12 June 2010

The US Environmental Protection Agency (EPA) proposed amendments to emission standards, known as New Source Performance Standards (NSPS), for certain categories of stationary diesel and gas-fired engines. The standards for stationary diesel engines were originally adopted in July 2006 and those for SI stationary engines in January 2008.

The proposal would revise emission limits for NOx, PM, and HC from large stationary diesel engines. Specifically standards for compression ignition engines with a displacement of 10 to 30 liters per cylinder would be strengthened to the same levels required by EPA regulations for similar size marine diesel engines.

The proposed amendments also would revise the standards for large stationary compression ignition engines with a displacement greater than 30 liters per cylinder in order to align them with standards for similar marine engines.

The EPA also proposed:

  • revisions to the compliance requirements to provide greater flexibility to engine owners and operators;
  • minor revisions to the standards for stationary engines located in areas of Alaska not served by the Federal Aid Highway System; and,
  • minor revisions to the standards of performance for new stationary spark ignition internal combustion engines to mirror certain revisions proposed for compression ignition engines.

EPA will accept comments on the proposed amendments for 60 days after publication in the Federal Register.

Source: US EPA