[modeleng] Re: Expanding boiler tubes

And, when you think about it, the expansion differential works in your
favour to help seal the tubes - when the thing gets 'ot the tubes get
tighter.

You might have hit the nail on the head there Ec - boilermaker makin' sure
he gets some return business.

Full size locos used the copper tube/steel boiler system. Over here tho' the
tubes at the firebox end have to be not only expanded in but also beaded
over. Not particularly hard to do with home made tooling but is really
another example of AMBSC overkill.



> The trouble with steel tubes is they don't last long, copper will last the
> life of the boiler.The boilermaker  will make more money renewing the
steel
> tubes.
>
> E.W.
> ----- Original Message -----
> From: "Roger" <roger.g3tdm@xxxxxxxxxx>
> To: <modeleng@xxxxxxxxxxxxx>
> Sent: Wednesday, January 26, 2005 4:34 PM
> Subject: [modeleng] Re: Expanding boiler tubes
>
>
> > Hi,
> >
> >     Andy asked:
> >
> >>How do I go about expanding copper  tubes into a steel boiler?
> >>
> >    I see that you have had various ideas suggested,  including the
> > proper way with a roller tool.
> >
> >    I friend of mine who had a leak at the firebox end of an engine and
> > didn't have a proper roller tool discovered that an expanding masonry
> > bolt (Rawl Bolt) could be used to expand the tube - it certainly
> > worked,  but is not the recommended method!
> >
> >    If you do the arithmetic it is surprising just how much more the
> > copper expands,  compared to the steel shell - it is no wonder that the
> > tubes leak where they go into the steel plates.   I talked to a
> > professional boiler builder about this and he reckoned a steel boiler
> > with copper tubes always gave trouble and recommended that the copper
> > tubes be replaced with steel tubes expanded into place.
> >
> >    Just thought you would like to know about the above!
> >
> >
> >       Cheers,
> >
> >
> >          Roger Mason,  in St. Agnes.
> >
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>
>
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