How does a steam "fired" kettle work ?
I understand there is a steam jacket but that is all I know. The steam is injected into the cavity between the kettle and the jacket and then what ?
Where does the steam/condensation exit ?
How hot is the boiler/steam ?
What happens if there is condensation in the steam jacket ? Where does the water go ?
What pressure is the steam jacket run at ?
Disclaimer - I am not a steam or boiler engineer, and it has a been a long time since those engineering thermodynamics courses.
The steam would come in at high Temp and Pressure and once the steam loses heat, some will condense, and there would be a condensate drain, and the condensate would return to the boiler reservoir.
The temperature depends on the pressure of the system, at 15 PSI (29.7 PSI absolute) the temp is about 249F, which would boil wort if there is enough supply steam. I don't know what brewery boilers operate at, 10 PSI (24.7 PSI absolute) would probably get a boil going.http://docs.engineeringtoolbox.com/documents/926/water_pressure_boiling_temperature.pdf
Steam systems are not to be taken lightly, inspections and other certification are needed. Bad things can happen with steam under pressure, so one needs to have safety in mind with steam applications.