Gas Compression Engines G3520B

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Key Specs

Maximum Rating
1725 BHP
1286 bkW
NSPS Site Compliant Capable
NSPS Site Compliant Capable
Minimum Rating
1480 BHP
1104 bkW


The line of G3500B engines brings versatility, uptime, and low operating cost to your gas compression operation. They deliver the lowest engine-out emissions in the industry without sacrificing performance. Ideal applications for G3500B engines include gas lift, gas gathering, and wellhead gas compression. Cat G3520B gas engine. Ratings: 1104-1286 bkW (1480-1725 bhp) @ 1200-1400 rpm are NSPS site compliant capable.

Product Specifications for G3520B

Maximum Rating 1725 BHP 1286 bkW
Emissions NSPS Site Compliant Capable NSPS Site Compliant Capable
Minimum Rating 1480 BHP 1104 bkW
Ignition, Protection ADEM™ A3 ADEM™ A3

G3520B Standard Equipment

Air Inlet System

  • Axial Flow Air cleaner
  • Cleanable
  • Intermediate-duty with service indicator

Control System

  • ADEM A3 with integrated electronic throttle control
  • Control panel

Cooling System

  • Two-stage charge air cooling
  • Thermostats and housing
  • Engine-driven jacket and aftercooler water pump
  • Stainless steel aftercooler cores

Exhaust System

  • Dry exhaust manifolds
  • Dry exhaust elbow

Flywheels and Flywheel Housings

  • SAE No. 00 flywheel
  • SAE No. 00 flywheel housing
  • SAE standard rotation

Fuel System

  • 7-50 psi gas supply
  • Fuel system is sized for 800 to 1200 btu/scf (31.5 to 47.2 MJ/Nm3)
  • Electronic fuel metering valve
  • Gas pressure regulator
  • Gas shutoff valve (GSOV)

Ignition System

  • ADEM A3

Lubrication System

  • Crankcase breather — top mounted
  • Oil cooler
  • Oil filter — RH
  • Oil pan — 143 gal
  • Drain valve
  • Oil sampling valve
  • Turbo oil accumulator

Mounting System

  • Engine mounting rails - 330.2 mm (13 in) industrial-type

Power Take-Offs

  • Front housing — two-sided
  • Front lower LH, RH, and upper RH accessory drives


  • Paint — Cat yellow
  • Crankshaft vibration damper and guard
  • CSA Certification, Class 1 Division 2, Group D - electrical system and instrumentation - includes ADEM A3 and control panel

G3520B Optional Equipment

Air Inlet System

  • Round air inlet adaptors

Charging System

  • Charging alternator - CSA approved 24V, 65 A

Cooling System

  • Flexible connections

Exhaust System

  • Flexible fittings
  • Flange and expander

Fuel System

  • Gas filter


  • Communications module

Lubrication System

  • Lubricating oil
  • Oil bypass filter
  • Air prelube pump

Power Take-Offs

  • Front stub shaft
  • Pulleys
  • Double damper

Protection System

  • Explosion relief valves
  • Secondary GSOV

Starting System

  • Air starting motor with controls (90 psi or 150 psi)
  • API B16.3 compliant piping
  • Jacket water heater
  • Barring group


  • Special paint
  • Torsional vibration analysis

EU Certification

  • EEC DOI certification


  • Factory commissioning

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