Best Practice for Risk Based Inspection

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In addition, for the TOFD technique, there are two available standards. One is a British Standard, BS 7706: 1993 – Guide to calibration and setting-up of the ultrasonic time of flight diffraction (TOFD) technique for the detection, location and sizing of flaws. The other is a European Pre-standard, ENV 583-6: 2000 – Nondestructive testing-ultrasonic examination - Part 6: Time-of-flight diffraction technique as a method for detection and sizing of discontinuities. 77
Table 1 Generally accepted methods for the detection of accessible surface flaws NDT method Material VT PT MT ET Ferritic Steel * Austenitic Steel * Table 2 Generally accepted methods for the detection of internal flaws in full penetration welds Parent material thickness/t (mm) Material and type of weld t ≤ 8 8 < t ≤ 40 t > 40 Ferritic butt-weld RT or (UT) UT or RT UT or (RT) Ferritic T-weld (UT) or (RT) UT or (RT) UT or (RT) Austenitic butt-weld RT RT or (UT) RT or (UT) Austenitic T-weld (UT) or (RT) (UT) or (RT) (UT) or (RT) * or ( ) indicates that the method is applicable with some limitations 78
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HSE Health & Safety Executive Best
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© Crown copyright 2001 Application
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5.3. PUBLISHED DATA, EXPERIENCE AND
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Any feedback or comments on the con
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Duty Holders inspect plant to manag
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inspection planning processes are b
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when a root cause has led to deteri
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plant database containing an invent
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Fig. 1.1 Process diagram for plant
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using suitable techniques, includin
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With this information the manufactu
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isk assessment carried out under Re
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CEOC recognises that it would seem
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• The second details how to estim
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a) Amount of equipment within item.
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2.9 SAFed - Guidelines on Periodici
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3.2. CRITERIA FOR APPLICATION Good
Page 35 and 36: 3.3. DRIVERS TOWARDS RBI The reason
Page 37 and 38: 4. THE RBI TEAM 4.1. COMPOSITION AN
Page 39 and 40: assessment and inspection may affec
Page 41 and 42: 5. PLANT DATA REQUIREMENTS 5.1. ESS
Page 43 and 44: If the need for repair or modificat
Page 45 and 46: 5.2. FAILURE CONSEQUENCES ASSESSMEN
Page 47 and 48: • Accident Databases. Many user o
Page 49 and 50: detected by periodic examination. D
Page 51 and 52: • Use of check-lists and mechanis
Page 53 and 54: Step 1. Determine and score (on a s
Page 55 and 56: The main problem with this approach
Page 57 and 58: Methods used to assess the release
Page 59 and 60: 6.8. SUMMARY OF MAIN POINTS a) Risk
Page 61 and 62: within a written scheme. It may be
Page 63 and 64: For equipment purchased second hand
Page 65 and 66: (b) Industry guidelines The Institu
Page 67 and 68: Conversely, it would be prudent to
Page 69 and 70: HSE commissioned research (7.9) to
Page 71 and 72: They provide a basic proof of leak
Page 73 and 74: uncertainty will exist. For equipme
Page 75 and 76: 8. ACHIEVEMENT OF RELIABLE INSPECTI
Page 77 and 78: Relevant Personnel Certification:
Page 79 and 80: Relevant Standards: BS EN 1711: 200
Page 81 and 82: measurements will more than likely
Page 83 and 84: Probability of detection (POD) resu
Page 85: • D-scan presentation: the displa
Page 91: Table 4 NDT method versus damage ty
Page 95 and 96: 8.2. REMOTE SCREENING TECHNIQUES Re
Page 97 and 98: The technique is particularly appli
Page 99 and 100: AE can be a very sensitive test met
Page 101 and 102: Because of the interdependence of t
Page 103 and 104: 8.3.3. Discussion of POD and Flaw M
Page 105 and 106: a) A Technical Justification, and b
Page 107 and 108: ecommended. In particularly difficu
Page 109 and 110: 8.7 HSE Project: ‘Programme for t
Page 111 and 112: Fig. 8.2 Example of Receiver Operat
Page 113 and 114: 9. FEEDBACK FROM RISK BASED INSPECT
Page 115 and 116: 9.2. RISK OF REPAIRS AND MODIFICATI
Page 117 and 118: It is considered best practice if t
Page 119 and 120: 9.6. A DYNAMIC PROCESS - THE NEED F
Page 121 and 122: 10. EVIDENCE OF EFFECTIVE MANAGEMEN
Page 123 and 124: Evidence of good co-operation can u
Page 125 and 126: • Fitness-for-service assessments
Page 127 and 128: 10.12. SUMMARY OF MAIN POINTS (a) D
Page 130 and 131: A1. INTRODUCTION This Authoritative
Page 132 and 133: fed via pressure system 0019 - S -
Page 134 and 135: Probability of Failure Internal Cor
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(a) Vessels B1, B2 and B3 : Jackete
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(b) Vessel B4: Catalyst Column Prob
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Examination Periodicity: The freque
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(d) Vessel B6 : Catchpot Probabilit
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APPENDIX B AUDIT TOOL FOR RISK BASE
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1. Assess the requirements for inte
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B1.5. HOW DO INTEGRITY MANAGEMENT A
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B3. SPECIFYING THE RBI MANAGEMENT T
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B4. ASSEMBLY OF THE PLANT DATABASE
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B5.5. HOW HAS THE LIKELIHOOD OF FAI
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B6.5. WHAT METHODS AND FACTORS ARE
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B7.6. IS EVIDENCE OF NDT CAPABILITY
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B9. FEEDBACK FROM INSPECTION B9.1.
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APPENDIX C TECHNIQUES FOR IDENTIFYI
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Fault tree analysis is a very usefu
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TYPES OF DETERIORATION AND MODES OF
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Fig.D3 Creep fissure in pipework wa
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Fig.D6 Stress corrosion cracking in
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maximum permissible pressure must b
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APPENDIX E SOFTWARE PACKAGES SUPPOR
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These modification factors reflect
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APPENDIX F GLOSSARY OF TERMS
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Duty Holder Within this report, the
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Qualitative Risk Analysis Qualitati
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Best Practice for Risk Based Inspection

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