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Astronauts told to return to ISS after sheltering over air leak repairs

bbc.com

51–60 of 283 posts

Re: Astronauts told to return to ISS after sheltering over air leak repairs

#51
post #45

Earlier quoted context omitted.

There are normally-open air-tight hatches between modules. Various utility connections and air ducts are normally run through the open hatches so it would take a bit of work to disconnect these connections before they could be closed. Not exactly something you want to be doing under time pressure.

What’s the reason against separate conduit for utilities?

Just a guess: Harder to build and operate with more failure modes and less opportunity for intervention.

Re: Astronauts told to return to ISS after sheltering over air leak repairs

#52
post #20
post #16

Maybe someone who knows more about the ISS than I do can answer this: Naively, I would assume that there are airlocks between the different sections of the ISS. I would also assume that they would close these airlocks while doing the kind of work they are doing to repair the leaks. So, assuming I'm right (and my assumptions might be wrong,) why do the astronauts need to shelter?

Well, I won't claim to know the answer, but "please do not move between different airlocked sections while this work is underway" sounds a lot like the definition of "shelter" to me

In this case, per the article, "shelter" meant "shelter in a capsule capable of returning to earth and put on the spacesuits that you wear during return to earth".

I.e. leaving the actual ISS structure entirely.

Re: Astronauts told to return to ISS after sheltering over air leak repairs

#53
post #45

Earlier quoted context omitted.

There are normally-open air-tight hatches between modules. Various utility connections and air ducts are normally run through the open hatches so it would take a bit of work to disconnect these connections before they could be closed. Not exactly something you want to be doing under time pressure.

What’s the reason against separate conduit for utilities?

Those would need to be connected during docking and sealed separately anyway if you wanted to seal the hatch. More failure points.

Re: Astronauts told to return to ISS after sheltering over air leak repairs

#54
post #45

Earlier quoted context omitted.

There are normally-open air-tight hatches between modules. Various utility connections and air ducts are normally run through the open hatches so it would take a bit of work to disconnect these connections before they could be closed. Not exactly something you want to be doing under time pressure.

What’s the reason against separate conduit for utilities?

You'd still need to pull out the utilities and close a now second hatch in the conduit to seal the thing. What would be the point?

Re: Astronauts told to return to ISS after sheltering over air leak repairs

#55
post #45

Earlier quoted context omitted.

There are normally-open air-tight hatches between modules. Various utility connections and air ducts are normally run through the open hatches so it would take a bit of work to disconnect these connections before they could be closed. Not exactly something you want to be doing under time pressure.

What’s the reason against separate conduit for utilities?

If such a conduit would connect two sections that the hatch is meant to isolate, you would have to make the conduit and everything running through it airtight, even under a catastrophic loss of air. If the conduit didn't seal as well as the hatch, which is meant to withstand hard vacuum on the other side of it, it would defeat the purpose of the hatch.

Re: Astronauts told to return to ISS after sheltering over air leak repairs

#56

Imagine something like this happening halfway to Mars and zero chance of escaping, getting any help or parts sent to you.

Recently started an embedded hardware/software job. Shipping firmware to the manufacturer feels like that for the device classes that have no internet.

I can’t quite imagine, even shipping on prem stuff is much harder than the cloud. Especially when people can mess with stuff

Re: Astronauts told to return to ISS after sheltering over air leak repairs

#57
post #12

Earlier quoted context omitted.

There is less debris around on the way to mars and this is a known and worsening for the ISS due to its age.

A top (arguably, the top) metallurgist who studied previous failed parts told me it's corrosion of the Russian alloy used. Corrosion is a hard problem in living quarters (ie moisture and salt) in space (sealed with no gravity)

I was wondering about this as well. In theory, there are also some metals and compounds that react with each other with just simple contact which result in some kind of amalgamation which can result in disastrous structural loss. Veratassium recently did a video on this kind of effect[1]. Could this be happening here?

[1]: https://youtu.be/ksn5yrsC3Wg

Re: Astronauts told to return to ISS after sheltering over air leak repairs

#58
post #16

Maybe someone who knows more about the ISS than I do can answer this: Naively, I would assume that there are airlocks between the different sections of the ISS. I would also assume that they would close these airlocks while doing the kind of work they are doing to repair the leaks. So, assuming I'm right (and my assumptions might be wrong,) why do the astronauts need to shelter?

[dead]

Re: Astronauts told to return to ISS after sheltering over air leak repairs

#59

Earlier quoted context omitted.

The 10 non-Russian modules have been in vacuum for a quarter century and have done just fine despite facing more debris than in interplanetary space. So yes, this aspect is well tested. This stuff is literally part of the reason why the ISS exists in the first place.

The hubris of forgetfulness; to think that until Elon showed up the West couldn't even put a person in space anymore. The Soyuz, the MIR, the human space records, the Venera program, closed cycle rockets, all have no equivalent in the West. Even their version of the shuttle was superior (it flew 100% autonomously). I don't like Musk, but he single handedly saved the Western space programs.

I didn't realize Buran flew, and flew autonomously. Impressive for the times.

Re: Astronauts told to return to ISS after sheltering over air leak repairs

#60
post #52
post #20

Earlier quoted context omitted.

Well, I won't claim to know the answer, but "please do not move between different airlocked sections while this work is underway" sounds a lot like the definition of "shelter" to me

In this case, per the article, "shelter" meant "shelter in a capsule capable of returning to earth and put on the spacesuits that you wear during return to earth". I.e. leaving the actual ISS structure entirely.

I would guess they're worried about breaking something, but thanks for the clarification (and apologies for not having RTFA)
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