[modeleng] Re: steel boilers & Cu flues

At 11:18 PM 9/17/07 +0200, you wrote:
>I know that since all the Cu parts will be immersed in H2O, the delta T=B0=
=20
>will not be so much, but I still wonder, if this wouldn't have an effect=20
>on loosening the tubes in the flanges.

Patrick,
       This combination doesn't seem to present a problem, or one that
produces complaints which need to be aired out with any regularity, in the
US else I'd have heard it.  However as with so may other things, the
quality of the first installation job has a lot to do with how well the
joint seal holds up.  I know that occasionally leaky Cu flues need to be
re-rolled (or re-swaged), and that produces some conversation, mostly over
where one might find a set of rolls that small.  Hopefully a steel boiler
builder will offer their experience.

Regards,
Harry

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