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acorneau
Nov 20, 2010, 10:16 PM
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Not really climbing related but I thought this might interest some of you...
In reply to: "All equipment is load-tested at least at 120 percent of the actual live load to ensure that there are no accidents during live operations," he says, adding that there were "no safety incidents during this entire project."
Read the story here:
http://www.npr.org/...age-of-nuclear-stash
(If this is inappropriate for the Lab then please move it elsewhere.)
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dugl33
Nov 20, 2010, 10:25 PM
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acorneau wrote: Not really climbing related but I thought this might interest some of you... In reply to: "All equipment is load-tested at least at 120 percent of the actual live load to ensure that there are no accidents during live operations," he says, adding that there were "no safety incidents during this entire project." Read the story here: http://www.npr.org/...age-of-nuclear-stash (If this is inappropriate for the Lab then please move it elsewhere.)
Wouldn't that be 1.2:1 (?)
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acorneau
Nov 20, 2010, 10:42 PM
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D'OH! My bad.
When I heard the story on the radio I could have sworn that he said "120 times the load..."
Never mind!!!!
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rocknice2
Nov 21, 2010, 12:25 AM
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I was so expecting this to be another Majid post
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philbox
Moderator
Nov 21, 2010, 9:16 AM
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This is probably a campground post so I'll send it there from the lab.
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bill413
Nov 22, 2010, 1:31 AM
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philbox wrote: This is probably a campground post so I'll send it there from the lab.
But wouldn't the lab be the place to determine if there is a difference between 120% and 120:1?
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Toast_in_the_Machine
Nov 22, 2010, 2:59 AM
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bill413 wrote: philbox wrote: This is probably a campground post so I'll send it there from the lab. But wouldn't the lab be the place to determine if there is a difference between 120% and 120:1?
But in the campground, we can talk about using Excel to solve the ratio problem.
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jt512
Nov 22, 2010, 6:28 AM
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philbox wrote: This is probably a campground post so I'll send it there from the lab.
Brilliant
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imnotclever
Nov 22, 2010, 1:08 PM
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The 1.2 testing is a proof test. 1.2 times the design load. This has little to do with the factor of safety.
The factor of safety is the number that is usually divided by the yield strength. Yield is where the material will start to deform. Ultimate strength is where it breaks.
So most steel is as follows:
Ultimate = 65 ksi
Yield = 50 ksi
Factor of safety = 1.5, therefore design stress = 33 ksi
A buddy of mine worked at a nuke plant, he said there they had to use a FS of 10, so they would use high strength steel with Yield at around 100 ksi and then design it for 10 ksi.
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