Wärtsilä 31 Marine Engine
Engine Summary
- Power Range: 4,880–9,760 kW (main engines, 750 rpm); 4,720–9,760 kW (generating sets, 720/750 rpm)
- Speed Range: 720–750 rpm (main engines: 750 rpm)
- Fuel Type: Heavy fuel oil and distillate fuels (diesel version); ISO 8217 up to RMK 700
- Cylinder Configuration: 8V, 10V, 12V, 14V, 16V (50° V-angle)
- Max Power: 9,760 kW (16V31, 750 rpm, main engine)
Engine Information
Engine Family: Wärtsilä 31
Engine Type: Diesel Engine
Description
The Wärtsilä 31 is a medium-speed marine engine used for main propulsion, in diesel-electric and hybrid installations, and as an auxiliary engine. It is built in V-configuration with 8 to 16 cylinders and is offered in diesel, dual-fuel (31DF) and pure gas (31SG) versions; a 20-cylinder version exists for power plants.
According to Wärtsilä, the engine offers low fuel consumption over a wide operating range. It uses the UNIC engine control system, an advanced fuel injection system and variable valve timing. Its modular design, with exchange units such as power units, injectors and high-pressure fuel pumps, is intended to shorten maintenance time.
Compatible Filters
Specifications
- Rated Speed: 750 rpm (main engines); 720 / 750 rpm (generating sets)
- Fuel Consumption: 171.6–171.7 g/kWh at 85 % load, 750 rpm, main engine, HFO, IMO Tier 2 (8V31 to 16V31)
Dimensions & Weight
- Length: 6,114 / 6,754 mm (8V31 / 10V31); with turbocharger at flywheel end: 6,175 / 6,813 mm
- Width: 3,113 mm (8V31, 10V31)
- Height: 3,205 mm from crankshaft centreline to highest point (8V31, 10V31)
Compliance
- Emission Standards:
IMO Tier II. According to Wärtsilä, the diesel version meets IMO Tier III with an SCR system. The dual-fuel (31DF) and gas (31SG) versions meet IMO Tier III in gas mode.
- Certifications: Emission certification is engine- and project-specific. Please refer to Wärtsilä for certificates applicable to a specific engine.
Accessories
Standard Accessories
- Lubricating oil system with engine-driven main pump, electrically driven prelubricating pump, thermostatic valve, automatic filter and oil cooler (integrated module)
- Two-circuit fresh water cooling (high-temperature and low-temperature circuits) with engine-driven pumps
- Turbocharged charge air system with a low-pressure two-stage and a high-pressure one-stage charge air cooler
- Electronic fuel injection with high-pressure pumps (number depends on cylinder configuration), installed in a hotbox
- Insulated exhaust gas system (mineral wool panels)
- Compressed air starting system; nominal pressure 30 bar, minimum 15 bar at the engine during start (20 °C); air consumption per start approx. 4.9 Nm³ (8V31), 5.8 Nm³ (14V31), 6.3 Nm³ (16V31)
- Wärtsilä UNIC engine control system with hardwired control interface and bus interface for alarm and monitoring
Optional Accessories
According to Wärtsilä, the Wärtsilä 31 diesel version meets IMO Tier III NOx requirements when combined with an SCR system. The engine is also offered as dual-fuel (31DF) and pure gas (31SG) version. Wärtsilä states that engines can be converted to other fuels without machining. Wärtsilä additionally offers Service Agreements, Asset Performance Services and Online Services.
Warranty
- Warranty Conditions: Warranty terms are agreed individually with the supplier and depend on the specific project. Please contact Wärtsilä or an authorised distributor for details.
Additional Notes
The data on this page refers to the diesel version of the Wärtsilä 31 and is taken from the Wärtsilä 31 Product Guide (Issue a1, 18 October 2016) and the Wärtsilä 31 product brochure (2019). Wärtsilä may change specifications without notice. Engine specifications and configuration may vary depending on vessel type, application, operating conditions and installation requirements. The engine is also offered as dual-fuel (31DF) and pure gas (31SG) version.
Fuel consumption values apply at ISO 15550 reference conditions with a tolerance of 5 %. Fuel quality, load profile and ambient conditions influence actual consumption. Refer to Wärtsilä technical documentation for detailed installation, operating, maintenance and service requirements.
Sources
- Wärtsilä 31 Product Guide, Issue a1, 18 October 2016: output, speeds, bore and stroke, cylinder configurations (Section 1.1); dimensions of the 8V31 and 10V31 (Section 1.4); fuel consumption of the 8V31 to 16V31 and starting air data of the 8V31, 14V31 and 16V31 (Chapter 3, Technical Data); engine systems and components (Chapter 4, Sections 4.2.11 to 4.2.15).
- Wärtsilä 31 product brochure, September 2019: applications, fuel specification, cylinder output, UNIC control system, modular design, IMO Tier III statements, service offerings.
Values refer to the diesel version of the Wärtsilä 31 unless stated otherwise. Statements about efficiency and performance are manufacturer claims. Specifications are subject to change without notice.