1. A. Applicability. This chapter applies to stationary internal combustion engines used to compress natural gas located at natural gas pipeline compression stations.

2. B. NO_x Emission Limits. A person who owns or operates a stationary internal combustion engine to which this chapter applies shall perform either parametric optimization or engine rebuild to meet the following NO_x emission limits:

   1. (1) Facilities with five or fewer internal combustion engines shall meet a combined maximum hourly emission limit of 300 pounds per hour or less.
   2. (2) Facilities with more than five engines shall meet a combined maximum hourly emission limit of 566 pounds per hour or less.

3. C. NO_x Emission Rates.

   1. (1) The NO_x emission rates in §C(2) of this regulation apply to a stationary internal combustion engine used to compress natural gas at a natural gas pipeline compression station if the engine is one of the types and corresponding sizes identified in §C(2) of this regulation.

   2. (2) Emission Rates.

      Type Engine	Size (Brake HP)	NOx Emission Rate (15 Percent Oxygen)
      Spark ignited rich burn	2400 HP or greater	110 ppmv
      Spark ignited lean burn	2400 HP or greater	125 ppmv
      Diesel engines	3100 HP or greater	175 ppmv
      Dual fuel engines	4400 HP or greater	125 ppmv

   3. (3) The NO_x emission rates in §C(2) of this regulation shall apply on and after May 1, 2003.

Authority: Environment Article, §§1-101, 1-404, 2-101—2-103, and 2-301—2-303, Annotated Code of Maryland

Effective date: May 1, 2000 (27:8 Md. R. 799)

Regulation .09 amended effective November 24, 2003 (30:23 Md. R. 1654)

Regulations .01—.15 repealed and new Regulations .01—.05 adopted as an emergency provision effective January 1, 2010 (37:4 Md. R. 336); adopted permanently effective May 31, 2010 (37:11 Md. R. 766)

Regulations .01—.05 under NO_x Reduction Requirements for Non-Electric Generating Units, repealed and new Regulations .01—.05 under Control of NO_x Emissions from Natural Gas Pipeline Compression Stations, adopted effective July 20, 2015 (42:14 Md. R. 885)