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API 653 > Closed book 1 > Flashcards

Closed book 1 Flashcards

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1
Q

Lapped patch shell repairs shall not be used on any shell course thickness(original construction) that

a) is less than 1/2 in.

b) is more than 1/2 in.

c) is equal to or more than 1/2 in.

d) is equal to or less than 1/2 in.

A

b) is more than 1/2 inch

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2
Q

The 1-foot method of thickness calculation is limited to tanks that are a maximum of

A

200 feet in diameter

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3
Q

The sudden rapid fracture under stress where the material exhibits little or no evidence of ductility or plastic deformation is

a) thermal fatigue

b) stress corrosion cracking

c) mechanical fatigue

d) brittle fracture

A

d) brittle fracture

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4
Q

API 653 cover existing tanks built to

a) API 650

b) API 650 and 12C

c) API 650, API 620, and API 12C

d) API 650, API 12C, and API 12E

A

b) API 650 and API 12C

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5
Q

How often shall the welder stamp the assigned symbol on completed welds

A

3 foot intervals

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6
Q

The open discontinuities that would be acceptable in the heat affected zone

A

everything up to and including 1/8 in. is acceptable

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7
Q

The open discontinuities that would NOT be acceptable in the heat affected zone

A

everything above and including 5/32 is NOT ACCEPTABLE

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8
Q

Select the responsibilities that belong to the owner/user. Choose all that apply

a) review inspection findings and inspection recommendations

b) establish a repair scope if needed

c) determine appropriate timing for repairs

d) determine appropriate timing for maintenance activities

A

a) review inspection findings and inspection recommendations

b) establish a repair scope if needed

c) determine appropriate timing for repairs

d) determine appropriate timing for maintenance activities

owner/ operator has overarching responsibilities for the tank

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9
Q

A tank has experienced uniform corrosion over 15 years of service. The original thickness of 0.625 in. and the current measured thickness is 0.541 in.
The required thickness is 0.452 in.
What is the remaining life for this tank?
Round down to the nearest year.

a) 5 years

b) 10 years

C) 15 years

d) 20 years

A

c) 15 years

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10
Q

When the direction of rolling is not known for material to be re-used in a reconstructed tank.

a) it shall be replaced

b) two charpy impact specimens shall be taken at right angles to each other

c) two tension tests shall be taken at right angles to each other

d) any of the above

A

c) two tension tests shall be taken at right angles to each other

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11
Q

To determine if backscatter radiation is exposing the film, a lead symbol “B” shall be attached to the back of the film holder.
The dimension of the lead symbol “B” shall be a minimum of

a) 1/2 in. thickness by 1/16 in. height

b) 1/16 in. thickness by 1/16 in. height

c) 1/16 in. thickness by 7/16 in. height

d) 1/16 in. thickness by 1/4 in. height

A

c) 1/16 in. thickness by 7/16 in. height

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12
Q

API 650 is intended as a purchase specification for oil tanks that do not exceed

a) 15 psi internal pressure

b) 12.5 psi internal pressure

c) 7 psi internal pressure

d) 2.5 psi internal pressure

A

d) 2.5 psi internal pressure

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13
Q

If a tank is to be deemed not at risk for brittle failure it (choose all that apply)

a) will have a metal temperature of 60 F or higher

b) will have a nominal thickness of 0.50 in. or more

c) will be constructed to API 650 7th edition or later

d) will have been switched to a service with a higher specific gravity

A

a) will have a metal temperature of 60 F or higher

c) will be constructed to API 650 7th edition or later

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14
Q

How many shell plate thickness measurements shall be taken along the circumference of the proposed hot tap location when performing preparatory work for hot tapping

a) 1

b) 2

c) 4

d) 8

A

c) 4

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15
Q

The maximum vertical and horizontal of repair plates shall be

a) 48 x 72

b) 36 x 48

c) 48 x 60

d) 72 x 72

A

a) 48 in. x 72 in.

