Failure on a smaller scale
Failure on a smaller scale
(OP)
https://www.reddit.com/r/Wellthatsucks/comments/dx...
Some of the comments on that posting suggest that the system has no way to deal with heat input via the blender. Which does harken back to the origin of understanding of heat in the observation that it wasn't stored in the material by way of observing the boring of cannon, where heat flowed out as long as the boring operation continued. So in all these years of science and engineering it appears that someone was asleep in class for that part.
Still, it seems like a big oversight to build a pressure cooker bomb without a relief valve.
It also makes me very happy to have a conventional blender that makes a conventional mess when the lid is loose.
Some of the comments on that posting suggest that the system has no way to deal with heat input via the blender. Which does harken back to the origin of understanding of heat in the observation that it wasn't stored in the material by way of observing the boring of cannon, where heat flowed out as long as the boring operation continued. So in all these years of science and engineering it appears that someone was asleep in class for that part.
Still, it seems like a big oversight to build a pressure cooker bomb without a relief valve.
It also makes me very happy to have a conventional blender that makes a conventional mess when the lid is loose.
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RE: Failure on a smaller scale
When I got married, my grandmother-in-law got us a pressure cooker, and we used that quite a bit- eventually quit when we lost some of the seals or something of the sort.
RE: Failure on a smaller scale
Yes. Black powder can be pretty hard on seals.
RE: Failure on a smaller scale
The Vitamix can actually boil its contents solely from the frictional heating of its blades; I didn't think the NutriBullet could do that, but it wouldn't surprise me, one way or the other. I'm guessing the user bypassed the momentary ON switch to be continuously ON, and then walked away and got the thing to boil its contents, so the answer is that the user abused the system, by defeating its momentary switch, which would have forced the user to hold the switch down, in which case they would have noticed it getting uncomfortably hot.
TTFN (ta ta for now)
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RE: Failure on a smaller scale
The giveaway is that the plastic mug has a handle. The one buried in the ceiling would seem to be buried to a depth of 40-50mm and stopped only by the handle.
Must have been some bang.
Interesting video here https://www.youtube.com/watch?v=aiy4kju0ubs
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RE: Failure on a smaller scale
So the link does show a similar claim to being able to make soup in 7 minutes. According to Vitamix, it can "make steaming-hot soup in under 10 minutes"
But, unlike the Vitamix, this one has no ability to vent steam. Assuming similar capabilities, the user of this device left it on and unattended for well over 7 minutes, despite warnings in the manual. Apparently, the OPs link is not the only incident, and there are others that suffered injuries https://www.goodhousekeeping.com/health/news/a4690...
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
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RE: Failure on a smaller scale
The instructions also say there is a "souper blaster" pitcher which has a vent, but I suspect this will be lost on many users who will use any pitcher they have available. Temp rise is quoted as 40-50C in 7 minutes so if you start at 50 C with an unvented pitcher...
Definitely sounds like a recipe for disaster. https://images-eu.ssl-images-amazon.com/images/I/A...
In retrospect the original picture which started this got lucky - a hole in the ceiling is a lot easier to repair than a hole in your head.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Failure on a smaller scale
Even so, it seems like the blending cap could have a deformable section that could balloon out under pressure and push on a switch to shut off the motor if the pressure was too high. They could also have a separate blending cap for the sealed cup that tripped a switch that only allowed blending for 30 seconds at a time with a 30 second lock-out.
Yikes on the injuries in that TV news program.
RE: Failure on a smaller scale
NutriBullet can't even manufacture a flat surface on those cups, so any sort of precision beyond that is probably beyond their capabilities. We bought a set of their standard cups for their standard Bullet, and my wife was complaining about it leaking, despite having a rubber seal. It turned out that the lip the seal goes against has a large dimple due to an asymmetry at the hinge, during the injection molding. It's tiny, but it results in leaks.
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm