A spare part, spare, service part, repair part, or replacement part, is an interchangeable part that is kept in an inventory and used for the repair or replacement of failed units.
Boilers with Auxiliaries i.e. ESP’s, Grates, Safety valves, Soot blowers, Burners, Valves, Bed nozzles, Coal mill spares, Drum level gauges, FGCS, Bag house filters etc.