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A practical and accessible approach to machinery troubleshooting Unique Methods for Analyzing Failures and Catastrophic Events is designed to assist practicing engineers address design and fabrication problems in manufacturing equipment to support safe process operation. Throughout the book, a wealth of real-world case studies and easy-to-understand illustrated examples demonstrate how to use simplified failure analysis methods to produce insights for a wide range of engineering problems. Dr. Anthony Sofronas draws from his five decades of industry experience to help engineers better understand the science behind a particular problem, evaluate the failure analysis of an outside consultant, and recommend the best path forward to management. The author distills sophisticated engineering analysis approaches into compact, user-friendly methodologies that can be easily applied to the readers' own situations to avoid costly failures. Each chapter includes a thorough summary of the topic, relatable technical examples, and a concluding section with key takeaways and expert tips and advice. This invaluable guide: Helps readers make better decisions while solving complex engineering problems Provides numerous illustrated examples from engineering and science that can be used to develop real-world solutions Features detailed descriptions of both basic and advanced engineering analysis techniques Covers essential technical subjects that facilitate safe facility design and effective troubleshooting Unique Methods for Analyzing Failures and Catastrophic Events: An Illustrated Guide for Engineers is a must-have for chemical, petroleum, and mechanical engineers, reliability managers and technicians, design contractors, and maintenance workers working in process industries.

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A practical and accessible approach to machinery troubleshooting Unique Methods for Analyzing Failures and Catastrophic Events is designed to assist practicing engineers address design and fabrication problems in manufacturing equipment to support safe process operation. Throughout the book, a wealth of real-world case studies and easy-to-understand illustrated examples demonstrate how to use simplified failure analysis methods to produce insights for a wide range of engineering problems. Dr. Anthony Sofronas draws from his five decades of industry experience to help engineers better understand the science behind a particular problem, evaluate the failure analysis of an outside consultant, and recommend the best path forward to management. The author distills sophisticated engineering analysis approaches into compact, user-friendly methodologies that can be easily applied to the readers' own situations to avoid costly failures. Each chapter includes a thorough summary of the topic, relatable technical examples, and a concluding section with key takeaways and expert tips and advice. This invaluable guide: Helps readers make better decisions while solving complex engineering problems Provides numerous illustrated examples from engineering and science that can be used to develop real-world solutions Features detailed descriptions of both basic and advanced engineering analysis techniques Covers essential technical subjects that facilitate safe facility design and effective troubleshooting Unique Methods for Analyzing Failures and Catastrophic Events: An Illustrated Guide for Engineers is a must-have for chemical, petroleum, and mechanical engineers, reliability managers and technicians, design contractors, and maintenance workers working in process industries.

Author Biography

A. Sofronas, DEng, PE, is the former Worldwide Lead Mechanical Engineer for ExxonMobil. He was involved with machinery troubleshooting for 50 years with more than 130 publications and numerous presentations at industry seminars worldwide. Dr. Sofronas is a contributing editor for Hydrocarbon Processing and the author of Analytical Troubleshooting of Process Machinery and Pressure Vessels, Case Histories in Vibration Analysis and Metal Fatigue, and Survival Techniques for the Practicing Engineer.

