Wartsila 50DF PG

8/20/2019 Wartsila 50DF PG

1/182

WÄRTSILÄ 50DFPRODUCT GUIDE


2/182


3/182

IntroductionThis Product Guide provides data and system proposals for the early design phase of marine engine install-ations. For contracted projects specific instructions for planning the installation are always delivered. Anydata and information herein is subject to revision without notice. This 2/2010 issue replaces all previousissues of the Wärtsilä 50DF Project Guides.

UpdatesPublishedIssue

Chapters Technical data, Product Guide Attachments (InfoBoard version) have beenupdated and other minor updates throughout the product guide

14.06.20102/2010

IMO Tier 2 engines added, mechanical propulsion added and numerous updatesthroughout the product guide

21.05.20101/2010

Chapter Compressed air system updated28.06.20074/2007

Wärtsilä, Ship Power Technology

Vaasa, June 2010

THIS PUBLICATION IS DESIGNED TO PROVIDE AS ACCURATE AND AUTHORITATIVE INFORMATION REGARDING THE SUBJECTS COVERED ASWAS AVAILABLE AT THE TIME OF WRITING. HOWEVER, THE PUBLICATION DEALS WITH COMPLICATED TECHNICAL MATTERS AND THE DESIGNOF THE SUBJECT AND PRODUCTS IS SUBJECT TO REGULAR IMPROVEMENTS, MODIFICATIONS AND CHANGES. CONSEQUENTLY, THE PUB-LISHER AND COPYRIGHT OWNER OF THIS PUBLICATION CANNOT TAKE ANY RESPONSIBILITY OR LIABILITY FOR ANY ERRORS OR OMISSIONSIN THIS PUBLICATION OR FOR DISCREPANCIES ARISING FROM THE FEATURES OF ANY ACTUAL ITEM IN THE RESPECTIVE PRODUCT BEINGDIFFERENT FROM THOSE SHOWN IN THIS PUBLICATION. THE PUBLISHER AND COPYRIGHT OWNER SHALL NOT BE LIABLE UNDER ANY CIR-CUMSTANCES, FOR ANY CONSEQUENTIAL, SPECIAL, CONTINGENT, OR INCIDENTAL DAMAGES OR INJURY, FINANCIAL OR OTHERWISE,SUFFERED BY ANY PART ARISING OUT OF, CONNECTED WITH, OR RESULTING FROM THE USE OF THIS PUBLICATION OR THE INFORMATIONCONTAINED THEREIN.

COPYRIGHT © 2010 BY WÄRTSILÄ FINLAND Oy ALL RIGHTS RESERVED. NO PART OF THIS PUBLICATION MAY BE REPRODUCED OR COPIED IN ANY FORM OR BY ANY MEANS, WITHOUT PRIORWRITTEN PERMISSION OF THE COPYRIGHT OWNER.

Product Guide Wärtsilä 50DF - 2/2010 iii

Product GuideIntroduction


4/182

Table of Contents

11. Main Data and Outputs .............................................................................................................................11.1 Maximum continuous output ............................................................................................................21.2 Derating of output in gas mode ........................................................................................................41.3 Reference conditions ........................................................................................................................

41.4 Operation in inclined position ...........................................................................................................51.5 Dimensions and weights ..................................................................................................................

82. Operating ranges ......................................................................................................................................82.1 Engine operating range ....................................................................................................................92.2 Electric power generation .................................................................................................................92.3 Loading capacity ..............................................................................................................................

112.4 Low air temperature ........................................................................................................................112.5 Operation at low load and idling .......................................................................................................

123. Technical Data ...........................................................................................................................................123.1 Introduction .......................................................................................................................................133.2 Wärtsilä 6L50DF ...............................................................................................................................153.3 Wärtsilä 8L50DF ...............................................................................................................................173.4 Wärtsilä 9L50DF ...............................................................................................................................193.5 Wärtsilä 12V50DF ............................................................................................................................213.6 Wärtsilä 16V50DF ............................................................................................................................233.7 Wärtsilä 18V50DF ............................................................................................................................

254. Description of the Engine .........................................................................................................................254.1 Definitions .........................................................................................................................................254.2 Main components and systems ........................................................................................................304.3 Cross section of the engine ..............................................................................................................324.4 Free end cover .................................................................................................................................334.5 Overhaul intervals and expected life times .......................................................................................

345. Piping Design, Treatment and Installation ..............................................................................................345.1 Pipe dimensions ...............................................................................................................................355.2 Trace heating ....................................................................................................................................355.3 Operating and design pressure ........................................................................................................365.4 Pipe class .........................................................................................................................................365.5 Insulation ..........................................................................................................................................365.6 Local gauges ....................................................................................................................................375.7 Cleaning procedures ........................................................................................................................375.8 Flexible pipe connections .................................................................................................................385.9 Clamping of pipes .............................................................................................................................

