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COCHRAN
BOILER
1. The
Cochran boiler was produced by Cochran & Co. of Annan, Scotland.
2. It
is widely used in marine practice, either fired directly by coal or oil fuels,
or else used for heat recovery from the exhaust of large diesel engines.
3. Where
such a boiler may be heated either by the exhaust gases of the main propulsion
plant, or else separately fired when in port (usually by oil rather than coal)
it is referred to as a composite boiler.
4. The
boiler is a cylindrical vertical water drum with a hemispherical domed top.
5. This
domed shape is strong enough not to require staying.
6. The
firebox is another hemispherical dome, riveted to the base foundation ring to
give a narrow waterspace.
7. The
fire-tubes are arranged in a single horizontal group above this, mounted
between two flat vertical plates that are inset into the boiler barrel.
8. The
first of these plates forms a shallow combustion chamber and is connected to
the firebox by a short diagonal neck.
9. The
combustion chamber is of the "dry back" form and is closed by a steel
and firebrick plate, rather than a water jacket.
10. The
exhaust from the fire-tubes is into an external smokebox and a vertical flue.
For maintenance access to the tubes, a manhole is provided in the hemispherical
dome.
