Purpose
The Franco–Crosti boiler is a modification of the conventional fire tube boiler design used on most steam locomotives. Unlike conventional boilers the heat remaining in the exhaust gases is used to preheat the water supply for the main boiler using a secondary heat exchange mechanism. This mechanism, known as the feedwater heater is essentially a secondary boiler. The preheated feedwater is fed at full boiler pressure into the main boiler via clack valves.
The feedwater heater is not designed to produce steam, instead raising the temperature of the feedwater. This allows the heater to utilize the remaining energy in the exhaust gases effectively.
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