406. Fuel System ...............................................................................................................................................

406.1 Acceptable fuel characteristics .........................................................................................................456.2 Operating principles .........................................................................................................................466.3 Fuel gas system ...............................................................................................................................526.4 Fuel oil system .................................................................................................................................

707. Lubricating Oil System .............................................................................................................................707.1 Lubricating oil requirements .............................................................................................................717.2 Internal lubricating oil system ...........................................................................................................747.3 External lubricating oil system ..........................................................................................................827.4 Crankcase ventilation system ...........................................................................................................837.5 Flushing instructions ........................................................................................................................

848. Compressed Air System ...........................................................................................................................848.1 Instrument air quality ........................................................................................................................848.2 Internal compressed air system .......................................................................................................878.3 External compressed air system ......................................................................................................

iv Product Guide Wärtsilä 50DF - 2/2010

Product GuideTable of Contents


5/182

909. Cooling Water System ..............................................................................................................................909.1 Corrosion inhibitors ..........................................................................................................................909.2 Glycol ...............................................................................................................................................919.3 Internal cooling water system ...........................................................................................................949.4 External cooling water system ..........................................................................................................

10410. Combustion Air System ........................................................................................................................... 10410.1 Engine room ventilation ....................................................................................................................10510.2 Combustion air system design .........................................................................................................

10711. Exhaust Gas System .................................................................................................................................10711.1 Internal exhaust gas system .............................................................................................................10911.2 Exhaust gas outlet ............................................................................................................................11111.3 External exhaust gas system ...........................................................................................................

11512. Turbocharger Cleaning .............................................................................................................................11512.1 Manually operated cleaning system .................................................................................................11512.2 Automatic cleaning system ...............................................................................................................

11813. Exhaust Emissions ...................................................................................................................................11813.1 Dual fuel engine exhaust components .............................................................................................11813.2 Marine exhaust emissions legislation ...............................................................................................12113.3 Methods to reduce exhaust emissions .............................................................................................

12214. Automation System ..................................................................................................................................12214.1 System components and their function ............................................................................................12614.2 Interface and control .........................................................................................................................12914.3 Power supply ....................................................................................................................................13114.4 Alarm and safety ..............................................................................................................................13214.5 Engine modes ..................................................................................................................................

13715. Foundation .................................................................................................................................................

13715.1 Steel structure design ......................................................................................................................13715.2 Engine mounting ..............................................................................................................................14815.3 Flexible pipe connections .................................................................................................................

14916. Vibration and Noise ..................................................................................................................................14916.1 External forces and couples .............................................................................................................15016.2 Torque variations ..............................................................................................................................15016.3 Structure borne noise .......................................................................................................................15116.4 Air borne noise .................................................................................................................................15216.5 Exhaust noise ...................................................................................................................................

15317. Power Transmission .................................................................................................................................15317.1 Flexible coupling ...............................................................................................................................15317.2 Input data for torsional vibration calculations ...................................................................................15417.3 Turning gear .....................................................................................................................................

15518. Engine Room Layout ................................................................................................................................15518.1 Crankshaft distances ........................................................................................................................15618.2 Space requirements for maintenance ..............................................................................................15818.3 Transportation and storage of spare parts and tools ........................................................................15818.4 Required deck area for service work ................................................................................................

16319. Transport Dimensions and Weights ........................................................................................................16319.1 Lifting of engines ..............................................................................................................................16719.2 Engine components ..........................................................................................................................

17120. Product Guide Attachments .....................................................................................................................

17221. ANNEX ........................................................................................................................................................

Product Guide Wärtsilä 50DF - 2/2010 v



6/182

17221.1 Unit conversion tables ......................................................................................................................17321.2 Collection of drawing symbols used in drawings ..............................................................................

vi Product Guide Wärtsilä 50DF - 2/2010



7/182

1. Main Data and OutputsThe Wärtsilä 50DF is a 4-stroke, non-reversible, turbocharged and inter-cooled dual fuel engine with directinjection of liquid fuel and indirect injection of gas fuel. The engine can be operated in gas mode or indiesel mode.

500 mmCylinder bore ..............................580 mmStroke ..........................................

113.9 l/cylPiston displacement ...................

2 inlet valves and 2 exhaust valvesNumber of valves ........................

6, 8 and 9 in-line; 12, 16 and 18 in V-formCylinder configuration .................

45°V-angle ........................................

clockwiseDirection of rotation ....................

500, 514 rpmSpeed ..........................................

9.7, 9.9 m/sMean piston speed .....................

1.1 Maximum continuous outputTable 1.1 Rating table for Wärtsilä 50DF

IMO Tier 2Cylinderconfiguration

514 rpm500 rpm

BHPkWBHPkW

7950585077505700W 6L50DF

106007800103407600W 8L50DF

119308775116308550W 9L50DF

15910117001550011400W 12V50DF

21210156002067015200W 16V50DF

23860175502326017100W 18V50DF

Nominal speed 514 rpm is recommended for mechanical propulsion engines.

