Compressor Station Emissions Reduction

Compressor Station Emissions Reduction


Due to recent EPA rulings, many natural gas transmission compressor station
operators have recognized the need to enhance their assets to reduce
emissions. Companies have weighed the cost of purchasing and installing new
units against upgrading existing facilities. At times, these companies have
found it more economical and less time consuming to perform the upgrades.

EN Engineering has extensive experience with compressor stations, including
the design and coordination of the installation of emission reduction
systems, as well as the associated facility modifications.

Clean Burn of Reciprocating Units

EN Engineering’s team of compressor experts coordinate with equipment
vendors to perform the on skid upgrades. The units typically require
upgrades to turbo systems, reducing the amount of emissions in the exhaust
stream. Modifications to these units include:

Selective Catalytic Reduction (SCR)

Our engineering professionals have completed a number of projects, including
the installation of various SCR systems on legacy turbine-centrifugal
packages. These systems utilize various forms of ammonia injection to reduce
exhaust stream emissions. EN Engineering design services encompass the
installation of components for the SCR systems associated with the existing
unit, such as:

  • Ammonia tanks, loading and unloading skids, pumps skids, buildings, and
    detection systems
  • Ammonia vaporizer skids including metering, safety facilities, power and
  • Integration of system control and monitoring, including Continuous
    Emissions Monitoring Systems (CEMS), with existing station control system
    and gas control facility monitoring

Dry Seal Gas Conversions

EPA rulings have dictated that existing wet seal system emissions on
centrifugal packages be reduced by 95 percent. Typically, flaring and
reprocessing of the fugitive emissions is less advantageous than installing
a dry seal gas system. Our experienced engineering professionals have
completed numerous conversions with the installation of new dry gas seal
panels, electric and pneumatic booster pumps, and integration of new and
existing seal transmitters into the unit and station control systems

Auxiliary System Analysis and Modifications

EN Engineering will complete all necessary upgrades and modification designs
related to associated auxiliary systems affected by the emissions reduction

  • Air system upgrades, new air compressor packages, dryers, reservoirs,
    control, and sequencing
  • Cooling water and oil upgrades via cooler additions, pump systems, control
    and power systems
  • Fuel gas system upgrades with metering, regulation, and heating
  • Upgraded oil and water cooling systems
  • New intake and exhaust stacks and foundation support systems
  • Enhanced fuel gas systems with ultrasonic metering

Engineering and Design Integration

EN Engineering offers a full complement of engineering and design
capabilities in order to upgrade existing facilities to meet ever-increasing
EPA emissions regulations. EN Engineering team members are experts in:

  • Foundation design, including all types of deep foundations and within
    challenging environments
  • Mechanical piping and equipment specifications, as well as the design for
    all types of emissions-related materials and facilities
  • Instrumentation and monitoring equipment modifications
  • Emissions reduction upgrades integration into existing unit and station
    control systems


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