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MAN Energy Solutions

8S90ME-GI10

Name: MAN Energy Solutions 8S90ME-GI10
Brand: MAN Energy Solutions
SKU: OSE-38365

The MAN 8S90ME-GI10 is an eight‑cylinder, low‑speed two‑stroke dual‑fuel engine delivering up to 102 960 kW at 76 rpm, featuring high‑pressure (300 bar) gas injection for near‑zero methane slip and instant switching between HFO/MDO and LNG.

102960.0 kW

Power

Engine Specifications

Cylinders

900 mm

Bore

3260 mm

Stroke

102,960 kW

MCR Power

76.0 rpm

MCR RPM

2-stroke

Stroke Type

Family: MAN Energy Solutions ME-GI · Tier: Tier III · Fuel: HFO, VLSFO, MDO, LNG

Inspector Detail ✓ verified

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Designation decoded

8-cylinder, S-type (Super-Long-Stroke), 90 cm bore, ME-GI Mark 10 — electronically controlled two-stroke crosshead engine with high-pressure LNG gas injection (300 bar, diesel cycle)

Background

The 8S90ME-GI10 is one of the largest ME-GI engines in the MAN programme, with a 900 mm bore and a stroke-to-bore ratio of 3.62 for Ultra-Large Container Ships (ULCS) and large tankers. The enormous per-cylinder output requires particularly powerful HP compressors and gas injection valves. The 8-cylinder configuration offers the best mass balancing in this power class.

Calculated metrics

Stroke To Bore Ratio

3.62

Mean Effective Pressure Bar

21.5

Inspector checklist

HP Gas Compressor System

HP compressor capacity for 8 cylinders at 900 mm bore — high gas throughput required
300 bar output pressure — leak test on all high-pressure connections
Check compressor redundancy and changeover to standby
Oil separator, vibration monitoring and bearing temperatures
Safety valves and emergency shutdown

Gas Injection Valves and Gas Supply

300 bar leak test on all 8 cylinders
Valve seats, nozzle bores — erosion and coking with large nozzle cross-sections
Double-wall piping system — increased attention due to large pipe diameters
Gas pressure control for high flow rate

Gas Detection System

Methane detectors in ceiling areas of all enclosed spaces
Increased number of detectors due to large engine room volume
Calibration, 20%/40% LEL alarm thresholds, redundancy

FIVA / HPS / HCU / EICU

FIVA valves — higher hydraulic forces with large bore
HPS pump capacity sufficient for 8 large cylinders
HCU tightness and wear
EICU software and parameters up to date

Cylinder, Piston and Liners

BN25 cylinder oil in gas operation — feed rate for 900 mm bore
Liner wear measurement — large bore means large circumference, more measurement points
Piston crown inspection — thermal loading at 90 cm diameter
Exhaust gas temperatures: gas 310–370 °C, diesel 350–420 °C

Foundation and Structural Integrity

Engine mounting and foundation bolts — high inertia forces at 90 cm bore
Check crankcase inspection openings for cracks
Bedplate alignment and shaft line alignment

Logbook reference values

Parameter	Expected	Deviation means
Exhaust gas temperature per cylinder (gas operation)	310–370 °C	Deviations indicate combustion or injection problems.
Exhaust gas temperature per cylinder (diesel operation)	350–420 °C	Spread >30 °C requires root cause analysis on the affected cylinders.
HP compressor output pressure	280–310 bar	Particularly critical for the 90 class due to high gas volumes — investigate any pressure drop immediately.
Scavenge pressure	3.0–4.2 bar	Low scavenge pressure at large bore quickly leads to thermal overload.
Compression pressures	130–155 bar	Deviation >5 bar below reference = piston ring or valve problem.
Max. firing pressure (Pmax)	170–200 bar	Evenness across all 8 cylinders essential for bearing protection.
Cylinder oil feed rate (BN25)	0.6–0.8 g/kWh	With a large bore, the same specific rate means significantly higher absolute consumption.
Crankcase oil mist	no visible mist, oil mist detectors within normal range	Oil mist alarm indicates a hot spot in the crankcase — immediate load reduction and inspection.

Common Failure Modes

HP compressor overload

Symptoms: ['Compressor does not reach target pressure', 'Elevated stage temperatures', 'Frequent compressor trips']

Causes: Undersizing for full-load operation, Valve plate wear, Charge air cooler fouling reduces intake air quality

Preventive: Compressor performance test at full load, replace valve plates per manufacturer interval, regularly test the redundant compressor under load.

Gas injection valve failure

Symptoms: ['Gas alarm', 'Exhaust gas temperature deviation', 'Loss of power']

Causes: Erosion of the large nozzle cross-sections, Thermal fatigue, Coking

Preventive: Shortened inspection intervals for the 90 cm class due to higher thermal loading.

Liner cloverleafing

Symptoms: ['Out-of-round liner wear', 'Increased cylinder oil consumption', 'Increased blow-by']

Causes: Uneven thermal expansion, Piston ring compatibility, Insufficient cylinder oil distribution over the large circumference

Preventive: Regular wear measurement at multiple levels and directions, check cylinder oil quills for even distribution.

Foundation cracks

Symptoms: ['Crack indications during NDT inspection', 'Alignment problems', 'Abnormal vibrations']

Causes: High dynamic forces from the large bore, Corrosion on the bedplate, Insufficient foundation stiffness

Preventive: NDT inspection of critical areas during docking, check foundation bolt torque.

Expert tips

💡 The 8S90ME-GI10 has the lowest S/B ratio in this GI series at 3.62 — this means higher specific output per stroke, but also higher mechanical stress on the running gear.
💡 At 900 mm bore, the absolute gas quantity per cylinder is enormous — HP compressor capacity and redundancy are even more critical than with smaller bores.
💡 Check shaft line alignment when ship loading changes — large engines respond more strongly to hull deformation.

Related components

Turbocharger (likely 2 units for 8 cylinders) Charge air cooler Exhaust valves and spindle seals Piston rings and liners Crosshead and connecting rod bearings Main bearing Fuel booster module LNG tank system and vaporiser Engine room ventilation Shaft line and propeller

Classification & regulatory

Increased requirements from classification societies apply to the 8S90ME-GI10 as one of the largest GI units. HAZID/HAZOP studies are mandatory for the gas installation. Extended monitoring requirements per IGF Code Chapters 6 and 9. Special attention to emergency changeover at this power class.

Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.