The air emissions from many types and sizes of boilers are regulated by the Clean Air Act (CAA). The U.S. Environmental Protection Agency (U.S. EPA) finalized changes to Clean Air Act standards for area source boilers (40 CFR 63, subpart JJJJJJ) in 2016, and for major source boilers (40 CFR 63, subpart DDDDD) in 2015 which primarily affect industrial boilers, commercial/institutional boilers and process heaters. A process heater is used to transfer heat indirectly to a process material (liquid, gas, or solid) or to heat transfer material (e.g., glycol or a mixture of glycol and water). The definitions of affected equipment [PDF] provide more information.
Subparts JJJJJJ and DDDDD exclude [PDF] hot water heaters (no more than 120 gallons or less than 1.6 million Btu per hour), temporary boilers (capable of being carried or moved from one location to another) and any boiler that uses a biomass or bio-based solid fuel.
A major source is defined as a plant site emitting or having the potential to emit (PTE) any single hazardous air pollutant (HAP) at a rate of 10 tons or more per year or any combination of HAPs at a rate of 25 tons or more per year. An area source of HAP emissions is any source with potential emissions less than the major source thresholds for HAPs.
CTAP is available to assist Indiana’s businesses engaged in stationary engines. Contact CTAP using the CTAP Partner Portal to request help. It will require setting up a free account through Access Indiana.