From: lynnmcguire5@gmail.com   
      
   On 2/4/2026 5:43 PM, Scott Dorsey wrote:   
   > Bobbie Sellers   wrote:   
   >> On 2/4/26 14:17, Ted Nolan  wrote:   
   >>> I read somewhere today that Artemis was mandated by Congress to use   
   >>> 1970s Space Shuttle tech for some reason.   
   >>   
   >> 	I don't know about any mandate but that technology worked. And hopefully   
   >> some experts in that effort were still alive and the documentation of   
   >> the older project was useful.   
   >   
   > Hydrogen fuel was a major pain in the neck during the Shuttle era and so many   
   > flights were delayed or scrubbed due to leaks.  It's true that we did learn a   
   > whole lot about hydrogen seals in the process, though.   
   > --scott   
      
   When I worked for TXU (north Texas electric company that provided 45% of   
   electric power in Texas back then), our 110 hydrogen cooled generators   
   were always dicey.  We always put the hydrogen tank farm (3,500 psig   
   five foot tall by eight inch wide tank bombs) in the clear open so any   
   piping failures went straight to atmosphere.  We used copper pressure   
   regulators and 1/4 inch copper tubing to connect the tanks to the   
   generators.  Some of our power plants had a couple of hundred of the   
   tanks and we refreshed them monthly.  The generators typically used 65   
   psig of hydrogen for cooling.   
      
   We had one hydrogen fire while I was there from 1982 to 1989 and it was   
   a doozy.  $38 million of damage, our insurance deductible was $30   
   million.  1.5 years to restore the power plant to service.   
      
   Just remember, natural gas is 40% hydrogen.  And hydrogen wants to be free !   
      
   Lynn   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)