Root Cause Failure Analysis. Trinath Sahoo
failure analysis procedure, including some approaches suitable for different types of problems. We also look at how plant‐wide failure prevention efforts should be conducted, including a discussion about the importance of the role of the top management in the prevention of failure.
2 In the second part, different types of failure mechanisms that affect process equipment are discussed with several examples of bearings, seals, and other components’ failures.
Because it is simply impossible to deal with every conceivable type of failure, this book is structured to teach failure identification and analysis methods that can be applied to virtually all problem situations that might arise.
Trinath Sahoo
About the Author
Trinath Sahoo, Ph.D., is the chief general manager at M/S Indian Oil Corporation Ltd. Dr. Sahoo has 30 years of experience in various fields such as engineering design, project management, asset management, maintenance management, lubrication, and reliability. He has published many papers in journals like Hydrocarbon Processing, Chemical Engineering, Chemical Engineering Progress, and World Pumps. Some of his articles were adjudged best articles and published as the cover page story in the magazines. He has also spoken in many international conferences. He was the convener for reliability enhancement projects for different refinery and petrochemical sites of M/S Indian Oil Corporation Ltd. Dr. Sahoo is the author of bestselling book Process Plants: Shutdown and Turnaround Management. He holds a Ph.D. degree from Indian Institute of Technology (ISM), Dhanbad, Jharkhand, India.
Acknowledgment
First and foremost, I would like to thank God, the Almighty, for His showers of blessings throughout to complete the book successfully. In the process of putting this book together, I realized how true this gift of writing is for me. You have given me the power to believe in my passion and pursue my dreams. I could never have done this without the faith I have in you, the Almighty.
I have to thank my parents for their love and support throughout my life. Thank you both for giving me strength to reach for the stars and chase my dreams.
For my wife Chinoo, all the good that comes from this book I look forward to sharing with you! Thanks for not just believing, but knowing that I could do this! I Love You Always and Forever!
To my children Sonu and Soha: You may outgrow my lap, but you will never outgrow my heart. Your growth provides a constant source of joy and pride to me and helped me to complete the book.
Without the experiences and support from my peers and team at Indian Oil, this book would not exist. You have given me the opportunity to lead a great group of individuals.
“Thanks to everyone on my publishing team.”
Only those who dare to fail greatly can ever achieve greatly.
Robert F. Kennedy.
1 FAILURE: How to Understand It, Learn from It and Recover from It
Failure and fault are virtually inseparable in households, organizations, and cultures. But the wisdom of learning from failure is much more than from success. Many a time we discover what works well, by finding out what will not work; and “probably he who have never made a mistake never made a discovery.”
Thomas Edison’s associate, Walter S. Mallory, while discussing inventions, once said to him, “Isn’t it a shame that with the tremendous amount of work you have done you haven’t been able to get any results?” Edison replied, with a smile, “Results! Why, my dear, I have gotten a lot of results! I know several thousand things that won’t work.”
People see success as positive and failure as negative phenomena. Edison’s quote emphasizes that failure isn’t a bad thing. You can learn and evolve from your past mistakes. But in organizations executives believe that failure is bad. These widely held beliefs are misguided. Understanding of failure’s causes and contexts will help to avoid the blame game and create an atmosphere of learning in the organization. Failure may sometimes considered bad, sometimes inevitable, and sometimes even good in organizations. In most companies, the system and procedures required to effectively detect and analyze failures are in short supply. Even the context‐specific learning strategies are not appreciated many times. In many organizations, managers often want to learn from failures to improve future performance. In the process, they and their teams used to devote many hours in after‐action reviews, post‐mortems, etc. But time after time these painstaking efforts led to no real change. The reason: being, managers think about failure in a wrong way.
To be able to learn from our failures, we need to develop a methodology to decode the “teachable moments” hidden within them. We need to find out what exactly those lessons are and how they can improve our chances of future success.
Failure Type
Although an infinite number of things can go wrong in machinery, systems, and process, mistakes fall into three broad categories: preventable failure, failure in complex system, and intelligent failure.
Preventable Failures
Most failures in this category are considered as “bad.” These could have been foreseen but weren’t. This is the worst kind of failure, and it usually occurs because an employee didn’t follow best practices, didn’t have the right talent, or didn’t pay attention to detail. They usually deviate from specification in the closely defined processes or deviate from routine operations and maintenance practices. But in such cases, the causes can be readily identified and solutions can be developed.
If you’ve experienced a preventable failure, it’s time to more deeply analyze the effort’s weaknesses and stick to what works in future. Employees can follow those new processes learned from past mistakes consistently, with proper training and support.
Human error used to be an area that was associated with high‐risk industries like aviation, rail, petrochemical and the nuclear industry. The high consequences of failure in these industries meant that there was a real obligation on companies to try to reduce the likelihood of all failure causes. Human error is also a high‐priority, preventable issue.
Unavoidable Failures in Complex Systems
In complex organizations such as aircraft carriers, nuclear power plants, and petrochemical plants, system failure is a perpetual risk. A large number of failures are due to the inherent uncertainty of working of such systems.
The lesson from this type of failure is to create systems to try to spot small failures resulting from complex factors, and take corrective action before it snowballs and destroys the whole system. These type of failure may not be considered bad but reviewed how complex systems work. Most accidents in these systems result from a series of small failures that went unnoticed and unfortunately lined up in just the wrong way.
The complex systems are heavily and successfully defended against failure by construction of multiple layers of defense against failure. These defenses include obvious technical components (e.g. backup systems, “safety” features of equipment) and human components (e.g. training, knowledge) but also a variety of organizational, institutional, and regulatory defenses (e.g. policies and procedures, certification, work rules, team training). The effect of these measures is to provide