• JG & JGA Reciprocating Gas Compressors

    The JG and JGA are medium-sized, driver-rated separable reciprocating compressors utilized in gas gathering, fuel-gas boosting, underbalanced drilling and CNG applications.

    Size Comparison
     

  • Product Features

  • Slider_Aux_End_MNPQ_300_260

    Full-Pressure Lubrication

    A frame-driven lube oil pump provides cooled oil through a full-flow oil filter to all moving parts in the frame. A divider-block system supplies metered oil to cylinder bores and rod packings.

    Slider_Bolting_Grade8_300_260

    High-Strength Bolting

    Durable Grade 8 bolting on all loaded joints combined with specially designed fatigue-fighting bolts on all valve caps ensure ultimate strength.

    Slider_Conrod_MNPQ_300_260

    Rigid Connecting Rods

    The JGA/JG compressors feature durable connecting rods manufactured from forged steel with a 4-bolt heavy-duty "I" section.

       
      Slider_Crosshead_MNPQ_300_260

      Rugged Crossheads

      One-piece, long-life crossheads with hardened, ground steel crosshead pins and direct, full-pressure lubrication at the top and bottom for minimum wear.

      Slider_cylinder_300_260

      Innovative Cylinders

      Ariel's horizontal and double-acting cylinders eliminate the cost of a cylinder cooling system and remove the maintenance problems associated with water cooling.

      Slider_piston_rod_300_260

      Durable Pistons and Rods

      JGA/JG compressors feature wear-resistant ductile or gray iron pistons and precision-ground alloy steel piston rods with locking crosshead nuts. Rolled threads are 1/4" under rod diameter for easy installation.

      Slider_Bearings_MNPQ_300_260

      Precision Bearing Shells

      Every Ariel compressor features precision-machined compact tri-metal main and connecting rod bearings..

       
      Slider_VVCP_300_260

      Versatile Unloading Devices

      Ariel offers manual, head-end variable volume clearance pockets on most cylinders. Pneumatic suction valve un-loaders are available on a limited basis.
       
      Slider_Valve_MNPQGAJRHEKT_300_260

      Efficient Valving

      Plate-type valves are designed for modern speeds, utilizing non-metallic sealing elements as standard. Valves are selected to comply with established low-valve velocity standards.

       

      Slider_crankshaft_300_260

      Heavy-Duty Crankshafts

      The JGA/JG compressors feature forged steel, precision-machined crankshafts with integral counter-weights manufactured by Ariel Corporation.

       
      Slider_spin_on_filter_300_260

      High-Efficiency Spin-On Oil Filters

      Ariel JGA/JG compressors feature high-efficiency spin-on oil filters rated at 5 micron nominal and 17 micron absolute.

       

      Slider_Frame_ALL_Frames_300_260

      Rugged Crankcase

      Ariel crankcases are designed for long service life and ease of access during maintenance and feature heavily-ribbed, high-strength cast iron base with removable lightweight aluminum top cover.

    • Full-Pressure Lubrication

      A frame-driven lube oil pump provides cooled oil through a full-flow oil filter to all moving parts in the frame. A divider-block system supplies metered oil to cylinder bores and rod packings.



      High-Strength Bolting

      Durable Grade 8 bolting on all loaded joints combined with specially designed fatigue-fighting bolts on all valve caps ensure ultimate strength.



      Rigid Connecting Rods

      This compressor features durable connecting rods manufactured from ductile iron with a 4-bolt heavy-duty "I" section.



      Rugged Crossheads

      One-piece, long-life crossheads with hardened, ground steel crosshead pins and direct, full-pressure lubrication at the top and bottom for minimum wear.



      Innovative Cylinders

      Ariel's horizontal and double-acting cylinders eliminate the cost of a cylinder cooling system and remove the maintenance problems associated with water cooling.



      Durable Pistons and Rods

      This compressors features wear-resistant ductile or gray iron pistons and precision-ground alloy steel piston rods with locking crosshead nuts. Rolled threads are 1/4" under rod diameter for easy installation.



      Precision Bearing Shells

      Every Ariel compressor features precision-machined compact tri-metal main and connecting rod bearings.



      Versatile Unloading Devices

      Ariel offers manual, head-end variable volume clearance pockets on most cylinders. Pneumatic suction valve un-loaders are available on a limited basis.



      Efficient Valving

      Plate-type valves are designed for modern speeds, utilizing non-metallic sealing elements as standard. Valves are selected to comply with established low-valve velocity standards.



