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From: ahughes@dg-rtp.dg.com (Arch Hughes)
Newsgroups: sci.space,sci.astro,sci.space.shuttle
Subject: Re: Shuttle scrubbed again
Message-ID: <1001@dg.dg.com>
Date: 26 Sep 90 14:56:30 GMT
References: <1990Sep17.224055.1343@murdoch.acc.Virginia.EDU> <993@dg.dg.com> <1990Sep25.152824.15327@murdoch.acc.Virginia.EDU>
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In article <1990Sep25.152824.15327@murdoch.acc.Virginia.EDU>,
gsh7w@astsun.astro.Virginia.EDU (Greg Hennessy) writes:
|> In article <993@dg.dg.com> ahughes@dg-rtp.dg.com (Arch Hughes)
writes:
|> #Anyone know what concentrations of hydrogen are capable of causing a
|> #real explosion?          
|> 
|> About 4 percent, or 40,000 ppm. The limit for a shuttle launch is
|> 1,000 ppm.
|> 
|> 
|> --
|> -Greg Hennessy, University of Virginia
|>  USPS Mail:     Astronomy Department, Charlottesville, VA 22903-2475
USA
|>  Internet:      gsh7w@virginia.edu  
|>  UUCP:		...!uunet!virginia!gsh7w

Why is there such a great gap between the launch limit and the 4% 
concentration?  If the limit was 2% (20K ppm) wouldn't there be ample
time to scrub as the limit was exceeded, and vent the gas?