ABB VTR Turbocharger
Spare Parts Supplier
Nozzle rings · Rotor and blading · Rolling-contact bearings · Filter silencer
The frame number opens the chapter and closes nothing
The ABB turbocharger route overview reads a request series first and frame second. This page goes a level below that, into the axial VTR..4 and what its own product information asks a buyer to send.
That product information was published by ABB Turbo Systems. The business began at Brown Boveri & Co, which delivered its first industrially made turbocharger in 1924; ABB Turbo Systems was founded in 1989, and the turbocharging business completed its separation from ABB on 3 October 2022 to trade as Accelleron. An older VTR can therefore carry a Brown Boveri (BBC) plate, a later one reads ABB, and current documentation carries the Accelleron name. All three appear here for that reason.
A size class, and only a size class
The digits before the series digit say how big the machine is, and the maker is careful about the limit of that: its capacity ranges are offered as an initial guide to a size, and it states that before a machine can be precisely specified the turbine blades, guide vanes and compressor wheel variant have to be considered.
Two digits nobody has published a key to
ABB set its own dimension and oil tables under two headings, VTR..4-11 and VTR..4-32, and the trade writes a machine the same way — VTR 354-11, VTR 354P-11, VTR 454-11. Under the second heading only D-execution machines of the larger frames appear. What the digits denote is not explained there, and we have found no maker document that explains it, so we ask for the tail as stamped rather than decode it.
Matched to an engine, not configured from a menu
The maker calls the design modular: casing configurations, turbine blades and nozzle rings, compressor wheels and diffusers, so a machine could be matched to the engine it was sold with. The variables are named plainly — blade heights, many guide vane variants, wheel widths, a range of diffusers. Two machines of one frame on two engines are not the same on the turbine side.
The ..0 and ..1 series are a separate book
The older frames are documented apart: assembly instructions for the ..0 and ..1 series are a document of their own, carrying a revision dated 2020. A request naming one of those frames is answered from that set, not the ..4 tables, and the two are easy to confuse because the digits look alike.
Three things chosen once, and never written on the requisition
None is a specification. Each changes which parts list applies, and each is visible from the platform in front of the machine.
The first is the oil. The rotor runs in spring-mounted rolling-contact bearings outside the casings, reached from either end of the rotor, each with its own lubricating and oil-cooling arrangement and with centrifuges in that closed system separating dirt, so a bearing keeps clean oil even with the ship heeled. Imbalance from a swallowed particle is taken up by damping springs in the bearings themselves. The supply is not identical across the series: the maker tables a centrifugal oil pump on the smaller frames and a gear oil pump on the larger ones. And the arrangement was an option, not a property — sleeve bearings lubricated from outside were offered on request on the largest frames, at considerable extra cost, with separate oil filtering and a standby emergency tank to come with them.
The second is cooling, and the trap is the word uncooled. Uncooled gas casings were offered as an alternative for installations recovering exhaust heat, and on those the gas inlet ducts do not meet cooling water at any point. Water does not leave the machine: the turbine-end bearing housing is still cooled, with a small flow, to hold the oil temperature down, and the gas outlet casing jacket is cooled so surface temperatures stay inside the limits classification societies set against fire and accidental contact. A casing or O-ring line has to say which build it is.
The third is how the air gets in, which is the same subject as how the rotor comes out. Intake air arrives either through suction branches or through a filter-silencer, and the silencer carries an integrated filter that takes coarse dirt out of the intake and can be cleaned in service without the silencer being dismantled. That matters at overhaul, because the withdrawal sequence begins there: no air, gas or water pipe is disconnected to take out the rotor shaft, nozzle rings or diffusers — silencer or suction branch off, bearings out, air inlet casing and heat-insulating partition wall disconnected from the gas casing, rotor withdrawn. Read that sequence as a parts list: what is disturbed on the way in is renewed on the way back.
What is ordered against a VTR, in the order the machine comes apart
Grouped the way the maker takes it down: intake, bearings, rotor and blading, guide vanes and diffuser, then the casings and the water and oil connections.
- Filter-silencers, silencer inserts, felt noise plates, and suction branches where no silencer is fitted
- Rolling-contact bearings, compressor side and turbine side
- Damping spring assemblies, bearing covers and supports
- Centrifugal and gear oil pump components, according to the frame
- Oil centrifuges, sight glasses, covers, pipe and drain items
- Complete rotor assemblies, rotor shafts, impellers and inducers
- Turbine wheels, blades and blade locking hardware
- Nozzle rings, guide vane segments and diffusers
- Air inlet casing parts and compressor cleaning connections
- Casing parts and shroud rings, joint bolting, partition walls and heat shields
- Cooling water covers, plugs and O-rings, and the turbine-end cooling items an uncooled build still carries
- Sealing and labyrinth bushes, gaskets, O-rings and seal rings for a complete opening
- Overhaul and service kits quoted against the plate string, not the frame
A rotor, blading or guide vane line is written from the whole plate string, the serial number and the engine the machine sits on, with the last clearance record beside it. A balance record belongs with a rotor and stays with it. A part number off an older requisition is a starting point and no more: the machine it came from may have been matched for another engine. The spare parts supply process page sets out the rest.