Table of Contents

About the Author xvii Preface xix Acknowledgments xxi 1 Engineering Suggestions Based on Experience 1 1.1 What Should We Learn from This Book? 1 1.1.1 Summary 3 Reference 3 1.2 We All Contribute to Each Other's Success 3 1.2.1 Summary 5 Reference 5 1.3 Why Performing Calculations is Important to an Engineer's Career 5 1.3.1 Summary 7 Reference 8 1.4 How an Engineering Consultant Can Help Your Company 8 1.4.1 Summary 10 1.5 The Benefit of Keeping Complex Problems Simple 10 1.5.1 Summary 14 1.6 Taking Risks and Making High-Level Presentations 15 1.6.1 Summary 16 1.7 Searching the Literature for Data 16 1.7.1 Equations 17 1.7.2 Facts 17 1.7.3 Credibility 17 1.7.4 Accuracy of the Data 17 1.7.5 Sources to Search 18 1.7.6 Summary 18 References 19 1.8 Cautions to New to Industry Technical Personnel 19 1.8.1 The Wrong Frequency 19 1.8.2 Using the Incorrect Measuring Technique 20 1.8.3 Never Under-Estimate the Value of Experienced People 20 1.8.4 Check and Double Check Your Design 20 1.8.5 Some Understand the Equipment Much Better Than You 21 1.8.6 Summary 22 1.9 A Method for Analyzing Catastrophic Type Failures 22 References 24 2 Evaluating Failures and Designs 25 2.1 Twenty Rules to Remember 25 2.1.1 Summary 28 2.2 How to Avoid Being Overwhelmed in a Failure Situation 29 2.2.1 Summary 31 2.3 Catastrophic Failures and the Human Factor 31 2.3.1 Summary 35 References 35 2.4 The Importance of Alliances and Networking 35 2.4.1 Summary 36 2.5 Personal Checklists are Important 37 2.6 Checklist for Vibration Analysis 37 2.6.1 Summary 39 Reference 40 2.7 Checklist for New Piping System Installations 40 2.8 Checklists for Pumps and Compressors 40 2.9 Understanding What the Failure Data Is Telling You 41 2.9.1 Gear Damage 41 2.9.2 Shaft Failures 42 2.9.3 Weld Failures 43 2.9.4 Bolt Failures 43 2.9.5 Brittle Fracture Failures 45 2.9.6 Anti-Friction Bearing Failures 46 2.9.7 Spring Failures 46 2.9.8 Drilled Holes 47 2.9.9 Summary 48 2.10 Phantom Failures and Their Dilemma 49 2.10.1 Summary 50 2.11 Various Types of Equipment and Their Failure Loads 50 2.11.1 Summary 52 3 Mechanical Failures 53 3.1 Preventing Crankshaft Failures in Large Reciprocating Engines 53 3.1.1 Summary 57 3.2 Structural Collapse of a Reinforced Concrete Bridge 57 3.2.1 Summary 61 Reference 61 3.3 Failure Analysis Computations Differ from Design 61 3.3.1 Summary 64 3.4 Crack Growth and the Bending Failures of a Hollow Shaft 64 3.4.1 An In-Service Failure Example 66 3.4.2 The Assumptions and Comparisons 67 3.4.3 Summary 68 Reference 68 3.5 Why Did a Small Piece of Foam Cause the Shuttle Columbia to Crash? 68 3.5.1 Summary 71 Reference 71 3.6 Can the Aircraft Cowling Contain a Broken Turbine Blade? 71 3.6.1 Summary 72 References 72 3.7 Why Did My Car Windshield Break from a Very Small Stone? 73 3.7.1 Summary 73 3.8 Momentum or Why a Car Is Harder to Push and Then Easier When Rolling 73 3.8.1 Summary 75 3.9 Bearing Failure Due To Design Error 75 3.9.1 Summary 76 3.10 What Is the Shortest Stopping Distance for My Car? 76 3.10.1 Summary 76 3.11 How Hot Do Brake Disks Get in a Panic Stop? 77 3.11.1 Summary 78 3.12 Will the Turbocharger Disk Go Through its Housing? 78 3.12.1 Summary 80 3.13 Failure of an Agitator Gearbox 80 3.13.1 Summary 82 3.14 Failure of an Extruder Screw 82 3.14.1 Summary 83 Reference 83 3.15 Failure of a Steam Turbine Blade 84 3.15.1 Summary 87 3.16 How Long Will It Last? 87 3.16.1 Summary 90 Reference 90 3.17 Gear Life With a Load 90 3.17.1 Summary 92 3.18 Analyzing the Life of a Gear 93 3.18.1 Summary 94 3.19 Predicting the Cause of a Gear Tooth Crack Growth Past and Future 94 References 96 3.20 Nonlinear and Linear Impact Problems 97 3.20.1 Summary 100 3.21 Phantom Failure of an Expander–Dryer 100 3.21.1 Summary 103 3.22 Cracking of a Rail Hopper Car Due to Couple-Up 103 Reference 106 3.23 Loss of Oil Supply and Gear Set Destruction 106 References 109 3.24 Analyzing the Total Collapse of a Multi-Story Building 110 References 115 4 Fluid Flow and Heat Transfer Examples 116 4.1 Addressing Heat Exchanger Tube Leaks 116 4.1.1 Summary 118 4.2 Explaining Flow Through Piping Using the Poiseuille Equation 119 4.2.1 Summary 120 4.3 A Local Flooding Event at a Plant Site 120 4.3.1 Summary 122 Reference 122 4.4 Examining Fan System Pulsations 122 4.4.1 Summary 125 References 126 4.5 The Dynamics of How an Aircraft Flies 126 4.5.1 Summary 129 4.6 How Much Wind Does It Take to Blow Over a Motor Coach? 