Product Description

Rotary Screw Gas Compressor HG12

LeROI Rotary Screw Gas Compressors are very cost effective for handling high volumes of gas in field gathering, vapor recovery, and other applications. The HG12 and HGF. Series are suitable for applications to 125 BHP and 350 PSIG discharge pressure. Low maintenance and high reliability are inherent with rotary screws because they have few moving parts. There are no valves, rings or packing to wear out or cause loss of efficiency.

Smooth operation results from no unbalanced forces and no pressure pulsation. No foundation is required and there are no piping vibrations from pressure pulsation. Natural gas engine or electric motor drives are equally acceptable with rotary screws. LeROI Rotary Screw Gas Compressors are available in various models covering a flow range of 20 to 15,000 MSCFD and horsepower from 10 to 900.



The HG12000 can be belt driven or directly coupled to electric motors for maximum flexibility at minimum cost. The compressor shaft bearings can absorb the belt side
load without additional pillow block bearing supports up to 50 HP. Models HG12XXX and HGF12000 are suitable for direct coupling to engines and electric motors.

Single-Stage operation from 20 PSIG to 350 PSIG maximum is possible with the HG12 and HGF Series oil-flooded compressors. Compressor packages are therefore simple, reliable and in expensive. The gas differential pressure provides oil circulation for proper lubrication at differential pressures over 70 PSI. Optional oil pumps are available for applications with less than 70 PSI differential pressure.

Discharge porting can be selected to match the internal compression to the application requirement for maximum compression efficiency. All iron or steel construction with no copper or copper alloys makes these compressors compatible with natural gas, sweet or sour.



  • Brake Horsepower 125 Max.
  • Flow Range (MSCFD) 1,400 Max.
  • Inlet Pressure 20″ Hg Vac. Min.* 50 PSIG Max.
  • Discharge Pressure 20*–350 PSIG (MAWP)
  • Input Speed Range
    – HG12 Non-Geared 2,250/Min. 6,000/Max. RPM
    – HGF12 Non-Geared 1,500/Min. 4,000/Max. RPM
    – HG12 Geared 750/Min. 3,600/Max. RPM* Consult Factory for use with lower vacuum inlet or discharge pressures.


Technical Specifications

  • Model HG12000, HGF12000 Non-Geared & HG12XXX Geared
  • Rotor Diameter 127.5 mm (5.02 inches)
  • Rotor L/D 1.65
  • Rotor Description
    – Twin Screw SRM Profile with Sealing Strips, 4 Lobe Male, 6 Lobe Female
  • Shaft Seal(s) – Mechanical*
  • Drive System
    – HG12000 is suitable for direct coupling to electric motor or belt drive – oversized input shaft bearings for belt side load up to 50 HP. Rotation – Facing Shaft – CCW. Drive Shaft 1⅝” Dia. with ⅜” Square Key.
    – HGF12000 Female Rotor Drive, Non-Geared, Drive Shaft 1⅜” Dia. with ⅜” Square Key.
    – HG12XXX uses internal helical speed increasing gears (AGMA 11). Gear ratios of 1.2-3.1 are available. Drive Shaft 1⅝” Dia. with ⅜” Square Key. The HGF12000 Non-Geared and HG12XXX Geared are CW rotation suitable for direct coupling to engines or electric motors.
  • Materials
    – Rotors – Ductile Iron 65-45-12
    -Castings – Cast Iron G3000
    – Bearings – Roller bearings on the inlet end and tapered roller bearings on the discharge end – alloy steel races, rolling elements and cages.
  • Weight
    – HG12000 & HGF12000 Non-Geared – 330 lbs
    – HG12XXX Geared – 410 lbs



  • Gas Gathering
  • Fuel Gas Boosting
  • Inert Gas Boosting
  • Biogas
  • LNG Boil-Off Gas
  • Well Head Gas Compression
  • Vapor Recovery
  • Landfill Gas
  • Plunger Lift


Learn more about the rotary screw gas compressor on the Website of Aircom HERE.

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