From: henry@spsystems.net   
      
   In article ,   
     wrote:   
   >I read that the RP-1 and LOX tanks share a common bulkhead.   
   >How do you keep the RP1 from turning to wax at LOX temperatures?   
      
   Remember, you typically won't have *liquids* on both sides of that common   
   bulkhead:  you'll have liquid above it, and the ullage space of the lower   
   tank below it.  So a cold liquid above will cool the pressurant gas, but   
   won't have much other effect.  If the cold side is down below, there may   
   be no effect at all, given that you probably want to pressurize with warm   
   gas to reduce gas mass.   
      
   The classical Atlas had a common bulkhead -- a thin sheet of stainless   
   steel, which as usual on Atlas, was stiffened by pressure difference --   
   between LOX (above) and kerosene (below).  Originally it had insulation on   
   it, but they eventually decided that the insulation wasn't doing anything   
   useful, and deleted it.   
   --   
   "Think outside the box -- the box isn't our friend."    |   Henry Spencer   
                                   -- George Herbert       | henry@spsystems.net   
      
   --- SoupGate-Win32 v1.05   
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