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LBSC 3 1/2 Britannia

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Brian G08/02/2019 19:21:38
912 forum posts
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My son hopes to build a 9F and was advised that the combustion chamber should be omitted as the tubeplate is completely inaccessible once the boiler is complete, making it impossible to correct any problems except by heating the whole boiler and sloshing soft solder around it. (Is that even allowed under the current codes?) To quote Martin Evans (in 1980) "not an ideal solution perhaps, but this may be why combustion chambers are not too popular among model engineers today!".

Brian

Jon Lawes09/02/2019 13:41:45
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1078 forum posts
Posted by Brian Oldford on 08/02/2019 19:06:09:

Basically the area of the tube nest of the inner throat-plate is moved into the boiler barrel thus shortening the tubes and increasing the firebox volume. In the case of the Brit and the 9F the extended firebox crown is stayed by means of a number of vertical water tubes passing through the combustion chamber. IYKWIM

Excellent, thanks Brian. When I got rid of the siphon tubes my intention was to move the inner throat plate back to a sensible place, I guess omitting the combustion chamber.

Brian Oldford09/02/2019 17:24:28
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686 forum posts
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Posted by Jon Lawes on 09/02/2019 13:41:45:
Excellent, thanks Brian. When I got rid of the siphon tubes my intention was to move the inner throat plate back to a sensible place, I guess omitting the combustion chamber.

Whilst there are advantages to your proposed simplification it is possible that the now longer tube/flue sizes may become non-optimal.

I know of two instances where people built combustion chambered boilers then lightly inverse hydraulically tested the assembled firebox and tube nest by blanking off the grate aperture and the smokebox ends of the tubes and flues before moving on to further boiler assembly.

Your choice, of course.

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