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API 653 > API 653 > Flashcards

API 653 Flashcards

Learn API 653

1
Q

API 653 covers tanks built to what API codes?

A

API 650 & 12C 653 - 1.1.1

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2
Q

API 653 recognizes FFS API 579 assesment T/F?

A

TRUE 653 - 1.1.6

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3
Q

If regulations of 653 are more strict than local AHJ regulations, which governs?

A

API 653 653 - 1.3

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4
Q

What is an alteration?

A

Any work that changes physical dimensions/configuration 653 - 3.1

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5
Q

Where is the critical zone?

A

annular plate within 3” of the inside of shell 653 - 3.10

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6
Q

What is considered a major repair/alteration?

A

shell penetration > NPS 12; bottom penetration within 12” of shell; R&R shell plate with any dimension >12”; R&R annular plate with any dimension >12” 653 - 3.20

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7
Q

What is considered a major repair/alteration?

A

removal of vert. 12” weld on shell plates or on annular ring; a whole new bottom; R&R 50% weld between shell/annular ring; jacking tank shell 653 - 3.20

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8
Q

What is considered a repair?

A

work necessary to restore a tank to safe operation (includes major repair scope) 653 - 3.26

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9
Q

What is considered a repair organization?

A

owner/operator who repairs/alters to 653; contractor who’s quals are acceptable to owner/user and 653; one who is not prohibited by AHJ and 653 653 - 3.27

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10
Q

What is a storage tank engineer?

A

one or more persons acceptable to owner/user regarded as composite of all entities to properly assess req’s 653 - 3.30

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11
Q

Roof plates corroded to what condition SHALL be replaced?

A

0.09” avg thickness in any 100 in^2 or holed through 653 - 4.2.1.2

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12
Q

When evaluating alterations to a tank roof, what standard applies?

A

Current applicable standard API 650 Annex F 653 - 4.2.4.1

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13
Q

Before changing service to an elevated temp of >200F, what std shall apply?

A

API 650, Annex M - 653 - 4.2.4.3

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14
Q

Before changing service to a lower temp, what std shall apply?

A

Currrent applicable std 653 - 4.2.4.4

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15
Q

What are options if req’s of 653 cannot be satisfied?

A

Damaged areas shall be repaired; liquid level reduced; tank retired 653 - 4.3.1.5

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16
Q

Shell corrosion - critical Length L is determined by what formula, not to exceed?

A

L = 3.7sqrt(DT2) D = tank diam in FEET; T2 least thickness in INCHES; L max = 40” 653 - 4.3.2.1

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17
Q

Shell corrosion - widely scattered pits may be ignored, provided that?

A

No pit is >50% of Tmin, sum of pits vert dim’s

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18
Q

Shell corrosion - Tmin shall not be less than X inches for any tank course?

A

0.1” 653 - 4.3.3.1

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19
Q

Shell welds - cracks in the shell to bottom weld SHALL be removed (T/F)?

A

TRUE 653 - 4.3.6

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20
Q

Bottom - assesment period shall be ?

A

Less than or = to shell interval

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21
Q

Bottom - Tmin for bottom plate (minimum remaining thickness)

A

Reference 653 - 4.4.5.1

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22
Q

Bottom - if mim thickness will be

A

Lined, repaired, replaced or interval to next internal insp. Reduced 653 - 4.4.5.3

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23
Q

Bottom - critical zone Tmin SHALL be the smaller of?

A

50% of original thickness or 50% of Tmin of bottom shell; but not less than 0.1” 653 - 4.4.5.4

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24
Q

Bottom - thickness of projection of bottom plate beyond shell shall not be

A

0.1” thick and horiz. projection beyond shell shall be >= 3/8” 653 - 4.4.5.7

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25
Q

Foundation - principle causes of foundation deterioration include?

A

settlement, erosion, cracking, and conrete deterioration 653 - 4.5.1.1

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26
Q

Brittle Fracture - once a tank has withstood X & Y, the risk of brittle fracture is low?

