, but must overlap a minimum of 6 in. beyond the shell seam

43. Determine A in Fig 9.7 t=5/16A=3/8

44. A new bottom may be installed through an existing tombstone reinforcing plate by remove only that

portion of the existing reinforcing plate necessary to weld and test the new bottom-to-shell weld.

44. During in service inspection the measured thickness for the shell observed to be less than 50% of min.

required thickness, in your opinion, for continued operation what is the action to be taken?Reduce the liquid

height.

45. Welded-on patch plates are not permitted in the critical zone for a carbon steel tank bottom with an

operating temperature exceeding 200 0F

46. Arc strikes discovered in or adjacent to welded joints shall be repaired by grinding and/or welding.

47. The use of welded-on patch plates that do not meet the requirements is permitted if the repair method has

been reviewed and approved by an engineer experienced in storage tank design in accordance with API 650

48. All arc-gouged areas of the tank shell-to-bottom weldshall be magnetic particle examined, and defective

areas repaired and re-examined.

49. Hot taps are not permitted on the roof of a tank or within the gas/vapor space of the tank.

50. Completed welds of stress-relieved assemblies shall be examined by the magnetic particle or liquid

penetrant methods after stress relief, but before hydrostatic testing

51. New welding on the shell-to-bottom joint shall be examined for its entire length by using a right-angle

vacuum box and a solution film, or by applying light diesel oil

52. The minimum diagnostic length of each radiographshall be 6 in.

53. Radiographs and radiograph records of all repaired welds shall be marked with the letter R.

54. Personnel performing PT, MT, and RT shall be qualified as well aspersonnel performing VB.

55.

Hydrostatic Testing Exemptions if the tankowner/operator has authorized the exemption in writing.

56. Calculate the min thickness of the shell plate used for hot tapping a NPS 18'' nozzle.

57. FFS shall be performed by an engineer experienced in storage tank design and the evaluation

methodologies used.

58. For Tank Diameter 65 feet, min. number of the settlement pointsis8

59. If maximum height of bulge or depth of local depression exceeds the limits shown per API 653, Repairs

or a rigorous assessment should be conducted

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60.During internal inspection two flat spots have been observed with 2 in depth and 5 ft height, these spots

does not contain any weld seam, what is the action is to be taken no required repair as these spots are in the

limits

61. Settlement measured is done by an engineer experienced in settlement measurement

62.

In riveted Shell Inspection, what is the best method to locate leaks?By sketch or photo

63. NDE performers should be qualified and certified according toASNT-SNT-TC-1A

64.

MFL operators shall receive training of 40 hours.

65. The sample tank bottom should be a minimum of70 ft2

66. When qualifying either a procedure or a scanning operator, for remaining bottom thickness less than .05

the operator must be able to detect the following Flaws 90% to 100 %

67. For similar service assessment, Heavy sticky oil is as classH.

68. If the criteria for the control tank and candidate tank do not match, the difference in corrosion allowance

should be accounted for in the remaining life and inspection interval calculations to consider both tanks in

similar service.

69. Unsupervised RT examiner shall qualified toASNT-SNT-TC-1A level 1

70. At each roof column, a wear plate with a nominal thickness of not less than 6 mm (1/4 in.) shall be

welded to the tank Bottom with a 6 mm (1/4 in.) minimum fillet weld.

80. If a drip ring is specified by the tank owner, it shall have an extension beyond bottom plate by min. 3''

81. Hardness test is important after PWHT for weld and heat affected zone to obtain acceptable softening of

the welds

82."B" back scatter letter image is rejected when it is white

83. What is the designation IQI hole type if (t=0.5" and IQI will be @ source side)?

84. Densitometers shall be calibrated bystep wedge calibration film.

85. Concerning MT by using prod Tech., during calibration the unit meter, the readings shall not deviate bymore than 10% of full scale

86. How many RT films shall be taken for completed joints of a replaced rectangular portion of the tank

shell?6 films

87. During performing vacuum box test according to API-650, Partial vacuum pressure to be registered shall

have a minimum pressure of 3 PSI.

88. When it is impractical to stress relieve at a minimum temperature of 600 C (1100 F), it is permissible

to carry out the stress-relieving operation at 1000 F for 4 hours table 5.7.4.5

89. During internal inspection which of the following methods are not reliable to obtain the bottom plate

thickness?Taking sample coupon

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90. For frangible roof, fillet weld size of the top angle shall not exceed 3/16"

91. Min. Soil-to-structure potential reference to Cu / CuSo4electrode - 850 m .v.

92. Each individual plate for which adequate identification does not exist shall be subjected to, chemical

analysis and mechanical tests including Charpy V-notch.

