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A turbocharger core cartridge, also referred to as Center Housing Rotating Assembly (CHRA), is the rotating sub-assembly of a marine turbocharger that contains the turbine wheel, compressor impeller, shaft, bearing system, and center housing. It is the primary wear component replaced during turbocharger overhaul, allowing maintenance teams to restore rotational performance without replacing the full housings.
The cartridge operates as the energy conversion element of the turbocharging system. Exhaust gas flow drives the turbine wheel, which transmits torque through the rotor shaft to the compressor impeller, compressing intake air before it enters the engine cylinders. Proper balancing and bearing condition directly determine the service interval and operational reliability of the complete turbocharger unit.
Component | Function |
Turbine wheel | Extracts energy from exhaust gas flow |
Compressor impeller | Compresses intake air charge to the engine |
Rotor shaft | Transmits torque between turbine and compressor stages |
Floating bearings | Support radial load and enable high-speed rotation |
Thrust bearing | Absorbs axial thrust from pressure differential |
Piston ring seals | Prevent oil migration into gas flow paths |
Center housing | Contains bearing system and oil/cooling passages |
Labyrinth seals | Provide gas sealing at turbine and compressor sides |
The cartridge is delivered as a pre-assembled, dynamically balanced unit. This plug-and-play configuration reduces overhaul time in shipyard or at-sea maintenance scenarios compared with rebuilding from individual components.
Component | Material | Temperature Rating |
Turbine wheel | K418 nickel superalloy (Inconel equivalent) | Continuous 650°C, peak 700°C |
Compressor impeller | Cast aluminum alloy ZL105-T6 | Continuous 180°C |
Rotor shaft | 42CrMo forged alloy steel, induction hardened | - |
Floating bearings | Tin-based bearing alloy Babbitt lining | - |
Thrust bearing | Copper-lead alloy with surface coating | - |
Seal rings | Gray cast iron with nitrided surface | - |
Center housing | Ductile iron GGG-40 | - |
Material specifications align with original equipment standards for marine turbocharger applications. Material certification is traceable through batch records available on request.
Parameter | Specification |
Balancing standard | ISO 1940-1 Grade G1.0 |
Balancing method | High-speed VSR (Vibration Sorting Rig) |
Test speed | Up to 100,000 RPM (model dependent) |
Residual unbalance | ≤ G1.0 grade at rated speed |
Overspeed test | 115% × rated speed, 1 minute duration |
Each cartridge undergoes two-stage balancing: component-level balancing of turbine wheel and compressor impeller individually, followed by assembly-level balancing of the complete rotating cartridge. Vibration measurement data is recorded and included with the shipment documentation.
Core cartridges are primarily used in scheduled turbocharger overhaul programs for commercial vessel fleets. Typical replacement triggers include reaching manufacturer-recommended service hours, elevated vibration readings during condition monitoring, reduced boost pressure, increased exhaust gas temperature, or oil consumption from seal degradation.
Application categories include: main propulsion engine turbocharger overhaul on container ships, bulk carriers, oil tankers, and general cargo vessels; auxiliary generator turbocharger maintenance on all vessel types; turbocharger service for offshore support vessels and harbor tugboats; and fleet stock inventory for shipping companies operating multi-vessel fleets.
Replacement with a factory-balanced cartridge restores turbocharger performance to near-new specification while preserving the existing turbine and compressor housings, reducing overhaul cost compared with complete unit replacement.
All marine turbocharger core cartridges carry CCS (China Classification Society) Type Approval. Each unit passes the following verification steps before shipment: dimensional inspection of all critical mating surfaces, material hardness verification, high-speed dynamic balancing test, overspeed spin test, oil pressure and leakage test, and final visual inspection.
For commercial procurement orders, batch inspection reports and individual unit serial number tracking are available. Standard lead time is 7 to 10 working days for stocked models. Custom specifications, such as modified compressor trims or upgraded bearing materials, can be quoted based on technical requirements.
Compatibility with Marine Engine Models manufacturers:
The turbocharger assemblies cover the following marine turbocharger series across major
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 |
Assemblies are dimensionally interchangeable with original equipment units. Technical drawings anddimensional verification reports are available on request for cross-reference.
Identify the turbocharger manufacturer and series from the nameplate on the existing unit. Provide the series number and, if available, the original part number. Our technical team will confirm the matching cartridge specification.
No. The cartridge is fully balanced as a sub-assembly before shipment. Once installed into the existing housings, no additional balancing is required. Standard installation torque procedures must be followed.
Under rated operating conditions with proper lubrication and maintenance, the cartridge supports approximately 10,000 to 12,000 operating hours between overhauls. Actual service life varies with engine load profile, fuel quality, and maintenance practices.
Cartridge replacement can be performed in-port or at sea by qualified engine room personnel, provided proper tooling and service procedures are followed. Dry-docking is not required specifically for turbocharger cartridge replacement.
Each cartridge ships as a complete rotating assembly with bearings and seals pre-installed. Installation gaskets and an instruction sheet are included as standard. Additional spare parts such as gasket kits or nozzle rings can be ordered separately.
