> Gents, > > The code in question is doomed to failure. Why, because it will be > rejected, > or, one will fail and cause it to be retracted. It is for ALL Duplex 2205 > boilers. Outer, inner, barrel, tubes and flues. > I have read the new code, and examined the material specs'. I found them > seriously lacking, and potentially dangerous. The new code is not > approved, > only under review by boiler inspectors all over the country. It was put > forward by a supplier of Duplex 2205 and an engineer who is so impractical > he's not far from useless..... I sent my professional review to my local > boiler inspector who has passed them on to the AMBSC. I recommended > against > allowing Part 4 being accepted. > > The main problems with all nickle-chrome steels (commonly called stainless > steels) is chloride embrittlement, and carbide precipitation. The chloride > embrittlement crittical temp is at a lower temp than our operating temp. > To > reduce the chloride embrittlement you could try using only double > distilled > water, but even then, the distilled water will absorb it out of the > atmosphere once it is put into the water tanks. Plus there's the practical > side of using ONLY double distilled water in your boiler.... The cost and > supply.... > The carbide precipatation will occur within the inner firebox plates, in > all > 7.25" gauge loco's if they are put under a heavey load, or with > potentially > with the blower full on..... > Both of these "problems" make the boiler subject to sudden total failure, > and are very hard to detect before failure....... > > These boilers are also imposible for the average certified welder to weld. > They require specialised processes and techniques. We are talking BIG > BICKEY'S to get made. The cost of making one of these boilers is > prohibitive > to all but a few people, as both the materials are expensive and the > welding > will cost as much, if not more. > > Anyway, I need to get of my soap box. > > > Cheers, > > Phill. > > ----- Original Message ----- > From: "Lee Grant" <leegrant@xxxxxxxxxx> > To: <modeleng@xxxxxxxxxxxxx> > Sent: Monday, July 06, 2009 4:12 PM > Subject: [modeleng] Alloy boiler > > >> AALS Convention there are 2 small photos off a boiler with the caption >> "Les Irwin's Duplex 2205 alloy boiler the prototype for the new AMBSC >> Boiler Code Part 4 available shortly" There is a short mention in the >> report that said it has been approved. >> I have never heard of anybody building an alloy boiler before. I would >> imagine they would be easier to build but surely they would need a steel >> liner in the fire box. I'm intrigued can't wait to see the new code. >> Lee >> >> MODEL ENGINEERING DISCUSSION LIST. >> >> To UNSUBSCRIBE from this list, send a blank email to, >> modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject >> line. > > > -------------------------------------------------------------------------------- > > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.5.375 / Virus Database: 270.13.5/2220 - Release Date: 07/05/09 > 17:54:00 > > MODEL ENGINEERING DISCUSSION LIST. > > To UNSUBSCRIBE from this list, send a blank email to, > modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject > line. > MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.