The mean effective pressure Pe can be calculated using the following formula:

where:

mean effective pressure [bar]Pe =

output per cylinder [kW]P =

engine speed [r/min]n =

cylinder diameter [mm]D =

length of piston stroke [mm]L =

operating cycle (4)c =

Product Guide Wärtsilä 50DF - 2/2010 1

Product Guide1. Main Data and Outputs


8/182

1.2 Derating of output in gas mode

1.2.1 Derating due to methane number

Figure 1.1 Derating factor due to methane number

Notes:

The dew point shall be calculated for the specific siteconditions. The minimum charge air temperature shall beabove the dew point, otherwise condensation will occurin the charge air cooler.

Compensating a low methane number gas by loweringthe receiver temperature below 45°C is not allowed.

Compensating a higher charge air temperature than 45°Cby a high methane number gas is not allowed.

The charge air temperature is approximately 5°C higherthan the charge air coolant temperature at rated load.

The engine can be optimized for a lower methane numberbut that will affect the performance.

2 Product Guide Wärtsilä 50DF - 2/2010



9/182

1.2.2 Derating due to gas feed pressure and lower heating value

Figure 1.2 Derating due to gas feed pressure / LHV

Notes:

No compensation (uprating) of the engine output is al-lowed, neither for gas feed pressure higher than requiredin the graph above nor lower heating value above 36MJ/m3N .

The above given values for gas feed pressure (absolutepressure) are at engine inlet (before the gas filter, whichare mounted on the engine). The pressure drop over thegas valve unit (GVU) is approx. 50 kPa.

Values given in m3N are at 0°C and 101.3 kPa.




10/182

1.3 Reference conditions

The output is available within a range of ambient conditions and coolant temperatures specified in thechapter Technical Data. The required fuel quality for maximum output is specified in the section Fuel characteristics. For ambient conditions or fuel qualities outside the specification, the output may have to bereduced.

The specific fuel consumption is stated in the chapter Technical Data. The statement applies to engines

operating in ambient conditions according to ISO 3046-1:2002 (E).

100 kPatotal barometric pressure

25°Cair temperature

30%relative humidity

25°Ccharge air coolant temperature

Correction factors for the fuel oil consumption in other ambient conditions are given in standard ISO 3046-1:2002.

1.4 Operation in inclined position

Max. inclination angles at which the engine will operate satisfactorily.

15°Transverse inclination, permanent (list) ..................

22.5°Transverse inclination, momentary (roll) .................

10°Longitudinal inclination, permanent (trim) ...............




11/182

1.5 Dimensions and weights

Figure 1.3 In-line engines (DAAE000316d)

HE2HE1LE5*LE5LE4LE3*LE3LE2LE1*LE1TCEngine4000358016055546012951295617083108205NA357W 6L50DF

4000347523055546012951295617083108120TPL71

40003920-700460-17757810-10270TPL76W 8L50DF

40003920-700460-17758630-11140TPL76W 9L50DF

WeightWE6WE5WE3WE2WE1HE6HE5HE4HE3TCEngine

96395189514451940327092526556501455NA357W 6L50DF

96420189514451940327079026856501455TPL71

1283402100144519403505110028206501455TPL76W 8L50DF

1483402100144519403505110028206501455TPL76W 9L50DF

* TC in driving end

All dimensions in mm. Weights are dry engines, in metric tons, of rigidly mounted engines without flywheel.




12/182

Figure 1.4 V-engines (DAAE000413c)

HE4HE3HE2HE1LE5*LE5LE4LE3*LE3LE2LE1*LE1TCEngine8001500360040555005004601840184078501054010410NA357W 12V50DF

8001500360042404354354601840184078501054010425TPL71

80015003600440068068046023002300100501320013830TPL76W 16V50DF

800150036004400-680460-230011150-14180TPL76W 18V50DF

WeightWE6WE5WE4**WE4WE3WE2WE1ΔWE1HE6HE5TCEngine

17576522201300149518002290452038109253080NA357W 12V50DF

175770222013001495180022904525405511403100TPL71

224930222013001495180022905325473011003300TPL76W 16V50DF

244930222013001495180022905325473011003300TPL76W 18V50DF

* TC in driving end

** With monospex (exhaust manifold)

Δ With air suction branches

All dimensions in mm. Weights are dry engines, in metric tons, of rigidly mounted engines without flywheel.




