Getting up to speed on Cummins' natural gas turbochargers – part 1

Holset ® turbocharger

Cummins’ technological leadership in developing Holset® turbochargers for diesel power solutions is well documented, but some people may be surprised to learn about Cummins’ leadership in designing turbochargers for low emission natural gas engines. While investment in cleaner technologies seems to be a relatively recent trend for many, Cummins Turbo Technologies (CTT) has been designing and manufacturing natural gas Holset turbos for decades. In addition to our years of experience with >19-liter large commercial engines, the growth in the on-highway market has pushed technology and driven improvement in our technology offerings. 

In this two-part series, we’ll highlight four key elements that contribute to the success of Cummins’ natural gas turbochargers.                                               

1. Cummins has responded to a shift in technology

In order to reduce emissions, the on-highway natural gas market moved from lean-burn to stoichiometric combustion engines. Stoichiometric combustion recipes drive high exhaust temperatures and therefore generate severe thermal duty cycles. Holset turbochargers are able to meet these requirements through more compact turbocharging solutions tailored to emissions requirements.

Today, Cummins is dedicated to satisfying increasing natural gas turbocharger demands, especially in regions where infrastructure is growing. The attractive total cost of ownership in China has resulted in increased infrastructure growth and caused a surge in the demand for natural gas fueled on-highway freight vehicles. India is also starting to see natural gas infrastructure develop backed by sustained efforts of the government, which is fueling demand for natural gas engine technologies. Demand in Europe, North America, and other regions will also grow over the next decade due to low NOx and lower greenhouse gas emission regulations being introduced. 

To cope with the differences in mechanical turbocharger design for natural gas applications, Cummins has conducted significant work to develop capable analytical tools for simulative assessments of vibration and thermal fatigue. The advances in Thermo-Mechanical Fatigue (TMF) analysis have made iterative design optimization easier and enables CTT to select robust designs prior to committing to costly production tooling, which also eases the reliance on expensive engine endurance test work.

2. Natural gas air handling technologies designed to meet a multitude of challenges

Engine requirements have evolved as emission norms have changed over the last decade, but Cummins has remained at the technological forefront by introducing turbocharger technologies that meet the challenging demands posed by the natural gas market. In addition to helping address emission challenges, Cummins has invested design efforts into natural gas developments to be a leader in fuel consumption, reliability and durability. Inherently, turbochargers used for natural gas engines have notably different performance attributes compared with their diesel counterparts. Cummins has designed very specific turbocharger aerodynamic characteristics that enable high-performance for stoichiometric natural gas engines, while simultaneously evolving other key features of the turbocharger to meet robustness and reliability targets over the service life of the engine. 

Stay tuned for the second part of this series that explains the other benefits of Cummins’ natural gas turbochargers. In the meantime, you can stay connected with Cummins and learn more about the exciting developments we’re making in the natural gas space by signing up for our newsletter.

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Cummins Inc.

Cummins, a global power technology leader, is a corporation of complementary business segments that design, manufacture, distribute and service a broad portfolio of power solutions. The company’s products range from internal combustion, electric and hybrid integrated power solutions and components including filtration, aftertreatment, turbochargers, fuel systems, controls systems, air handling systems, automated transmissions, electric power generation systems, microgrid controls, batteries, electrolyzers and fuel cell products.

Cummins Custompaks are being used for water management as Thailand struggles with its water crisis

CustomPak on site

Water crisis

Sixty Cummins Inc. CustomPaks are in service in Thailand as part of a critical water management plan aimed at easing the country’s water crisis – a crisis that has caused enormous economic and social damage and stirred conflict among communities.

Over the past several decades, Thailand has continually faced water problems caused by severe drought. Water reserves in dams and reservoirs are insufficient while water resources are often contaminated with toxins caused by urban communities and the industrial and agricultural sectors.

Severe flooding is a threat, too, at a time when the realities of climate change are hanging over the country.

As a result, the allocation of precious water resources, which must be shared among various stakeholders including new and existing industry, large and small agriculture, and cities and villages has become a flashpoint.

Kittithanapat Engineering Co. (KTP), has been involved in the water management system since 1996, working closely with authorities such as the Royal Irrigation Department, Department of Water Resources, Bangkok Metropolitan Authority and others.

