EGR Turbo Compressor

EGR compressor: a one-stage turbo-compressor with an asynchronous motor and a variable frequency drive.​

​Exhaust Gas Recirculation (EGR) is a method to significantly reduce the formation of Nitrogen Oxides (NOx) in marine diesel engines. By using this technology, vessels are able to meet with the IMO NOx Tier III standard emission limits applying to the North American and United States Caribbean Sea as well as any new NOx Emission Control Areas (NECA).

The EGR compressor is a one-stage turbo-compressor with oil lubricated bearings, direct driven with an asynchronous motor and a variable frequency drive. The design features the unique flow optimization mechanism, utilizing inlet guide vanes to optimize efficiency for a given motor rating.

The core compressor features an impeller with backward leaning blades angled according to regulation and milled from a solid, forged piece of duplex stainless steel with an optimal weight/strength ratio.

All parts in contact with the medium are made of corrosion resistant steel. The compressor is equipped with a contact free carbon floating ring sealing to ensure that no exhaust gas can escape from the compressor casing.

EGR Compressor selection


Our company was initially founded in 1882 as 'Helsingoer Shipyard', and since 1973 we developed and established the HV-Turbo compressor brand. Since 2012 the manufacturing of compressors has taken place in our modern production facilities in Frankenthal/Germany, while the Aeration Competence Centre remains located in the historical buildings of the former shipyard in Helsingoer, Denmark.

Product Design

The right design and engineering team is critical to our customer’s success. With our unique skills and services, our dedicated R&D team members are specialists in developing high performance compressors and creating solutions to complement our customer's design team. Our design and engineering expertise includes soft- and hardware engineering and mechanical engineering.


The advanced test rig, incl. mechanical and functional testing and performance simulation, provides verification that all technical requirements have been met before the compressor leaves the factory.


Since its development, in cooperation with MAN Diesel & Turbo, our EGR compressors have been integrated into numerous two-stroke diesel engines, making these compliant with the IMO NOx Tier III standard emission levels on vessels already in operation.

Service Set-up

An extremely reliable, mechanical design guarantees a long service life. Should an incident unexpectedly occur leading to a failure, a swop service set-up for fast replacement is possible. Concept: a similar refurbished compressor will immediately be available from one of our certified repair shops. It is then possible to return the exchanged unit.


Our EGR turbo-compressors have been developed in accordance with a range of international standards including ISO 5389 2005-12-15, DIN EN ISO 5167-1,-2:2003, IEC 60034-1 & 2, and more. See our brochure for the full details. They also comply with the regulations set by the International Association of Classification Societies (IACS) dedicated to safe ships and clean seas.

EGR series turbo compressor

Principle of the EGR system.​

​In the EGR system, after a cooling and cleaning process, part of the exhaust gas is recirculated to the scavenge air receiver. In this way, part of the oxygen in the scavenge air is replaced by CO2 from the combustion process.

This replacement decreases the O2 content and increases the heat capacity of the scavenge air, thus reducing the temperature peak of the combustion and the formation of NOx. The NOx reduction is almost linear to the ratio of recirculated exhaust gas.

The EGR module for the two-stroke diesel engine includes the following main components:

1-4 EGR compressors are integrated into 1 diesel engine.

  • Scrubber
  • Cooler
  • Water mist-catcher
  • EGR turbo-compressor

Why choose the EGR Series turbo compressor?

Our experience

With over 100 years of experience and continuous development, and a fleet of more than 4,000 installed turbo compressors, we are a prime partner for your business.

Global presence, local service

In our experience, there is no substitute for local support, that‘s why we have local teams ready to help.

Research and development

Continuous research, development and analysis of both new and aftermarket turbo compressors to optimise customer benefits, product performance and reliability.

Modern manufacturing

Our state of the art production facilities and strict quality controls guaranties a highest degree of reliability and quality.

Reputation for quality

We are accredited to ISO 9001 and ISO 14001 and are regularly audited by major customers and internationally recognized assessment organizations.

Pre-designed turbo compressors

Our modular design always guarantees to serve you with perfectly tailored solutions based on well proven components only.


North America

North America


Laura Golubski


Latin America

South America


Laura Golubski


Rest of World

Rest of World - New Build


Elizabeth Jaeger (+45 4921-1400)

If you would like to submit an enquiry please get in touch.