13/182

Figure 1.5 Example of total installation lengths, in-line engines (DAAE000489)

Figure 1.6 Example of total installation lengths, V-engines (DAAE000489)

Genset weight [ton]DCBAEngine13810902235494012940W 6L50DF

17110202825506015060W 8L50DF

18510202825506015910W 9L50DF

23913652593525315475W 12V50DF

28815902050469017540W 16V50DF

31515902050469018500W 18V50DF

Values are indicative only and are based on Wärtsilä 50DF engine with built-on pumps and turbocharger at

free end of the engine.

Generator make and type will effect width, length, height and weight .

[All dimensions are in mm]




14/182

2. Operating ranges

2.1 Engine operating range

Below nominal speed the load must be limited according to the diagrams in this chapter in order to maintain

engine operating parameters within acceptable limits. Operation in the shaded area is permitted only tem-porarily during transients. Minimum speed and speed range for clutch engagement are indicated in thediagrams, but project specific limitations may apply.

2.1.1 Controllable pitch propellers

An automatic load control system is required to protect the engine from overload. The load control reducesthe propeller pitch automatically, when a pre-programmed load versus speed curve (“engine limit curve”)is exceeded, overriding the combinator curve if necessary. Engine load is determined from measured shaftpower and actual engine speed. The shaft power meter is Wärtsilä supply.

The propulsion control must also include automatic limitation of the load increase rate. Maximum loadingrates can be found later in this chapter.

The propeller efficiency is highest at design pitch. It is common practice to dimension the propeller so thatthe specified ship speed is attained with design pitch, nominal engine speedand 85% output in the specifiedloading condition. The power demand from a possible shaft generator or PTO must be taken into account.The 15% margin is a provision for weather conditions and fouling of hull and propeller. An additional enginemargin can be applied for most economical operation of the engine, or to have reserve power.

Figure 2.1 Operating field for CP-propeller, 975 kW/cyl, rated speed 514 rpm

Remarks: The maximum output may have to be reduced depending on gas properties and gas pressure,refer to section "Derating of output in gas mode". The permissible output will in such case be reduced with

same percentage at all revolution speeds.Restrictions for low load operation to be observed.


Product Guide2. Operating ranges


15/182

2.2 Electric power generation

When specifying machinery for electric power generation in marine applications, an engine margin of about10% should be applied, i.e. the power demand should not during normal operation exceed 90% of themaximum continuous rating (MCR). Expected variations in gas fuel quality should be taken into account,when determining the margin. The maximum output of dual fuel engines for electric power generation is100% of the MCR in gas mode and 110% of the MCR on diesel mode. Overload is permitted only in

emergency situations.

2.3 Loading capacity

Controlled load increase is essential for highly supercharged engines, because the turbocharger needstime to accelerate before it can deliver the required amount of air. Sufficient time to achieve even temper-ature distribution in engine components must also be ensured. Dual fuel engines operating in gas moderequire precise control of the air/fuel ratio, which makes controlled load increase absolutely decisive forproper operation on gas fuel.

If the control system has only one load increase ramp, or no knee point at 85% load, then the ramp for apreheated engine must be used. The HT-water temperature in a preheated engine must be at least 60ºC,preferably 70ºC, and the lubricating oil temperature must be at least 40ºC.

Emergency loading may only be possible by activating an emergency function, which generates visual andaudible alarms in the control room and on the bridge.

The load should always be applied gradually in normal operation. Acceptable load increments are smallerin gas mode than in diesel mode and also smaller at high load, which must be taken into account in applic-ations with sudden load changes. In the case of electric power generation, the classification society shallbe contacted at an early stage in the project regarding system specifications and engine loading capacity.

Electric generators must be capable of 10% overload. The maximum engine output is 110% in diesel modeand 100% in gas mode. Transfer to diesel mode takes place automatically in case of overload. Expectedvariations in gas fuel quality and load level should be taken into account to ensure that gas operation canbe maintained at normal load.

2.3.1 Mechanical propulsion, controllable pitch propeller (CPP)

Figure 2.2 Maximum load increase rates for variable speed engines

The propulsion control must not permit faster load reduction than 20 s from 100% to 0% without automatictransfer to diesel first.




16/182

2.3.2 Electric propulsion

Figure 2.3 Maximum load increase rates for engines operating at nominal speed

The propulsion control and the power management system must not permit faster load reduction than 20s from 100% to 0% without automatic transfer to diesel first.

Maximum instant load steps

The electrical system must be designed so that tripping of breakers can be safely handled. This requiresthat the engines are protected from load steps exceeding their maximum load acceptance capability. Iffast load shedding is complicated to implement or undesired, the instant load step capacitycan be increasedwith a fast acting signal that requests transfer to diesel mode.

