Your Reliability Engineering Professional Development Site
Find all articles across all article series listed in reverse chronological order.
This story is an example of centering your design around a high-tech solution to a problem when a low risk proven technology would have more than sufficed. Technical expertise egos got in the way of a practical low-cost approach resulting in unplanned schedule and cost growth.
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Someone asked, “…if you can give me quick explanation: For Example, EPRD 2014 part, Category: IC, Subcategory: Digital, Subtype1: JK, Failure Rate (FPMH) = 0.083632 per (million) calendar hours! How do you convert that to operational hours?” I.e., time-to-failure T has exponential distribution in calendar (million) hours with MTBF 11.9571 (million) hours.
Did the questioner mean how to convert calendar-hour MTBF into operating-hour MTBF? David Nichols’ article does that for 217Plus MTBF predictions, based on “the percentage of calendar time that the component is in the operating or non-operating (dormant) calendar period, and how many times the component is cycled during that period.” I.e., MTBF/R where R is the proportion of operating hours per calendar hour.
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| Oxygen Concentration (% Volume) | Symptoms of acute exposure |
|---|---|
| 15-19 | May impair coordination. Decreased ability to perform tasks |
| 12-15 | Impaired coordination, perception, and judgment |
| 10-12 | Increased breathing rate, poor coordination and judgment, lips slightly blue |
| 8-10 | Mental failure, fainting, unconsciousness, ashen face, blueness of lips, nausea, upset stomach and vomiting |
| 6-8 | 8 minute exposure: may be fatal in 50-100%; 6 minute exposure: may be fatal in 25-50%; 4-5 minutes exposure: Recovery with treatment |
| 4-6 | Coma in 40-seconds, followed by convulsions, breathing failure, death |
Source: Compressed Natural Gas Safety Bulletin, SB-2, 1992.
I recently sat down with Ray Moore and chatted about my new book, Facilitating with FINESSE: How to Lead Others to Successful Business Solutions. The book is scheduled for release on May 31, 2023.
Ray: What is your new book about?
JD: It is a practitioner’s guide for 10 common applications that technically trained professionals are frequently asked to facilitate. The range of applications covers quality and reliability techniques such as block diagrams and tree diagrams through master plans and strategic plans.
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This is the sixth edition of the R for Engineering newsletter, and today we look at the ultimate prioritization tool – Pareto charts!
Pareto charts are a core tool for anyone who makes decisions, whether it is selecting a project or problem to solve, combing through last year’s spend or deciding on what equipment to purchase this year. The list goes on; bottom line is that Pareto charts simply allow you to focus on what’s important and cut through what may be interesting but unimportant.
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Guest Post by Howard M. Wiener (first posted on CERM ® RISK INSIGHTS – reposted here with permission)
I am pretty close to completing my first book – Agile Enterprise Risk Management, Risk-Based Thinking, Multi-Disciplinary Management and Digital Transformation. It is now at the publishers, awaiting finalization. I have established a site for the book and this is the home page text that describes what AERM is all about.
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Read about the Requirements for the Content of the ISO 9001 Quality Manual Lead Document from which the rest of an ISO 9001 Quality System Cascades
An ISO 9001 Quality Management System requires a ISO 9001 Quality Manual that contains all the details of how your business is run to produce your products or services to a quality standard.
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CBM or Condition-Based Maintenance is a maintenance approach that includes these five facts:
A good mental framework to have is that instead of you pushing towards accomplishing goals, you think about what things you have to “pull” to get to the end game. The subtle shift in the thinking will position you to find more creative solutions to problems. A very frequent problem with management who doesn’t really know how to solve problems is saying things like “work harder”. If we just turn up the Hard Work Dial to 11, then the problems will go away, obviously. Instead if we looked at what is stopping the success and actively worked on removing those problems, we’d be able to remove the stress of failure without having to break the Hard Work Dial.
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In 1653, “An Act for Constituting Commissioners for Ordering And Managing the Affairs of the Admiralty And Navy” established the responsibilities of the Admiralty and Commissioners of the Navy. The Commissioners were to make policy for building, fitting out, “repairing and preserving,” and “sale and disposal of old and unserviceable ships and vessels.” Another duty was to conduct a survey (i.e. an inventory) of the nation’s ships and naval stores, an element carried over from Monson’s Tracts in 1624.
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We all know that air is mostly nitrogen…79% to be precise. What may not be a common knoweldge is that colorless odorless Nitrogen has led to asphyxiation and fatalities and is a risk particularly for personnel working in confined spaces and personnel utilizing breathing air systems.
According to the Chemical Safety Board (CSB) research there were 80 nitrogen asphyxiation fatalities between 1992-2002. This translates to one nitrogen asphyxiation death every seven weeks. Approximately, 10% of fatalities were due to attempts to rescue person in confined spaces.
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This video provides a summary of the Prelical Solution’s Practical Reliability process. For more information, contact us at info@prelical.com or visit our website at prelical.com.
This video will provide a practical framework for implementing a reliability process at your company. Tips on how to develop an effective asset strategy, execution of that strategy and how to evaluate the results of the strategy in the field.
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Qualitative assessments are used in various applications, including asset management, risk management, human reliability analysis, and customer surveys. The usefulness of any qualitative assessment is a function of design, analysis, and administration. Facilitation plays a pivotal role.
Facilitators should understand the strengths and weaknesses of the qualitative assessments we facilitate and design. Qualitative assessments measure the opinions, attitudes, knowledge, perceived behaviors, observations, beliefs, and experiences of individuals who use a system the most. The correct understanding is fundamental as we lead participants to solutions that are created, understood, and accepted by all. [Read more…]
Teams, they are everywhere; sports teams, project teams, political parties, rock bands, military units, the list goes on. The team isn’t just about the people in the limelight it’s also about the backroom boys and girls who provide logistical, technical, administrative, and sometime moral support to the front men and women. Even the lone competitor or the one-man-band needs some support; everybody needs somebody sometime.
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Questions and queries asked following a screw feeder shaft breakage on a 15m long fertiliser dust transfer feed conveyor
If you have rotating shafts breaking at the drive-end of the auger shaft you may have a combination of bending and torsional fatigue. You are welcome to read the series of emails and responses below to a screw conveyor auger drive end failure.
