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Marine Diesel Engine Turbocharger is a key engine component used to increase the air intake volume of the combustion chamber. It uses exhaust gas energy to drive the turbine and compressor, helping improve combustion efficiency, engine power, and overall performance.
With reliable efficiency and durable resistance to high temperature, pressure, and continuous operation, this turbocharger is suitable for marine engine maintenance, overhaul, and replacement applications. It helps improve engine response, reduce fuel consumption, and support stable operation under demanding working conditions.
HY MARINE NR20 turbocharger is a genuine matching complete supercharging unit designed for MAN B&W NR20 series marine diesel engines. Adopting single-stage radial turbine and centrifugal compressor structure, the whole machine is integrally cast with high-temperature resistant superalloy and precisely assembled with high-speed rotor components. Optimized for marine heavy fuel oil operation, high-temperature exhaust impact and long-duration variable-load navigation, this turbocharger features high compression ratio, ultra-stable high-speed operation and excellent thermal fatigue resistance. It effectively boosts engine air intake efficiency, optimizes fuel combustion, reduces exhaust black smoke and carbon deposition, and eliminates common faults such as insufficient power, turbo surge and thermal attenuation. Supplied as a complete assembled unit with full internal components pre-tested, it supports direct replacement and overhaul assembly for marine main and auxiliary engines, greatly shortening ship maintenance cycles and reducing long-term operational failure risks.
All data below is obtained from standardized factory testing under simulated marine high-temperature, high-speed and heavy-fuel operating conditions.
Parameter | Details |
Applicable Model | MAN B&W NR20 Series (R149 / R170 / R182 / R231) |
Base material | High-temperature superalloy housing + titanium-aluminum rotor + high-strength bearing alloy |
Structural type | Single-stage radial turbine, centrifugal compressor, inboard plain bearing structure |
Core component treatment | Vacuum high-temperature aging, dynamic balance calibration, anti-corrosion surface treatment |
Max operating speed | 44,000 RPM |
Max resistant temperature | 650°C |
Compression ratio | Up to 4.5 |
Power adaptation range | 450kW – 5400kW |
High temperature stability improvement | 57% higher than ordinary marine turbochargers |
Continuous operation life | 12,000+ hours under marine variable load conditions |
Assembly precision tolerance | Within 0.01mm |
Batch qualification rate | 99.7% |
Field operation failure rate | Below 0.3% |
Certification | CCS Type Approval Certificate |
Custom & Refurbish Cycle | 7-15 working days |
The complete NR20 turbocharger adopts 5-axis CNC integral precision machining and high-speed dynamic balance calibration technology. The turbine blade profile, compressor flow channel and rotor assembly clearance fully comply with MAN B&W original OEM standards. Designed with uncooled casing and engine oil integrated lubrication structure, the unit adapts to long-term heavy fuel oil combustion and high-temperature exhaust impact in marine environments. Ultra-precision assembly eliminates rotor jitter, airflow deviation and pressure surge risks. It maintains stable supercharging efficiency under continuous variable load and high vibration conditions, effectively improving engine combustion efficiency, reducing fuel consumption and black smoke emission, and avoiding power drop and unstable operation during long-distance ocean voyages.
Every complete NR20 turbocharger undergoes full-standard factory testing before delivery, including housing pressure resistance test, rotor high-speed dynamic balance test, full-flow supercharging efficiency calibration, high-temperature thermal cycle aging test and lubrication system matching test. Complete official factory test reports, performance parameter sheets and assembly inspection records are provided with each order. Ship repair teams can perform direct installation and commissioning without secondary performance testing, saving inspection costs and greatly shortening engine overhaul and recovery cycle.
All NR20 marine turbocharger complete units are equipped with valid CCS Type Approval Certificate, fully complying with international marine industry specifications and ship inspection standards. Both new finished units and refurbished turbochargers implement unified marine-grade quality control standards, meeting global vessel annual inspection, class audit and port clearance requirements.
The NR20 turbocharger is specially applicable to MAN B&W NR20 series marine two-stroke and four-stroke diesel engines, covering R149, R170, R182, R231 and other full-range sub-models. It is widely used for main propulsion engines and power generation auxiliary engines of container ships, oil tankers, bulk carriers, harbor tugs and offshore platform supply vessels. Suitable for new ship OEM supporting assembly and old ship engine overhaul, turbo system renewal and routine maintenance replacement. It stably optimizes engine power output, reduces carbon deposition failure rate, and effectively lowers vessel downtime caused by turbocharger system faults.
MAN B&W | NR15,NR20,NR26,NA40,NA48,NA57,NA70 |
IHI | RH133,RH143,RH163,RH183,RH203,RH223,RH253,RH1022,RH1221,RU110,RU120,RU203Y |
MHI | MET33SB,MET42SB,MET53SB,MET66SC,MET71SC,MET83SC,MET30,MET33,MET42,MET53,MET66,MET71 |
ABB | VTR160,VTR161,VTR200,VTR201,VTR214,VTR250,VTR251,VTR254,VTR304,VTR320,VTR321,VTR354, VTR400,VTR401,VTR454,VTR500,VTR501,VTR564,VTR714 |
TPS44,TPS48,TPS50,TPS52,TPS57,TPS61,TPL65,TPL69,TPL73,TPL77,RR131,RR151,RR181,RR221 |
Our NR20 complete turbocharger is fully compatible with all MAN B&W NR20 series marine diesel engines, including NR20/R149, NR20/R170, NR20/R182 and NR20/R231 sub-models. It perfectly matches marine main engines and auxiliary generator sets with a power range of 450kW to 5400kW for direct replacement.
This turbocharger is professionally optimized for harsh marine working conditions, supporting long-term stable operation with heavy fuel oil (HFO), marine diesel oil (MDO), biofuel and gas fuel. It features strong anti-pollution and anti-coking performance, fully adapting to complex fuel environments of ocean-going vessels.
All our NR20 marine turbocharger complete units are equipped with valid CCS Type Approval Certificate, complying with international marine industry standards and ship inspection specifications. The products can smoothly pass vessel annual inspection, class audit and port customs inspection with zero compliance risk.
Standard in-stock NR20 turbocharger complete units can be shipped within 7–10 working days. For customized assembly, precision refurbishment and special parameter matching orders, the production cycle is 7–15 working days, with stable quality and guaranteed delivery schedule.
Yes. Each NR20 turbocharger is delivered with complete factory official documents, including dynamic balance test report, supercharging efficiency calibration data, high-temperature resistance test record and overall dimensional inspection sheet. Customers can install and debug directly without secondary testing to save maintenance time and labor costs.
Under standard marine continuous variable load and high-temperature exhaust conditions, the stable service life of the NR20 turbocharger reaches 12,000+ hours. The batch qualification rate is up to 99.7%, and the field operation failure rate is strictly controlled below 0.3%. It effectively avoids common faults such as rotor unbalance, insufficient supercharging pressure, turbo surge and high-temperature ablation, reducing long-term ship operation and maintenance costs.