      Heavy-Duty Crankshafts

      Ariel manufactured crankshafts are precision-machined one-piece forged steel with integral counter-weights, balanced for smooth operation.



      High-Efficiency Spin-On Oil Filters

      This compressor features high-efficiency spin-on oil filters rated at 5 micron nominal and 17 micron absolute.



      Rugged Crankcase

      Ariel crankcases are designed for long service life and ease of access during maintenance and feature heavily-ribbed, high-strength cast iron base with removable lightweight aluminum top cover.




    • Specifications

    • Frame JG JGA
      JG/2 JG/4 JGA/2 JGA/4 JGA/6
      Number of Throws 2 4 2 4 6
      Rated Power (BHP) 252 504 280 560 840
      Stroke (inch) 3.5 3.0
      Maximum RPM 1,500 1,800
      Piston Speed (FPM) 875 900
      Total rod Load (lbs) 18,000 20,000
      Tension (lbs) 9,000 10,000
      Compression (lbs) 10,000 11,000
      Average Weight without Cylinders (lbs) 900 1,700 900 1,700 3,800
      Maximum Length (inch) 33 58 33 58 86
      Nominal Width (inch) 80
      Crankshaft Centerline, from bottom (inch) 10.25
      Frame JG JGA
      JG/2 JG/4 JGA/2 JGA/4 JGA/6
      Number of Throws 2 4 2 4 6
      Rated Power (kW) 188 376 209 418 626
      Stroke (mm) 89 76
      Maximum RPM 1,500 1,800
      Piston Speed (m/s) 4.45 4.57
      Total rod Load (N) 80,068 88,964
      Tension (N) 40,034 44,482
      Compression (N) 44,482 48,930
      Average Weight without Cylinders (kg) 408 771 408 771 1,724
      Maximum Length (mm) 838 1,473 838 1,473 2,184
      Nominal Width (mm) 2,032
      Crankshaft Centerline, from bottom (mm) 260
       
      JG
      JGA
      Number of Throws
      2 | 4
      2 | 4 | 6
      Stroke
      3.50 in
      3.00 in
      89 mm
      76 mm
      Rated RPM
      1,500
      1,800
      Rated Power/Throw
      126 BHP
      140 BHP
      94 kW
      104 kW

      Internal Gas Rod Loads

      Compression
      10,000 lbf
      11,000 lbf
      44.5 kN
      48.9 kN
      Tension
      9,000 lbf
      10,000 lbf
      40.0 kN
      44.5 kN
      Total
      18,000 lbf
      20,000 lbf
      80.1 kN
      89.0 kN

      Miscellaneous

      Rod Diameter
      1.125 in
      29 mm
      Crankshaft Centerline
      8.250 in
      210 mm
      Main Diameter
      3.250 in
      83 mm
      Guide Design
      Separable

      Material

      Crankshaft
      Forged Steel
      Connecting Rod
      Forged Steel
      Crosshead
      Ductile Iron
      Crosshead Bushing
      Bronze

    • Materials

    • Small Frame Montage
      Crankcase

      Crankcase

      Small Frame Crosshead
      Crosshead

      Crosshead

      Small Frame ConRod
      Connecting Rod

      Connecting Rod

    • Part Material
      Crankcase Gray Iron
      Crosshead Ductile Iron
      Crankshaft Forged Steel
      Connecting Rod Forged Steel
      Main Bearing Tri-Metal
      Thrust Bearing Bronze
      Connecting Rod Bearing Tri-Metal
      Crosshead Guide Gray Iron
      Crosshead Pin Alloy Steel
      Crosshead Pin Bushing Bronze
      Stress Bolts, Standard Grade 8

    • Cylinders

      Cylinders

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      •  
      •  
      •  
      •  
      •  
       

      Innovative Cylinders

      The proven design of the Ariel cylinder eliminates the cost of a cylinder cooling system and removes the complexity and maintenance problems associated with water cooling, such as scaling and corrosion.