A

Combined effects of max liquid level and lowest operating temp 653 - 5.2.2

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27
Q

Brittle Fracture - any change in service must be evaluated for brittle fracture risk (T/F)?

A

TRUE 653 - 5.2.3

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28
Q

Brittle Fracture - if shell is no thicker than 0.25, 0.5, 0.625 or 0.75 , brittle fracture risk is low?

A

0.5” 653 - 5.3.5

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29
Q

Brittle Fracture - no known brittle fracture above shell temp of 32F, 50F, 60F, or 70F?

A

60F 653 - 5.3.6

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30
Q

Inspection - routine in-service visual inspections shall be made every week, month, or year?

A

Shall not exceed one month interval 653 -6.3.1.2

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31
Q

Inspection - Tanks shall be given a visual external by an AI at least?

A

Every 5 years or RCA/4N years

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32
Q

Inspection - UT of shell thickness - when shell corrosion rate is not known, UT shall be done?

A

At least every 5 years 653 - 6.3.3.2

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33
Q

Inspection - UT of shell thickness - when shell corrosion rate is known, UT shall be done?

A

15 years or RCA/2N years, whichever is smaller 653 - 6.3.3.2

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34
Q

Inspection - Initial internal interval shall not exceed 3, 5, 10 or 15 years?

A

10 years, unless safeguards are added per Table 6.1 653 - 6.4.2.1.1

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35
Q

Material - new materials used for repair/alt/reconstruction shall conform to?

A

Current applicable standard 653 - 7.2

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36
Q

Material - shell/bottom plate material shall be identified by?

A

Original contract drawings, API nameplates, or other suitable docs 653 - 7.3.1

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37
Q

Material - flange mat’l shall meet minimum req’s of as built or current applicable std?

A

The “as built” standard 653 - 7.3.3.1

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38
Q

Design - shell thickness design shall be based on numbers taken within 30, 60, 90 or 180 days?

A

Within 180 days 653 - 8.4.1

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39
Q

Design - shell penetrations shall be design/welded to the as built or current applicable std?

A

Current applicable std 653 - 8.5.1

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40
Q

Tank repair - all repair work must be authorized prior to work by whom?

A

Authorized Inspector OR Tank Engineer 653 - 9.1.3

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41
Q

Tank Repair - Alterations must be approved by the AI, Tank Engineer or both?

A

Tank Engineer only 653 - 9.1.3

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42
Q

Tank Repair - Inspection hold points will be designated by AI, Tank Engineer or both?

A

AI only 653 - 9.1.3

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43
Q

Tank Repair - limited or routine repairs may be authorized by AI, Tank Engineer or both?

A

AI may authorize repairs provided no hydro or engineering evaluation is req’d. 653 - 9.1.3

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44
Q

Tank Repair - design, work execution, materials, procedures, NDE must be approved by AI, Tank Engineer or both?

A

AI or Tank Engineer 653 - 9.1.4

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45
Q

Tank Repair - Repair/alteration work shall be approved at HOLD points/after work completion by AI, Tank Eng or both?

A

AI or Tank Engineer 653 - 9.1.4

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46
Q

Shell repair - minimum dimension for a replacement shell plate is 4”, 6”, 12”?

A

12” or 12 x thickness of shell, whichever is greater 653 - 9.2.2

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47
Q

Shelll repair - replacement shell plates may be what shapes?

A

circular, oblong, square w/rounded corners, rectangular w/rounded corners 653 - 9.2.2.1

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48
Q

Shell repair - prior to welding new vertical joints, the horiz. Welds shall be cut 3”, 6”, 9” or 12” beyond the joint?

A

12” beyond vertical joint and vert. must be done before horiz. 653 - 9.2.2.2

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49
Q

Door sheet - if a vert cut crosses existing horiz weld, the back gouged root pass and final pass shall be PT, MT or both?

A

PT or MT 653 - 9.2.4.5

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50
Q

Door sheet - if a vert cut crosses existing horiz weld, the existing seam shall be MT, PT or both for how far on both sides?

A

MT or PT for 6” on both sides 653 - 9.2.4.5

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51
Q

Shell repairs - lap welded patch plates are acceptable on butt welded, lap welded, riveted tank or all?

