The world leader in the design, manufacture and support of industrial turbochargers
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7 Series Turbochargers
Reputation based on quality, reliability and performance
7 Series Range Turbochargers
The 7 Series is our tried and tested core turbocharger, offering outstanding performance and reliability across the range since 1998. These highly regarded units are developed with two key objectives in mind, namely: performance-led design with minimal cost of ownership.
When it was first introduced, the 7 Series represented a fundamental shift in turbocharger performance, combining market-leading pressure ratio and efficiency levels with excellent reliability due to an innovative layout and bearing design. Since then, new variants have been continually developed in response to customer demands for ever-increasing pressure ratio and flow capabilities.
Today's range is designed to provide customers with flexible, cost-effective solutions that can be tailored to specific requirements and are fully supported by our global service network.
Designed for success
Proven reliability with long service intervals for lower cost of operation
More power to your engine - do more for less
Industry standard efficiency levels
Complies with all marine and land-based legislation, and Best Available Technology
Compatible with all fuel types, for ultimate flexibility
Tailored for use in marine, power generation and rail applications
Fully supported by our world-class global service network
7 Series Performance
There are several 7 Series compressor variants available, each tailored to specific applications. The latest variant features pressure ratios up to 5.2:1 with peak efficiencies of 84%.
The current Napier Turbocharger products utilise the latest technologies offering outstanding performance across the range. It's your answer to achieving more power and efficiency, whilst lowering fuel consumption and emissions.
Typical NA307L Compressor Map
7 Series Compressor
Wide compressor map
thanks to anti-surge technology allowing peak efficiency operation (up to 84%) in different applications, with increased surge margin.
Cost-effective and stress-resistant
aluminium alloy compressor which does not compromise performance and durability.
Highest possible levels of efficiency
thanks to 3D CFD (Computational Fluid Dynamics) design of all components making up the aerodynamic compressor elements.
Ultimate durability
achieved utilising Finite Element Analysis (FEA) to ensure compressor wheel gives optimum performance and minimum wear even under great stress.
Retrofit of engines
to achieve IMO11 requirements, reducing emissions and fuel consumption while maintaining the same installation of the earlier 7 Series.
7 Series Turbine
Longer lasting components achieved using Finite Element Analysis (FEA) testing to identify high stress points which have then been designed out.
Airflow optimised for better performance by using 3D CFD (Computational Fluid Dynamics) 3D CFD (Computational Fluid Dynamics) software in the design of aerodynamic components.
Heavy Fuel Oil optimisation through rigorous testing and analysis, and investigation into the latest water-washing techniques, for ultimate flexibility.
Additional flexibility to operate with both constant and pulse pressure systems, matching your engine set up.
Lowest possible fuel consumption achieved thanks to ability to move peak efficiency point along the range, reducing cost for your operation.
7 Series Bearing
Proven, reliable design suits the pressure ratio requirements of IMO1 engines, while providing utmost reliability under the arduous operating conditions of marine, powerplant and rail traction environments.
More reliable operation and low wear and tear thanks to hydrodynamic journal bearings which feature a squeeze film damper for vibration resilience (semi-floating design).
Compact, space-saving design using our tried and tested bearing arrangement of ergonomically mounting the thrust bearing between the journal bearings.
Innovative shaft sealing means no leakage at very low engine loads.
7 Series Casing
Intelligent, safe design, aircooled for simplicity and efficiency, with proven burst containment meeting all classification society approvals.
Reduced cost and potential for leakage thanks to integrated oil inlet and drain.
Easy to install, compact and flexible, with waste ports on gas inlet and outlets, rotatable casings, and a number of axial and radial gas inlet options to meet a wide range of engine and engine room requirements.
Conforms with SOLAS (Safety Of Life At Sea), answering strict insulation sound and temperature requirements for safety, liability and peace of mind.
