Wärtsilä RT-flex68 / RTA68

Dimensions mm	B	C	D	E
	4 320	1 520	10 400	4 700
	F1	F2	F3	G
	12 545	*	12 014	2 340

BSFC: - 1 g/kWh with FAST nozzle.
* on request.

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.

Conditions for use
The 2D and 3D models and drawings downloaded (”Marine Solutions Drawings”) are for general guidance purposes only and should not be used for actual projects. Models and drawings for specific projects must be obtained from the appropriate Wärtsilä personnel as there may be deviations from the Downloadable Files.

File formats
File formats supported include DXF and PDF for 2D models and IGES, STEP, DXF, SAT and WRML for 3D models. A 2D DXF or PDF should always be used to support the 3D models. The Downloadable Files are subject to changes or improvements by Wärtsilä without notification so please check regularly for new and updated files at www.wartsila.com.

Liability
Wärtsilä takes no responsibility for and disclaims any liability for the contents of the Downloadable Files, including but not limited to omissions, errors, deficiencies, inaccuracies contained therein, and the use or misuse thereof. In no event, shall Wärtsilä be liable for any consequential, special, contingent, or incidental damages or injury, financial or otherwise, suffered by any party arising out of, connected with, or resulting from the use of the Downloadable Files or the information contained therein.

Copyright
This website contains information, which is owned by or licensed to Wärtsilä. Wärtsilä shall retain all rights, including copyrights, relating to the information in the Downloadable Files. Reproduction or transmission to third parties is prohibited without prior written approval of Wärtsilä. Copyright © Wärtsilä.

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