BAUER GRU® SERIES
The BAUER GRU® Biogas Compressor range has been specifically designed for feeding biogas upgrading systems. The function of the biogas recovery compressor is to elevate the pressure of the incoming biogas from 1-7 psig (typical) to 90-230 psig, which is the operating pressure requirement for most PSA/membrane type gas upgrading systems. BAUER offers a complete GRU system size range from 10 HP to 750 HP (7.5-560 kW).
At the heart of every GRU compressor system is the legendary BAUER Rotorcomp® rotary screw compressor, which is world-renowned for exceptional durability and reliability. The sophisticated control system in the GRU senses pressure upstream of the unit, and automatically adjusts the compressor speed to modulate compressor output based on the availability of biogas from the source (landfill or digester). If there is an insufficient amount of gas available upstream for compression, the system automatically goes into standby mode for instantaneous compression capability when upstream gas pressure suddenly increases. This significantly reduces the occurrences of venting gas into the atmosphere, because the compressor is ready to operate instantaneously (instead of ramping up through normal start-up sequences after being completely shut down).

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THE MOST COMPREHENSIVE SIZE AND PERFORMANCE RANGE IN THE INDUSTRY
Bauer offers many sizes and models of pre-engineered biogas compressors ranging from 15 to 350 hp (11 to 260 kW). This allows Bauer to size the compressor system specific to the performance needs of each project.
- Inlet pressure range: 0.1 to 35 psig (0.007 to 2.41 barG)
- Horsepower range: 5 to 350 hp (3.7 to 260 kW)
- Biogas Flow Rate: 10 to 1728 scfm (17 to 2773 Nm3/hr)
- Final Pressure: 100 to 232 psig (6.9 to 16 barg)
AVAILABLE OPTIONS
- Gas inlet particulate filter
- Gas aftercooler (air-cooled)
- Sound attenuation
- Heat recovery
- Cold weather package
- 575 Volt drive equipment for Canada
STANDARD SCOPE OF SUPPLY
- Heavy-duty rotary screw compressor manufactured by BAUER's Rotocomp® division at the heart of the system
- Variable speed control of compressor to modulate the flow of biogas based on the incoming supply of gas (VF drive located remotely from skid as defined by Class 1, Div 2 code requirements per NEC NFPA 70, Article 500)
- Heavy-duty TEFC electric motor
- Stainless steel construction of piping and major P&ID components
- PLC control of all major system components with on board HMI
- BAUER CONNECT® remote telemetry IoT with Modbus TCP/IP or Profinet connection capability
- Fully integrated system built on a heavy-duty steel skid, designed for plug and play installation
- Pressure Sensors, Temperature Transmitters, Gauges, and Valves
- Air-cooled oil cooler w/ TEFC motor and controlled by VFD for efficient oil temperature control
- Stainless Steel Oil / Gas separator w/ Pressure Safety Valve