      • Horizontal single or double-acting, ion-nitrided, non-cooled compressor cylinders
      • Plugged indicator connections on the head end and crank end
      • SAE series 4100 steel piston rods, ion-nitrided with rolled threads
      • Pistons of wear-resistant gray iron or ductile iron
      • Non-metallic piston and rider rings
      • Full floating, vented rod and wiper packings
      • Non-metallic plates in suction and discharge valves
       
    • Drag the sliders to narrow cylinder choices

      Bore
       
      Pressure
       
      Operation Class BORE (inch) MAWP (psig) Material
      Double-Acting 1-3/4M-FS 1.625; 1.750 3,500 Forged Alloy Steel
      Double-Acting 2-3/4M 2.500; 2.750 1,880 Ductile Iron
      Double-Acting 3M 3.000 1,190 Ductile Iron
      Double-Acting 3-1/2M 3.250; 3.500 1,050 Ductile Iron
      Double-Acting 4-1/8M 3.875; 4.125 750 Ductile Iron
      Double-Acting 5-1/8M 4.750; 5.125 500 Ductile Iron
      Double-Acting 5-3/4M 5.500; 5.750 480 Ductile Iron
      Double-Acting 6-1/2M 6.125; 6.500 275 Ductile Iron
      Double-Acting 8M 7.500; 8.000 175 Ductile Iron
      Double-Acting 3JG 2.750; 3.000 2,550 Ductile Iron
      Double-Acting 3-5/8JG 3.375; 3.625 1,270 Ductile Iron
      Double-Acting 3-5/8JG 3.375; 3.625 1,640 Ductile Iron
      Double-Acting 4-1/8JG 3.875; 4.125 1,270 Gray Iron
      Double-Acting 5-1/8JG 4.750; 5.125 865 Gray Iron
      Double-Acting 6-1/2JG 6.125; 6.500 635 Ductile Iron
      Double-Acting 7-1/2JG 7.125; 7.500 600 Ductile Iron
      Double-Acting 8-7/8JG 8.500; 8.875 375 Gray Iron
      Double-Acting 11JG 10.500; 11.000 150 Gray Iron
      Double-Acting 13-1/2JG 13.000; 13.500 115 Gray Iron
      Tandem 2-1/4P-CE 2.063; 2.250 1,500 Ductile Iron
      Tandem 2-3/4P-CE 2.500; 2.750 1,500 Ductile Iron
      Tandem 3-1/4P-CE 3.000; 3.250 1,125 Ductile Iron
      Tandem 3-1/4P-CE 3.000; 3.250 1,800 Ductile Iron
      Tandem 4-3/8P-HE 4.125; 4.375 1,270 Ductile Iron
      Tandem 5-1/8P-HE 4.750; 5.125 635 Ductile Iron
      Tandem 5-1/8P-HE 4.750; 5.125 1,200 Ductile Iron
      Tandem 5-3/4P-HE 5.500; 5.750 575 Ductile Iron
      Tandem 3-3/4SP-CE 3.500; 3.750 1,265 Ductile Iron
      Tandem 4-3/8SP-CE 4.125; 4.375 935 Ductile Iron
      Tandem 6-1/2SP-HE 6.125; 6.500 600 Ductile Iron
      Tandem 8SP-HE 7.500; 8.000 440 Ductile Iron
      Tandem 1-3/4SG-FS-HE 1.250; 1.500; 1.625; 1.750 6,100 Forged Alloy Steel
      Tandem 1-1/2SG12-FS-HE 1.250;1.500 9000 Forged Alloy Steel
      Tandem 2-1/2SG-FS-HE 2.000; 2.250; 2.500 5,000 Forged Alloy Steel
      Tandem 3SG-CE 2.750; 3.000 2,550 Ductile Iron
      Tandem 3SG-CE 2.750; 3.000 3,000 Ductile Iron
       Tandem     3SG11-FS-CE 2.750; 3.000 5,000 Ductile Iron
      Tandem 3JG-HE 2.750; 3.000 2,200 Ductile Iron
      Tandem 3-5/8SG-CE 3.375; 3.625 2,550 Ductile Iron
      Tandem 3-5/8SG-CE 3.375; 3.625 3,000 Ductile Iron
      Tandem 3-5/8JG-HE 3.375; 3.625 1,270 Ductile Iron
      Tandem 4-1/8JG-HE 3.875; 4.125 1,125 Ductile Iron
      Tandem 3-3/4SG-CE 3.750 2550 Ductile Iron
      Tandem 5-1/8JG-CE 4.750; 5.125 865 Gray Iron
      Tandem 6-1/2JG-CE 6.125; 6.500 635 Ductile Iron
      Tandem 8-7/8JG-CE 8.500; 8.875 375 Gray Iron
      Bore
       