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16
Q

When constructing a new tank to API 650, openings in the shell ____ shall be reinforced

a) >_ NPS 2

b) _< NPS 2

c) < NPS 2

d) > NPS 2

A

d) > NPS 2
larger than NPS 2

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17
Q

When considering the effects of CUI on externally insulated stainless steel pipe, where CISCC is the concern, refiners generally focus on the temperature range of

a) 10 F to 350 F

b) 140 F to 400 F

c) 10 F to 400 F

d) 140 F to 350 F

A

d) 140 F to 350 F

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18
Q

The area on a tank bottom where settlement begins is referred to as

a) the settlement point

b) the breaking point

c) the breakover point

d) the candidate point

A

c) the breakover point

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19
Q

A tool that has been developed to evaluate the weldability of carbon and alloy steel is the

a) carbon percentage equation

b) alloy equivalent equation

c) carbon equivalent equation

d) carbon balance equation

A

c) carbon equivalent equation

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20
Q

How far back shall the horizontal seams be cut from the vertical welds in a door sheet installation that crosses vertical lap welded seams?

a) 6 inches

b) 12 inches

c) 24 inches

d) door sheets are not allowed to cross vertical lap welded seams

A

d) door sheets are not allowed to cross vertical lap welded seams

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21
Q

Thickness to be used for each shell course when checking tank design prior to tank relocation shall be taken within _____ days of relocation.

a) 30

b) 60

c) 90

d) 180

A

d) 180

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22
Q

Which of the following is NOT a mechanical property?

a) coefficient of thermal expansion

b) tensile strength

c) hardness

d) toughness

A

a) coefficient of thermal expansion

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23
Q

Before entering or re-entering a tank an inspector should ensure (choose all that apply)

a) Removal of hazardous gases

b) Removal of pyrophoric material

c) Isolation of of any source of toxic gases

d) Assurance that the atmosphere contains enough oxygen

A

a) Removal of hazardous gases

b) Removal of pyrophoric material

c) Isolation of of any source of toxic gases

d) Assurance that the atmosphere contains enough oxygen

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24
Q

Inspection reports shall contain at a minimum (choose all that apply)

a) date of the inspection

b) corrosion rates of the bottom and the roof

c) description of the tank

d) inspection methods used and results of each inspection

A

a) Date of the inspection

c) Description of the tank

d) Inspection methods used and results of each inspection

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25
Q

All bottom plates shall have a corroded thickness of not less than

a) 0.1875 in.

b) 0.236 in.

c) 0.250 in.

d) 0.3125 in.

A

b) 0.236 in.

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26
Q

Widely scattered pits may be ignored provided that no pit depth results in the remaining shell thickness being less than one-half the minimum acceptable tank shell thickness exclusive of corrosion allowance and the sum of their dimensions does not exceed

a) 1 inch in any 8 inch length

b) 2 inch in any 8 inch length

c) 3 inch in any 8 inch length

d) 4 inch in any 8 inch length

A

b) 2 inch in any 8 inch length

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27
Q

A roof formed to approximately the surface of a right cone that is supported principally either by rafters on girders and columns is

a) a self-supporting umbrella roof

b) a self-supporting cone roof

c) a supported cone roof

d) a supported dome roof

A

c) a supported cone roof

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28
Q

The examiner is a person who assists the inspector by performing specific NDE on aboveground storage tanks and evaluates the applicable acceptance criteria, but does not interpret the results of those examinations in accordance with API 653 unless specifically trained and authorized to do so by the

a) engineer

b) examiner’s employer

c) owner/ operator

d) authorized inspector

A

c) owner/operator

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29
Q

Testing of drain lines and swing joints when the tank is out of service can be accomplished by

a) hydrotest

b) two stage hydro-pneumatic test

c) radiography followed by hydrotest

d) none of the above

A

b) two stage hydro-pneumatic test

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30
Q

After severe climatic events such as high winds, heavy rain or lightning, it may be desirable to check (choose all that apply)

a) the internal floating roof for excessive water loads

b) the foundation for deterioration

c) the internal floating roof deck and seals to see if they have been damaged

d) the roof for evidence of deformation due to excessive loading

A

b) the foundation for deterioration

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31
Q

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

a) the tank to soil potential measurement

b) the soil to anode potential measurement

c) the shell to bottom potential measurement

d) the shell to soil potential measurement

A

a) the tank to soil potential measurement

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32
Q

A welder experiences burn through in a NPS 10 carbon steel pipe weld . What would be a practical solution for this?