129 4.6.1 Summary 131 4.7 How Much Wind Force to Buckle an Aircraft Hanger Door? 131 4.7.1 Summary 132 4.8 How Much Water on a Road to Float a Car? 132 4.8.1 Summary 133 4.9 How Fast Does an Object Hit the Ground? 133 4.9.1 Summary 135 4.10 Collapse of a Bubble and the Excitation Force on a Structure 135 4.10.1 Summary 139 4.11 Failure of a Cooling Tower Pump Due to Water Hammer 139 4.11.1 Summary 142 References 142 4.12 Braking Resistor Burn-Out on a Locomotive 142 4.12.1 Summary 144 4.13 Will a Small Ice Air Conditioner Work? 144 4.13.1 Summary 148 References 148 4.14 Prototype of Smallest Air Ice Cooler 148 4.14.1 Summary 149 5 Sports Examples 151 5.1 Why Does a Baseball Curve? 151 5.1.1 Summary 153 5.2 How Far Does a Baseball Go When Hit with Drag? 153 5.2.1 Summary 154 5.3 What Is the Force of a Batted Baseball? 154 5.3.1 Summary 155 5.4 Why Doesn't a Baseball Catcher's Arm Break with a 100-mph Fastball? 155 5.4.1 Some Data 156 5.4.2 Summary 157 5.5 Dynamics of a Billiard Ball 157 5.5.1 Summary 158 5.6 How Far Can a Golf Ball Go? 158 5.6.1 Summary 159 5.7 What Causes an Ice Skater to Spin so Fast? 159 5.7.1 Summary 160 5.8 Why Don't High Divers Get Injured? 160 5.8.1 Summary 162 References 162 5.9 How Hard Is a Boxers Punch? 163 5.9.1 Summary 164 6 Gas Explosion Events 165 6.1 Energy in Steam Boiler Explosions 165 6.1.1 Summary 167 References 167 6.2 Delayed Fireball-Type Explosions 167 6.2.1 Summary 171 References 171 6.3 Method for Investigating Hydrocarbon Explosions 171 6.3.1 Summary 178 References 178 6.4 Pipeline Explosion Critical Zone 179 6.4.1 Summary 179 6.5 Pneumatic Explosion Debris Range 180 6.5.1 Summary 181 6.6 How Are the Effect of Massive Energy Releases Compared? 182 6.6.1 Summary 183 6.7 Engine Air Intake Manifold Explosion 183 6.7.1 Summary 185 Reference 185 7 Vibration and Impact: The Cause of Failures 186 7.1 Investigating a Possible Cause for a Coupling Failure in a Centrifugal Compressor 186 7.1.1 Summary 192 References 192 7.2 Sudden Power Interruption to a System 193 7.2.1 Summary 195 7.3 Effect of Liquid Slug in a Centrifugal Compressor 195 7.3.1 Summary 198 Reference 198 7.4 Weld Failures in Vibrating Equipment 198 7.4.1 Summary 201 References 201 7.5 Effect of Gear Chatter on Pinion Teeth Impact 202 7.5.1 Summary 202 7.6 Holzer Method for Calculating Torsional Multi-mass Systems 203 7.6.1 Summary 204 7.7 What to do When the Vibration Levels Increase on Large Gearboxes 204 7.7.1 Summary 209 Reference 209 7.8 How Vibratory Torque Relates to Bearing Cap Vibration in a Gearbox 209 7.8.1 Summary 211 Reference 211 7.9 Vibration of a Polymer Extruder Gearbox 211 7.9.1 Summary 212 References 213 7.10 Processing and Wear Load Increase in a Polymer Extruder 213 7.10.1 Summary 214 Reference 214 7.11 Vibration Charts Can Give Faulty Information 214 7.11.1 Summary 215 7.12 Have Torsional Vibrations Caused the Gearbox Pinion to Fail? 216 7.12.1 Summary 218 8 Examining the Human Body 219 8.1 What Causes Football Brain Injuries? 219 8.1.1 Summary 223 References 223 8.2 Life Assessment Diagrams 223 8.2.1 Summary 224 8.3 Assessing the Cumulative Damage Done by Head Impacts 224 8.3.1 Summary 228 References 228 8.4 What Happens When I Hit My Head and See Stars? 229 8.4.1 Summary 230 8.5 How Does the Body Keep Cool? 230 8.5.1 Summary 232 8.6 How Do Our Muscles Work? 232 8.6.1 Summary 234 8.7 Why Do People Die from Heatstroke in a 75 FCar? 234 8.7.1 Summary 235 8.8 What Damage Can a Safety Airbag Do to a Human? 