The Schwarzkopff-Löffler System
Another way to avoid scaling in the HP boiler is to use steam alone to transfer the heat from the fire; steam cannot of course deposit scale. Saturated steam from an HP steam generator was pumped through HP superheater tubes which lined the firebox. There it was superheated to about 900 °F (482 °C) and the pressure raised to 1,700 psi (11.72 MPa). Only a quarter of this was fed to the HP cylinders; the rest was returned to the steam generator where its heat evaporated more water to continue the cycle.
The HP cylinder exhaust passed through an LP feed heater, and then the tubes of an LP boiler; this was roughly equivalent to the LP boiler in the Schmidt system, but was heated by HP exhaust steam not combustion gases. Steam was raised in the LP boiler at 225 psi (1.55 MPa), fed to the LP superheater, and then the LP cylinder. The LP exhaust fed the blastpipe in the smokebox. The HP exhaust condensed in the LP boiler heating tubes was pumped back to the HP steam generator. It was a complex system.
The only locomotive built using this system was the German DRG H 02 1001 of 1930. It was not a success, being hopelessly unreliable.
Read more about this topic: High-pressure Steam Locomotive
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