A

All tanks when specified by owner 653 - 9.3.1

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52
Q

Shell repairs - lap welded patch plates shall not be used on shells > than 0.375”, 0.5”, 0.625” or 0.75”?

A

0.5” thick 653 - 9.3.1.2

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53
Q

Shell repairs - repair plate corners shall be rounded to a minimum radius of 0.5”, 1”, 1.5” or 2”?

A

2” minimum radius 653 - 9.3.1.4

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54
Q

Shell repair - repair plate may cross any ground butt welded seam provided it overlaps minimum 3”, 6”, 9” or 12”?

A

6” beyond weld seam 653 - 9.3.1.5

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55
Q

Shell repair - maximum dimension of a repair plate is 2’x3’, 3’x4’, 4’x6’ or full shell course height x 8’?

A

4’x6’ 653 - 9.3.1.7

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56
Q

Shell repair - the minimum dimension of a repair plate is 4”, 6”, 8”, or 12”?

A

4” minimum dimension 653 - 9.3.1.7

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57
Q

Shell repair - repair plate shall conform to as-built std with a joint efficiency or 0.35, 0.5, 0.7, or 0.85?

A

Joint efficiency not exceeding 0.7 653 - 9.3.2.3

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58
Q

Shell repair - repair plate shall conform to as-built std with a joint efficiency or 0.35, 0.5, 0.7, or 0.85?

A

Joint efficiency not exceeding 0.35 653 - 9.3.3.1

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59
Q

Shell penetration - reinforcing plates may be added to both outside and inside of tank provided nozzle projection (T/F)?

A

TRUE - must have adequate nozzle projection into tank 653 - 9.7.3

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60
Q

Shell penetration - penetrations larger than NPS 1.5, 2, 4, or 6” shall be installed with an insert plate

A

NPS 2” 653 - 9.8.6

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61
Q

Shell penetration - completed splice welds on bottom plate when installing a new bottom shall be PT, MT or both?

A

MT 653 - 9.9.4 c)

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62
Q

Tank Bottom - min dimension for a welded on patch plate that overlaps a bottom seam shall be 4”, 6”, or 12”

A

12” 653 - 9.10.1.1

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63
Q

Tank Bottom - a patch plate that does not cross a seam may be as small as 4”, 6” or 9” diameter

A

6” diameter, must overlap any corroded area by 2” 653 - 9.10.1.1

64
Q

Tank Bottom - max thickness for welded on patch plates in the critical zone is 1/8”, 3/16” or 1/4”

A

1/4” 653 - 9.10.1.2

65
Q

Tank bottom - butt welding a bottom patch plate to another is permitted in the critical zone (T/F)?

A

False - 653 - 9.10.1.2 d)

66
Q

Tank bottom - welded on patch plates over existing patches are not allowed in the critical zone (T/F)?

A

True 653 - 9.10.1.2 e)

67
Q

Tank bottom - new fillet welds on a tombstone patch plate shall be greater of Xin or Yt from vert weld joints

A

3in and 5*thickness

68
Q

Tank bottom - use of welded on patch plates that do not meet API 653 is permitted if AI, Tank Engineer or both agree?

A

Tank Engineer only 653 - 9.10.1.3

69
Q

Tank bottom - new bottom - shells made of 50ksi yield or less, existing shell penetrations need not be raised if?

A

min 4” between weld toes, low H electrodes, weld toes blend ground, min 3” or 2.5t between self-reinforced penetrations and bottom 653 - 9.10.2.7 b)

70
Q

Tank bottom - weld toes shall be blend ground from 3 to 9 o’clock, 4 to 8 o’clock, or 5 to 7 o’ clock

A

4 to 8 o’clock for circular reinforcing plates 653 - 9.10.2.7 d)

71
Q

Tank bottom - weld toes shall be blend ground only on lower horizontal length of diamond shaped (T/F)?

A

True, also blend grind inside/outside of shell to bottom weld min of one penetration diam length on both sides pene. 653 -9.10.2.7 d)

72
Q

Tank bottom - blend ground welds shall be MT, PT or both before, after or before & after hydro test?

