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Most conventional steam boilers are classed as either firetube

Most conventional steam boilers are classed as either fire-tube or watertube types in the fire-tube type, the water surrounds the steel tubes through which hot gases from the furnace flow the steam generated collects above the water level in a cylindrically shaped drum a safety valve is set to allow escape of steam at pressures above normal operating pressure; this device is necessary on all boilers, because continued addition of heat to water in a closed vessel without means of steam escape.

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