[modeleng] Re: steel boilers & Cu flues

My 5" vertical boiler is built the way you propose Patrick, with about 20 cu
tubes silver soldered in - it has been trouble free for 20 years+ HOWEVER,
since it was done the silver soldering of cu tubes into steel plates has
become non-kosher over here, expanding and rolling being now the only
acceptable method
----- Original Message -----
From: "Patrick Coppens-Marian Lynch" <develop@xxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Tuesday, September 18, 2007 7:18 AM
Subject: [modeleng] Re: steel boilers & Cu flues


> Thanks for the comment Harry,
> The reason I launched this question,was, the fact that Cu expands a lot
> more then Fe does.
> I know that,since all the Cu parts will be immersed in H2O, the delta T°
> will not be so much, but I still wonder, if this wouldn't have an effect
> on loosening the tubes in the flanges.
> On the note of rolling versus silver solder, I too believe, that rolling
> is to be preferred, if it was only to make replacing tubes simpler.
> Cheers
> Patrick
>
> Harry Wade wrote:
>
> >At 07:55 PM 9/17/07 +0200, you wrote:
> >
> >
> >>I intend to make a boiler (a test boiler) - Patrick
> >>
> >>
> >
> >Patrick,
> >     This is common practice amongst steel boiler builders over here and
> >makes for a good combination.  The only disagreement among builders is
> >whether to silver solder or roll the flue ends.  Since I am a copper
boiler
> >builder I have no choice but to silver solder but were I to build a steel
> >boiler I believe my preference would be to roll the flues rather than
solder.
> >
> >
> >Regards,
> >Harry Wade
> >Nashville  Tennessee
> >
> >MODEL ENGINEERING DISCUSSION LIST.
> >
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line.
> >
> >
> >
>
>
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