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  2. 200 to 1350 hp
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  4. 10,000 hp and above

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  1. NOx
  2. NO2
  3. CO
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EPA amends standards of performance for stationary CI engines. Operators may temporarily override performance inducements in emergency situations.

July 30, 2016

On June 28, 2016, the U.S. Environmental Protection Agency (EPA) finalized amendments to the standards of performance for stationary compression ignition (CI) internal combustion engines. Regulations will go into effect 60 days are publication in the Federal Register.epa logo

EPA is finalizing these amendments to allow manufacturers to design engines so that operators can temporarily override performance inducements related to the emission control system for stationary CI internal combustion engines.

The amendments apply to engines operating during emergency situations where the operation of the engine or equipment is needed to protect human life, and to require compliance with Tier 1 emission standards during such emergencies. The EPA is also amending the standards of performance for certain stationary CI internal combustion engines located in remote areas of Alaska.

EPA’s Fact Sheet includes the following further information:

New stationary and nonroad CI engines are equipped by the engine manufacturer with emission controls to meet the Tier 4 final emission standards, which generally began with either the 2014 or 2015 model year.

  • When routine emission‐control maintenance (such as diesel exhaust fluid refill) does not occur as designed, many Tier 4 engines are designed to reduce power to prevent excess emissions.
  • The final amendments allow owners and operators to temporarily override these
    performance‐related inducements when engines are needed to respond to an emergency
    where there is a risk to human life. This will facilitate the use of stationary engines to perform
    life‐saving work during fires, floods, hurricanes, and other emergency situations.
  • The final amendments also revise the criteria in the rule for defining remote areas of Alaska,
    which is currently defined as areas that are not accessible by the Federal Aid Highway System
    (FAHS). This final rule specifies that engines in areas of Alaska that are accessible by the FAHS
    can be considered in a remote area if certain conditions are met.
  • Under the current rule, engines in remote areas of Alaska are not required to meet the most
    stringent standards for nitrogen oxides (NOx), which effectively require the use of add‐on
    emission controls. The state of Alaska provided information to EPA indicating that additional
    remote areas faced challenges that warrant allowing engines in the additional remote areas to
    meet a NOx standard that would not necessitate the use of add‐on emission controls.

What this means to you
EPA is finalizing amendments to allow manufacturers to design engines so that operators can temporarily override performance inducements related to the emission control system for stationary CI internal combustion engines operating in emergency situations.

MIRATECH can help
Contact MIRATECH to learn about emission controls for CI stationary engines.