Gas compression engines

G3512J

The line of G3500 engines brings versatility, uptime, and low operating cost to your gas compression operation. They are equipped with ADEM A3 technology that enables highest performance and safety while maintaining low emissions. Ideal applications for G3500 engines include gas lift, gas gathering, and wellhead gas compression. The Cat G3512J gas engines are rated at 772 bkW (1035 bhp) @ 1400 rpm and are NSPS site compliant capable with customer-provided air-fuel ratio control and aftertreatment.

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Engine Design

Proven reliability and durability
Ability to burn a wide spectrum of gaseous fuels
Robust diesel strength design prolongs life and lowers owning and operating costs
Broad operating speed range

Emissions

Meets U.S. EPA Spark Ignited Stationary NSPS Emissions for 2010

Lean Burn Engine Technology

Lean-burn engines operate with large amounts of excess air. The excess air absorbs heat during combustion reducing the combustion temperature and pressure, greatly reducing levels of NOx. Lean-burn design also provides longer component life and excellent fuel consumption.

Advanced Digital Engine Management

ADEM A3 control system providing integrated ignition, speed governing, protection, and controls, including detonation-sensitive variable ignition timing. ADEM A3 has improved: user interface, display system, shutdown controls, and system diagnostics.

Ease of Operation

Side covers on block allow for inspection of internal components

Full Range of Attachments

Large variety of factory-installed engine attachments reduces packaging time

Testing

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

Gas Engine Rating Pro

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

Product Support Offered Through Global Cat Dealer

More than 2,200 dealer outlets Cat factory-trained dealer technicians service every aspect of your petroleum engine Cat parts and labor warranty Preventive maintenance agreements available for repairbefore- failure optionsS•O•S^SM program matches your oil and coolant samples against 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 Gas Engine Manufacturing Experience

Over 60 years of natural gas engine production Ownership of these manufacturing processes enables Caterpillar to produce high quality, dependable products.
Cast engine blocks, heads, cylinder liners, and flywheel housings
Machine critical components
Assemble complete engine

Engine Specifications
Rated Speed	1400 rpm
Emissions	Lean Burn: EPA NSPS Site Compliant Capable with Customer Supplied Aftertreatment, 0.5 g/bhp-hr NOx
Minimum Rating	1035 BHP
Length	120 in
Width	86.7 in
Height	84.1 in
Weight - Dry	15611 lb
Oil Change Interval	2000 hours
Combustion	Lean Burn
Governor	Electronic (ADEM A3)
Maximum Rating	1035 BHP
Displacement	3173 in³
Aspiration	Turbocharged - Aftercooled
Stroke	7.5 in
Bore	6.7 in
Rotation from Flywheel End	Counterclockwise