Wärtsilä X35

BSFC: -1 g/kWh with FAST nozzle.

Dimensions and weights

• All dimensions are in millimetres and are not binding.
• F1: Min height for vertical removal
• F2: Min height for vertical removal with double-jib crane
• F3: Min height for tilted removal with double-jib crane
• The engine weight is net in metric tonnes (t), without oil and water, and is not binding

Fuel consumption

• All brake specific fuel consumptions (BSFC) are quoted for fuel of lower calorific value 42.7 MJ/kg, and for ISO standard reference conditions(ISO 15550 and 3046).
• All given BSFC figures for Wärtsilä engines are given with a tolerance of +5% across 40–100% of engine load.

For the Wärtsilä engines X62, X72, X82, X92 and RT-flex58T-D ER-3, stepwise tolerances have been introduced for the brake specific fuel consumption (BSFC):

• 5% tolerance for 100% to 85% engine load
• 6% tolerance for 84% to 65% engine load
• 7% tolerance for 64% to 25% engine load

Standard Tuning, Delta Tuning, Low Load Tuning are available for the electronically-controlled common- rail engines providing optimum fuel consumption and flexibility for different engine loads.Delta Tuning focuses on reducing fuel consumption in the operating range below 90% engine load. Low Load Tuning reduces fuel consumption below 75% engine load.

Typical BSFC curves
to illustrate Standard Tuning, Delta Tuning and Low-Load Tuning

Rating points for Wärtsilä low-speed engines

The engine layout fields for Wärtsilä low-speed engines are defined by the power/ speed rating points R1, R2, R3 and R4 (see diagram). In certain engines, the layout field is extended to the points R1+ and R2+.

R1, or R1+ instead if applicable, is the nominal maximum continuous rating (MCR). Any power and speed within the respective engine layout field may be selected as the Contract-MCR (CMCR) point for an engine.

ISO standard reference conditions

• Total barometric pressure at R1: 1.0 bar
• Suction air temperature: 25 °C
• Relative humidity: 30%
• Scavenge air cooling water temperature: 25 °C

Emissions

All Wärtsilä low-speed engines are fully compliant with IMO Tier II NOx limits specified in Annex VI of the MARPOL 73/78. They can also be equipped with a SCR catalyst to meet IMO Tier III NOx emission levels and a scrubber to reduce SOx emissions to 0.1% – even with high sulphur fuels.

Cylinder Lubrication

The Pulse Lubricating System with electronic control of lubrication timing has been further developed. The guide feed rate for new engines equipped with the Pulse Jet cylinder lubrication system is 0.6 g/kWh. Engines with different lubricating systems might require a higher feed rate. This allows important savings in engine operating costs.