Your Reliability Engineering Professional Development Site
Fibreglass construction and repair. Fibreglass is a glass fibre reinforced plastic composite with excellent chemical resistance properties. Its physical properties, selection of resins and glass, method of construction and fabrication and peculiar repair requirements must be appreciated when using this material.
Keywords: laminate, backing layer, structural layer, corrosion barrier, crack repair, winding angle. [Read more…]
Black’s equation for estimating the time to failure due to electromigration is a classic. James Black explored and wrote about electromigration in aluminum metallization within semiconductors since 1969.
He and others have explored other materials used as conductors prone to electromigration. Thus, there are a number of models and constants available to match your particular system.
Let’s take a look at the general equation for a microcircuit conductor after a brief description of the failure mechanisms called electromigration. [Read more…]
Something light to read on a Monday afternoon.
I’m beginning think that one of the worst side effects of growing older has nothing to do with the fact that you are not as active as you should be, but that you spend that time where you should have been walking, running, riding a bike or chasing the kids thinking about crap that might have little significance to the rest of the world. [Read more…]
Making the criticality analysis work for you and drive improvements in the maintenance strategy
Most manufacturers do not have an up to date criticality analysis and those that do have one, do not use it to drive decisions. Having a criticality analysis facilitates improved decision making and prioritization within the site and business.
How many times are there debates regarding which work needs to be done, which PMs will be dropped from the schedule because the planned downtime was reduced? These debates occur regularly, but to not have to occur. A criticality analysis drives improvements in the business by: [Read more…]
Your upfront capital investment must go beyond engineering, procurement and building costs. Additional activities that will need to be done that fit within the 2 – 3 % of capital cost figure are:
RCM analysis on the new design (preferably at both concept and detailed design phases so you can incorporate design change recommendations easily) [Read more…]
Design of Experiments (DOE) is a phenomenal way to identify key relationships between variables and effects. It fully leverages statistics to not only identify these relationships in a compressed time frame but any “interactions” between variables that cause a specific effect. These interactions would not have been observed if experimentation was limited to adjusted one factor at a time (OFAT).
Guest Post by Paul Kostek (first posted on CERM ® RISK INSIGHTS – reposted here with permission)
Hack a pacemaker? Is this a real problem?
Some recent experiments have been able to hack a pacemaker and other medical devices including an insulin pump. The weakness of these systems was the analog sensors attached to the body to gather information. These analog inputs bypass the internal security and are converted directly to digital signals.
From a risk perspective is this something medical device manufacturers , insurance companies and the medical professionals need to worry about? It was part of a conversation at the Black Hat @Design West Conference where considerable discussion was held on building defensive walls. [Read more…]
What readers will learn in this article.
Metal is a wonderful, strong, material. Yet under certain types of stresses metal can fail One in particular is fatigue due to cyclic motion.
Metals in a solid state have an atomic level lattice structure. This provides the strength and flexibility. It is the flexibility part that causes trouble. We don’t get the benefit of flexibility for free. As the metal bends it ‘adjusts’ the lattice to accommodate the motion. In doing so, it changes the metal properties becoming a bit more brittle, for example.
In most cases a very small motion causes imperceptible changes and loss of functionality. In some cases, like bending a wire coat hanger with the intent to break it, just a few cycles of dramatic bending is enough to break the wire.
In metal applications that experience cyclic motion and the risk of metal fatigue failure may occur during the expected duration of product use, we may need to characterize the time to failure behavior. An accelerated life test for a metal fatigue failure mechanism is not difficult, yet does take some planning to get meaningful results. [Read more…]
Several weeks ago a customer I worked with back in 2005 called me to ask some questions about a specific Root Cause Analysis process they were using as well as the facilitator they were working with. While I was familiar with the RCA process they were using I admitted to them I had never attended the formal training program offered by the company and while I did know the facilitator I had never seen him facilitate a formal RCA.
My customer then asks me a more difficult question; “Would you recommend we use this methodology as our select supplier for Root Cause Analysis training?” [Read more…]
Engineers have been applying Prognostics to mechanical components for many years.
For example:
However, most industries building systems with mechanical components choose not to use prognostics because of the cost of the instrumentation within the product. Products that have on board “smarts” can choose to include diagnostics with less effort or expense. With advances in technology, the cost of the instrumentation is dropping. This not only means that adding the hardware to support advanced metrology is more feasible but that many of these components/systems may have already been added for other functionality and controls improvements in the product. It doesn’t take much brainstorming to find creative ways to use these existing sensory systems. [Read more…]
Understanding the risks allow effective mitigation plans to be put in place
Where is your biggest risk to the site? If you can’t answer that, than your maintenance program is most likely not adequate. As previously discussed, an effective maintenance program must align with business and its needs. A criticality analysis allows the site to understand where there are risks that must be managed. [Read more…]
RCM has two potential uses – to set you up for success or to regain success from the jaws of failure.
Regardless of when you use it though, RCM alone isn’t enough to get all the benefits. Applying it after the systems are in service, to recover shortfalls in performance, and then failing to follow up on RCM’s results only delivers part of the benefit. That’s where the aircraft and nuclear industries and the military have it right – they take those extra needed steps. The rest of us don’t! [Read more…]
Guest Post by Paul Kostek (first posted on CERM ® RISK INSIGHTS – reposted here with permission)
After writing several articles about topics related to medical devices and big data, thought I’d explore a new area, risk and space tourism.
Though I will include one interesting note about medical devices, on the October 20th episode of 60 Minutes former VP Dick Cheney admitted that he had the external programming capability for his defibrillator turned off to prevent it from being hacked. So, even as people question the possibility of this occurring we have a real world example of the steps taken to prevent this from happening. Think risk mitigation. [Read more…]
Preventative maintenance stops breakdowns. Preventative Maintenance requires people to regularly walk around looking, feeling, listening, smelling (sometimes even tasting) and thinking about their equipment’s operating condition. The three foundations of classical Preventative Maintenance are regular lubrication checks, drive train monitoring and equipment mounting inspections.
Keywords: work order, inspection, watchkeeping, CMMS, computerised maintenance management system. [Read more…]