a) reduce travel speed

b) remove by grinding

c) proper heat input

d) proper cleaning

A

c) proper heat input

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33
Q

The area of the highest stress in a flat bottom tank is usually

a) at nozzle welds

b) at the roof to shell joint

c) at the shell to bottom weld

d) at the annular plate weld

A

c) at the shell to bottom weld

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34
Q

API 650 applies only to tanks whose bottom is uniformly supported and to tanks in non-refrigerated service that have a maximum design temperature of

a) 200 F

b) between 200 F and 300 F

c) between 200 F and 400 F

d) between 200 F and 500 F

A

a) 200 F

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35
Q

Radiographs shall be made using what type of radiographic film

a) commercial

b) industrial film

c) Kodak

d) retail

A

b) industrial film

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36
Q

Installing a new nozzle below the liquid level that is NPS 14 in size is

a) an alteration

b) a repair

c) a major alteration/ or major repair

d) a hot tap

A

c) a major alteration/ or major repair

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37
Q

Where is MIC most often found (Choose all that apply)

a) water cooled heat exchangers

b) bottom water layer of storage tanks

c) pressure vessels that have been hydrotested

d) piping with stagnant flow

e) piping in contact with some soils

A

a) water cooled heat exchangers

b) bottom water layer of storage tanks

c) pressure vessels that have been hydrotested

d) piping with stagnant flow

e) piping in contact with some soils

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38
Q

Roof plate thickness of a new tank shall not be less than a nominal thickness of

a) 3/16 in.

b) 9 gauge sheet

c) a or b

d) 0.17 in.

A

a) 3/16 in.

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39
Q

Choose all the allowable undercut dimensions for horizontal joint in a newly constructed API 650 tank

a) 1/64 in.

b) 1/32 in.

c) 1/16 in.

d) 1/8 in.

e) 5/32 in.

A

a) 1/64 in.

b) 1/32 in.

Up to and including 1/32 in.

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40
Q

Flame arrestors should be opened for inspection

a) at least once a month

b) at least once a year

c) at an appropriate interval

d) they should not be opened

A

c) at an appropriate interval

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41
Q

The maximum size of a frangible roof weld on the top angle is

a) 3/16 on top or bottom

b) 3/16 on the bottom only

c) 3/16 on the top only

d) 3/16 on the top and bottom

A

c) 3/16 on the top only

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42
Q

How many settlement points are required as a minimum for the hydrotest following a major repair?

a) 6

b) 8

c) 10

d) 12

A

b) 8

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43
Q

What type of settlement may impede the proper functioning of a floating roof?

a) planar settlement

b) uniform settlement

c) out -of-plane settlement

d) edge settlement

A

c) out-of-plane settlement

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44
Q

When evaluating a shell for suitability for service, the critical length L designated by API 653 shall not exceed

a) 80 in.

b) 60 in.

c) 40 in.

d) 20 in.

A

c) 40 in.

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45
Q

The degree and soundness of groove welded joints are determined by

a) tension testing

b) guided bend testing

c) fillet weld tests

d) notch toughness test

A

b) guided bend testing

46
Q

Cinder in the pad forming a tank foundation may contain

a) manganese compounds that become very corrosive in the presence of moisture

b) sulfur compounds that become very corrosive in the presence of moisture

c) silicon compounds that become very corrosive in the presence of moisture

d) carbon compounds that become very corrosive in the presence of moisture

A

b) sulfur compounds that become very corrosive in the presence of moisture

47
Q

Annular plates shall have a radial width that provides a minimum of

a) at least 12 inches between the inside of the shell and any lap welded joint in the bottom

b) at least 24 inches between the inside of the shell and any lap welded joint in the bottom

c) at least 36 inches between the inside of the shell and any lap welded joint in the bottom

d) at least 72 inches between the inside of the shell and any lap welded joint in the bottom

A

b) at least 24 inches between the inside of the shell and any lap welded joint in the bottom

48
Q

Banding on reconstructed tanks shall not exceed

a) 0.50 in.

b) 1.0 in.

c) 1.5 in.

d) 2.0 in.

A

b) 1 in.

