Sofronas, A.
Tony Sofronas, D. Eng, was the worldwide lead mechanical engineer for ExxonMobil Chemicals before retiring. He now owns Engineered Products, which provides consulting and engineering seminars on machinery and pressure vessels. Dr. Sofronas has authored two engineering books and numerous technical articles on analytical methods.
HP Engineering Case Histories: Case 75: Analyzing wear when troubleshooting
Wear occurs frequently on machinery. In its simplest terms, it is the undesirable removal of material. When troubleshooting the root cause of wear in equipment, the engineer’s interest should be ..
HP Engineering Case Histories: Case 74: How to determine impact forces when troubleshooting
When troubleshooting failures, it is not unusual for the metallurgical report to indicate that the failure was the result of an impact type of force. The investigator who receives this information mus..
HP Engineering Case Histories: Case 73: Useful troubleshooting tools to keep at hand
Over the past 45 years, the author has pursued troubleshooting machinery and pressure vessels. It has also been the subject of this column. The troubleshooting tools used in this endeavor have been an..
HP Engineering Case Histories: Case 72: Interaction between disciplines when troubleshooting
When troubleshooting, we can become fixated on the discipline that we are most familiar—in the author’s case, mechanical engineering. Investigating the failure of a machine may have a group ..
HP Engineering Case Histories: Case 71: Statistical visual data can be useful in troubleshooting—Part 2
In “Case 71: Statistical visual data can be useful in troubleshooting—Part 1,” the editorial focused on how taking data and analyzing it could determine the cause for high reject rates...
HP Engineering Case Histories: Case 71: Statistical visual data can be useful in troubleshooting—Part 1
I’ve spent many years troubleshooting equipment, along with investigative research. In research-statistical design, data analysis is frequently used when test information is available. This artic..
HP Engineering Case Histories: Case 70: Twenty rules for troubleshooting
In previous Engineering Case History columns, I have discussed checklists and their value in avoiding errors during startups. While the rules cannot replace common sense or a logical and methodical ap..
HP Engineering Case Histories: Case 69: Heat-up rate and rubs on a steam turbine
This column has suggested using simple analytical models to troubleshoot equipment. However, in some cases, a more detailed solution may be required. The following case histories examine the heat up o..
Case 68: Pneumatic testing dangers
Use caution on what defines a true ‘safe distance’
Case 67: Extruder blowback
Understanding what is happening can lead to a solution
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