Gas mode

Figure 2.4 Maximum instant load steps in % of MCR in gas mode

• Maximum step-wise load increases according to figure

•

Steady-state frequency band ≤ 1.5 %• Maximum speed drop 10 %

• Recovery time ≤ 10 s




17/182

• Time between load steps ≥ 30 s

• Maximum step-wise load reductions: 100-75-45-0%

Diesel mode

• Maximum step-wise load increase 33% of MCR

•

Steady-state frequency band ≤ 1.0 %• Maximum speed drop 10 %

• Recovery time ≤ 5 s

• Time between load steps ≥ 10 s

Start-up time

In diesel mode the generator reaches nominal speed in about 25 seconds after the start signal. Starting ingas mode takes about one minute.

2.4 Low air temperature

In cold conditions the following minimum inlet air temperatures apply:

• Starting + 5ºC

• Idling - 5ºC

• High load - 10ºC

The two-stage charge air cooler is useful for heating of the charge air during prolonged low load operationin cold conditions. Sustained operation between 0 and 40% load can however require special provisionsin cold conditions to prevent too low HT-water temperature. If necessary, the preheating arrangement canbe designed to heat the running engine (capacity to be checked).

For further guidelines, see chapter Combustion air system design.

2.5 Operation at low load and idling

2.5.1 Gas mode operation

Operation in gas mode below 10% load is restricted to 5 minutes due to the risk of incomplete combustion.The engine automatically transfers into diesel mode (MDF) if the load remains below 10% of the ratedoutputfor more than 5 minutes. Operation in gas mode at above 10% load is not restricted.

2.5.2 Diesel mode operation

The engine can be started, stopped and operated on heavy fuel under all operating conditions. Continuousoperation on heavy fuel is preferred rather than changing over to diesel fuel at low load operation andmanoeuvring.

Absolute idling (disconnected generator)

• Maximum 10 minutes if the engine is to be stopped after the idling. 3-5 minutes idling before stop isrecommended.

• Maximum 6 hours if the engine is to be loaded after the idling.

Operation below 20 % load

• Maximum 100 hours continuous operation. At intervals of 100 operating hours the engine must beloaded to minimum 70 % of the rated output.

Operation above 20 % load

• No restrictions.




18/182

3. Technical Data

3.1 Introduction

This chapter contains technical data of the engine (heatbalance, flows, pressures etc.) for design of ancillary

systems. Further design criteria for external equipment and system layouts are presented in the respectivechapter.

Separate data is given for engines driving propellers “ME” and engines driving generators “DE”.

3.1.1 Engine driven pumps

The basic fuel consumption given in the technical data tables are with engine driven lubricating oil andcooling water pumps. The decrease in fuel consumption, without engine driven pumps, in g/kWh is givenin the table below:

Engine load [%]Decrease in fuel consumption

5075100

432g/kWhLubricating oil pump

21.61g/kWhHT- and LT-water pump

For calculation of gas consumption adjusted without engine driven pumps; use values in the table belowcalculated using above table and with Methane (CH4) as reference fuel gas, with lower calorific value of 50MJ/kg.

Engine load [%]Decrease in gas consumption

5075100

200150100kJ/kWhLubricating oil pump

1008050kJ/kWhHT- and LT-water pump


Product Guide3. Technical Data


19/182

3.2 Wärtsilä 6L50DF

ME

IMO Tier 2

DE

IMO Tier 2

DE

IMO Tier 2Wärtsilä 6L50DF

DieselmodeGas modeDieselmodeGas modeDieselmodeGas mode

975975950kWCylinder output

514514500rpmEngine speed

585058505700kWEngine output

2.02.02.0MPaMean effective pressure

Combustion air system (Note 1)

11.09.211.39.211.39.2kg/sFlow at 100% load

454545°CTemperature at turbocharger intake, max.

504550455045°CTemperature after air cooler, nom. (TE 601)

Exhaust gas system

11.39.411.69.411.69.4kg/sFlow at 100% load

8.47.29.07.19.07.1kg/sFlow at 75% load

6.15.36.35.46.35.4kg/sFlow at 50% load

350369343373343373°CTemperature after turbocharger at 100% load (TE 517)



444kPa (bar)Backpressure, max.

849786856789856789mmCalculated exhaust diameter for 35 m/s

Heat balance at 100% load (Note 2)

108064010406601040660kWJacket water, HT-circuit

124086012608401260840kWCharge air, HT-circuit

610500630500630500kWCharge air, LT-circuit

820470780470780470kWLubricating oil, LT-circuit

230210180160180160kWRadiation

Fuel consumption (Note 3)

-7300-7300-7300kJ/kWhTotal energy consumption at 100% load



-7258-7258-7258kJ/kWhFuel gas consumption at 100% load



1901.01891.01891.0g/kWhFuel oil consumption at 100% load


2002.32042.42042.4g/kWhFuel oil consumption 50% load

Fuel gas system (Note 4)

-475-475-475kPaGas pressure at engine inlet, min (PT901)

-525-525-525kPaGas pressure to Gas Valve unit, min

-0...60-0...60-0...60°CGas temperature before Gas Valve Unit

Fuel oil system

800±50800±50800±50kPaPressure before injection pumps (PT 101)

