6S50ME-GI10
The MAN 6S50ME-GI10 is a six‑cylinder, low‑speed 2‑stroke marine engine delivering up to 22 380 kW (≈30 000 hp) with dual‑fuel capability (HFO/VLSFO/MDO and LNG) via high‑pressure gas injection.
Engine Specifications
Inspector Detail
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Designation decoded
6 stands for 6 cylinders, S for Super-Long-Stroke, 50 for 500 mm bore, ME-GI for high-pressure gas injection (LNG), 10 for Mark 10.
Background
The S50ME-GI10 with 6 cylinders offers more power than the 5-cylinder version and better vibration behaviour. S/B 4.0 at 500 mm. For medium-sized LNG carriers.
Calculated metrics
Inspector checklist
- Cylinder liners: S/B 4.0 — side forces, LNG cold wear
- Piston rings: gas conditions
- Cylinder lubrication: BN25
- Gas injection valves: tightness at 300 bar across 6 cylinders
- HP compressor
- Gas detectors
- ME control
- Gas/diesel switchover
- Safety logic
- Scavenge air box: inspection openings
- Turbocharger
- Exhaust gas temperature across 6 cylinders
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Exhaust gas temperature after cylinder | 310–370 °C (LNG); 350–420 °C (diesel) | Spread >15 °C → check gas/pilot |
| Gas injection pressure | 280–320 bar | Deviation → HP compressor |
| Pmax | ±2 bar | Deviation → control system |
Common Failure Modes
Expert tips
- 💡 6×S50ME-GI10: Better vibration behaviour than 5 cylinders — more stable gas/diesel switchover operation
- 💡 6 cylinders at 500 mm: Piston overhaul possible on board — inspect the gas injection valves at the same time
- 💡 Test HP compressor redundancy regularly in operation
Related components
Classification & regulatory
IMO Tier II/III. IGC Code. SOLAS. MARPOL — LNG SOx-free, CO2 -25%.
Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.
Other Cylinder Configurations 36
Components & Design
Component data being added…
Technical Data
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