This code shall apply to the design, installation, operation, training, and maintenance as they relate to safety of combustion systems. It shall apply to single burner boilers, multiple burner boilers, and atmospheric fluidized bed boilers with a fuel input rating of 12,500,000 Btu/hr (3663 kW) or greater and shall apply to stokers with a minimum fuel input of 400,000 Btu/hr (117 kW), to pulverized fuel systems, and to fired or unfired steam generators used to recover heat from combustion turbines (HRSG's). This code shall cover strength of the structure, operation and maintenance procedures, combustion and draft control equipment, safety interlocks, alarms, trips, and other related controls that are essential to safe equipment operation.