5S50ME-GI10
The MAN 5S50ME-GI10 is a 5‑cylinder, low‑speed 2‑stroke dual‑fuel main engine delivering up to 18 650 kW at 127 rpm, notable for its high‑pressure (≈300 bar) gas injection and instant HFO/LNG switch.
Engine Specifications
Inspector Detail
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Designation decoded
5 stands for 5 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 is the newest Mark 10 version of the 50 series ME-GI. High-pressure gas injection at 300 bar within the diesel cycle. For LNG carriers. Mark 10 as the latest generation with improved electronics.
Calculated metrics
Inspector checklist
- Cylinder liners: S/B 4.0 — side forces, LNG cold corrosion wear
- Piston rings: Gas lubrication conditions
- Cylinder lubrication: BN25 in gas operation
- Gas injection valves: 300 bar tightness
- HP compressor: Condition and redundancy
- Gas detectors: Calibration (methane at the top)
- ME control: FIVA, HPS/HCU, EICU
- Gas/diesel changeover
- Safety logic
- Scavenge air box: Clean in LNG operation
- Turbocharger: Less fouling with gas
- Exhaust temperature
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Exhaust temperature by cylinder | 310–370 °C (LNG); 350–420 °C (diesel) | Spread >15 °C → check gas/pilot |
| Gas injection pressure | 280–320 bar | Deviation → HP compressor/valve |
| Pmax | ±2 bar | Deviation → control system |
| Pilot fuel share | 3–8% | Deviation → efficiency |
Common Failure Modes
Expert tips
- 💡 Mark 10 ME-GI offers improved electronics over Mark 8.5 — check and implement software updates from MAN
- 💡 5 cylinders on S50: Torsional vibrations at certain speeds — observe Barred Speed Range, especially during gas/diesel changeover
- 💡 HP compressor redundancy is essential on LNG carriers — regularly test the backup compressor in operation
Related components
Classification & regulatory
IMO Tier II/III. IGC Code. SOLAS. MARPOL — LNG nearly 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
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Technical Data
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