Co-fired process heater
Co-fired process heater means a process heater that employs burners that are designed to be supplied by both gaseous and liquid fuels on a routine basis. Process heaters that have gas burners with emergency oil back-up burners are not considered co-fired process heaters.
Source
40 CFR § 60.101a
Scoping language
Terms used in this subpart are defined in the Clean Air Act (CAA), in 60.2 and in this section.