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

[Bill&Julie]

----- Original Message ----- 
From: "Bill&Julie" <wbates at mn.rr.com>
To: "drub" <drub at pobox.com>
Sent: Monday, January 03, 2005 7:52 AM
Subject: Re: [Cob] cob/earth oven also heating hot tub intake? Boiler parts


> Hi All,,, From metallurgy 101 ,, we find that most metals that get more
>
> than 400EF for a few hours will start to loose their temper/ hardness.
>
> That is why there was so much resistance to Non- cast Iron engine blocks.
>
> Ever wonder why CAST IRON Skillets are Cast Iron???
>
> Because cast iron can take a lot of heat, for a long time without losing
>
> temper/ hardness.....
>
> Now, back to 7th Grade Science,, at Sea level, an open pan of water can
>
> not get hotter than 212EF...
>
> Ever see a plumber solder on a pipe that still has water in it????
>
> That is a trick that VERY FEW, have been able to do...
>
> In fact I would pay to take lessons...
>
> So,, if enough water is flowing fast enough though a pipe, the pipe
>
> will not get to 212EF ,, and that is not even close to 400EF...
>
> Also, when I was a Boys Camp, many, many long years ago.
>
> We made a campfire water heater, form 8 foot of 3/4 inch copper
>
> pipe, a one way valve, and a 5 gallon bucket. The pipe was bent
>
> into a loop, and connected to the bottom of the bucket with the
>
> one way valve. The other end went back into the top of the bucket.
>
> We filled the bucket, and laid the loop in the
>
> campfire. The water Chugged, and spirted,, and before too long,
>
> we had 5 gallons of boiling water....
>
> We used it for the week to wash the dishes,,, don't know what ever
>
> happened to it after that...
>
>
>
> bill  ô¿ô
>
> ----- Original Message ----- 
> From: "drub" <drub at pobox.com>
> To: <coblist at deatech.com>
> Sent: Sunday, January 02, 2005 9:22 PM
> Subject: RE: [Cob] cob/earth oven also heating hot tub intake? Boiler
parts
>
>
> Clipped****************>
> > 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.
> >
> Clipped******************
> > All the best,
> > David
> >
> >
> >
> CLIPPED************************
>