[modeleng] Re: Alloy boiler
- From: "Adrian Nash" <a.c.nash@xxxxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Mon, 6 Jul 2009 23:32:04 +0100
> 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.
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>
>
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