A

MT only before AND after hydro 653 9.10.2.7 e)

73
Q

Tank roof - minimum thickness of new roof plates shall be 1/8”, 3/16”, 1/4”, or 5/16” ?

A

3/16” + C.A. 653 - 9.11.2.1

74
Q

Tank roof - rim mounted seal system shall have no more than 10%, 15%, 25% or 50% removed at one time for repair

A

25% 653 - 9.13.1

75
Q

Tank roof - if roof rim thickness is less than 0.1”, 0.125”, 3/16” or 1/4” it shall be replaced

A

0.1”, new roof rim shall be 3/16” minimum 653 - 9.13.6.2

76
Q

Hot Tap - min liquid level above hot tap shall be 1’, 3’, 5’ or 10’ during hot tapping?

A

3’ 653 - 9.14.1.2

77
Q

Hot Tap - hot taps are permitted on roof/within vapor space only with necessary permits/approval from owner/user HSE dept mgr (T/F)?

A

False - hot taps are not permitted on roof or in vapor space 653 - 9.14.1.3

78
Q

Hot Tap - procedure shall be documented and carried out according to practices given in API 653, 2201, 2214 or 2271?

A

API 2201 653 - 9.14.2

79
Q

Hot Tap - minimum spacing between hot tap and any nozzle shall be 6”, 12”, 12shell thickness or sqrt RT (tank shell radius INCHES x shell thickness)

A

Sqrt (R*T) where R is tank shell radius in inches and t is shell thickness in inches 653 - 9.14.3.1

80
Q

Hot Tap - after reinforcing pad has been welded to the shell, pad shall be pneumatically tested to 15psi, procedure in API 650, or visual only

A

Pad shall be pneumatically tested per API 650 7.3.4 653 - 9.14.5.3

81
Q

Reconstruction - reconstruction work must be authorized by the owner/user, AI, Tank engineer or repair organization, before work begins?

A

Reconstruction work must be authorized by the AI or Tank Engineer 653 - 10.1.3

82
Q

Reconstruction - the AI, Tank Engineer or both shall approve reconstruction work at designated hold points and after construction is completed?

A

AI or Tank Engineer can approve 653 - 10.1.4

83
Q

Reconstruction -no welding shall be performed when base metal temperature is below 0F, 20F, 32F, 60F?

A

0F 653 - 10.4.2.3

84
Q

Reconstruction - when base metal temp is 0F to 32F or thickness is >1”, base metal within 3”, 6”, 8” or 12” must be heated to about 140F?

A

3” 653 - 10.4.2.3

85
Q

Reconstruction - maximum permissible undercut in vertical and horizontal seams is 1/16”, 1/32” or 1/64”?

A

1/64” V and 1/32” H 653 - 10.4.2.4

86
Q

Reconstruction - tack welds are permissible to remain in vertical tank joints with manual welding process (T/F)?

A

False, must be removed. 653 - 10.4.2.7

87
Q

Reconstruction - it is permissible to leave weldable primer coatings in place provided they are on the WPQ test (T/F)?

A

True, all other coatings shall be removed. 653 - 10.4.2.8

88
Q

Reconstruction - misalignment of vertical joins shall not be more than 10%, 15%, 20% or 1/8”?

A

10% of plate thickness with a max of 1/8” 653 - 10.4.4.1

89
Q

Reconstruction - for shell plates >1.5”, multipass welds and minimum pre-heat of 200, 250 300, 350F is required?

A

200F 653 - 10.4.4.3

90
Q

Dimensional tolerances - measurements shall be taken before, after or before and after a hydrostatic test of a reconstructed tank?

A

Before only 653 - 10.5.1.2

91
Q

Dimensional tolerances - max out of plumbness of top of shell to bottom shall not exceed 1/100, 1/150, 1/200 or 1/250 of total height?

A

1/100, not to exceed 5” 653 - 10.5.2.1

92
Q

Dimensional tolerances - with horizontal sweep board, 36” long, peaking shall not exceed 1/8”, 1/4”, 3/8” or 1/2”?

