Easy access to all internal areas of the boiler including tubes, burner, furnace, and refractory, is available from either end of the boiler.This makes maintenance easier and reduces associated costs.The wetback boiler design has a water cooled turn around chamber used to direct the flue gases form the furnace to the tube banks.
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These types of boilers are most common because of their ability to deliver large quantities of steam.
The large tube like structure at the top of the boiler is called the steam drum. That's where the steam collects before being discharged from the boiler.
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.
Firetube boilers are available for low or high pressure steam, or for hot water applications.
Firetube boilers are typically used for applications ranging from 15-1500 horsepower.A large quantity of tubes results in more heating surface per boiler horsepower, which greatly improves heat transfer and efficiency.The furnace and banks of tubes are sued to transfer heat to the water.Boiler makers have developed various designs to squeeze the most energy out of fuel and to maximized its transfer to the water.But it all boils down, pardon the pun, to the basic design shown here.Firetube boilers are available in either dryback or wetback design.