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Monitoring Load-Pin Stresses Cuts Crane Maintenance Costs

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TJ McDermott
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Re: The smart crane
TJ McDermott   5/9/2013 10:24:55 PM
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Rob, I think there should be rebuttal to your statement about wasted money replacing parts still in good working order.

Alaska airlines flight 261 crashed into the Pacific Ocean because a jackscrew was put back into service after passing maintenance checks that were inadequate.  It suffered excessive wear because of inadequate lubrication (maintenance at fault there).

The information I had at the time said it was still .001" in tolerance.

The part was still in "good shape" (it was still within tolerance).  Expected wear was .001" per 1000 flight hours, while Alaska was actually getting 12 times as much (.012" per 1000 hours).

There were a number of chances to avert the accident; one of them was to accept the cost of replacing a "good" part that was so close to being bad.

Replacing parts that are still good keeps the margin of safety of a machine well away from 1.0.

Rob Spiegel
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Re: The smart crane
Rob Spiegel   5/9/2013 9:58:21 AM
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Good point, Warren. Prlobably billions have been wasted by replacing parts that were still in good shape. There is a fair chance our car oil would be effectiuve for thousands of miles more than we let it.

GTOlover
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Re: The smart crane
GTOlover   5/9/2013 9:08:40 AM
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Good point warren. I think a lot of equipment gets maintenanced when it breaks! Obviously an airplane or crane is not something you want to break, so you replace parts wether they need them or not.

However, for the politician you only need one sensor. If they speak of solving a problem, you know they are lying and need replacing!

warren@fourward.com
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Re: The smart crane
warren@fourward.com   5/8/2013 1:53:48 PM
You have to wonder how many industries could still use this technology.  Imagine the expesive parts replaced through PM that really had never been stressed.  I am thinking airplanes?  bull dozers, politicians?

Rob Spiegel
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The smart crane
Rob Spiegel   5/8/2013 10:56:18 AM
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This is a good way of managing the ownership or rental of a crane. This type of analysis has been used on plant equipment for nearly a decade now. In many cases, the data readings go to the machine vendor who maintains the machine's uptime for the manufacturer. Smart equipment makes efficient equipment.

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