A

1/2” 653 - 10.5.4

93
Q

Dimensional tolerances - with vertical sweep board 36” long, banding shall not exceed 1/2”, 3/4”, 1” or 1.5”?

A

1” 653 - 10.5.5

94
Q

Dimensional tolerance - where foundations true to a horiz. Plane are specified part 1: where concrete ringwalls are provided, should be level to?

A

1/8” in any 30’ circumference and within +/- 1/4” in total circumference from average elev. 653 - 10.5.6.2 a)

95
Q

Dimensional tolerance - where foundations true to a horiz. Plane are specified part 2: where concrete ringwalls are NOT provided, should be level to?

A

1/8” in any 30’ circumference and within +/- 1/2” in total circumference from average elev. 653 - 10.5.6.2 b)

96
Q

Welding - welding procedures for handrails, platforms, appertunances shall comply with 653, 650 or AWS D1.1, AWS D1.6 or ASME?

A

AWS D1.1, AWS D1.6 and ASME codes apply 653 - 11.1

97
Q

Welding - which welds do not require welder ID? Roof plate, bottom plate, flange-to-nozzle neck, top ring to shell

A

roof plate and flange nozzle to neck welds do not require ID 653 - 11.2.2

98
Q

Welding - Pre-heat and/or controlled deposition welding methods can be used in lieu of PWHT if approved by the AI, Tank Engineer, owner/operator?

A

Tank Engineer and owner operator both and in writing 653 - 11.3

99
Q

Welding - preheating where impact test NOT req’d - limited to P1 mat’ls and must maintain 200, 300, 350, or 375F at 4” or 4xT both sides of groove?

A

300F - 653 - 11.3.1 d)

100
Q

Welding - controlled deposition welding method is used when an impact test IS req’d - (T/F)?

A

True 653 - 11.3.2

101
Q

NDE - nozzle and reinforcement plate to shell welds shall be examined by PT, MT or both?

A

PT or MT 653 - 12.1.2.3

102
Q

NDE - stress relieved assemblies shall be examined by MT, PT, or both before, after or before and after hydrostatic testing?

A

PT or MT, after PWHT and before hydro 653 - 12.1.2.4

103
Q

NDE - completed weld repairs of butt welds shall be examined 10%, 25%, 50% or full length by RT or UT methods?

A

Full length RT or UT 653 - 12.1.3.2

104
Q

NDE - welds of permanent attachments shall be examined visually, by PT or MT?

A

Visually 653 - 12.1.4.1

105
Q

NDE - completed welds of new permanent attachments shall be examined visually, PT or MT?

A

MT or PT if purchaser approves 653- 12.1.4.2

106
Q

NDE - new welding on shell to bottom joint shall be examined full length by UT, MT, right angle vacuum box or light diesel oil?

A

Right angle vacuum box or light film diesel oil 653 - 12.1.6

107
Q

NDE - repaired areas of bottom plate shall be examined by MT, PT, vacuum box or tracer gas detector?

A

MT or PT and vacuum box or tracer gas 653 - 12.1.7.3

108
Q

NDE - the owner user, AI orTank Engineer shall determine the extent of further examination req’d beyond 653

A

Owner user w/consent of contractor 653 - 12.2.1.5

109
Q

NDE - radiographs and radiograph records of all repaired welds shall be marked with WR, R?

A

Letter ‘R’ only 653 - 12.2.3.2

110
Q

NDE - a hydrostatic test for 24hours shall be performed for?

A

Reconstructed tank, for major repair/alteration (exemptions apply), when engineering eval req’s it for severe service 653 - 12.3.1

111
Q

NDE - a hydrostatic test can be exempted if the AI, Tank Engineer or owner/user agrees in writing?

A

Tank Engineer and owner/user 653 - 12.3.2.2

112
Q

NDE - Initital settlement survey, prior to tank filling, must be completed with a minimum of 4, 8, 12 or 16 points with max circum. spacing of of 32 ft?