6.36.26.1m3 /hFuel oil flow to engine, approx

16...24-16...24-16...24-cStHFO viscosity before the engine

2.82.82.8cStMDF viscosity, min.140-140-140-°CMax. HFO temperature before engine (TE 101)

4.7-4.6-4.6-kg/hLeak fuel quantity (HFO), clean fuel at 100% load

23.311.723.211.623.211.6kg/hLeak fuel quantity (MDF), clean fuel at 100% load

2...112...112...11cStPilot fuel (MDF) viscosity before the engine

400...800400...800400...800kPaPilot fuel pressure at engine inlet (PT 112)

100±20100±20100±20kPaPilot fuel outlet pressure, max

276276276kg/hPilot fuel return flow at 100% load

Lubricating oil system (Note 5)

400400400kPaPressure before bearings, nom. (PT 201)

800800800kPaPressure after pump, max.

404040kPaSuction ability, including pipe loss, max.

808080kPaPriming pressure, nom. (PT 201)

636363°CTemperature before bearings, nom. (TE 201)

787878°CTemperature after engine, approx.153153149m3 /hPump capacity (main), engine driven

140140140m3 /hPump capacity (main), electrically driven

34.0 / 34.034.0 / 34.034.0 / 34.0m3 /hPriming pump capacity (50/60Hz)




20/182

ME

IMO Tier 2

DE

IMO Tier 2

DE





888m3Oil volume in separate system oil tank

0.50.50.5g/kWhOil consumption at 100% load, approx.

130013001300l/minCrankcase ventilation flow rate at full load

500500500PaCrankcase ventilation backpressure, max.

8.5...9.58.5...9.58.5...9.5lOil volume in turning device

1.41.41.4lOil volume in speed governor

HT cooling water system

250 + static250 + static250 + statickPaPressure at engine, after pump, nom. (PT 401)

480480480kPaPressure at engine, after pump, max. (PT 401)

747474°CTemperature before cylinders, approx. (TE 401)

919191°CTemperature after charge air cooler, nom.

135135135m3 /hCapacity of engine driven pump, nom.

505050kPaPressure drop over engine, total

150150150kPaPressure drop in external system, max.

70...15070...15070...150kPaPressure from expansion tank

0.950.950.95m3Water volume in engine

LT cooling water system250+ static250+ static250+ statickPaPressure at engine, after pump, nom. (PT 471)


383838°CTemperature before engine, max. (TE 471)

252525°CTemperature before engine, min. (TE 471)


303030kPaPressure drop over charge air cooler



Starting air system

300030003000kPaPressure, nom. (PT 301)

100010001000kPaPressure at engine during start, min. (20 °C)

300030003000kPaPressure, max. (PT 301)

180018001800kPaLow pressure limit in starting air vessel

3.63.63.6Nm3Consumption per start at 20 °C (successful start)4.34.34.3Nm3Consumption per start at 20 °C (with slowturn)

Notes:

At Gas LHV 49620kJ/kgNote 1

At 100% output and nominal speed. The figures are valid for ambient conditions according to ISO 3046/1, except for LT-water temperature, which is 35ºC in gasoperation and 45ºC in back-up fuel operation. And with engine driven water, lube oil and pilot fuel pumps.

Note 2

According to ISO 3046/1, lower calorific value 42700kJ/kg, with engine driven pumps. Tolerance 5%. Gas Lower heating value >28 MJ/m3N and MethaneNumberHigh (>80). The fuel consumption BSEC and SFOC are guaranteed from 100% to 75% load and the values at other loads are given for indication only.

Note 3

Fuel gas pressure given at LHV ≥ 36MJ/m³N. Required fuel gas pressure depends on fuel gas LHV and need to be increased for lower LHV's. Pressure drop inexternal fuel gas system to be considered. See chapter Fuel system for further information.

Note 4

Lubricating oil treatment losses and oil changes are not included in oil consumption. The lubricating oil volume of the governor is depending of the governor type.Note 5

ME = Engine driving propeller, variable speed

DE = Diesel-Electric engine driving generator

Subject to revision without notice.