236 8.8.1 Summary 236 8.9 How Is Blood Pressure Measured? 236 8.9.1 Summary 237 8.10 How Does the Heart Work? 237 8.10.1 Summary 241 8.11 Restricting the Spread of a Virus 241 8.11.1 Summary 244 Reference 245 8.12 Why Do Some Survive a Freefall Out of an Aircraft? 246 8.12.1 Summary 246 9 Other Curious Catastrophic Failures Related to Earth 247 9.1 Can an Asteroid Be Deflected from Hitting Earth? 247 9.1.1 Summary 249 9.2 What Size Crater Does a Large Asteroid Make When It Hits Earth? 250 9.2.1 Summary 253 9.3 What Is an Earthquake? 253 9.3.1 Summary 255 9.4 Earthquakes Are so Strong Why Don't They Do More Damage? 256 9.4.1 Summary 258 9.5 Concerns on the Super-Volcano Under Yellowstone National Park 258 9.5.1 Summary 260 References 261 9.6 What Is a Tsunami and How Do They Form? 261 9.6.1 Summary 262 Reference 262 9.7 What Is a Tornado? 262 9.7.1 Summary 264 Reference 264 9.8 Can a Tornado Really Lift a House? 264 9.8.1 Summary 265 9.9 Can Straw Penetrate a Tree in a Tornado? 265 9.9.1 Summary 266 Reference 266 9.10 What Is a Hurricane? 266 9.10.1 Summary 267 10 Strange Occurrences and Other Interesting Items 268 10.1 What in the Force of a Ship Hitting a Whale? 268 10.1.1 Summary 269 Reference 270 10.2 How Much Wind to Blow Over a Tree 270 10.2.1 Summary 272 10.3 Why Do Objects Appear Smaller Than They Are? 273 10.3.1 Summary 274 10.4 Do We Feel a Force When Near Large Objects? 274 10.4.1 Summary 275 10.5 Why Does the Moon Sometimes Appear So Big on the Horizon? 275 10.5.1 Summary 276 10.6 How Does an Air Conditioner Operate? 276 10.6.1 Summary 277 Reference 277 10.7 How Fast to Heat Up a Room? 278 10.7.1 Summary 278 10.8 How Do I Size an Air Conditioner for a Garage? 278 10.8.1 Summary 279 10.9 At What Speed Does a Locomotive Become De-railed? 279 10.9.1 Summary 280 10.10 Are Those Huge Cruise Ships Stable? 280 10.10.1 Summary 281 10.11 Why Are Arches Used? 281 10.11.1 Summary 285 10.12 Why Don't Bighorn Sheep Die When Banging Their Heads? 285 10.12.1 Summary 286 10.13 Why Can't We Walk on Water? 286 10.13.1 Summary 288 Reference 288 10.14 How to Predict the Outcome of the Stock Market 288 10.14.1 Summary 292 10.15 Things Aren't as Random as They May Appear 293 Reference 294 10.15.1 Summary 295 10.16 Why Do Certain Events Seem to Happen Quite Often? 295 10.16.1 Summary 295 10.17 Occurrences on Machines and Structures 295 10.17.1 Summary 298 10.18 How Long Does It Take to Thaw a Frozen Turkey and to Cook It? 298 10.18.1 Summary 300 11 Magic Tricks Using Engineering Principles 301 11.1 Surface Tension and Floating Metal 301 11.1.1 Summary 304 11.2 Acceleration of Gravity and the Money Challenge 304 11.2.1 Summary 305 11.3 The Jumping Coin 305 11.3.1 Summary 306 11.4 The Belt Balancing Act 306 11.4.1 Summary 307 11.5 How Can It Be Held Up by Threads? 308 11.5.1 Summary 309 11.6 Pulling the Tablecloth 310 11.6.1 Summary 311 12 Useful Forms of the Equations Used in this Book 312 12.1 The Equations of Motion 312 12.2 Newton's First Law of Force 312 12.3 Newton's Second Law of Force 313 12.4 Newton's Third Law of Force 313 12.5 Newton's Gravitation Theory 313 12.6 Static Equilibrium 314 12.7 Momentum and Impulse 314 12.8 Kinetic Energy 314 12.9 Potential Energy 315 12.10 Conservation of Energy 315 12.11 Bernoulli's Equation 315 12.12 Specific Heat Equation 316 12.13 Conduction Equation 316 12.14 Convection Equation 316 12.15 Radiation Equation 317 12.16 Theories of Material Failure 317 12.17 Archimedes Principle 317 12.18 Centrifugal Force 318 12.19 What Is Enthalpy? 318 13 A Little About Some Famous Scientists Mentioned in This Book 319 13.1 Isaac Newton (1642–1726 AD) 319 13.2 Daniel Bernoulli (1700–1782 AD) 320 13.3 Archimedes of Syracuse (287–212 BC) 320 13.4 William Rankine (1820–1872 AD) 321 13.5 Leonardo da Vinci (1452–1519 AD) 321 13.6 Heinrich Holzer 321 13.7 Stephan Timoshenko (1878–1972) 322 Reference 322 13.8 Jacob P. Den Hartog (1901–1989) 322 References 322 13.9 Wilson, Ker, William 322 Index 325

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