A

Mimimum 8 points with max spacing 32 feet N=D/10 653 - 12.5.2

113
Q

Marking & Records - nameplates shall be of corrosion resistant material stamped with letters not less than 5/32”, 3/16”, 1/4”, or 5/16”?

A

5/32” 653 - 13.1.1.1

114
Q

Tank Settlement - maximum spacing of bottom settlement measurement points radially outward is 10’, 15’ or 20’?

A

10’ 653 - Annex B Fig B.2

115
Q

Definiton - The owner/user, AI or manufacturer is responsible for compliance with 650?

A

Manufacturer 650 - 1.3.2

116
Q

Terms - Design metal temp shall be assumed to be 0, 10, 15 or 20F above the lowest one-day mean ambient temperature of the installed location?

A

15F above 650 - 3.6

117
Q

Material - shell plate underrun not more than 0.01”, or 5%, 10% or 12% of thickness shall be permitted?

A

0.01” is max underrun regardless of shell thickness 650 - 4.2.1.2.3

118
Q

Material - shell plates shall be limited to max thickness of 1.5”, 1.75”, 1.875” or 2”?

A

1.75” 650 - 4.2.1.4

119
Q

Material - an impact test shall be performed on one, two or three specimens taken from a single test coupon?

A

Three 650 - 4.2.9.3

120
Q

Design - shell to bottom fillet welds shall not be more than 3/8”, 1/2” or 3/4” nor less than nominal thickness of thinner of two plates

A

1/2” 650 - 5.1.5.7

121
Q

Design - design external pressure shall not be less than 1, 2, 5, or 10 inches of water?

A

1 inch of water 650 - 5.2.1

122
Q

Design - internal floating roof uniform live load shall be 5, 7.5, 10, 12.5 psi if no auto drains and 2.5, 5, 7.5 and 10psi if auto drains are provided?

A

12.5 psi if no auto drains, 5 psi if auto drains 650 - 5.2.1 e)

123
Q

Design - internal floating roof point load shall be 200, 250, 375 or 500lbf or 1sq ft?

A

500 lbf per sq ft 650 - 5.2.1 e)

124
Q

Design - external roof live load projected on horizontal area shall be 10, 15, 20 or 25 lbf per sq ft?

A

20 lbf per sq ft 650 - 5.2.1 e)

125
Q

Design - bottom plates shall have a corroded thickness of not less than 0.1”, 0.125”, 0.236” or 0.25”?

A

0.236” (6mm) 650 - 5.4.1

126
Q

Design - bottom plates shall project beyond the shell a minimum 0.5”, 1”, 1.5” or 2”?

A

2” 650 - 5.4.2

127
Q

Design - the minimum shell thickness of a 150’ diam tank shall be 3/16”, 1/4”, 5/16” or 3/8”?

A

5/16” 650 - 5.6.1.1

128
Q

Design - openings in tank shells greater than NPS 1.5”, 2”, 4” or 6” shall be reinforced?

A

NPS 2 650 - 5.7.2.1

129
Q

Design - reinforcing plates shall be provided with a 1/8”, 1/4” or 3/8” telltale hole?

A

1/4” 650 - 5.7.2.10

130
Q

Design - roof plates shall have a nominal thickness of not less than 3/16”, 1/4” or 3/8”?

A

3/16” 650 - 5.10.2.2

131
Q

Erection - the use of oxyfuel welding process is permitted if impact testing of material is req’d (T/F)?

A

False. Oxyfuel is not permitted if impact testing is req’d. 7.2.1.1

132
Q

Erection - preheat shall be applied (when req’d) and maintained a minimum of 2”, 3”, 6” or 12” of the welding area?

A

3” 650 - 7.2.1.3

133
Q

Erection - tack welds in vertical joints can remain in a manual weld process provided 100% RT or UT is performed (T/F)?

A

False. Tack welds shall be removed in all manual welded vert joints 650 - 7.2.1.9

134
Q

Erection - the finished tank bottom shall be examined visually, with vacuum box, tracer gas test

A

Visually and vacuum box or tracer gas 650 - 7.3.3

135
Q

Erection - internal bottom elevation measurements shall be taken prior to, after or both prior to and after the hydrostatic test?

