Wär Tsilä 20DF

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Wärtsilä 20DFPRODUCT GUIDE

Copyright by WÄRTSILÄ FINLAND OyCOPYRIGHT 2020 by WÄRTSILÄ FINLAND OyAll rights reserved. No part of this booklet may be reproduced or copied in any form or by any means (electronic,mechanical, graphic, photocopying, recording, taping or other information retrieval systems) without the prior writtenpermission of the copyright owner.THIS PUBLICATION IS DESIGNED TO PROVIDE AN ACCURATE AND AUTHORITATIVE INFORMATION WITHREGARD TO THE SUBJECT-MATTER COVERED AS WAS AVAILABLE AT THE TIME OF PRINTING. HOWEVER,THE PUBLICATION DEALS WITH COMPLICATED TECHNICAL MATTERS SUITED ONLY FOR SPECIALISTS IN THEAREA, AND THE DESIGN OF THE SUBJECT-PRODUCTS IS SUBJECT TO REGULAR IMPROVEMENTS,MODIFICATIONS AND CHANGES. CONSEQUENTLY, THE PUBLISHER AND COPYRIGHT OWNER OF THISPUBLICATION CAN NOT ACCEPT ANY RESPONSIBILITY OR LIABILITY FOR ANY EVENTUAL ERRORS OROMISSIONS IN THIS BOOKLET OR FOR DISCREPANCIES ARISING FROM THE FEATURES OF ANY ACTUAL ITEMIN THE RESPECTIVE PRODUCT BEING DIFFERENT FROM THOSE SHOWN IN THIS PUBLICATION. THE PUBLISHERAND COPYRIGHT OWNER SHALL UNDER NO CIRCUMSTANCES BE HELD LIABLE FOR ANY FINANCIALCONSEQUENTIAL DAMAGES OR OTHER LOSS, OR ANY OTHER DAMAGE OR INJURY, SUFFERED BY ANYPARTY MAKING USE OF THIS PUBLICATION OR THE INFORMATION CONTAINED HEREIN.

Wärtsilä 20DF Product GuideIntroductionIntroductionThis Product Guide provides data and system proposals for the early designphase of marine engine installations. For contracted projects specificinstructions for planning the installation are always delivered. Any data andinformation herein is subject to revision without notice. This 1/2020 issuereplaces all previous issues of the Wärtsilä 20DF Product r Automation System updated, other minor updates.1/201905.04.2019Chapter Automation System updated, other minor updates.2/201821.12.2018Technical data section updated. Other minor updates.1/201817.9.2018Technical data section updated. Other minor updates.3/201613.09.2016Technical data updated2/201620.05.2016Cetane index for pilot fuel oils added1/201618.03.2016Performance data update. Other minor updates.1/201527.02.2015Updates throughout the product guide1/201319.12.2013Information for W20DF engines with cylinder output 185kW addedWärtsilä, Marine BusinessVaasa, August 2020DAAB605808iii

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Wärtsilä 20DF Product GuideTable of contentsTable of contents1. Main Data and Outputs .1.1 Technical main data .1.2 Maximum continuous output .1.3 Output limitations in gas mode .1.4 Reference conditions .1.5 Operation in inclined position .1.6 Principal dimensions and weights .1-11-11-11-21-41-41-52. Operating Ranges .2.1 Engine operating modes .2.2 Engine operating range .2.3 Loading capacity .2.4 Low load operation .2.5 SCR Operation .2.6 Low air temperature .2-12-12-12-52-92-92-93. Technical Data .3.1 Introduction .3-13-14. Description of the Engine .4.1 Definitions .4.2 Main components and systems .4.3 Expected Technical Life Time .4.4 Engine storage .4-14-14-14-74-95. Piping Design, Treatment and Installation .5.1 Pipe dimensions .5.2 Trace heating .5.3 Pressure class .5.4 Pipe class .5.5 Insulation .5.6 Local gauges .5.7 Cleaning procedures .5.8 Flexible pipe connections .5.9 Clamping of pipes .5-15-15-25-25-35-45-45-45-65-76. Fuel System . 6-16.1 Acceptable fuel characteristics . 6-16.2 Operating principles . 6-96.3 Fuel gas system . 6-106.4 Fuel oil system . 6-207. Lubricating Oil System . 7-17.1 Lubricating oil requirements . 7-17.2 Internal lubricating oil system . 7-37.3 External lubricating oil system . 7-57.4 Crankcase ventilation system . 7-107.5 Flushing instructions . 7-118. Compressed Air System .8.1 Instrument air quality .8.2 Internal compressed air system .8.3 External compressed air system .DAAB6058088-18-18-28-4v

