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   sci.space.policy      Discussions about space policy      106,651 messages   

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   Message 105,858 of 106,651   
   pnn calmagorod to All   
   Re: Testing of quick disconnects   
   12 Sep 22 01:18:16   
   
   From: calmagorod@gmail.com   
      
   Il giorno sabato 10 settembre 2022 alle 18:21:39 UTC+2 JF Mezei ha scritto:   
   > Not sure if there is anoyone left in the group, but just in case.   
   >   
   > Consideirng SLS has been in development for over 10 years, considering   
   > they already had quick disconnect experience for H2 refueling on   
   > Shuttle, I am curous on what constraints would have prevented them from   
   > developping a reliable H2 fill line quick disconnect for SLS ?   
   >   
   > I take it that they can't test it at VAB because they don't have LH2   
   > lines there. (and leaking H2 indoors, not a great idea).   
   >   
   > But when this quick disconnect was designed, wouldn't it have had some   
   > real testing with LH2 to ensure it works well and that any limitations   
   > and maintenance requiremenmts (eg: change rubber seals every X refills)   
   > would be well known.   
   >   
   >   
   > And considering the number of tests they did of this rocket, how come   
   > this quick disconnect problem didn't get noticed before ?   
      
      
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   It is a physical law,   
   Continue till to the disaster   
      
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