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Cooper has successfully tested a slow-speed integral engine running on a hydrogen (H2)-natural gas fuel blend. The groundbreaking test comes 5 months after the announcement of Cooper’s joint hydrogen research project with a major U.S. gas pipeline company to demonstrate the safe operating range of H2 blends in large-bore internal combustion engines.

“Cooper’s hydrogen development initiative took another large step forward today. We ran an unmodified large-bore, slow-speed integral engine-compressor with an H2 blend of 5% by volume, and we achieved significant reductions of methane in the exhaust. This is the first such run using significant amounts of hydrogen in an engine of this design.” said Cooper CEO, John Sargent. “In May, we will be running up to 33% by volume in the same stock engine. Our customers have thousands of similar units running globally, so the potential reduction of methane is substantial.”

The Cooper test was conducted at their slow-speed integral engine test cell at corporate headquarters located in Houston, Texas. The test engine is the current production, NSPS compliant CleanBurn PlusTM AJAX® 2802 with 15″ piston bore, 16″ power stroke, and a speed range of 360-440 RPM. Cooper selected the AJAX engine due to the similarities of its combustion system to that of the large fleet of the other engine brands the company services (Clark, Cooper-Bessemer®, Ingersoll Rand, and Worthington).

CleanBurn Plus AJAX 2800 Integral Engine
Cooper's engineering team and CEO, John Sargent,
in the control room during the hydrogen test.

Hydrogen (H2) & Natural gas fuel mixture

The addition of hydrogen to the combustion of other fuels is an exciting approach to lowering emissions. Cooper can adapt your slow-speed integral engine compressor to run on up to 10% hydrogen mixed with natural gas. Contact us to learn what we can do to enable your engine to run on hydrogen.

In October 2022, Cooper and Southern Star Central Gas Pipeline, Inc. (Southern Star), a U.S.-based interstate natural gas pipeline company, announced the signing of a memorandum of understanding (MOU) to launch a joint hydrogen research project aimed at converting Southern Star’s fleet of gas fired reciprocating integral engines to combination gas-hydrogen fired units.

Hydrogen (H2) Compression

Hydrogen is a clean fuel used most frequently in transportation and power generation applications. Hydrogen is typically produced at relatively low pressures and must be compressed prior to transport. Reciprocating compressors are the most commonly used compressors for applications that require very high compression ratios.

Cooper has been providing compressors for hydrogen compression and storage for decades. Many Superior and Cooper Bessemer hydrogen compressors are installed around the world, in countries like Iraq, Russia, Costa Rica and USA.

Hydrogen trim is available for every Superior compressor model including CFA, RAM, CFR, CFH, MH, WH and WG. The trim Includes a Type 3 distance piece, oil slinger, 17-4PH SS piston rod with tungsten carbide coating in the packing travel area, valves with sour gas trim, purged-type packing and cylinder testing with helium.


Biogas is a type of biofuel that is naturally produced from the decomposition of organic waste either in a landfill or a biogas digester at a sewage treatment plant. Microorganisms break down the organic material in a digestion chamber and convert it into biogas.

For decades, Cooper compressors have been used to gather and boost biogas. In the 1970s, a Cooper-Bessemer GMVH integral engine-compressor was deployed in Staten Island for a biogas boosting application. More recently, Superior RAM and CFR compressors have been used for biogas boosting in Arizona.

Cooper has also been at the forefront of power generation with biogas as fuel. Our Cooper-Bessemer LSV-B engines have been in service for decades in an Orange County, California, sanitation district for combined heat and power (CHP). Similar engines have long been deployed in the Nassau County, New York, sanitation district for power generation. Our Superior engines are commonly used for biogas applications.

E.S.G. at cooper

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