Understanding API ICP653 Reading 7-Worksheet-04 Part1

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4.3.2 Actual Thickness Determination: a. See Inspection of Corrosion Areas (Fig. 4-1, Page 4-2). b. The controlling thickness in each shell course, where corroded areas of considerable size occur, must be determined. NOTE: This section deals with the averaging of corroded areas. This is not an exact science and should be used only when an area is questionable for repair. For exam purposes, you will be supplied with 't 2 " and the diameter of the tank. L =3.7√(Dt 2 ) Charlie Chong/ Fion Zhang
EXAMPLE: A tank 38 feet tall, 150 feet diameter, displays a large area of corrosion. The corroded area measures approximately 23 inches wide and 21 inches in height. The inspector has determined the least thickness in the area of corrosion to be 3/16 or .187 inches. Calculate the "L" length. ANSWER: L = 3.7√Dt 2 L = 3.7 √(150 X .187) L = 3.7 √28.05 L = 3.7 X 5.30 L = 19.61 inches or 19 5/8 inches approx. Note: “The corroded area measures approximately 23 inches wide and 21 inches in height.” does not have any impact on the calculation! Charlie Chong/ Fion Zhang
Page 1 and 2: Understandings API ICP653 Reading 7
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Page 7 and 8: Charlie Chong/ Fion Zhang Fion Zhan
Page 9 and 10: API 653 Exam Administration -- Publ
Page 11 and 12: • API Recommended Practice 575, I
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Page 19 and 20: 闭门练功 Charlie Chong/ Fion
Page 21 and 22: 1.1 General 1.1.1 This standard cov
Page 23 and 24: 1.4 Safe Working Practices Safety p
Page 25 and 26: c. An owner or operator of one or m
Page 27 and 28: 3.9 critical zone: The portion of t
Page 29 and 30: 3.16 repair organization: An organi
Page 31 and 32: organizations Charlie Chong/ Fion Z
Page 33 and 34: 3.21 as-built standard: The standar
Page 35 and 36: 3.23 major alteration or major repa
Page 37 and 38: g. Removing and replacing part of t
Page 39 and 40: SECTION 4 - SUITABILITY FOR SERVICE
Page 41 and 42: 4.2 Tank Roof Evaluation (General)
Page 43 and 44: 4.2.4 Change of Service 4.2.4.1 Int
Page 45: 4.3.1.3 Shell corrosion occurs in m
Page 49 and 50: 4.3.3 Minimum Thickness Calculation
Page 51 and 52: G = Highest specific gravity of the
Page 53 and 54: Sample problem for minimum thicknes
Page 55 and 56: Maximum Allowable Fill Height Calcu
Page 57 and 58: Sample problem for maximum allowabl
Page 59 and 60: Joint Efficiency for the plate For
Page 61 and 62: For Riveted Tank E is 1.0 for shell
Page 63 and 64: Table 4.3—Joint Efficiencies for
Page 65 and 66: B. Tank Shells 1. See prior comment
Page 67 and 68: 4.3.6 Flaws cracks and laminations
Page 69 and 70: 4.4 Tank Bottom Evaluation 4.4.1 Ge
Page 71 and 72: 4.4.6 Bottom Measurements Methods (
Page 73 and 74: 4.4.7.4 Critical zone thickness is
Page 75 and 76: 4.4.8 Minimum "t" - Annular Plate R
Page 77 and 78: Quiz: Annular Plate t min Annular p
Page 79 and 80: API653: Table 4.5—Annular Bottom
Page 81 and 82: API653: Table 4.4—Bottom Plate Mi
Page 83 and 84: 4.5.2 and 4.5.3 General a. For repa
Page 85 and 86: 5.2.1 Reported conditions involving
Page 87 and 88: 5.3 Assessment Procedure 5.3.1 - 5.
Page 89 and 90: 6.2.2 The interval between inspecti
Page 91 and 92: 6.3.3 In-service UT "t" measurement
Page 93 and 94: API651: 11.3 Cathodic Protection Su
Page 95 and 96: CP Survey 11.3 Cathodic Protection
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6.4.2 Inspection Intervals 6.4.2.1
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6.4.2.1.2 As an alternative to esta
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6.4.2.2 Subsequent Internal Inspect
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Table 4.4—Bottom Plate Minimum Th
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Quiz: Critical Zone t min t minimum
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Quiz: Bottom Plate excluding Critic
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6.8.2 Construction Records May incl
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6.9 Reports 6.9.1 Recommended repai
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113 Inspection Frequency Considerat
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115 Internal inspection is required
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API 653 Initial Inspection Interval
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119 API 653 Initial Inspection Inte
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Page 123 and 124:
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125 API 653 Subsequent Inspection I
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129 Steps for corrosion rate calcul
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131 Finally ‐ Calculate Subsequen
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API 653 Subsequent Inspection Inter
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139 Factors to Consider in a RBI As
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141 RBI Inspection • RBI Assessme
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143 Comparison Direct Measurements
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145 Questions ?
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7.3.1.2 If plates are not identifie
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8.5 Shell Penetrations 8.5.1 New/re
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9.2 Removal and Replacement - Shell
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9.2.3 Weld Joint Design 9.2.3.1 Rep
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9.3.1.7 Maximum size of lap patch p
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9.3.3 Lapped patch plates may be us
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9.7 Repair of Shell Penetrations 9.
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9.10 Repair of Tank Bottoms (Defini
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9.10.2.2 New bearing plates are req
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9.10.3.1 Additional Welded-on Plate
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9.13 Repair/Replacement of Floating
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9.14.5 Installation Procedure 9.14.
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Hot Tapping Charlie Chong/ Fion Zha
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10.3.2 Bottoms 10.3.2.1 Deseam lapw
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10.3.5 Piece Marking 10.3.5.1 Shell
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10.4.2.3 Specific welding notes: a.
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10.4.3 Bottoms 10.4.3.2 Weld shell
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SECTION 11 - WELDING 11.1 Welding Q
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12.1.2 Shell Penetrations 12.1.2.1
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12.1.6 Shell-to Bottom 12.1.6.1 Joi
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12.2.1.4 Each butt-weld annular pla
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12.3.2.2 Shell Repair 12.3.2.2.1 We
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12.5 Measured Settlement (During Hy
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SECTION 13 - MARKING AND RECORD KEE
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13.3 Certification Documentation of
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ANS: ANS: Charlie Chong/ Fion Zhang
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B.2.2.3 Differential Settlement (ou
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B.2.3 Edge settlement B.2.3.1 Occur
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APPENDIX C CHECKLISTS FOR TANK INSP
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APPENDIX E TECHNICAL INQUIRIES This
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G.2.6 qualification test: The demon
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G.3 An explanation of Tank Bottom E
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API 653 CODE QUIZ Charlie Chong/ Fi
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Q3. A condition that exists when it
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Q7. What primary factor determines
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Q11. What type of contour cut (if a
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Q15. API-653 (Section 12) requires
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Q16. Calculate the minimum thicknes
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Q19. A bulge is found on the tank f
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Q16. d (1/2") [Paragraph 4.3.3 page
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Section 2 650 Summary 2007 Charlie
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Charlie Chong/ Fion Zhang
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Good Luck! Charlie Chong/ Fion Zhan
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Understanding API ICP653 Reading 7-Worksheet-04 Part1

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