      Pressure
       
      Operation Class BORE (mm) MAWP (bar) Material
      Double-Acting 1-3/4M-FS 41; 44 241 Forged Alloy Steel
      Double-Acting 2-3/4M 64; 70 130 Ductile Iron
      Double-Acting 3M 76 82 Ductile Iron
      Double-Acting 3-1/2M 83; 89 72 Ductile Iron
      Double-Acting 4-1/8M 98; 105 52 Ductile Iron
      Double-Acting 5-1/8M 121; 130 34 Ductile Iron
      Double-Acting 5-3/4M 140; 146 33 Ductile Iron
      Double-Acting 6-1/2M 156; 165 19 Ductile Iron
      Double-Acting 8M 191; 203 12 Ductile Iron
      Double-Acting 3JG 70; 76 176 Ductile Iron
      Double-Acting 3-5/8JG 86; 92 88 Ductile Iron
      Double-Acting 3-5/8JG 86; 92 113 Ductile Iron
      Double-Acting 4-1/8JG 98; 105 88 Gray Iron
      Double-Acting 5-1/8JG 121; 130 60 Gray Iron
      Double-Acting 6-1/2JG 156; 165 44 Ductile Iron
      Double-Acting 7-1/2JG 181; 190 41 Ductile Iron
      Double-Acting 8-7/8JG 216; 225 26 Gray Iron
      Double-Acting 11JG 267; 279 10 Gray Iron
      Double-Acting 13-1/2JG 330; 343 8 Gray Iron
      Tandem 2-1/4P-CE 52; 57 103 Ductile Iron
      Tandem 2-3/4P-CE 64; 70 103 Ductile Iron
      Tandem 3-1/4P-CE 76; 83 78 Ductile Iron
      Tandem 3-1/4P-CE 76; 83 124 Ductile Iron
      Tandem 4-3/8P-HE 105; 111 88 Ductile Iron
      Tandem 5-1/8P-HE 121; 130 44 Ductile Iron
      Tandem 5-1/8P-HE 121; 130 83 Ductile Iron
      Tandem 5-3/4P-HE 140; 146 40 Ductile Iron
      Tandem 3-3/4SP-CE 89; 95 87 Ductile Iron
      Tandem 4-3/8SP-CE 105; 111 64 Ductile Iron
      Tandem 6-1/2SP-HE 156; 165 41 Ductile Iron
      Tandem 8SP-HE 191; 203 30 Ductile Iron
      Tandem 1-3/4SG-FS-HE 32; 38; 41; 44 421 Forged Alloy Steel
      Tandem 1-1/2SG12-FS-HE 32;38 564 Forged Alloy Steel
      Tandem 2-1/2SG-FS-HE 51; 57; 64 345 Forged Alloy Steel
      Tandem 3SG-CE 70; 76 176 Ductile Iron
      Tandem 3SG-CE 70; 76 207 Ductile Iron
      Tandem 3SG11-FS-CE 70;76 345 Ductile Iron
      Tandem 3JG-HE 70; 76 152 Ductile Iron
      Tandem 3-5/8SG-CE 86; 92 176 Ductile Iron
      Tandem 3-5/8SG-CE 86; 92 207 Ductile Iron
      Tandem 3-5/8JG-HE 86; 92 88 Ductile Iron
      Tandem 4-1/8JG-HE 98; 105 78 Ductile Iron
      Tandem 3-3/4SG-CE 95 176 Gray Iron
      Tandem 5-1/8JG-CE 121; 130 60 Gray Iron
      Tandem 6-1/2JG-CE 156; 165 44 Ductile Iron
      Tandem 8-7/8JG-CE 216; 225 26 Gray Iron

    • Parts

      Ariel original equipment parts


    • Genuine Ariel Parts

      Ariel original equipment parts are designed, engineered, and manufactured specifically for your JG or JGAJGC or JGDJGE, JGK, or JGTJGJJGHJGM or JGPJGN or JGQJGRKBV or KBBKBZ or KBU compressor. Discover why Ariel's comprehensive parts program will maximize the life of your compressor.

      Explore Ariel Parts

      Trusted Ariel Distributors

      Ariel OEM parts are marketed through a long-established network of qualified distributors who have unmatched expertise in the compression industry. Our distributors are available to help you select the best parts and services required to maintain the efficiency and dependability of your Ariel compressor.

      Find A Distributor


    • Support

      Ariel is committed to supporting our compressors for life. We pride ourselves on the manufacturing practices and engineering support behind our world class compression technologies. Through unmatched customer service and a global distribution network, Ariel will provide you with best-in-class compression solutions that reduce downtime and improve application performance.