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#71
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Jim Kingdon wrote:
The thing about ECLSS is that it requires various ducts, connections, software, and the like. Destiny has it all. Remember that it has dehumidifiers, CRDA, air quality stuff etc, as well as central ventilation system, as well as the valves to release O2/N2 from Quest into cabin. (Although I think that each module exched for node 1 also has the capability to release O2/N2). not expecting to see a retrofit which involves running a water line (for example) to an existing rack in the Lab or such. There are water lines through the CBM hatches. I think that they will eventually want to pull the water from the dehumidifier in Destiny to the O2 generator. Currently that water is bagged and brought manually to the russian segment. (there are no water lines aft of Node 1). Could one design ECLSS in a more "appliance" like way? For example, having the astronauts carry the water over in a bag and put it into an oxygen generator manually from time to time? That is what is being done right now. Could one run semi-ad-hoc lines fairly easily using things like flexible tubing Yes they "could". However, it is unlikely for the US segment since everything has been so carefully planned, not sure they will need "ad-hoc" and not sure they will tolerate ad-hoc, especially if it needs to cross CBM hatches. getting through a hatch. The standard ISS solution, as I understand it, is a through-hull on each side, followed by an EVA to hook them up. nop. the proper way is to use the connections that are already in the CBM that stay within the pressurized volume. There are a whole bunch of connections already planned/provided between CBM hatches with the "jjumpers" installed from inside the vestibule (pressurized volume). Not sure that NASA would want new holes drilled in that section though since it would invalidate the "air tight" testing that was done on earth pior to launch. Fortunatly, there are already connectors for water, air, O2, N2, water, video, power, data etc etc etc. |
#72
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Derek Lyons wrote:
Advantage: Unproven. The US has long history of preparing repair procedures, planning alternate missions, providing backups.... Unfortunatly, the USA doesn't have a long standing mentality of improvising repair procedures and requires lots of pressure to change this. 2 man EVA were "impossible" until they became absolutely necessary, at which point NASA agreed to "bend its rules". When Don Petit suggested he take apart a pump assembly to get some part needed to find the other one, he had to push NASA to allow him to thiker with abroken part because NAS procedures didn't mention any procedure to take that component apart and thus thought it was impossible. NASA has evolved to some extent when it comes to allow crew to perform autonomous tasks that have not been rehearsed 50,000 times and documented into a 4" thick manual. But it still has some way to go. |
#73
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"rk" OK, perhaps NASA doesn't like to improvise repair procedures as a fundamental way of doing business. Why would improvization be such a goal and a virtue? Improvisation is a matter of necessity. Do these random remarks have a point? |
#74
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"Revision" kentnobettsspam@techispdotcom wrote:
"rk" OK, perhaps NASA doesn't like to improvise repair procedures as a fundamental way of doing business. Why would improvization be such a goal and a virtue? Improvisation is a matter of necessity. Speaking as one who has maintained equipment far from support and with limited resources; A routine need to improvise is a sign of poor design and engineering. If it becomes a necessity, it's a sign that something is badly wrong. D. -- Touch-twice life. Eat. Drink. Laugh. |
#75
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Speaking as one who has maintained equipment far from support and with limited resources; A routine need to improvise is a sign of poor design and engineering. If it becomes a necessity, it's a sign that something is badly wrong. D. this describes the entire station project End the dangerous wasteful shuttle now before it kills any more astronauts.... |
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