93. During tension test the failure of the specimen occurred away from the weld in the base metal this is an

accepted test provided that UTS not more than 5% less than UTS

94. Inorganic zinc (zinc silicates) is often applied to internal tank surfaces however it is not considered a thin

film coating according to API-653

95. High voltage detector is used for thick film holiday test

96. For reconstruction of tanks, if plate thickness is 0.5" and the climate temperature is 32 F, what is the

action is to be taken to prepare these plates for weldingpreheating to 140 F (warm to hand)

97. If welder is qualified for welding of plate groove it also qualified for most fillet weld

98. Low voltage detector for thin film holiday test(67.5 v)

99. Prior to energizing a new cathodic protection system, measurements of the structure-to-soil potential

should be taken.

100. The best way to determine that RT has been performed to the right procedure and applicable standard is

to demonstrateproper film density and IQI designation.

101. Hummer test is has not a beneficial method in determination of lining adhesion

102. Riveted bottom tanks can be inspected for tightness by running a thin-bladed scraper or knife along the

riveted seam

103. The best way to determine the extent of lining before repair is by visual inspection

104. The condition of anchor bolts can usually be determined by visual inspection and hummer test

105. During visual inspection the tank ground connection is observed to has electrical damage so your action

is, its resistance can be checked

106. During the external visual inspection of an insulated tank which of the following locations mustreceive

a more care and special attentionInsulation support clips, angles, and bands.

107. The best method to measure the depth of isolated pitted areapit gauging.

108. When a floating roof is tested by volatile material inside the tank at the time of inspection, the floating

roof should be as high as possible

109. Connected Pipe outside tank and go underneath ground, the soil around pipe shall be removed and the

pipe inspected visually

110. Carbon steel and 300 Series SS have serious corrosion problems in high strength caustic solutions

above about 150F

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.

111. Concerning Cl- SCC, cracking usually occurs at metal temperatures above about140 oF.

112. Brittle fracture is usually occurring at which temperature?below the ductile to brittle transition temp.

113. Brittle fracture factorsstress + susceptible material + flaws

114. An interruption of the typical structure of a material, such as a lack of homogeneity in its mechanical,metallurgical, or physical characteristics isDiscontinuity (API-577- 3.1.22)

115. Bonding (grounding) shunts shall be provided on the external floating roof and shall be located above

the uppermost seal (API-650 Annex C)

116. The permeability of the leak detection barrier shall not exceed 107cm (4 105mils) per sec. (API-

650 Annex I.2)

117-118-119 WPSPQRproblems

120. The flow area of the flame arrestor can be restricted bysolidification of vapors from the stored product.

121. During internal inspection accumulation of self ignition sources can be found on the tank bottom and

top of rafters

122. If tank original material of construction is A-285 and the repair organization proposed a patch plate

material of A-36 what is your opinion to complete this repair ? This repair should be approved by tank Eng.

123. A-516-70 Sd=?

124. Corrosion rate problem

125. During UT survey, the annular plate thickness was 0.2 however it was previously has an original

thickness of 0 .3'', so your assessment is? Accept the results and continue to use in service as the min.

thickness required is 0 .1 as per API-653

126. Which of the following materials are supposed to lesser the bottom under side corrosion?

127. Microbial corrosion can be found in anaerobic water spots

128.During CP survey it was observed that the soiltostructure potential readings are no longer adequate,

as authorized inspector what is the action to be taken ? Faults to be found repaired and re-adjusted

129. During Hydro test for a tank shell 0.5'' thick what is the water filling rate for the lower bottom course?

(API-650 Sec.7)

130. Reports of repair include the reason of repair and

131. Usually, close visual inspection is sufficient when checking for crack -like flaws but for increased

sensitivity,liquid penetrant or magnetic particle examination should be used

132. Anchored piping inspection is important because of which of the following? It can make serious

problems during any settlement or ground movement

133.A welder is qualifying in SMAW and SAW, he weld with SMAW only, so his qualification for the

other method is valid for6 months

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134.Settlement survey shall be conducted for all existing tanks that undergo a hydrostatic test except for

tanks that have a documented service history of acceptable settlement values and

no settlement is anticipated

to occur during the hydro test

135. For the purpose of surface preparation prior to lining application, the preparation procedure is as

followingremove all hydrocarbon residues such as oil by Solvent cleaning and high or ultra-high pressure

water or steam cleaning, fresh water rinse then sandblasting

136.Internal corrosion of carbon steel tanks in the vapor space can be caused by hydrogen sulfide vapor,

water vapor, oxygen

137. The standard method of determining the effectiveness of cathodic protection on a tank bottom is the

tank-to soil potential measurement

For any inq uir ies,

Mohamed Fathy

Email:Mohamedmf@gupc o.net

Mob ile 01224483913

mailto:Mohamedmf@gupco.netmailto:Mohamedmf@gupco.net