Main design features:

Short bearing distance facilitates the precise rotor alignment.
 Single-walled, uncooled hot-gas casings whose waterless design minimizes the corrosion of the turbine casing (no washing in HFO operation) and dissipation of process heat. As a result, no cooling water system is used and the casings are light.
 Special V-profile clamps design of the compressor side promises their fast and easy (dis)assembly.
 One piece compressor wheel with backward-raked blades milled from high-tensile aluminium alloy material.
 Radial-flow turbine wheel friction-welded to the rotor shaft which is quite short achieving high rigidity and low mass.
 Inboard plain bearings with floating bearing bushes and a thrust bearing on the compressor side (except of MAN NR 34/S which is fitted with a locating bearing on the compressor side), lubricated by the engine lubrication oil using the same oil circuit. The specific design promises a long service life (25.000+ hours) and simplifies maintenance because of the easy access to both turbine and compressor wheels and the inexistence of oil pumps, filters and coolers.

Main benefits:
 Operational flexibility supporting both heavy and diesel fuel oil engine operation because of the high thermal tolerance (admissible exhaust gases of 720oC to the turbine side).
 Compact, light and plain design facilitating the attachment to the engine and maintenance because of the few main components and promising increased operational reliability.
 Cost-effective supporting a wide output range with low operating costs and long service life.

MAN NR series turbochargers:

• NR 12/S
• NR 14/S
• NR 17/S
• NR 20/S
• NR 24/S
• NR 29/S
• NR 34/S
• NR 15/R
• NR 20/R
• NR 24/R
• NR 26/R