Table of contentsWärtsilä 20DF Product Guide9. Cooling Water System .9.1 Water quality .9.2 Internal cooling water system .9.3 External cooling water system .9-19-19-29-510. Combustion Air System . 10-110.1 Engine room ventilation . 10-110.2 Combustion air system design . 10-311. Exhaust Gas System .11.1 Internal exhaust gas system .11.2 Temperature sensor location after Turbocharger .11.3 Exhaust gas outlet .11.4 External exhaust gas system .11-111-111-211-411-512. Turbocharger Cleaning . 12-112.1 Turbine cleaning system . 12-112.2 Compressor cleaning system . 12-113. Exhaust Emissions .13.1 Dual fuel engine exhaust components .13.2 Marine exhaust emissions legislation .13.3 Methods to reduce exhaust emissions .13-113-113-113-114. Automation System . 14-114.1 UNIC 6-series . 14-115. Foundation .15.1 Steel structure design .15.2 Mounting of main engines .15.3 Mounting of generating sets .15.4 Flexible pipe connections .15-115-115-115-615-816. Vibration and Noise .16.1 External forces & couples .16.2 Mass moments of inertia .16.3 Air borne noise .16.4 Exhaust noise .16-116-116-416-416-417. Power Transmission .17.1 Flexible coupling .17.2 Torque flange .17.3 Clutch .17.4 Shaft locking device .17.5 Power-take-off from the free end .17.6 Input data for torsional vibration calculations .17.7 Turning gear .17-117-117-217-217-217-317-417-518. Engine Room Layout .18.1 Crankshaft distances .18.2 Space requirements for maintenance .18.3 Transportation and storage of spare parts and tools .18.4 Required deck area for service work .18-118-118-218-318-319. Transport Dimensions and Weights . 19-119.1 Lifting of engines . 19-119.2 Engine components . 19-220. Product Guide Attachments . 20-1viDAAB605808

Wärtsilä 20DF Product GuideTable of contents21. ANNEX . 21-121.1 Unit conversion tables . 21-121.2 Collection of drawing symbols used in drawings . 21-2DAAB605808vii

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Wärtsilä 20DF Product Guide1. Main Data and Outputs1.Main Data and Outputs1.1Technical main dataThe Wärtsilä 20DF is a 4-stroke, non-reversible, turbocharged and inter-cooled dual fuel enginewith direct injection of liquid fuel and indirect injection of gas fuel. The engine can be operatedin gas mode or in diesel mode.Cylinder bore . 200 mmStroke . 280 mmPiston displacement . 8.8 l/cylNumber of valves . 2 inlet valves and 2 exhaust valvesCylinder configuration . 6, 8 and 9 in-lineDirection of rotation . clockwise, counterclockwise on requestSpeed . 1000, 1200 rpmMean piston speed . 9.3, 11.2 m/s1.2Maximum continuous outputTable 1-1Rating table for Wärtsilä 20DFMain EnginesEngine typeGenerating sets1200 rpm1000 rpm1200 rpmkWBHPEngine [kW]Generator[kVA]Engine [kW]Generator[kVA]Wärtsilä 6L20DF11101510960115011101330Wärtsilä 8L20DF148020101280154014801780Wärtsilä 9L20DF166522601440173016652000The mean effective pressure Pe can be calculated using the following formula:where:Pe mean effective pressure [bar]P output per cylinder [kW]n engine speed [r/min]D cylinder diameter [mm]L length of piston stroke [mm]c operating cycle (4)DAAB6058081-1

1. Main Data and OutputsWärtsilä 20DF Product Guide1.3Output limitations in gas mode1.3.1Output limitations due to methane numberDerating factor (KKNOCK)Methane Number, [MN]Notes:For the engine to be able to run 100% load ingas the methane number must be 80 or above,it is however possible to run the engine on gaseswith lower methane number at a reduced output,the maximum output that can be taken out ofthe engine when running on lower methanenumber gas is according to above curve. Goingabove this curve will lead knocking and trip todiesel mode, so if gas mode to be insured whenoperating on lower methane gas, the above isto be considered in the vessels PMS system.The dew point shall be calculated for the specificsite conditions. The minimum charge air temperature shall be above the dew point, otherwisecondensation will occur in the charge air cooler.Minimum charge air receiver 45 C is recommended.The charge air temperature is approximately 5 C higher than the charge air coolant temperatureat rated load.Glycol usage in cooling water according tochapter 9 "Cooling Water System".1-2DAAB605808

Wärtsilä 20DF Product Guide1.3.21. Main Data and OutputsOutput limitations due to gas feed pressure and lowerheating valueFig 1-1Output limitation due to gas feed pressure and LHVNotes:The above given values for gas feed pressureare at engine inlet (before the gas filter).No

Maximum 6 hours if the engine is to be loaded after the idling. No idling restrictions for 1000/1200rpm engines. Operationbelow37kW/cyl 1) loadonHFOorbelow18.5kW/cyl 2) loadonMDForgas:

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