49
Q

During the erection of a new tank, once the welding of the bottom is finished, it shall be

a) inspected visually

b) inspected visually, then with a vacuum box and tracer gas test

c) inspected visually, then with a vacuum box and pumping 6 inches of water under

d) inspected visually, then with a vacuum box, or tracer gas test or pumping 6 inches of water under

A

d) inspected visually, then with a vacuum box, or tracer gas test or pumping 6 inches of water under

50
Q

Densitometers shall be calibrated at least

a) once a year

b) every 6 months

c) every 90 days

d) every 7 days

A

every 90 days

51
Q

Which of the following would not be required on a nameplate for an API 650 tank?

a) the year the tank was designed

b) the nominal diameter and height

c) the design specific gravity of the liquid

d) the design metal temperature

A

a) the year the tank was designed

52
Q

A hot tap procedure for installing a nozzle in an inservice tank containing petroleum products shall be developed in accordance with

a) API 575

b) API 2016

c) API 2201

d) API 2203

A

c) API 2201

53
Q

Pipe with its axis horizontal and rolled during welding so that the weld metal is deposited from above is what position

a) 1G

b) 2G

c) 3G

d) 4G

A

a) 1G

54
Q

The minimum dimension for replacement shell plate is

a) 6 inches or 6 times the thickness of the replacement plate, whichever is greater

b) 8 inches or 8 times the thickness of the replacement plate, whichever is greater

c) 10 inches or 10 times the thickness of the replacement plate, whichever is greater

d) 12 inches or 12 times the thickness of the replacement plate, whichever is greater

A

d) 12 inches or 12 times the thickness of the replacement plate, whichever is greater

55
Q

A nameplate that is to be attached to a tank that has no design information available shall be marked

a) Replacement Nameplate

b) Construction Nameplate

c) Assessment Nameplate

d) Inspection Nameplate

A

c) Assessment Nameplate

56
Q

A Lehigh test is a type of

a) externally loaded test

b) underbead cracking test

c) lamellar tearing test

d) restraint test

A

d) restraint test

57
Q

Which of the following statements is true regarding galvanic corrosion?

a) current will flow from the cathode to the anode with accelerated attack at the anodic metal

b) current will flow from the anode to the cathode with accelerated attack at the cathodic metal

c) current will flow from the anode to the cathode with accelerated attack on the anode metal

d) current will flow from the cathode to the anode with accelerated attack at the cathodic metal

A

c) current will flow from the anode to the cathode with accelerated attack on the anode metal
A - C - A

58
Q

All repair work must be authorized by

a) the inspector

b) the inspector or the owner

c) the inspector or the engineer

d) the owner or the engineer

A

c) the inspector or the engineer

59
Q

Drag and drop the liquid penetrant processes into the box.

a) water washable

b) post-emulsifying

c) solvent removable

d) halogen free

d) temperature resistant

A

a) water washable

b) post-emulsifying

c) solvent removable

60
Q

What is the maximum interval for RBI assessments?

a) 5 years

b) 10 years

c) 20 years

d) 30 years

A

b) 10 years

61
Q

When a concrete ringwall is designed it shall not be less than

a) 24 inches thick

b) 18 inches thick

c) 12 inches thick

d) 6 inches thick

A

c) 12 inches thick

62
Q

What type of variable is a change in F-Number for a procedure qualification using GTAW?

a) essential

b) non-essential

c) supplementary essential

d) not a variable

A

a) essential

63
Q

What is the required preheat for repairs on a tank where the preheat method shall be used in lieu of PWHT?

a) 100 F

b) 140 F

c) 200 F

d) 300 F

A

d) 300 F

64
Q

Hot tapping and in-service welding safety aspects to be considered by an inspector are found in

a) API 2212A

b) API 2217

c) API 2201

d) API 577

A

c) API 2201

65
Q

Asphalt impregnated fiberboard

a) is recommended as a sealant for tanks sitting on concrete ringwall foundations

b) is not recommended as a sealant for tanks sitting on concrete foundations

c) is recommended as a sealant for tanks sitting on earth foundations

d) is not recommended as a sealant for tanks sitting on earth foundations

A

b) is not recommended as a sealant for tanks sitting on concrete foundations

66
Q

When the corrosion rate is not know , what is the maximum interval for an ultrasonic thickness inspection from outside the tank?

a) 5 years

b) 10 years

c) 15 years

d) 15 years or RCA/2N - whichever is less

A

a) 5 years

67
Q

Surface contour or roughness of a blast cleaned substrate surface, when viewed from the edge is called

a) floor pattern

b) anchor pattern

c) blast pattern

d) anode pattern

A

b) anchor pattern

68
Q

Fixed cone roof tanks typically are constructed up to

a) 100 feet in diameter and 64 feet in height

b) 200 feet in diameter and 64 feet in height

c) 300 feet in diameter and 64 feet in height

d) 400 feet in diameter and 64 feet in height

A

c) 300 feet in diameter and 64 feet in height

69
Q

API 650 Annex M provides requirements for

a) tanks with maximum design temperature not exceeding 200 F

b) tanks with maximum design temperature exceeding 200 F

c) stainless steel tanks

d) recommendations for the design and construction of under-bottom connections for storage tanks

