• Low Maintenance and High Reliability
  • Smooth, Quiet Operation
  • Electric Motor Driven
  • Very Effective for Handling Wet Gas

Provides Additional Profits To The Oil Producer.

Eliminate The Emission Of Stock Tank Vapors To The Atmosphere.

There are several compressor designs available to capture and compress vapors from storage tanks or vapor towers and separators. Atlas’ standard equipment incorporates the twin helical flooded rotary screw because of it’s simplicity, flexibility, and low maintenance. With a closed loop oil system for cooling, sealing, and lubrication, there is no oil reservoir drum to continuously feed the unit, as in some reciprocating compressors and rotary vane units. There are no piston rings or valves to replace when damaged by the rich gas encountered in vapor recovery. With very little carryover of oil, only infrequent additions of lube oil are required. Depending on the condition of the gas, oil and filter changes could be limited to as little as twice a year or longer, with more corrosive or contaminated gases requiring more frequent attention. Free oil analysis services will dictate frequency of required service on the oil system.
Vapor recovery duty requires sensitive monitoring of the volume of incoming gas. Atlas VRU’s incorporate the use of variable frequency drives for electric units and throttle controls on engine drive units, as well as full bypass and auto start/stop for locations with widely varying productions rates.

Vapor Recovery Applications

  • The Compressor packages are Designed with the Premise that a Vapor Recovery Compressor is Subjected to the Most Adverse Conditions of any Compressor
  • Our Compressors Target Low Pressure Vapor Recovery Applications with Inlet Pressures of 0 PSIG and Discharge Pressures up to 220 PSIG

VRU Features and Benefits

  • Maximize Return on Investment
  • Low Maintenance and High Reliability Recover Every BTU and Avoid Vapor Emissions to Atmosphere
  • Environmentally Friendly
  • Smooth, Quiet Operation
  • Compressor is Direct Coupled to the Driver
  • Wide Range of Operation
  • Easy Installation
  • Skid Mounted
  • Natural Gas Engine or Electric Motor Drive
  • Discharge Pressures up to 220 PSIG
  • Digital Instruments and Controls
  • VFD Automatically Adjusts Motor Speed

Rotary Screw Compressor

  • Very Cost-Effective for Handling High Volumes of Gas in  Vapor Recovery
  • Low Maintenance and High Reliability are Inherent 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 Pulsations
  • No Special Foundation is Required and There are no Piping Vibrations from Pressure Pulsations
  • All Iron or Steel Construction with no Copper, or Brass making these Compressors Compatible with Natural Gas, Sweet or Sour

Compressor Maintenance Comparison

When it Comes to Maintenance Costs, Rotary Screw Compressors have an Advantage Over Reciprocating Compressors. Rotary Screw Compressor Maintenance is Limited Mostly to Oil, Oil Filter, Scrubber Filter, and Separator Element Changes. Reciprocating Compressors Need Routine Maintenance Including Frequent Oil/Filter Changes, Valves, Piston Rings, and Piston Pins and Bushings


Maintenance Cost

  • Oil Change 50 Qts – 8,000 Hours  = $1,040.00
  • Oil Filter – 4,000 Hours = $70.00
  • Separator Element – 8,000 Hours = $250.00
  • Scrubber Filter – 8,000 Hours = $50.00

Annual Electricity Cost

Cost = Horsepower x 0.746 x Hours x Electricity Cost / Motor Efficiency

  • Horsepower (hp) = motor full load horsepower
  • 1 hp = 0.746 kilowatts (kW)
  • Hours = number of hours that the compressor operates
  • Electricity Cost = $/kWh (Add in demand charges and calculate average $/kWh)
  • Motor Efficiency = motor nameplate full-load efficiency 90%