The Prud'Hon Capus 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 Prud'Hon Capus boiler 10 per
cent more efficient than conventional
Scotch fire tube
marine boilers.
The Prud'Hon Capus as well as the
Howden-Johnson
boilers failed to make an impact despite of these advantages, the
disadvantages of the hybrid arrangement being greater than the advantages.
The red coil, to the right of the
convection water-tubes, is the superheater.
A Prud'Hon Capus marine steam boiler with the common dry-back combustion
chamber open for service.
Two fire-tubes and some of the convection water-tubes are visible on this
picture.
Thirty-two Prud'Hon Capus boilers were installed onboard the
cruise liner Ile de France in 1927. The operation pressure was 16 bar.
The swedish steamer Soya Lovisa was equipped with two Prud'Hon Capus boilers in
1954.
