Applicability to natural gas industry

A spark ignition (SI) engine, or gasoline engine, is a type of engine in which the fuel-air mixture in the combustion chamber is ignited by a spark from a spark plug. Stationary engines are used in a variety of applications from generating electricity to powering pumps and compressors. They are also used in the event of an emergency such as fire or flood.

You are subject to this rule if you are an owner or operator of a regulated SI internal combustion engine that was manufactured after July 1, 2008.

Compliance information

If you are an owner or operator of a stationary SI internal combustion engine that is manufactured after July 1, 2008, and must comply with the emission standards specified in §60.4233(a) through (c), you must comply by purchasing an engine certified to the emission standards in §60.4231(a) through (c), as applicable, for the same engine class and maximum engine power. In addition, you must meet one of the requirements:

• If you operate and maintain the certified stationary SI internal combustion engine and control device according to the manufacturer's emission-related written instructions, you must keep records of conducted maintenance to demonstrate compliance, but no performance testing is required if you are an owner or operator. You must also meet the requirements as specified in 40 CFR part 1068, subparts A through D, as they apply to you. If you adjust engine settings according to and consistent with the manufacturer's instructions, your stationary SI internal combustion engine will not be considered out of compliance.

• If you do not operate and maintain the certified stationary SI internal combustion engine and control device according to the manufacturer's emission-related written instructions, your engine will be considered a non-certified engine, and you must demonstrate compliance by following specified instructions.

More information

US EPA. Rule summary, rule history, compliance information and links to additional resources.

US EPA. Compliance Requirements for Stationary Engines.