A

b) tanks with maximum design temperature exceeding 200 F

70
Q

One of the primary reasons to conduct periodic scheduled inspections while the equipment is in operation is

a) safety

b) environmental concerns

c) productivity

d) reliability

A

a) safety

71
Q

What is the minimum thickness of the projection of the bottom plate as measured at the toe of the weld outside of the bottom to shell fillet weld in an in-service tank?

a) 0.1 in.

b) 3/16 in.

c) 0.25 in.

d) 3/8 in.

A

a) 0.1 in.

72
Q

Upon completion of welding, quality control items to assess regarding appearance and finish could include (choose all that apply)

a) size of welds confirmed to the drawing

b) temporary attachments removed and blended with the base metal, required NDE completed

c) welder stamping of welds

d) field hardness checks performed

A

a) Size of welds confirmed to the drawing

b) temporary attachments removed and blended with the base metal, required NDE completed

c) welder stamping of welds confirmed

d) field hardness checks performed

73
Q

The maximum out of plumbness of the shell after a new tank is erected shall be

a) 1/100 of the tank height

b) 1/100 of the tank or a maximum 5 inches

c) 1/200 of the tank height

d) 1/200 of the tank height or a maximum 5 inches

A

c) 1/200 of the tank height

74
Q

What percentage of a rim mounted primary seal should be out of an in-service tank at one time?

a) as much as is needed to be replaced

b) 75%

c) 50%

d) 25%

A

d) 25%

75
Q

The nominal thickness of the shell plate in the flush type cleanout fitting assembly shall be

a) at least as thick as the adjacent shell plate nominal thickness in the lowest shell course

b) at least as thick as the adjacent shell plate required thickness in the lowest shell course

c) at least as thick as the adjacent shell plate design thickness in the lowest shell course

d) thicker than the adjacent shell plate nominal thickness in the lowest shell course but with no more than a 3:1 taper between the materials

A

a) at least as thick as the adjacent shell plate nominal thickness in the lowest shell course

76
Q

What type of variable is a change in pipe diameter for SMAW qualification of a welder?

a) essential

b) non-essential

c) supplementary essential

d) not a variable

A

a) essential

77
Q

A design condition equal to the nominal thickness less any specified corrosion allowance is

a) remaining thickness

b) nominal thickness

c) retired thickness

d) corroded thickness

A

d) corroded thickness

78
Q

CDW welding in lieu of PWHT shall only be done with which welding processes?

a) SMAW

b) SMAW, FCAW

c) SMAW, GTAW, FCAW

d) SMAW, GTAW, GMAW, FCAW

A

d) SMAW, GTAW, GMAW, FCAW

79
Q

For lining application, the temperature should conform to the manufacturer’s recommended application ranges. As a general rule the surface temperature must be at least ____ above the dew point temperature in the tank and the relative humidity should be below 80% at the steel surface when a lining is being installed and curing.

a) 2 F

b) 5 F

c) 10 F

d) 15 F

A

b) 5 F

80
Q

Tanks that are typically used for pressure less than 5 lbf/in2 usually have what characteristics? Choose all that apply

a) Cylindrical shells

b) Cone roofs

c) Dome roofs

d) Geodesic dome roofs

A

a) Cylindrical shells

b) Cone roofs

c) Dome roofs

81
Q

Three plate laps shall be at least

a) 12 inches from the tank shell

b) 24 inches from the tank shell

c) 36 inches from the tank shel

d) lapped 12 inches onto the annular ring

A

a) 12 inches from the tank shell

82
Q

Geodesic domes may be applied to what diameter of tank?

a) 100 feet maximum

b) 200 feet maximum

c) 300 feet maximum

d) most diameter

A

d) most diameter

83
Q

Which of the following methods can be used for inspecting buried or or on-grade metallic components that may have become covered by shifting soil, or are soil-to-air interfaces? (Choose all that apply)

a) aboveground visual survey

b) smart pigging devices employing UT or MFL

c) pipe coating holiday survey

d) GWT as a screening tool

A

a) aboveground visual survey

b) smart pigging devices employing UT or MFL

c) pipe coating holiday survey

d) GWT as a screening tool

84
Q

In order to be exempted from the hydrogen bakeout required
after CDW welding in lieu of PWHT, the low hydrogen electrodes shall have an optional diffusible hydrogen designator

a) H4

b) H8

c) H16

d) H32

A

a) H4

85
Q

The design metal temperature is the lowest temperature to be considered in the design of a storage tank, and is _____ the lowest one day mean temperature.

