Engine Emissions & EPA Requirements

Due to emission requirements set by the Environmental Protection Agency, it is important to utilize the proper type of engine for a particular gas. At eNGINES-LPG, we will match you with engine options to meet these requirements.

Our Options

eNGINES-LPG offers EPA-certified natural gas/liquid petroleum gas engines and Wellhead gas certified engines.

Clean Air Act in the National Emission Standard for Hazardous Air Pollution

The EPA has deemed that all engines must meet the standards set by the Clean Air Act. Individuals and corporations that do not adhere to these standards may be subjected to steep penalties. To meet the Clean Air standards, laboratory or site tests must be performed.

Laboratory and Site Testing

Engines installed by private owners must be site tested. The owner must go through emissions testing and submit a site application. Once approved by the EPA, the engine will be deemed as certified. Site testing is common for stationary equipment with large variations in the properties of fuel used in different locations.

Manufacturers commonly perform laboratory testing—a process that comprises testing of a prototype in a controlled laboratory environment and applying the same standards to all produced engines. These engines must be distributed with literature that describes requirements for installation. If the BTU of the gas used in the engine matches laboratory standards, then approval will be granted by the EPA. Upon EPA approval, all engines of a particular type that are laboratory-tested are considered certified.

Rates of Gas in Laboratory Testing

Because of the consistency of gas in manufactured engines, laboratory testing requires gases to be tested at particular rates.

Natural Gas

The rate of natural gas in laboratory tests ranges from 900 BTU to 1,050 BTU with an average of 1,020. At the standard temperature and pressure required in laboratory testing, methane (the primary component of natural gas) is about 1,010 BTU/cf.

Liquefied Petroleum Gas (LPG) or Propane

LPG and propane have a rate of 1,800 BTU to 2,500 BTU in a laboratory setting. This variation is largely attributed to differences in gas content. Pure ethane burns at about 1,770 BTU/cf, while pure propane burns at 2,516 BTU/cf.

Wellhead Gas

Wellhead gas can range from 900 BTU to 2,500 BTU. eNGINE-LPG offers lab-certified Wellhead engines that can handle 1,000–2,500 BTU. For landfill gas, or fuels with very low heat contents, our engines also can operate at 800 BTU–1,000 BTU. These low-BTU engines also are lab tested for an alternative certification.