IHI TRE100 Compressor Overhaul
A full maintenance scope on an IHI TRE100 centrifugal air compressor: the high-speed rotor was taken out for dynamic balancing, every bearing and the gas / oil seals were checked, the scrolls, diffusers, gas cooler and oil cooler were cleaned and painted, and the filter set and turbo oil were renewed.
Quick facts
| Item | Detail |
|---|---|
| Machine | IHI TRE100 centrifugal (turbo) air compressor |
| Rotor work | High-speed rotor removed and dynamically balanced |
| Bearing and seal check | All bearings inspected; gas seal and oil seal checked |
| Flow path | All scrolls and diffusers cleaned; gas cooler and oil cooler cleaned |
| Surface protection | Cleaned scroll and cooler housings painted |
| Consumables | Oil filter, air filter and oil mist filter elements replaced |
| Performed by | Turbomax service team |
Machine background
A TRE100 is an IHI centrifugal air compressor built around a high-speed rotor that carries the impellers between tilting-pad bearings, with the compressed air passing through inlet scroll, diffuser and scroll sections stage by stage and being cooled between stages in gas coolers. Oil does not enter the air path: the rotor is separated from the gearbox oil by a gas seal, and the oil mist separator keeps oil out of the discharge air.
That architecture means the machine has three independent weak points that all show up as the same complaint — "the compressor is not holding pressure any more". Deposits on the scroll and diffuser surfaces reduce flow area; a fouled gas cooler raises stage inlet temperature so each stage has to work harder; a worn gas seal or a loaded oil mist element puts oil into the air path. An overhaul is the point where all three are checked at once, because the machine is already open.
Scope of work
- Rotor removal and dynamic balancing — the high-speed rotor was taken out, the impellers and journals cleaned and inspected, and the assembly dynamically balanced before reassembly. Balancing is done on the rotor itself, not inferred from vibration readings at the casing.
- Bearing inspection — every journal and thrust bearing was checked for clearance, babbitt contact pattern and signs of wiping. Any pad that showed heat damage or clearance growth was recorded for replacement.
- Gas seal and oil seal check — both seals were inspected for wear and leakage paths. On a machine of this type, a worn gas seal shows up as oil in the air and a worn oil seal as air in the oil, so both sides are checked in the same shutdown.
- Scroll, diffuser and cooler cleaning — all scrolls and diffusers were cleaned of deposits, and the gas cooler and oil cooler were cleaned on both the air and water side to restore heat transfer.
- Painting — the cleaned scroll and cooler housings were painted so the surfaces stay protected against corrosion until the next service interval.
- Consumables renewal — oil filter, air filter and oil mist filter elements were replaced, and the machine refilled with the correct turbo oil.
Photo record
Why rotor balancing is the decisive step
On a high-speed turbo compressor the rotor is the fastest-turning component in the train, so unbalance is not a cosmetic issue. A rotor that is slightly out of balance loads the tilting pads unevenly, raises pad temperature and pushes vibration into the alarm band long before anything looks damaged. Cleaning the impellers also changes the balance, which is why the rotor is balanced after cleaning rather than before.
The same applies to the parts that go back in. Alternative bearings and seals are only safe when the clearance, preload and material match the original drawings; a pad that fits but carries the wrong preload will overheat within days of startup. Turbomax supplies TRE bearings, seals, impellers, diffusers and cooler bundles against OEM part numbers and confirms dimensions before dispatch.
Frequently asked questions
Why is the high-speed rotor removed and dynamically balanced during a TRE100 overhaul?
The high-speed rotor is the only part of a TRE100 that turns at full pinion speed, so any residual unbalance shows up directly as vibration and as load on the tilting-pad bearings. Taking the rotor out allows the impellers, shaft journals and seal surfaces to be inspected at the same time, and the balanced assembly can be measured before it goes back into the gearbox.
What is checked on the bearings and seals during a TRE100 overhaul?
Every journal and thrust bearing is measured for clearance and inspected for babbitt contact, scoring and wiped areas. The gas seal and oil seal are checked for wear and leakage paths, because a worn seal lets oil migrate into the air path or allows air to escape into the oil circuit. Parts are replaced only where the measurement or the visual condition calls for it.
Why are the scrolls, diffusers and coolers cleaned and painted?
Dust, oil mist and corrosion deposits build up on the scroll and diffuser surfaces and inside the gas cooler and oil cooler. Deposits on the flow path reduce efficiency and raise discharge temperature, and rust inside the cooler housing eventually contaminates the water side. Cleaning restores the flow area and the heat-transfer surface; painting protects the cleaned surfaces against corrosion until the next overhaul.
Which consumables are renewed in a TRE100 maintenance scope?
The standard set is the oil filter element, the air filter element and the oil mist filter (oil mist separator) element, together with fresh turbo oil matched to the machine. Filters are replaced as a set because a restricted oil filter raises bearing temperature and a loaded oil mist element causes oil carry-over into the discharge air.
Can Turbomax supply the parts needed for a TRE100 overhaul?
Yes. Turbomax supplies alternative tilting-pad bearings, gas and oil seals, impellers, diffusers, scrolls, gas and oil cooler bundles and the oil filter, air filter and oil mist filter elements for the IHI TRE series. See our IHI TRE spare parts list.
Need an overhaul or spare parts for your IHI TRE compressor?
Send us the compressor model, serial number and the part numbers stamped on the nameplate or maintenance manual. We will confirm the part list, dimensions and availability before your shutdown window is fixed. Turbomax supports overhaul projects worldwide; our founder has 10 years of IHI-Sullair field service experience.
Related parts pages
IHI TRE spare parts Tilting pad bearings Impellers Diffusers Intercoolers & aftercoolers
Other maintenance cases
IHI TRE60 first overhaul at 44,000 h IHI TX-A overhaul IHI TRX160 overhaul IHI TX-Z overhaul IHI F44A3 overhaul
Spare parts by model
T2ATXATRATRET3ATRXTA3000TA6000TA9000TA11000MSG
Related technical guides and component pages
- Centrifugal compressor maintenance grades A to E — what each service grade covers and how the intervals are decided.
- Journal and thrust bearings — bearing types, fit checks and replacement criteria.
- Vibration transmitters and sensors — part numbers and what a rising trend means before an overhaul.
- What the parts of a centrifugal compressor are called — IGV, diffuser, scroll, tilting pad bearing and seal naming.
- IHI centrifugal compressor series guide — T2A, T3A, TRA, TRE, TRX and TXA model comparison.