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Showing content with the highest reputation on 04/13/2020 in all areas

  1. 1 point
    Hi @Derek Brown when you install a new piece of equipment a large number of failure modes will indeed be random and not age related. The percentage of random failures depends on the equipment and also the operating conditions for example many corrosion mechanisms are age related (but not all!) which is why for example the submarine data quoted from the SUBMEPP study in 2001 shows a lot more age-related failures (pattern C) versus the original United Airlines (UAL) Study from 1968 (see https://www.roadtoreliability.com/reliability-centered-maintenance-principles/) And it also depends on your maintenance practices - if you install bearings really well, lubricate them exceptionally well and operate them just perfectly you may indeed experience age related bearing failures. Most organisations don't manage to do that and they never get to age related failure modes on bearings instead they experience random failures because a defect is introduced by e.g. poor lubrication practices. What you'd want to do is to determine the dominant failure modes for that new piece of equipment, determine the consequence of failure and whether the impact warrants a maintenance action. Then look at the characteristics of the failure mode and whether it is likely to be random or age related. It it's clearly age (or cycle) related than a time based PM can be very cost effective, if it's likely to be random then indeed you want to look at a condition monitoring task. Bear in mind that a condition monitoring task needs to be practical, cost effective and that the value of knowing that a failure is likely to occur needs to be worth it. If the consequence is really limited a run-to-failure strategy can be perfectly acceptable. You don't need to go through a full RCM you could develop a relatively simple FMEA in a workshop with your engineers, maintenance technicians and machine operators. There is likely to be a wealth of knowledge there. And bear in mind that if you are really installing a like-for-like then you can use your historical failure data to determine your dominant failure modes (and then add to that list during the workshop). Hope that helps?
  2. 1 point
    Raul - like you I'm comparing numbers between countries. Earlier in the year I was in Australia with a client so I'm watching Australia and Canada, as well as the UK and USA. Australia and Canada had similar numbers for a while but Canada's have grown much faster. Our measures here were less strict and slower. The UK and USA - both very slow and very lax. The US doesn't even have a single health care system to speak of so they are really in rough shape. I think Boris in the UK got a lesson on "herd immunity" and fortunately for him, survived. Given the timing of the crisis, a lot of retired Canadians who winter in Florida (our "snowbirds") have returned home from one of the hardest hit areas of the USA and had to go through yet another hard hit area (NY). A number returned with the disease. We do count what's going on in our nursing homes and they have been very hard hit. Sadly they are not set up like hospitals. Isolation is a challenge for them and the workers are just not used to handling something like this. Sadly, a lot of seniors are passing away prematurely. What is good, are the various reports of nature bouncing back as human activity slows - whales off Marseilles, the Himalaya's visible from 200 km away, noticeably less pollution in China and elsewhere, fuel consumption is way down, there are few contrails in the sky (and green house gas from them is going down), wildlife is appearing in cities. Nature is telling humanity something here and we would be wise to listen. As maintainers and asset management people, we have a role to play in keeping our planet healthy. Efficient running equipment consumes less energy and helps our atmosphere. Ensuring that containment works keeps our planet's earth, water and air cleaner. Making sure our designs are functionally capable of doing the least harm is needed, perhaps more than pure myopic return-on-investment. Life is precious - we can see that as many are losing loved ones unexpectedly. Reliable assets are safer! When things ramp back up, let's make sure they do it with speed and efficiency and cleanly. We are an important part of earth's recovery and we will be (as we always have been) a part of sustaining it. Now let's do a better job!
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