Gas compressor unit JGA

piston

Overview
The JG and JGA are medium-sized, driver-mounted separable reciprocating compressors used for gas gathering, fuel-gas boosting, underbalanced drilling and CNG service. Introduced in 1966, the JG was Ariel's initial small-frame reciprocating compressor; early frames included JG/2 and JG/4. The JGA version adds gas-lift capabilities for higher shale-well production.

Product Configurations (throws)
Available configurations: 2 Throw, 4 Throw, 6 Throw (JGA available in 6-throw).

Performance Tables — 2 Throw
Rated Power: JG 252 / JGA 280
Stroke (in): JG 3.5 / JGA 3.0
Max RPM: JG 1,500 / JGA 1,800
Piston Speed: JG 875 / JGA 900
Rod Diameter (in): 1.125
Total Rod Load (lbs): JG 18,000 / JGA 20,000
Tension (lbs): JG 9,000 / JGA 10,000
Compression (lbs): JG 10,000 / JGA 11,000
Average Weight (lbs): JG 2,200 / JGA 2,200
Max Length (in): 34 / 34
Nominal Width (in): 80 / 80
Crankshaft Centerline (in): 10.25 / 10.25

Performance Tables — 4 Throw
Rated Power: JG 504 / JGA 560
Stroke (in): JG 3.5 / JGA 3.0
Max RPM: JG 1,500 / JGA 1,800
Piston Speed: JG 875 / JGA 900
Rod Diameter (in): 1.125
Total Rod Load (lbs): JG 18,000 / JGA 20,000
Tension (lbs): JG 9,000 / JGA 10,000
Compression (lbs): JG 10,000 / JGA 11,000
Average Weight (lbs): JG 4,200 / JGA 4,200
Max Length (in): 58 / 58
Nominal Width (in): 80 / 80
Crankshaft Centerline (in): 10.25 / 10.25

Performance Tables — 6 Throw (JGA)
Rated Power: JGA 840
Stroke (in): JGA 3.0
Max RPM: JGA 1,800
Piston Speed: JGA 900
Rod Diameter (in): 1.125
Total Rod Load (lbs): JGA 20,000
Tension (lbs): JGA 10,000
Compression (lbs): JGA 11,000
Average Weight (lbs): JGA 7,600
Max Length (in): 86
Nominal Width (in): 80
Crankshaft Centerline (in): 10.25

Product Features

• Rugged crankcase: Heavily-ribbed, high-strength cast-iron base with a removable lightweight aluminum top cover for long service life and easy maintenance access.
• High-efficiency oil filters: Non-bypassing spin-on oil filters rated at 5-micron nominal and 17-micron absolute.
• Durable pistons and rods: Wear-resistant steel or gray-iron pistons and precision-ground alloy-steel piston rods with locking crosshead nuts; rolled threads are 1/4" under rod diameter for easier installation.
• Innovative cylinders: Versatile cylinder designs usable across a wide pressure range; cylinders can be combined in many configurations. Ariel 7 performance software is used to model and design configurations.

Materials

• Gray iron crankcase: Forged steel crankshaft, gray iron crosshead guide, tri-metal main bearing.
• Ductile iron crosshead: Alloy-steel crosshead pin.
• Forged steel connecting rod: Bronze crosshead pin bushing, tri-metal connecting rod bearing, grade 8 stress bolts.

Additional Notes
Separable reciprocating design suitable for gas gathering, fuel-gas boosting, underbalanced drilling and CNG. JG is the longstanding small-frame product introduced in 1966; JGA provides modern gas-lift capability for increased shale-well production.

Technical Characteristics / Specifications

• Configurations available: 2 Throw, 4 Throw, 6 Throw.
• Rated power range (examples): JG 252–504 / JGA 280–840 (depending on throw).
• Strokes: 3.0 in and 3.5 in depending on model/throw.
• Max RPM: 1,500 (3.5" stroke) and 1,800 (3.0" stroke).
• Piston speeds shown: 875–900 (ft/min as presented).
• Rod diameter: 1.125 in.
• Total rod load up to 20,000 lbs.
• Tension/compression (lbs): up to 10,000 / 11,000 depending on model.
• Average weights (examples): ~2,200; ~4,200; ~7,600 lbs depending on throw.
• Dimensional examples: Max Length 34–86 in; Nominal Width 80 in; Crankshaft Centerline 10.25 in.
• Cylinders configurable in hundreds of combinations to meet flow and pressure requirements.