[modeleng] Re: Alloy boiler
- From: "Phill Smith" <steam@xxxxxxxxxxxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Mon, 6 Jul 2009 21:09:07 +0800
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
>
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