Boiler barrel

Boiler barrel

This topic has 4 replies, 4 voices, and was last updated 27 April 2021 at 14:18 by Zan.

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27 April 2021 at 11:31 #541829
Peter Simpson 1
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@petersimpson1
The boiler barrel on my 5" gauge BR Standard 2 has dimensions of 12" long, 4.5" diameter at the front tube plate and 5" diameter at the throat plate and is a true taper along it's length. As I do not have a set of rollers, would it be practical to purchase a 13" length of 5" OD copper tube and cut it down the centre line then form the taper over a wooden former ?
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27 April 2021 at 11:31 #10815
Peter Simpson 1
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@petersimpson1
27 April 2021 at 12:05 #541832
Nigel Bennett
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@nigelbennett69913
Yes, you can do that. Likely to be a bit more expensive than the equivalent sheet material though. However, if you anneal the sheet first you can easily persuade it round a wooden former. Irrespective of which method you use, you will need a butt strap fitting along the joint.
27 April 2021 at 12:56 #541839
Paul Lousick
Participant
@paullousick59116
Why such a big taper? Why not use a boiler without a taper ?

Boilers were originaly made this way because tthey were too long to roll out of 1 sheet. Instead they were made by rolling a number of shorter lengths with a slight taper so that the smaller end could fit into the larger end of the next piece and them rivetted tobether. (or are the BR boilers different to most others). I assume the boiler will be lagged and you won't see it anyway.

Paul.
27 April 2021 at 14:18 #541861
Zan
Participant
@zan
Paul So u would need a barrel at the diameter of the smoke of size meaning a reduction of size and water capacity at the firebox cleading would still need to be tapered for correct appearance and possible problems with top feeds ad s valves

I understood the taper was about improving water circulation and reducing the diameter of the smoke box to allow even a short chimney to be within the loading gauge. Plus various other thermal issues

edit…l blasted autocorrect!

Edited By Zan on 27/04/2021 14:20:31
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