21/182


ME

IMO Tier 2

DE

IMO Tier 2

DE








14.612.215.012.215.012.2kg/sFlow at 100% load



Exhaust gas system

15.012.515.412.515.412.5kg/sFlow at 100% load

11.29.611.99.511.99.5kg/sFlow at 75% load

8.17.18.47.28.47.2kg/sFlow at 50% load











307280240213240213kWRadiation















Fuel oil system























22/182

ME

IMO Tier 2

DE

IMO Tier 2

DE









8.5...9.58.5...9.58.5...9.5lOil volume in turning device




















Starting air system






Notes:



Note 2


Note 3


Note 4








23/182


ME

IMO Tier 2

DE

IMO Tier 2

DE








16.413.716.913.716.913.7kg/sFlow at 100% load



Exhaust gas system

16.914.117.414.117.414.1kg/sFlow at 100% load

12.610.813.410.613.410.6kg/sFlow at 75% load

9.18.09.58.19.58.1kg/sFlow at 50% load











345315270240270240kWRadiation















Fuel oil system























24/182

ME

IMO Tier 2

DE

IMO Tier 2

DE









68...7068...7068...70lOil volume in turning device




















Starting air system






Notes:



Note 2


Note 3


Note 4








25/182

3.5 Wärtsilä 12V50DF

ME

IMO Tier 2

DE

IMO Tier 2

DE

IMO Tier 2Wärtsilä 12V50DF







21.918.322.518.322.518.3kg/sFlow at 100% load



Exhaust gas system

22.518.823.118.823.118.8kg/sFlow at 100% load

16.814.417.914.217.914.2kg/sFlow at 75% load

12.210.612.710.812.710.8kg/sFlow at 50% load











460420360320360320kWRadiation















Fuel oil system























26/182

ME

IMO Tier 2

DE

IMO Tier 2

DE





























Starting air system






Notes:



Note 2


Note 3


Note 4








27/182


ME

IMO Tier 2

DE

IMO Tier 2

DE








29.124.430.024.430.124.5kg/sFlow at 100% load



Exhaust gas system

30.025.130.925.130.925.1kg/sFlow at 100% load

22.319.223.918.923.918.9kg/sFlow at 75% load

16.214.116.914.416.914.4kg/sFlow at 50% load











613560480427480427kWRadiation















Fuel oil system























28/182

ME

IMO Tier 2

DE

IMO Tier 2

DE





























Starting air system






Notes:



Note 2


Note 3


Note 4








29/182


ME

IMO Tier 2

DE

IMO Tier 2

DE








32.827.533.727.533.827.5kg/sFlow at 100% load



Exhaust gas system

33.828.234.728.234.728.2kg/sFlow at 100% load

25.121.626.921.326.921.3kg/sFlow at 75% load

18.315.919.016.219.016.2kg/sFlow at 50% load











690630540480540480kWRadiation















Fuel oil system























30/182

ME

IMO Tier 2

DE

IMO Tier 2

DE





























Starting air system






Notes:



Note 2


Note 3


Note 4








31/182

4. Description of the Engine

4.1 Definitions

Figure 4.1 In-line engine and V-engine definitions (1V93C0029 / 1V93C0028)

4.2 Main components and systems

Main dimensions and weights are presented in chapter Main Data and Outputs .

4.2.1 Engine Block

The engine block, made of nodular cast iron, is cast in one piece for all cylinder numbers. It has a stiff anddurable design to absorb internal forces and enable the engine to be resiliently mounted without any inter-mediate foundations.

The engine has an underslung crankshaft held in place by main bearing caps. The main bearing caps, madeof nodular cast iron, are fixed from below by two hydraulically tensioned screws. They are guided sidewaysby the engine block at the top as well as at the bottom. Hydraulically tightened horizontal side screws atthe lower guiding provide a very rigid crankshaft bearing.

A hydraulic jack, supported in the oil sump, offers the possibility to lower and lift the main bearing caps,e.g. when inspecting the bearings. Lubricating oil is led to the bearings and piston through this jack. A combined flywheel/thrust bearing is located at the driving end of the engine. The oil sump, a light weldeddesign, is mounted on the engine block from below and sealed by O-rings.

The oil sump is of dry sump type and includes the main distributing pipe for lubricating oil. The dry sumpis drained at both ends to a separate system oil tank. For applications with restricted height a low sumpcan be specified for in-line engines, however without the hydraulic jacks.

4.2.2 Crankshaft

The crankshaft design is based on a reliability philosophy with very low bearing loads. High axial and tor-sional rigidity is achieved by a moderate bore to stroke ratio. The crankshaft satisfies the requirements ofall classification societies.

The crankshaft is forged in one piece and mounted on the engine block in an under-slung way. In V-enginesthe connecting rods are arranged side-by-side on the same crank pin in order to obtain a high degree ofstandardization. The journals are of same size regardless of number of cylinders.

The crankshaft is fullybalanced to counteract bearing loads from eccentric masses by fitting counterweightsin every crank web. This results in an even and thick oil film for all bearings. If necessary, the crankshaft isprovided with a torsional vibration damper.


Product Guide4. Description of the Engine


32/182

The gear wheel for the camshaft drive is bolted on the flywheel end. Both the gear wheel for the pump driveand the torsional vibration damper are bolted on the free end if installed.

