Wärtsilä 50DF marine engine

Engine Summary

Power Range: 5,850–17,550 kW
Speed Range: 500–514 rpm
Fuel Type: Natural gas, MDO, HFO
Cylinder Configuration: 6L, 8L, 9L, 12V, 16V, 18V
Max Power: 17550

Engine Information

Engine Family: Wärtsilä 50DF

Engine Type: Dual Fuel Engine

Description

The Wärtsilä 50DF is a high-output, medium-speed dual-fuel marine engine designed for large vessels and demanding propulsion and power-generation applications. It supports operation on natural gas and liquid marine fuels, including marine diesel oil (MDO) and heavy fuel oil (HFO), providing operational flexibility across different fuel and operating conditions.

The engine combines dual-fuel combustion technology with high thermal efficiency, reliable power delivery, and robust mechanical construction. Its design supports efficient fuel utilization, reduced exhaust emissions, and stable operation across varying load profiles.

The Wärtsilä 50DF is suitable for applications including LNG carriers, offshore vessels, cruise ships, and large power-generation installations. Its configuration, performance, fuel consumption, and emission characteristics depend on engine rating, fuel specification, operating conditions, and installation requirements.

Learn more on the official Wärtsilä website

Compatible Filters

Specifications

Rated Speed: 500–514 rpm
Fuel Consumption: Configuration-dependent

Dimensions & Weight

Compliance

Emission Standards:
IMO Tier II in liquid-fuel operation; IMO Tier III in gas mode.
MARPOL Annex VI: Designed to comply with applicable MARPOL Annex VI NOx emission requirements, subject to engine configuration and applicable emission-control systems.
Certifications: DNV, ABS, Lloyd’s Register, Bureau Veritas, RINA and CCS; certification subject to engine configuration and project requirements.

Accessories

Standard Accessories

Engine-Driven Pump Systems — Engine-driven lubrication-oil, cooling-water, and fuel-system pumps for normal engine operation.

Charge-Air Cooling System — Charge-air cooler and associated piping for controlled intake-air temperatures.
Turbocharging System — High-efficiency turbocharger matched to the engine rating and operating profile.
Gas Admission System — Standard gas-admission equipment and associated safety and control components for gas operation.
Pilot-Fuel System — Fuel-injection equipment and associated components required for dual-fuel operation and gas-mode ignition.
Starting-Air System — Starting-air distributor, starting valves, and associated safety equipment.
UNIC Control and Monitoring System — Integrated engine-control, monitoring, protection, and diagnostic functions.
Exhaust System Components — Exhaust manifold, turbocharger interfaces, and applicable thermal insulation.
Engine Instrumentation — Standard sensors and instrumentation for monitoring key engine operating parameters.
Flexible Mounting Arrangements — Standard mounting and vibration-control components according to engine configuration and installation requirements.
Safety and Shutdown Systems — Overspeed protection, emergency-stop functions, alarms, and essential engine-protection devices.
Lubrication and Fuel Filtration Equipment — Standard lubrication-oil and fuel-oil filtration systems for reliable engine operation.

Optional Accessories

Additional Fuel-Gas Filtration — Enhanced gas-filtration equipment may be configured according to fuel-gas quality and vessel requirements.

Redundant Lubrication-Oil Pumps — Additional or redundant lubrication-oil pumps may be specified to increase system availability.
Electric Pre-Lubrication Pump — Additional pre-lubrication equipment may be configured to support lubrication before engine start.
Enhanced Starting-Air Equipment — Additional starting-air receivers and associated equipment may be specified according to starting requirements.
Advanced Vibration and Condition Monitoring — Additional sensors and monitoring equipment may be configured for condition-based maintenance.
Exhaust-Gas Insulation Packages — Additional thermal insulation may be specified for exhaust-system components according to vessel safety and installation requirements.
Fuel-Changeover Automation — Additional automation functions may be configured to support controlled switching between gas and liquid-fuel operation.
Remote Control and Monitoring Interfaces — Additional control interfaces may be configured for ECR, bridge, remote-monitoring, and vessel automation integration.
Jacket-Water Heating Systems — Additional heating and pre-heating equipment may be specified for cold-start and low-temperature operating conditions.
Alternative Turbocharger Configurations — Turbocharging-system configurations may be adapted according to engine rating, load profile, and operating conditions.
Extended Service Tooling — Additional maintenance and service tools may be supplied according to vessel and service requirements.
Hybrid-System Integration — Interfaces and associated equipment may be configured for battery systems, shaft generators, hybrid propulsion, and vessel power-management systems.

Warranty

Warranty Period: As specified in the Wärtsilä sales contract and applicable warranty documentation.
Warranty Conditions: Subject to compliance with Wärtsilä’s installation, commissioning, operating, maintenance, fuel-quality, and service requirements.

Additional Notes

Configuration-Dependent Performance — Performance, fuel efficiency, and emission levels may vary depending on ambient conditions, fuel quality, engine configuration, load profile, and vessel-specific integration.

Maintenance and Reliability — Regular condition monitoring and adherence to applicable maintenance schedules support reliable long-term operation.

Service and Spare Parts — The use of approved spare parts, lubricants, and applicable service procedures supports engine reliability and lifecycle performance.

Digital Monitoring — Extended service and remote-monitoring solutions may be configured to support condition monitoring, diagnostics, and operational management.