Acid Gas Injection

  • What is Acid Gas Injection
    What is Acid Gas Injection?
    acid_gas_1
    Processed & Cleaned
    Safely Dispose
    Safely Dispose
    Compress Acidic Gas
    Compress Acidic Gas
    Injected into Disposal Wells
    Injected into Disposal Wells
  • What is Acid Gas Injection

    What is Acid Gas Injection?

    Acidic gas components can be present in some gas gathering wells. Hydrogen Sulfide (H2S) and Carbon Dioxide (CO2) are two common acidic components in raw natural gas. When these are present, the natural gas must be processed or “sweetened”, prior to use or sale.



    acid_gas_1

    Processed & Cleaned

    As natural gas is processed and cleaned, dangerous acidic gas components may be left as a byproduct.



    Safely Dispose

    Safely Dispose

    To safely dispose of these components, the low pressure, acidic gas mixture is sent to a compressor within the processing plant.



    Compress Acidic Gas

    Compress Acidic Gas

    The acid gas is compressed through 4 or 5 stages of compression.



    Injected into Disposal Wells

    Injected into Disposal Wells

    Once the acidic gas reaches cavern injection pressures of approximately 2,200 to 4,500 psi, the gas is injected into underground disposal wells.




  • Recommendations for Acid Gas Service

    Ariel offers application specific components, engineered to ensure the performance, safety, and reliability of your acid gas operation. Our recommendations for sour gas service are based upon field experience and NACE guidelines – providing innovative, safe solutions to minimize equipment corrosion often associated with CO2 and H2S contact.

    Distance Piece + Crosshead Guide

    Ariel recommends two compartment guides for sour gas service. These short and long two compartment guides offer a purge and vent system – designed to separate the frame compartment and operator atmosphere from the packing leakage and blow by, keeping the sour gas from entering the crankcase.
    *Two compartment guides are not available for the JGM: N: P: Q frames.

    Piston Rod Material

    Ariel offers 17-4PH stainless steel piston rods, chromium-nitrided in the packing travel area for acid gas service with high CO₂ and H₂S content. These heavy duty piston rods reduce the potential for corrosion.

    Purge Packing

    For proper venting, Ariel recommends the use of purge packing for services with high acidic gas components. Ariel’s purge packing blocks and directs hazardous, toxic, flammable, or corrosive gases – preventing exposure to personnel and eliminating damage to the running gear.

    Flushing Lube

    Ariel offers cylinder flushing lube for sour gas services with 100 ppm and greater H₂S content, supplying additional distribution blocks so that oil can be injected into the suction nozzle riser of the cylinder.

    17-4PH Stainless Steel Valves

    17-4PH stainless steel valves are recommended for sour gas services with 2% and greater H2S content.


  • Optional Equipment for Sour Gas Service:

    Cylinder Bolting

    Standard cylinder bolting for sweet and sour gas services consists of Grade 8 valve cap, head end head, crank end head, and packing case cap screws. 17-4PH stainless steel bolts for the valve caps, head end head, crank end head, and packing case bolting are optional.

    Cylinder Body Materials

    Standard cylinder body materials:

    ASTM A278 Grade 40 gray iron
    ASTM A536 Ductile iron 80-55-06
    ASTM A395 Ductile iron 60-40-18

    Forged Steel Cylinder Body Materials

    Ariel offers single and double acting forged steel cylinders that are suitable for H2S content due to the controlled hardness of 22 Rc maximum.

    Forged steel cylinder body materials:

    AISI 4340 Forged steel
    ASTM A668 Class J forged steel

    Separate Lube Supply:

    Sour gas service typically requires a special lubrication. Provision is made on all units to use a separate oil source for the cylinder bore and packing.