ABB HPT becomes MAN two-stroke option

29 Apr 2013
ABB's HPT (high pressure tuning) turbo option is being offered with MAN two-stroke engines

ABB's HPT (high pressure tuning) turbo option is being offered with MAN two-stroke engines

ABB Turbocharging says that its high-pressure tuning (HPT) has been added to the list of options offered by MAN Diesel & Turbo’ for its two-stroke engine range.

ABB describes HPT as: “A new engine tuning for part and low loads designed to fully leverage pressure ratio and turbocharger efficiency, two critical factors in a turbocharger that are often not used to their full potential”. The company explains that HPT forces more air into a two-stroke engine by increasing the pressure 0.5 bar above the pressure normally expected from the turbocharger.

When operating at part and low load, most engines require extra hardware such as an exhaust gas bypass (EGB) or variable turbine geometry to reduce excess pressure from the cylinders. HPT is a way of providing a similar effect without additional components, working by delaying the closing of the exhaust valve. Therefore, according to the company, HPT offers similar benefits to more complicated engine tunings, but in a simpler, and consequently more reliable, format that does not compromises on fuel efficiency.

HPT is claimed to reduce component cost, cut maintenance costs because there is no extra hardware or moving parts, and provide fuel-efficiency across the low- and part-load output range. Fuel consumption reductions of 5g/kWh are quoted. HPT is therefore particularly applicable to slow steaming.

“Recent developments at ABB Turbocharging have yielded very high pressures from our turbochargers for two-stroke engines, and we saw potential there for optimizing fuel efficiency by using an uncomplicated concept,” said Christoph Rofka, head of new business at ABB Turbocharging. “In the merchant marine business, simplicity and reliability are key. There’s a lot of highly complex equipment that has to run to the very harshest environments, so when you offer a straightforward solution with benefits that are visible right away, people respond. With HPT, you have no exhaust gas bypass or extra moving parts. So you also have no service cost. The benefits are clear.”

“We are very pleased and flattered that MAN values this solution and wants to offer it to their own customers as one of their official engine tunings,” said Axel Kettmann, senior vice president. “And we look forward to collaborating with MAN in the future to offer innovative solutions that respond directly to and improve our customers’ situation. For example, a next logical step is to combine HPT with a high-pressure, high-efficiency turbocharger such as our new A200-L. Our customers have tested this solution, so we know for a fact that HPT is very effective on highly charged two-stroke engines. We expect this combination to generate truly exceptional technical and financial performance and to have a major impact on the marine industry.”

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