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The Howden-Johnson boiler tried to improve the poor water circulation in the
common
Scotch fire-tube boilers by adding water tubes in a dry-back
combustion chamber. It was claimed that this modification made the
Howden-Johnson boilers 10 per cent more efficient than
conventional Scotch fire-tube marine boilers. The Howden-Johnson
boilers as well as the
Prud'Hon Capus boiler failed to make an impact despite of
these advantages, the disadvantages of the hybrid arrangement being greater
than the advantages.
The operation pressure was 15 bar and the steam was superheated to 307°C.
The red coil, between the convection water-tubes and the smoke tubes, is the
superheater.
The Howden-Johnson marine steam boiler without the common
dry-back combustion chamber mounted.
Part of the superheater is visible above the convection water-tubes
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