"William Wixon" wrote in message
...
oops. i meant "number 474..." and "...off the INSIDE of the tubes in a
steam engine...." did/do heat exchanger tubes in a steam engine get
cruddy?
or i guess maybe even a stationary boiler.

Nope, not for steam engines. Also it wasn't made to have extensions added
to it.

i went to china in 1986 and they were still using steam engines there. it
was marvelous to ride through the terraced hills of china on a fire
breathing dragon. i WISH i had the presence of mind to have begged or
bribed a ride in the engine!!! one night i stayed in a hotel near a train
yard and it was wonderful to hear a steam engine starting up with a heavy
load ("CHUFF CHUFF CHUFF") then the drive wheels breaking loose
("chuffchuffchuffchuffchuff") and the engineer cutting the power and
starting up again ("CHUFF CHUFF CHUFF") was wonderful. like time
travel.

Sounds like fun.


Rob