"N_Cook" wrote in message
...
Grumpy wrote in message
. au...
Snip

The OP wanted to reshape some of them oval to fit two new caps in. I
would keep the can intact. In other well-developed collecting areas
like firearms -any- modification including refinishing reduces value.
I think the practice is to save the original parts for show if you
want to make the device functional. That's what I do based on museum
exhibits.

Snip


We run into the appearance/ functionality/ safety argument regularly at
the
museum where I volunteer as restorer of old machinery. Steam powered
stuff
is a real problem as old boilers weren't built to codes and are difficult
to
get registered. Riveted boilers are a real problem if the barrel isn't
covered with lagging and cladding. I know of one boiler on a replica
steam
boat that has rivet heads attached to the boiler with high temperature
adhesive. The boiler is of all welded construction and the rivet heads
are
just for appearance. I have been known to slip in stainless steel
components
occasionally to reduce the corrosion and maintenance. They aren't
authentic,
but they save a lot of maintenance time.
We have a significant steam traction engine to restore in the near
future
but the boiler is beyond repair to the extent that it could ever be
safely
operated. We have accepted the fact that it will never operate on steam
so
we will bypass the boiler and operate it on compressed air.




What is the safe replacement for asbestos lagging these days? I have seen
it
"flowing" like water out of rusty holes in an old boiler external cladding
and getting airbourne glistening in shafts of sunlight coming through
holes
in the rusty shed around the boiler


Good point!

Luckily, we don't have that problem as the cladding had rusted off it and
the lagging had dissapeared long before we aquired it. If asbestos is
detected in a peice of machinery, it is either removed by professionals or
sealed in place if it is impossibel to remove. If its removed it is usually
replaced with rock wool. It can handle the relatively low temperatures that
older steam stuff generates without problem. If you do need higher
temperature rateing use Kaowool. Its a ceramic wool and really good!