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Duties like heating cargo, fuel, and accommodations. Such as deck winches and pumps, where electrical machines would prove to be a hazard as in the oil industry.Within the boiler, fuel and air are force into the furnace by the burner. From there, the heat (flue gases) travel throughout the boiler.Easy access to all internal areas of the boiler including tubes, burner, furnace, and refractory, is available from either end of the boiler.
To achieve higher pressure, it would be necessary to use very thick shell and tube sheet material.
Combustion occurs within the furnace and the flue gases are roughed through the tubes to the stack outlet.
Firetube boilers are available in two, three and four pass designs.
For this reason, a watertube boiler is generally used if pressure above 350 psig design is needed.
Firetube boilers are usually built similar to a shell and tube heat exchanger.