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WEST TEXAS

COMPRESSOR

SPECIALIST

PRODUCTS

 

ROTARY VANE COMPRESSORS

 

  • 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

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)

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

Disadvantages:

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

FLOODED SCREW COMPRESSORS

 

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

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)

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

Disadvantages:

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

 

RECIPROCATING COMPRESSORS

 

  • 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 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:

  • High volume/high pressure
  • Disadvantages:
  • Low suction pressure results

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