Two inspectors analyze the Downstream Oil Refinery Rig
Downstream Overview

The downstream oil and gas industry sector pertains to the refining and processing of oil and natural gas into usable products including fuels, lubricants, and petrochemicals such as fertilizers, rubbers, and polymers. The downstream market also includes hydrogen production and chemical manufacturing.




Industrial Gases


Ariel Compressors are used in a number of other critical services, including:

  • Hydrogen Makeup and Recycle
  • Feed Gas
  • Hydrogen Production
  • SynGas (HYCO)
  • Hydrotreating
  • Hydrocracking
  • Chemical processing
  • Isomerization
  • Offgas
  • Hydrogen Storage
  • Fuel Gas
  • RFG

Process, Refining & Chemical Compressors

Ariel's wide range of short-stroke, medium-speed reciprocating compressors utilize unlined and non-cooled compressor cylinder technology, representing the latest technology of reciprocating compressors and are the 21st-century reciprocating compressors for downstream applications.


API 618 Compressor Features


Designed in accordance with API 618 standards for critical process applications, Ariel’s process reciprocating compressors utilize field-proven, pre-designed components to provide the highest reliability and availability. This allows them to meet or exceed API 618 requirements for three years of uninterrupted service. Ariel’s approach to design and manufacturing takes advantage of standardized core components – allowing for full configuration on unique project requirements. 

  • API 618 Type C long two compartment distance pieces
  • Precision tri-metal half shell bearings for crankshaft main and crankpin bearings
  • Heavy-duty, forged steel crankshaft, precision machined with integral counterweights
  • Horizontal balanced opposed throws
  • One-piece ductile iron crossheads with direct full pressure lubrication at top and bottom for minimum wear
  • Forged steel connecting rods.


Ariel’s moderate-speed process compressors operate in comparable piston speed ranges to long-stroke, slow-speed compressors. Ariel’s extensive product line supports a wide range of process applications.



Ariel's comprehensive line of moderate speed, reciprocating process compressors combine more than 40 years of research and development with the use of advanced design tools, field-proven installations and on-site experience. Ariel’s wide range of process compressors are designed to achieve or exceed three years of uninterrupted service, while meeting the most demanding industry requirements.

Frame Stroke Piston Speed RPM
3 450 900
JGJ 3.5 525 900
JGT 4.5 540 720
JGF 5.0 600 720
KBT 5.0 600 720
JGK 5.5 660 720
JGD 5.5 660 720
KBU 5.75 690 720
KBK 6.0 720 720
KBB 7.25 725 600
Compressor packaged for process service
Icon of tubes and bottles
15 + Years Producing durable process compressors
Cylinder to Frame Combinations
31 compressor models suited for process service

Process Cylinder Design Features


  • Wearbands to meet 5 psi bearing pressure for both lubricated and non-lubricated services
  • Indicator connections
  • Purged packing cases
  • Water cooled packing cases
  • Application-specific valve design
  • Application-specific non-metallic wear materials
  • O-ring sealed valve covers
  • Capacity and Load Control devices available
  • Hardened 4100 series alloy steel piston rods
  • 17-4 PH stainless steel and tungsten carbide coated piston rods available as options
  • Cylinder bores hardened to greater than 50 Rockwell C
  • Lubricated and non-lubricated applications

Explore More Compressor Applications




Ariel provides high-value reciprocating compressors to enhance oil production, gather natural gas, or capture bio-methane gases.



Ariel compressors manufactured for processing, pipeline, and storage applications, deliver high-efficiency.

CNG For Vehicle Fueling


Ariel offers a product line of fast-fill CNG compressors for public and private fueling stations.

Ariel Compressors


Ariel compressors run longer and provide maximum reliability in the field.