a) 5 F below

b) 15 F below

c) 10 F above

d) 15F above

A

d) 15F above

86
Q

No known tank failures due to brittle failure have occurred at shell metal temperatures

a) => 100 F

b) => 80 F

c) => 70 F

d) => 60 F

A

d) =>60 F
equal or greater than 60 F

87
Q

F-Number groupings are based

a) essentially on the electrode coating

b) essentially on the electrode metallurgy

c) essentially on usability characteristics

d) essentially in functional characteristics

A

c) essentially on usability characteristics

88
Q

For material that has unknown toughness, the largest hot tap nozzle that could be installed is

a) NPS 12

b) NPS 6

c) NPS 4

d) NPS 2

A

c) NPS 4

89
Q

The most common type of storage tank is the

a) fixed cone roof tank

b) geodesic dome roof tank

c) internal floating roof tank

d) umbrella roof tank

A

a) fixed cone roof tank

90
Q

The electrode of an electrochemical cell at which a reduction reaction occurs is the

a) anode

b) cathode

c) galvanic point

d) concentration point

A

b) cathode

91
Q

The acronym RAGAGEP refers to

a) Recognized and Generally Accepted Good Engineering Practice

b) Recognized and Generally Accepted Great Engineering Practice

c) Readily and Generally Accepted Good Engineering Practice

d) Recognized and Geologically Good Engineering Practice

A

a) Recognized and Generally Accepted Good Engineering Practice

92
Q

For new tanks constructed to API 650, the minimum offset between vertical seams in adjacent shell courses shall be

a) 12 inches

b) 3t

c) 5t

d) one half of the plate length

A

c) 5t

93
Q

Acceptance criteria for RT performed on an existing tank shall be in accordance with

a) API 653

b) API 650

c) ASME Section V

d) ASME Section IX

A

b) API 650

94
Q

P-Numbers are assigned to base metals for the purpose of

a) reducing the number of welding procedures

b) reducing the number of welders

c) reducing the number of welding materials

d) reducing the number of welding procedure qualifications

A

d) reducing the number of welding procedure qualifications

95
Q

API 650 shell plates are limited to a maximum of

a) 1 inch

b) 1.75 inch

c) 2.25 inch

d) 4.0 inch

A

b) 1.75 inch

96
Q

After the finished repair weld has cooled to ambient temperature, the final temper bead reinforcement layer shall be

a) examined with MT

b) gouged off

c) ground substantially flush

d) seal welded

A

c) ground substantially flush

97
Q

For welds on a new tank, on plate that is 3/16 thick the minimum fillet weld size is

a) a full fillet weld is required

b) a fillet weld of at least 0.125 in. is required

c) the plate shall be butt welded

d) the minimum fillet weld size shall not be less than one third of the plate thickness

A

a) a full fillet weld is required

98
Q

The term “atmospheric pressure” as used in API 575 includes tanks with an internal pressure up to

a) atmospheric pressure

b) 2.5 psi

c) 5 psi

d) 15 psi

A

b) 2.5 psi

99
Q

When a WPS including notch toughness testing is prepared by an organization, it must address as a minimum

a) the essential variables for each process to be used in production welding

b) the essential and non-essential variables for each process to be used in production welding

c) the essential, non-essential, and supplementary essential variables for each process to be used in production welding

d) the contents of the PQR

A

c) the essential, non-essential, and supplementary essential variables for each process to be used in production welding

100
Q

The anchor pattern required for linings is typically between

a) 1.5 to 2 mils

b) 1.5 to 4 mils

c) 1.5 to 6 mils

d) 1.5 to 8 mils

A

b) 1.5 to 4 mils

101
Q

Which of the following is true regarding tanks to be built by API 650?

a) rimmed or capped steels are not permitted

b) use of cast iron for any part of the tank is prohibited

c) because of hydrogen embrittlement and toxicity concerns, cadmium plated components shall not be used

d) material not produced to specification listen in API 650 may still be used provided it meets the requirements of an applicable material specification listed in API 650 and the material’s use is approved by the storage tank engineer

