Page 20 - Marine Structural Design

Contents xvii
27.2. I Stress Modeling ................................................................................................................ 481
27.2.2 Stress Modeling Error ...................................................................................................... 482
27.3 Fatigue Reliability Models ...................................................................................................... 483
27.3.1 Introduction ...................................................................................................................... 483
27.3.2 Fatigue Reliability - S-N Approach ................................................................................. 484
27.3.3 Fatigue Reliability - Fracture Mechanics (FM) Approach ............................................... 484
27.3.4 Simplified Fatigue Reliability Model - Lognormal Format ............................................. 487
27.4 Calibration of FM Model by S-N Approach ............................................................................ 488
27.5 Fatigue Reliability Application . Fatigue Safety Check .......................................................... 489
27.5.1 Target Safety Index for Fatigue ....................................................................................... 489
27.5.2 Partial Safety Factors ....................................................................................................... 489
27.6 Numerical Examples ................................................................................................................ 490
27.6.1 Example 27.1 : Fatigue Reliability Based on Simple S-N Approach ................................ 490
27.6.2 Example 27.2: Fatigue Reliability of Large Aluminum Catamaran ................................. 491
27.7 References ............................................................................................................................... 496
CHAPTER 28 PROBABILITY AND RISK BASED INSPECTION PLANNING ...................... 497

28.1 Introduction ............................................................................................................................. 497
28.2 Concepts for Risk Based Inspection Planning ......................................................................... 497
28.3 Reliability Updating Theory for Probability-Based Inspection Planning ................................ 500
28.3.1 General ............................................................................................................................. 500
28.3.2 Inspection Planning for Fatigue Damage ......................................................................... 500
28.4 Risk Based Inspection Examples ............................................................................................. 502
28.5 Risk Based 'Optimum' Inspection ........................................................................................... 506
28.6 References ............................................................................................................................... 512

Part V: Risk Assessment

CHAPTER 29 RISK ASSESSMENT METHODOLOGY ............................................................. 515
29.1 Introduction ............................................................................................................................. 515
29.1.1 Health, Safety and Environment Protection ..................................................................... 515
29.1.2 Overview of Risk Assessment .......................................................................................... 515
29.1.3 Planning of Risk Analysis ................................................................................................ 516
29.1.4 System Description .......................................................................................................... 517
29.1.5 Hazard Identification ........................................................................................................ 517
29.1.6 Analysis of Causes and Frequency of Initiating Events ................................................... 518
29.1.7 Consequence and Escalation Analysis ............................................................................. 518
29.1.8 Risk Estimation ................................................................................................................ 519
29.1.9 Risk Reducing Measures .................................................................................................. 519
29.1.10 Emergency Preparedness ............................................................................................ 520
29.1.1 1 Time-Variant Risk ...................................................................................................... 520
29.2 Risk Estimation ........................................................................................................................ 520
29.2.1 Risk to Personnel .............................................................................................................. 520
29.2.2 Risk to Environment ........................................................................................................ 522
29.2.3 Risk to Assets (Material Damage and Production LossDelay) ....................................... 522
29.3 Risk Acceptance Criteria ......................................................................................................... 522
29.3.1 General ............................................................................................................................. 522
29.3.2 Risk Matrices ................................................................................................................... 523
29.3.3 ALARP-Principle ............................................................................................................. 524
29.3.4 Comparison Criteria ......................................................................................................... 525
29.4 Using Risk Assessment to Determine Performance Standard ................................................. 525
29.4.1 General ............................................................................................................................. 525