an aggregate of equipment used to obtain steam under pressure (or hot water).
A boiler installation consists of a boiler unit and auxiliary equipment such as gas flues, air ducts, steam and water pipelines and fittings, and induced and forced draft equipment. Low-power boiler installations usually do not have all of the above auxiliaries, but they do include a feed pump with accessories and equipment for water treatment. Such boiler installations, like water-heating boilers and powerful plants of heat and electric power stations and industrial enterprises, usually consist of several units located in a boiler room (boiler shop), with a common feed main and with sectionalized steam piping. A boiler room usually has standby (backup) boiler units, so that a unit can be repaired without a decrease in the total output of steam or hot water. High-power boiler installations operating with intermediate steam superheating are a part of an aggregate called a boiler-turbine unit. In this case the repairs of the boiler plant, turbine, and generator are conducted concurrently. High-power boiler installations occupy a space of hundreds of thousands of cubic meters, burn as much as 600 tons of fuel per hour, and produce up to 4,000 tons of steam per hour.
I. N. ROZENGAUS