[Cob] cob/earth oven also heating hot tub intake? Boiler parts

[drub]

Hi all,

Sure don't want to sound like the expert....  My $0.02

A little background.  I spent a good deal of my youth in the Willamette
Valley, in the Albany area.  Worked on farms that grew and processed mint
and dill.  The processing employed a still to extract the mint and dill
oils.  Boilers weres used to generate the steam.

I queried the elder folks about why the boilers are predominantly cast iron.
It seemed so "old-fashioned" and difficult to fabricate.  The elders
explained that other materials oxidize more rapidly and that cast iron is
the longest lived in high heat settings.

So, it would seem a good idea to use parts from a boiler for the purpose of
heating water.  They are built for the purpose.

I believe "iron pipe" is really a steel formulation so will have a tendency
to oxidize and fail, especially where 2 pieces meet at a fitting like an
elbow, coupling, etc.

Again, I'm no expert.  This is food for thought and discussion.  I hope
someone else responds with the correct chemical/metallurgical analysis.

Happy New Year!

All the best,
David



> -----Original Message-----
> From: coblist-bounces at deatech.com [mailto:coblist-bounces at deatech.com] On
> Behalf Of KC Chandler
> Sent: Sunday, January 02, 2005 2:56 PM
> To: Tys Sniffen; coblist at deatech.com
> Subject: Re: [Cob] cob/earth oven also heating hot tub intake?
> 
>  From: Tys Sniffen
> [ I would like to build a cob baking oven and run copper piping through
> it,]
> 
> You can purchase stove coils of almost any maleable metal (obviously not
> iron). My preferance would be stainless steel... for strength and in the
> eventuality that you may want your water potable.
> 
> ~KC
> _______________________________________________
> Coblist mailing list
> Coblist at deatech.com
> http://www.deatech.com/mailman/listinfo/coblist