Artemis launch

We use liquid nitrogen to shrink in parts with heavy interference fits. Sleeves and bushings.
I tell everybody to be safe, but at the end of the job there are usually soda bottle bombs going off.
The power of cryo fluids is deceiving in so many ways.
I got my official training with LOX where the Navy shows training videos of all the possible disasters.
They are very blunt. Cryo fluids are dangerous.
 
Phishfry said:
Too soft. Beryllium Copper is used for non-sparking wrenches.

I had no idea Liquid Hydrogen was so much colder than Lliquid Nitrogen.
-423F versus -320F
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Bronze does not only refer to copper/tin bronze. The material science course in university was fun - to a degree.

How many would go "Look how it crawls up the side of the container. How cute!" when faced with liquid helium?
Seeing the lower mm of soles still frozen to the ground where someone had jumped out of the way raises your respect for cryofluids a lot.
 
Jose said:
Definitely should not be trying this


Important safety tip: Do not soak the briquets in the liquid oxygen. They will explode when lit.
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Purdue university, that prof got a cease and desist from the fire department. Schould they catch him with LOX ever again while being near a grill/campfire they'll go nuts on him.

I think every university needs someone like that. We had one guy who would do an experiemt and then stop the time for the guy from the electrical grid company to barge in and yell "We told you 1000 times NOT TO DO THAT!!"
 
Maybe flying to the moon is akin to stepping on your doorstep. Who knows where you are a thousand steps from there, but you'll never find out without doing that first step.

You may put it into perspective. How many artemis is one twitter? Or where does ITER show up there? How many twitters is the defense budget? How many defense budgets are in the subsidaries for fossill fuels?
The biggest problem humanity has is that the wrong problems get the attention and money.
 
Crivens said:
I think every university needs someone like that.
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When I was a grad student, our physics department had one of the very few liquid nitrogen making machines in the area. Once a year, the machine needs to be disassembled, cleaned, a few parts replaces, and most importantly: recalibrated. That's because any machine that can make liquid nitrogen can also make liquid oxygen and liquid argon, just by adjusting it (in-) correctly. Since LOx is very dangerous, it's important to regularly check the destillation part of a liquid nitrogen maker, to make sure it is really making LN2. The way our technician/machinist showed us: He deliberately misadjusts the machine too hot, until nothing comes out, then keeps adjusting it until some blu-colored liquid forms (which is LOx), then nothing, then a small amount (which is LAr), then a long range of nothing, and finally you get it adjusted just right at the bottom, and a heck of a lot of LN2 comes out. To be absolutely sure you are on the right side of the LOx temperature, you have to first see the large amount of LOx, then the small amount of LAr, and finally the flood of LN2, all going in one direction.

In this process, you end up with a few liters of LOx. The easiest and safest thing to do would be to let it evaporate, but that's not fun. Instead, you soak a few charcoil briquettes in it it (just a few), then put them in a BBQ, and light them with a very long stick. The explode like big firecrackers. Physics students love that kind of stuff.

The rest of the year, there was no way to get LOx.
 
I'd read that LN2 is made by fractional distillation of liquefied air, but had never heard a first hand account like yours. Thanks!
 
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