Compressor Types

Rotary Vane Compressors

Flooded Screw Compressors

Reciprocating Compressors

Rotary Vane Compressor compressor02.jpg Reciprocating Compressor
  • Eccentrically mounted rotor
  • Centrifugal force causes vanes to slide in or out
  • Gas is forced into decreasing space thereby causing compression
  • Jacket water cooling system
  • RPM range 400 to 1600
  • Twin helical rotors
  • Oil is both the cooling medium and the compression medium
  • Various configurations of gears, internal porting and loader/unloader valves available
  • Gas mixed with oil. Must be separated after compression
  • Piston/cylinder arrangement
  • May be air, water or oil cooled
  • Ages old technology
  • May be slow speed or high speed
  • Not typically used for Vapor Recovery

Typical Operating Parameters:

  • Differential pressure of 60 psig or less (for single-stage units)
  • Volume from approximately 15 MSCFD to 2 MMSCFD (for single-stage units)
  • Relatively low suction temperatures (< 120° F)

Typical Operating Parameters:

  • Differential pressure of 300 psig or less (for single-stage units)
  • Volume from approximately 20 MSCFD to 2.5 MMSCFD (for single-stage units)
  • Virtually any temperature (< 180° F)

Typical Operating Parameters:

  • Differential pressure in excess of 2000-3000 psig (for multi-stage units)
  • Volume in excess of 20 MMSCFD (dependent upon suction pressure)
  • Relatively high suction temperatures (< 200° F)

Advantages:

  • Excellent for relatively high volumes and relatively low differential pressures
  • Efficient at low pressures
  • Can handle wet gas relatively easy
  • Comparatively low initial cost and ongoing maintenance

Advantages:

  • Excellent in a large volume/medium differential pressure range
  • Can handle wet gas better than rotary vanes
  • Excellent temperature control for controlling condensate fallout

Advantages:

  • High volume/high pressure

Disadvantages:

  • Limited as to discharge pressure
  • Limited as to suction temperature capabilities
  • Free liquid causes blade breakage problems

Disadvantages:

  • Higher maintenance
  • Higher operational expense (oil, filters, etc.)

Disadvantages:

  • Low suction pressure results in large first stage cylinder size
  • Inefficient at low pressures
  • Rings and valves fail in wet gas applications
  • Control is difficult at atmospheric pressures
  • Not recommended for Vapor Recovery Service

Typical Applications:

  • Vapor Recovery
  • Low Pressure Gas Boosting
  • Digester Gas Recovery
  • Landfill Gas Recovery
  • Casinghead Pressure Reduction

Typical Applications:

  • Vapor Recovery
  • Wellhead Compression
  • Medium Pressure Gas Boosting
  • Landfill Gas Recovery
  • Casinghead Pressure Reduction

Typical Applications:

  • Wellhead Compression
  • Gas Boosting (medium to high pressures)
  • CNG
  • Casinghead Pressure Reduction