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EmissionsNSPS Site Compliant Capable
Minimum Rating1035 BHP (772 bkW)
Ignition, ProtectionADEM™ A3
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 G3512B gas engine. Ratings: 772 bkW (1035 bhp) @ 1400 rpm are NSPS site compliant capable.


EmissionsNSPS Site Compliant Capable
Minimum Rating1035 BHP (772 bkW)
Ignition, ProtectionADEM™ A3

Benefits and Features

- Built on G3500 LE proven reliability and durability- Ability to burn a wide spectrum of gaseous fuels- Robust diesel strength design prolongs life and lowersowning and operating costs- Broad operating speed range at lower site air densities(high altitude/hot ambient temperatures)- Higher power density improves fleet management- Quality engine diagnostics- Detonation-sensitive timing control for individualcylinders

ULB technology uses an advanced control system, abetter turbo match, improved air and fuel mixing, and amore sophisticated combustion recipe to provide:- Lower environmental impact- Higher return on investment- Lower operating costs- Higher work force efficiency

- Capable of meeting U.S. EPA Spark Ignited StationaryNSPS emissions for 2010 and some non-attainmentareas- Lean air/fuel mixture provides best available emissionsand fuel efficiency for engines of this bore size

ADEM A3 engine management system integrates speedcontrol, air/fuel ratio control, and ignition/detonationcontrols into a complete engine management system.ADEM A3 has improved: user interface, display system,shutdown controls, and system diagnostics.

Large variety of factory-installed engine attachmentsreduces packaging time.

Every engine is full-load tested to ensure proper engineperformance.

GERP is a web-based program designed to provide siteperformance capabilities for Cat® natural gas enginesfor the gas compression industry. GERP providesengine data for your site's altitude, ambient temperature,fuel, engine coolant heat rejection, performance data,installation drawings, spec sheets, and pump curves.

More than 2,200 dealer outletsCat factory-trained dealer technicians service everyaspect of your petroleum engineCat parts and labor warrantyPreventive maintenance agreements available for repairbefore-failure optionsS•O•SSM program matches your oil and coolant samplesagainst Caterpillar set standards to determine:- Internal engine component condition- Presence of unwanted fluids- Presence of combustion by-products- Site-specific oil change interval

Over 60 years of natural gas engine productionOwnership of these manufacturing processes enablesCaterpillar to produce high quality, dependable products- Cast engine blocks, heads, cylinder liners, and flywheelhousings- Machine critical components- Assemble complete engine

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Standard Equipment

  • Axial flow air cleaner
  • Cleanable
  • Single element canister type with service indicator
  • ADEM A3 with integrated electronic throttle control
  • CSA certified
  • Two-stage charge air cooling
  • Thermostats and housing
  • Gear-driven jacket and aftercooler water pump
  • Stainless steel aftercooler cores
  • Dry exhaust manifolds
  • Exhaust outlet: 200 mm I.D.
  • SAE No. 00 flywheel
  • SAE No. 00 flywheel housing
  • SAE standard rotation
  • 7-50 psi gas supply
  • Electronic fuel metering valve
  • Gas pressure regulator, pivot valve operated
  • ADEM A3
  • Outdoor CSA certified
  • Crankcase breather — top mounted
  • Oil cooler
  • Oil filter — RH
  • Oil pan
  • Oil sampling valve
  • Turbo oil accumulator
  • Front housing — two-sided
  • Front lower — LH accessory drive
  • Provided through Caterpillar
  • Paint — Cat yellow
  • Crankshaft vibration damper and guard

Optional Equipment

  • Round air inlet adaptors
  • Battery chargers
  • CSA certified version available with
  • Mechanical joint assembly connections
  • Flexible fittings
  • Elbows
  • Flanges
  • Gas filter
  • Advisor display panel
  • Communications module
  • Lubricating oil
  • Oil bypass filter
  • Air prelube pump
  • Front stub shaft
  • Pulleys
  • Special paint
  • EEC DOI certification
  • Factory commissioning