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Fw: [Cob] cob/earth oven also heating hot tub intake? Boiler partsBill&Julie wbates at mn.rr.comMon Jan 3 10:36:18 CST 2005
----- 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************************ >
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