Utah Admin. Code 307-316-3
As used in this rule:
"Boiler" means an enclosed device using controlled flame combustion of natural gas, as defined by this rule, in which water is heated to recover thermal energy in the form of steam or hot water. Controlled flame combustion refers to a steady-state, or near steady-state, process wherein fuel or oxidizer feed rates are controlled.
"Burner" means the functional component of a boiler that provides the heat input by combustion of a fossil fuel with air or oxygen. Burners are available either as part of the boiler package from the manufacturer, as stand-alone products for custom installations, or as replacement products.
"CO boiler" means a boiler that is fired with gaseous fuel with an integral waste heat recovery system used to oxidize CO-rich waste gases generated by a Fluid Catalytic Cracking Unit.
"Commercial boiler" means a boiler used in commercial establishments such as hotels, restaurants, and laundries to provide electricity, steam, or hot water.
"Construction" means any physical change including fabrication, erection, installation, demolition, or modification of a boiler which would result in an increase in actual NOx emissions.
"Industrial boiler" means a boiler used in manufacturing, processing, mining, and refining or any other industry to provide steam, hot water, or electricity.
"Institutional boiler" means a boiler used in institutional establishments such as medical centers, nursing homes, research centers, institutions of higher education, elementary and secondary schools, libraries, religious establishments, and governmental buildings to provide electricity, steam, or hot water.
"Modification" means any planned change in a boiler which results in an increase of actual NOx emissions.
"Natural gas" means:
"Process Heater" means an enclosed device using controlled flame, and the unit's primary purpose is to transfer heat indirectly to a process material such as liquid, gas, or solid, or to a heat transfer material such as glycol or a mixture of glycol and water, for use in a process unit, instead of generating steam. Process heaters are devices in which the combustion gases do not come into direct contact with process materials. Process heaters include units that heat water and water mixtures for pool heating, sidewalk heating, cooling tower water heating, power washing, or oil heating.
"Propane" means a colorless gas derived from petroleum and natural gas, with the molecular structure C3H8.
"Residential boiler" means a boiler used to provide heat or hot water as part of a residential combined heat and power system. This definition includes boilers located at an institutional facility such as a university campus, military base, church grounds or commercial or industrial facility such as a farm used primarily to provide heat or hot water for:
"Temporary boiler" means any gaseous or liquid fuel-fired steam generating unit that is designed to, and is capable of, being carried or moved from one location to another by wheels, skids, carrying handles, dollies, trailers, or platforms. A steam generating unit is not a temporary boiler if any one of the following conditions exists:
"Waste heat boiler" means a device that recovers normally unused energy such as hot exhaust gas and converts it to usable heat. Waste heat boilers are also referred to as heat recovery steam generators. Waste heat boilers are heat exchangers generating steam from incoming hot exhaust gas from an industrial or power equipment such as thermal oxidizers, kilns, furnaces, combustion turbines, and engines. Duct burners are sometimes used to increase the temperature of the incoming hot exhaust gas.
Utah Admin. Code R307-316-3