[modeleng] Re: Model boiler sizes and designs
- From: Mike Leahy <heisler9-modeleng2@xxxxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Fri, 13 Apr 2012 18:30:30 +0100
Barrie
The problem is that the model engineer's boiler testing regime is as
much an insurance issue as it is to do with boiler test codes.
The majority (nearly all) of model engineering clubs, and their
boiler inspectors, are covered by insurance schemes arranged by the
Southern Federation of Model Engineering Societies or the Northern
Association of Model Engineers. These policies limit models to no
more than six inch scale (half size) so a model is in a smaller
representation of a larger prototype (yup, I know about non-
prototypical designs, ie Simplex). There are some small steam plants
that were commercially built and marketed for trade/practical use,
other than as representation of a model of a larger machine. Their
use could be construed as other than a modeling activity. Now if you
were to build a boiler that was the same size as was sold to
originally power such a machine it might not be seen as being a
model. However, if the boiler could be shown to be a less than six
inch scale representation of the original design then no problem.
Hope that all makes sense!!!!!
The boat issue was covered by permitting steam powered plants in
model boats providing they are a scale model of a full size boat and
does not carry anyone. (Someone has yet to challenge the scale issue
by building a half size QE11!!!!)
ChrisC originally wrote........ "Looking for something in the 80-100
psi range under the assumption that this would be a sensible value
for a double-expansion engine..." Unless he is building something
at an extremely large scale I don't think he will need a boiler that
will fall outside the code.
Phill wrote:
> Hmmm That doesn't make sense....
>
> How can a 1/12 beam engine not be a model ?????? It is still an
> industrial
> engine, technically....... But So is a 3.5" gauge loco, still
> technically a
> locomotive, and therefore not a model.........
>
So a scale boiler for a 1/12 beam engine is not a problem, providing
it meets the bar-litre criteria.
Want to go bigger than the code/insurance limitations permit, you
still don't have a problem, you will just need to get your boiler
commercially tested.
Regards
Mike Leahy
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