-=> Quoting Alec Cameron to Gregory Procter <=-
 AC> Hi Gregory
 AC> On (01 Aug 97) Gregory Procter wrote to Alec Cameron...
 >> CONTINUED FROM PREVIOUS MESSAGE <<
 AC> I wonder what the special advantage of a flash boiler is. Quick heat
 AC> up from cold?
 GP>       The long firing up process is definitely a expensive disadvantage
 AC> ==========
 GP>       With a semi-flash boiler able to supply the average steam
 GP> requirement, the
 GP>       reserve steam capacity of the boiler could be greatly reduced and
 GP>       therefore the total boiler size could be smaller.
 AC> =======
 AC> Has this actually been done for locos? A practical disadvantage, might
 AC> be the risk of damage due to unbalanced firing ie too much fire while
 AC> too little throttle. The sluggishness of a conventional [steel wheeled]
 AC> pressure cooker, gives the fireman early warning of troubles in store,
 AC> assuming he is awake and sober.
I don't think so, probably the "Sentinal" and "Kittel" vertical boilers had a
degree of "flash" heating? This is one of those areas where a lot of money
could be spent working out the optimium design.
There were suggestions from engineers that other gases than water could be
used in a closed cycle system.
(I know, water isn't a gas :-)
 AC> Next message?
Greg.P.
  
... Catch the Blue Wave!
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