What a VTR line is written from, and which figures we ask you to read
Where a figure decides a line here — a clearance, an oil quantity, a capacity — this page prints none. They are on your plate, in your clearance record or in the instructions aboard, and yours are the only ones that answer the question.
- Plate string photographed whole: maker name as it reads (BBC, ABB or Accelleron), frame, execution letter and hyphenated tail together
- Serial number, and whether the plate is the original one
- Engine make and type served, and which unit where more than one is fitted
- In-line or V engine, since the gas inlet casing was matched to the charging system
- Water-cooled or uncooled gas casing, read from the connections, not the file
- Bearing arrangement: own oil supply and pumps, or sleeve bearings fed from outside
- Which oil pump is fitted, whether it has been changed, and whether the oil is a turbine oil
- Intake arrangement: filter-silencer or suction branch
- Angular position of the gas and air connections as installed, described not measured
- For a guide vane or blading line: the last clearance record, and the condition that took the item out
- For a rotor: whether it returns to a machine the surveyor will see, where its balance record is, and the bearing support designation where the frame carries one
- Photographs of the plate, of the oil and water connections, and of the component before it is disturbed
Tools for this equipment: the Pt100 and thermocouple reader for the exhaust gas thermocouples. On the air side, the charge air condensate calculator works out the water that drops out of the charge air after the cooler, from the intake air, the boost pressure and the cooler outlet temperature. The air the filter-silencer draws comes from the engine room; where the ventilation of the room is in question, the engine room ventilation calculator adds the combustion air of the engines and boilers to the air that carries their heat away, by the ISO 8861 method.
A rotor is a survey item, a silencer insert is a store item
A VTR overhaul list holds both, and the bearings sit between them because here they are the machine's own consumable, not something the engine looks after.
The matched half is the hard end. Rotor assemblies, turbine wheels and blading, impellers, nozzle rings, guide vane segments and diffusers were chosen for one engine at the build and are balanced as an assembly, so the evidence travelling with them is a balance record and a clearance record rather than a dimension. The real question is often reconditioning of the removed rotor instead of replacement — a different request, with the unit itself as evidence. Vessel Core puts those lines on an OEM-route review, and where the plate string is incomplete we say which document the reference was checked against rather than pass a guess off as a match.
The rest divides cleanly. Silencer inserts and felt plates, casing gaskets and O-rings, sealing and labyrinth bushes, casing bolting, sight glasses, plugs and drain fittings have measurable geometry and stated material, and a verified alternative route can be reviewed on them where a buyer's approval requirements allow, with dimensional and material documentation checked at RFQ stage. Bearings and their damping springs are the interesting middle: ordered against the arrangement rather than the frame, with a different answer on a build using sleeve bearings lubricated from outside. Vessel Core is an independent spare parts supplier and states the route it proposes against each line, so a list carrying a rotor and a box of O-rings is answered as two enquiries.
ABB VTR parts — questions buyers ask
My plate reads VTR 354-11. Do you actually need the -11?
Yes, send it. The maker split its own dimension and oil tables into two headings distinguished by exactly that tail, and the trade writes machines as VTR 354-11 or VTR 354-32. What the digits denote is not stated there and we have found no maker document that states it, so we treat the tail as an identifier rather than something to interpret. Quoting against the string you have beats quoting against a reading nobody published.
Is the VTR series at end of life?
Not for parts. Accelleron lists the VTR among its legacy turbochargers, and its 2025 VTR factsheet states that it continues to support the VTR with original spare parts and technical services through its service network. The same legacy list records the compact VTC as no longer in production but still supported with original parts. So an OEM route exists on a VTR line; whether that route or a verified alternative suits a given item is answered per item. Send the plate string and the answer becomes a per-item one.
Can you quote a nozzle ring from the frame number alone?
The frame gives the size and very little else. The family was built with different blade heights, many guide vane variants, different wheel widths and a range of diffusers precisely so each machine matched its engine, and the maker says in its own words that blades, guide vanes and wheel variant have to be considered before a machine can be specified. The frame narrows a guide vane search; the full string with the serial closes it.
Does this machine have its own oil, or is it fed from the engine?
That depends on the machine, not the series, which is why we ask. The standard arrangement is self-lubricating rolling-contact bearings outside the casings, each with its own lubricating and oil-cooling arrangement and its own damping springs. Sleeve bearings lubricated from outside were available on request on the largest frames. The oil pump also differs between smaller and larger frames. One photograph of a bearing end and one of the oil connections settles it.
Which VTR parts can go on an alternative route?
The parts with measurable geometry and stated material: silencer inserts and felt plates, casing gaskets and O-rings, sealing and labyrinth bushes, casing bolting, sight glasses, plugs and drain fittings. A verified alternative can be reviewed on those where your approval requirements allow, with dimensional and material documentation checked at RFQ stage. Rotor assemblies, turbine wheels and blading, impellers, nozzle rings, guide vane segments and diffusers were chosen for one engine and are balanced as an assembly, so they go to an OEM-route review. Bearings and their damping springs sit between the two and are read against the bearing arrangement fitted.
Is Vessel Core connected to ABB?
No, and there is no agreement of any kind. Vessel Core holds no dealership, distribution, representation or partnership agreement with ABB, and quoting a component against one of its designations implies no approval by the maker and no claim of interchangeability.
