S60ME-GI
The MAN Energy Solutions S60ME-GI is a low‑speed, two‑stroke dual‑fuel main engine that injects gas directly into the cylinder, offering flexible operation on LNG and conventional marine fuels.
Engine Specifications
Inspector Detail
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Designation decoded
S for super-long-stroke, 60 for bore 600 mm, ME for electronic control, GI for gas injection — high-pressure LNG dual-fuel at 250–350 bar in diesel cycle.
Background
The S60ME-GI combines the most widely built mid-range two-stroke with high-pressure LNG dual-fuel. Primary application on LNG-powered container feeders, Panamax bulkers and mid-size tankers. GI technology (diesel cycle, zero methane slip) is the standard for LNG carriers and is increasingly transferred to other ship types.
Calculated metrics
Inspector checklist
- Zylinderlaufbuchse: 600 mm Bohrung — Verschleißprofil, Liner-Polishing-Risiko im GI-Modus beobachten
- Kolbenringe: Saubere GI-Verbrennung → fehlende abrasive Partikel = Polishing-Gefahr
- Crosshead bearing: Standard S60 loading — bearing clearance and condition
- FIVA-Ventile: GI-spezifische Steuerung — Druck, Timing, Leckage
- HPS: Kapazität für duale Steuerung
- PMI-Online: Diesel vs. GI Verbrennungskurven vergleichen
- GVU: Block-and-Bleed-Test pro Zylinder
- HP compressors: vibration, oil analysis, valve plates — typically 2-3× at S60
- Gasinjektionsventile: Düsenerosion, Verkokung, Bohroskopie
- Doppelwandige Leitungen: Annulus-HC-Monitoring
- HC-Detektoren: Kalibrierung aller Sensoren
- ESD: gas trip and diesel fallback testing
- Ventilation: IGF-Code Compliance
- Gasinjektions-Dichtungen: Sicherheitskritisch — Undichtigkeit = Gas-Trip
- Stopfbuchse: Standard-Drainage-Überwachung
- Exhaust valve: sealing ring and spindle
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Exhaust gas temperature per cylinder | 350–420 °C at 85 % MCR | Spread >20 °C → gas injection valve or pilot nozzle |
| HP-Gasdruck | 250-350 bar | Druckinstabilität → HP-Kompressor |
| Pilot-Fuel-Anteil | 2-5% | Anstieg → GI-Problem, Zylinder-Diesel-Fallback |
| Scavenge Air Pressure | 2.5-3.5 bar abs at MCR | Zu niedrig → Turbolader |
| Zylinderöl-Feed-Rate | 0.5-0.8 g/kWh (GI-Modus) | Gas-Motor-Öl mit niedriger BN |
Common Failure Modes
Expert tips
- 💡 Der S60ME-GI ist der volumenstärkste GI-Motor der Mittelklasse — breite Erfahrungsbasis nutzen, MAN PrimeServ hat umfangreiche Fleet-Daten
- 💡 HP compressor maintenance is the largest cost factor in GI operation — compressor condition determines the economics of LNG operation
- 💡 In GI mode at slow steaming: below 25% MCR switch to diesel — GI efficiency drops and pilot fraction increases uneconomically
Related components
Classification & regulatory
IMO Tier III im GI-Modus. IGF-Code. EEDI Phase 2/3 konform. CII-Vorteil: LNG-GI = 20-25% CO2-Reduktion ohne Methanschlupf.
Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.
Components & Design
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Technical Data
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Common failures & inspection points
Service & Maintenance
Gas injection and pilot fuel systems require maker-defined leak testing and overhaul intervals. Scavenge and drain-oil based condition monitoring remains essential.
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