Wärtsilä Equipment
Wärtsilä 25 Marine Engine
Medium-speed marine engine in diesel, LNG (DF or NextDF) and ammonia versions; 6L–9L, 1.9–3.4 MW at 900/1000 rpm, TBO up to 32,000 h, methane slip as low as 0.9% with NextDF.
Description
The Wärtsilä 25 is a medium-speed marine engine designed for fuel flexibility and easy integration into mechanical, diesel-electric and hybrid propulsion. Its modular design enables conversion to future fuels.
Technical data
- Power range: 1.9 – 3.4 MW
- Configurations: 6L – 9L
- Nominal speed: 900 or 1000 rpm
- Fuels: diesel, LNG (standard DF or NextDF), ammonia; compatible with biofuels
- Time between overhaul (TBO): up to 32,000 h
Emissions and compliance
- IMO Tier III natively in LNG mode; with Wärtsilä NOR when running on diesel or ammonia
- NextDF: methane slip as low as 0.9% and efficiency gain up to 0.5 percentage points; meets current FuelEU Maritime requirements
- Ammonia version: up to 90% GHG reduction at 95% ammonia energy share, with integrated safety systems and Wärtsilä AmmoniaPac
Integration
- Compatible with Wärtsilä NOx Reducer (NOR), LNGPac and AmmoniaPac fuel supply systems
- Hybrid operation with batteries for optimal engine loading
- Smart propulsion control such as EcoControl
Applications
- Small merchant and short-sea cargo vessels
- LNG bunkering vessels (e.g. Ibaizabal, with 25DF NextDF)
- PSVs, including ammonia conversion (Viking Energy)
- Fishing vessels
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