A

Before and After hydro 650 - 7.3.6.8

136
Q

Erection - completed defect repairs shall be approved by the manufacturer, Tank engineer or purchaser’s inspector?

A

Purchaser’s inspector 650 - 7.4.1

137
Q

Erection - maximum out of plumbness of top of the shell relative to bottom of shell shall not exceed 1/100, 1/200 or 1/250 of total tank height?

A

1/200 650 - 7.5.2

138
Q

NDE - each radiograph shall show a minimum of 3”, 6”, or 12” of weld length?

A

6” 650 - 8.1.2.8

139
Q

NDE - ASME Section V req’s in T-274 are used only as a guide, final acceptance is based on image and specificed hole visibility (T/F)?

A

True 650 8.1.3.3

140
Q

NDE - manufacturer shall certify each visual examiner can read a Jaeger type I, II or III chart at a distance of 1 ft or more?

A

Jaeger Type II, annual check, also color contrast 650 - 8.5.1

141
Q

NDE - a partial vacuum minimum of 3, 4, 5 or 10psi shall be performed witn a 6in x 30in vacuum box?

A

3 to 5 psi vacuum gage shall be used 650 - 8.6.3

142
Q

NDE - bottom metal surface temp shall be between 32-100F, 32-125F, 40-100F or 40-125F for vacuum box testing

A

40-125F 650 - 8.6.6

143
Q

NDE - a minimum light intensity of 1, 10, 100, 1000 Lux is req’d for vacuum box testing

A

1000 Lux (100 foot candle)

144
Q

WPS and WQ - if a protective coating has been applied to weld edge prep, it shall be removed,, treated as an essential variable or non-essential?

A

Included as an essential variable 650 - 9.2.1.4

145
Q

WPS and WQ - all materials to be used at a design metal temperature below 20, 32, 40 or 50F, the WPQ for vert joints shall include impact tests

A

50F 650 - 9.2.2.3

146
Q

WPS and WQ - when design metal temp is below 0, 15, 20, 32F, impact test shall be made for all WPQ

A

20F 650 - 9.2.2.4

147
Q

WPS and WQ - welds not requiring welder identification include- roof plate welds, flange to nozzle neck welds, bottom plate lap welds, temporary lugs

A

roof plate and flange to nozzle neck welds 650 - 9.4

148
Q

Ext floating roof - deck plates shall have a minimum thickness of 1/8”, 5/32”, 3/16” or 1/4” ?

A

3/16” 650 - C.3.3.2

149
Q

Ext floating roof - floating roofs shall have sufficient buoyancy to remain afloat on liquid with SG of 0.7, 1 or 1.1 with drains inoperative

A

SG of 0.7 or minimum design SG 650 - C.3.4

150
Q

Ext floating roof - each pontoon compartment shall be provided with a manhole minimal nominal size of NPS 20, 24, 30 or 36?

A

NPS 20 650 - C.3.5

151
Q

Ext floating roof - roof leg landing pads must have a minimum dimenions of 1/4” x 12” diam, 3/8” x 12” diam, 1/4” x 14” diam or 3/8” x 14” diam

A

3/8” x 14” diam 650 - C.3.10.5

152
Q

Ext floating roof - roof manholes shall be a minimum of NPS 20, 24, 30 or 36 with a minimum of 1 or 2 for diam

A

NPS 24, minimum two manholes 650 - C.3.11

153
Q

Internal floating roof - maximum spacing between vents shall be 10, 20, 25 or 32 ft with no fewer than four per tank

A

32 ft 650 - H.5.2.2.1

154
Q

Internal floating roof - a minimum of 1 or 2 fixed roof manholes shall be provided with a nominal opening of 24” or larger

A

one 650 -H.5.5.1

155
Q

UT in lieu of RT - alternative method is limited to joints where the thickness of the thinner of two memmbers joined is >= 1/4”, 3/8” or 1/2”

A

Greater than or equal to 3/8” 650 - U.1.1

API 653 (1 decks)

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