A

a) rimmed or capped steels are not permitted

102
Q

A storage tank has holidays in the coating on the roof. The tank operates at 220F. Which of the following statements is true regarding the expected damage mechanism?

a) proper grounding will eliminate the problem

b) corrosion will tend to accelerate in the breaks in the coating

c) corrosion will be generalized

d) atmospheric corrosion does not happen at 220 F

A

b) corrosion will tend to accelerate at the breaks in the coating

103
Q

When is the next required visual external inspection of a tank with the following information?
Diameter: 180 feet
Measured shell thickness: 0.75”
Minimum required thickness: 0.56”
Established corrosion rate: 0.005 in./year

a) 2 years

b) 4 years

c) 5 years

d) 9 years

A

measured shell thickness - minimum required thickness divided by 4 times corrosion rate
Or 5 years whichever is less

c) 5 years

104
Q

A tank has experienced corrosion over its service life. The shell thickness of the first course at the last inspection 9 years ago was 0.625 inches.
The current measured thickness found by inspection is 0.4375 in. What is the corrosion rate that can be used in interval calculations?

a) 0.02 in. / year

b) 0.03 in. / year

c) 0.05 in. / year

d) 0.08 in. / year

A

a) 0.02 in. / year

105
Q

Match the following terms to the correct definitions:

the tank(s) for which corrosion rates are not known

the tank(s) for which corrosion rates and service history are known and documented

methodology whereby flaws contained within a structure are assessed in order to determine the adequacy of the flawed structure for continued use without imminent failure

the process by which corrosion rate and inspection intervals are established for a candidate tank using corrosion rate and service history from a control tank for the purpose of establishing the next inspection date

Candidate tank

control tank

fitness for service assessment

similar service assessment

A

Candidate tank - the tank where corrosion rate is not known

Control tank - the tank(s) for which corrosion rates and service history are know and documented

Fitness for service assessment - a methodology whereby flaws contained within a structure are assessed in order to determine the adequacy of the flawed structure for continued service without imminent failure

Similar service assessment - the process by which corrosion rate and inspection intervals are established for a candidate tank using corrosion rate and service history from a control tank for the purpose of establishing the next inspection date

106
Q

When inspecting an inservice tank, an inspector notices that the roof rim thickness has experienced corrosion.
Roof rims shall be replaced when the roof rim thickness

a) is 0.10 in. thick

b) is < 0.10 in. thick

c) is > 0.10 in. thick

d) interferes with the operation of the tank

A

b) is <0.10 in. thick
less than 0.10 in. thick

107
Q

Which of the following are advantages of thin-film linings?
(choose all that apply)

a) initial cost is typically higher than thick film linings

b) most thin-film epoxy linings exhibit good flexibility

c) generally more accurate MFL floor scans

d) it is often easier to remove thin-film lining at the end of its useful life

A

b) most thin film linings exhibit good flexibility

c) generally more accurate MFL floor scans

d) it is often easier to remove a thin-film lining at the end of its useful life

108
Q

When performing an inspection on a fixed roof tank, planks that are long enough to span at least ____ rafters should be laid and used as walkways until the safety of the roof is determined.

a) 1

b) 2

c) 3

d) 4

A

b) 2

109
Q

Which of the following would be considered a major alteration/ or major repair? (choose all that apply)

a) Installing a bottom penetration within 12 inches of the shell

b) removing and replacing a shell plate beneath the design liquid level where the longest dimension of the replacement plate is 14 inches

c) removing or replacing annular plate ring material where the longest dimension of the replacement plate is 8 inches

d) complete removal and replacement of 18 inches of vertical weld joining shell plates

A

a) installing a bottom penetration within 12 inches of the shell

b) removing and replacing a shell plate beneath the design liquid level where the longest dimension of the replacement plate is 14 inches

d) complete removal and replacement of 18 inches of vertical weld joining shell plates

110
Q

A tank has experienced corrosion during 20 years of service. During the recent inspection it was determined that a new bottom needs to be installed. Will the tank need to be hydrotested after the new bottom is installed to be compliant with API 653?

a) yes

b) no

c) only if the owner requests it

d) no, unless the inspector requests it

A

a) Yes

111
Q

MIC is usually found

a) in aqueous environments

b) in dark environments

c) in moderate temperature environments

d) in high salinity environments

A

a) in aqueous environments

API 653 (3 decks)

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