CustomPaks on site

600 hp CustomPaks

To help KTP meet its often urgent requirements, Cummins DKSH (Thailand) has recently supplied 60 Australian-built CustomPaks – 45 powered by Cummins’ X15 engine rated at 600 hp, and 15 powered by the QSL9 rated at 325 hp. These fully self-contained powerpacks are emissions certified to Tier 3.

The CustomPaks are coupled to hydraulically-driven, large-volume submersible water pumps sourced by KTP from US company Moving Water Industries (MWI); KTP is the exclusive distributor in Thailand for these MWI Hydroflo pumps.

Prior to Cummins’ involvement, KTP was using another diesel engine brand but service support wasn’t up to the standard required.

Long-serving KTP engineer Kittisak Thanasoot says Cummins DKSH’s reputation for technical and aftersales support along with the reliability of the Cummins product were a key reason behind KTP’s decision to specify the CustomPaks for the Royal Irrigation Department.

The ability of Cummins DKSH to respond to short delivery times was also important.

“Supplying large quantities of high horsepower diesel engines for emergency situations such as flash flooding can be a challenge for KTP,” says Kittisak Thanasoot.

“Responding to the needs of the government agencies to manage such problems in a timely manner and with least impact on communities, KTP has found the answer in our partnership with Cummins DKSH.”

Power, pride and passion

Parked semi truck

The switch back to Cummins power has been beneficial for iconic New Zealand company Uhlenberg Haulage. It's all about whole-of-life costs.

Uhlenberg Haulage is closing in on 60 years in business, having been founded in 1966 by Mike and Carol Uhlenberg.

Based in Eltham, Taranaki, in New Zealand’s North Island, the operation is today owned and operated by their sons Chris, Daryl and Tony Uhlenberg.

Describing the Uhlenbergs as “old school family truckies”, Daryl talks about the company’s time-honored journey with a definite tone of pride, especially the work of his parents in laying the foundations for what is today an iconic fleet in its own right.

Cummins Inc. made its debut in the Uhlenberg fleet in 1971 with an NH250 powering a second-hand Kenworth K923 used in logging. A second Kenworth, a new W924 with a Cummins NTC335, followed soon after hauling an LPG tanker.

The Uhlenberg operation today comprises 40 prime movers and a variety of trailing gear to cater for the myriad of a jobs the fleet is involved in.

A number of Peterbilts feature in the fleet although Kenworth is now the brand of choice with six new units to be delivered over the next 12 months to cater for business growth.

Cummins’ X15 Euro 5 engine rated at 550 or 600 hp is the preferred power specification, with 18 red engines currently in the fleet.

Uhlenberg family in front of truck

Whole-of-life support

“The switch to Cummins has been a very good experience for us. We have nothing but praise for the Cummins organization,” says Daryl.

“The whole-of-life picture is the key thing for us and we’ve got that nailed with the support we get from Cummins – parts availability, scheduled maintenance, life expectancy and in-frame rebuilds.

“So the red engines turn up, we run them to life, which is 900,000 to 1.2 million kilometers, and then Cummins does an in-frame overhaul in a timely manner. If there’s an issue, parts and support are close by.

“The support we get from Cummins Palmerston North is fantastic, second to none.”

Daryl recently looked under a Kenworth that was in the workshop for a service and was surprised to see no oil leaking from the one-million-kilometer X15. “I remember when I was a fitter we had to wear a raincoat when working under a truck,” he jokes.

Fuel agnostic

Acknowledging that the push to decarbonize is now “very real”, Daryl likes the idea of Cummins’ fuel agnostic concept where one base internal combustion engine, optimized to run on diesel, can also be customized to run on ultra-low and zero-carbon fuels like renewable natural gas and hydrogen.

“My father was a pioneer of linehaul trucking in New Zealand and he always embraced new technology. He was never scared of it,” he says.

“I tend to be a little more cautious but I can see where a 500 hp natural gas or hydrogen engine would work for us in short haul applications,” he admits. “We’re certainly willing to look closely at these alternative fuel technologies when suitable infrastructure is in place.”

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