4.2.3 Connection rod

The connecting rod is made of forged alloy steel. It comprises a three-piece design, which gives a minimumdismantling height and enables the piston to be dismounted without opening the big end bearing. All con-

necting rod studs are hydraulically tightened. Oil is led to the gudgeon pin bearing and piston through abore in the connecting rod. The gudgeon pin bearing is of tri-metal type.

4.2.4 Main bearings and big end bearings

The main bearing consists of two replaceable precision type bearing shells, the upper and the lower shell.Both shells are peripherally slightly longer than the housing thus providing the shell fixation. The mainbearing located closest to the flywheel is an extra support to both the flywheel and the coupling. Four thrustbearing segments provide the axial guidance of the crankshaft.

The main bearings and the big end bearings are of tri-metal design with steel back, lead-bronze lining anda soft and thick running layer.

4.2.5 Cylinder liner

The cylinder liner is centrifugally cast of a special grey cast iron alloy developed for good wear resistanceand high strength. It is designed with a high and rigid collar, making it resistant against deformations. A distortion free liner bore in combination with excellent lubrication improves the running conditions for thepiston and piston rings, and reduces wear.

The liner is of wet type, sealed against the engine block metallically at the upper part and by O-rings at thelower part. Accurate temperature control of the cylinder liner is achieved with optimally located longitudinalcooling bores. To eliminate the risk of bore polishing the liner is equipped with an anti-polishing ring.

4.2.6 Piston

The piston is of composite design with nodular cast iron skirt and steel crown. The piston skirt is pressure

lubricated, which ensures a well-controlled oil flow to the cylinder liner during all operating conditions. Oilis fed through the connecting rod to the cooling spaces of the piston. The pistoncooling operates accordingto the cocktail shaker principle. The piston ring grooves in the piston top are hardened for better wear res-istance.

4.2.7 Piston rings

The piston ring set consists of two directional compression rings and one spring-loaded conformable oilscraper ring. All rings are chromium-plated and located in the piston crown.

4.2.8 Cylinder head

The cylinder head is made of grey cast iron, the main design criteria being high reliability and easy mainten-ance. The mechanical load is absorbed by a strong intermediate deck, which together with the upper deckand the side walls form a box section in the four corners of which the hydraulically tightened cylinder headbolts are situated.

The cylinder head features two inlet and two exhaust valves per cylinder. All valves are equipped with valverotators. No valve cages are used, which results in very good flow dynamics. The basic criterion for theexhaust valve design is correct temperature by carefully controlled water cooling of the exhaust valve seat.The thermally loaded flame plate is cooled efficiently by cooling water led from the periphery radially towardsthe centre of the head. The bridges between the valves cooling channels are drilled to provide the bestpossible heat transfer.

4.2.9 Camshaft and valve mechanism

There is one campiece for each cylinder with separate bearing pieces in between. The cam and bearing

pieces are held together with flange connections. This solution allows removing of the camshaft piecessideways. The drop forged completely hardened camshaft pieces have fixed cams. The camshaft bearinghousings are integrated in the engine block casting and are thus completely closed. The bearings are installed




33/182

and removed by means of a hydraulic tool. The camshaft covers, one for each cylinder, seal against theengine block with a closed O-ring profile. The valve mechanism guide block is integrated into the cylinderblock. The valve tappets are of piston type with self-adjustment of roller against cam to give an even distri-bution of the contact pressure. Double valve springs make the valve mechanism dynamically stable.

4.2.10 Camshaft drive

The camshafts are driven by the crankshaft through a gear train.The driving gear is fixed to the crankshaft by means of flange connection.

4.2.11 Fuel system

The Wärtsilä 50DF engine is designed for continuous operation on fuel gas (natural gas) or Marine DieselFuel (MDF). It is also possible to operate the engine on Heavy Fuel Oil (HFO). Dual fuel operation requiresexternal gas feed system and fuel oil feed system. For more details about the fuel system see chapter Fuel System .

Fuel gas system

The fuel gas system on the engine comprises the following built-on equipment:

• Low-pressure fuel gas common rail pipe

• Gas admission valve for each cylinder

• Safety filters at each gas admission valve

• Common rail pipe venting valve

• Double wall gas piping

The gas common rail pipe delivers fuel gas to each admission valve. The common rail pipe is a fully weldedsingle wall pipe, with a large diameter, also acting as a pressure accumulator. Feed pipes distribute thefuel gas from the common rail pipe to the gas admission valves located at each cylinder.

The gas admissionvalves (one percylinder) are electronically controlled and actuated to feed each individualcylinder with the correct amount of gas. The gas admission valves are controlled by the engine controlsystem to regulate engine speed and power. The valves are located on the cylinder head (for V-engines)or on the intake duct of the cylinder head (for in-line engines). The gas admission valve is a direct actuatedsolenoid valve. The valve is closed by a spring (positive sealing) when there is no electrical signal. With theengine control system it is possible to adjust the amount of gas fed to each individual cylinder for loadbalancing of the engine, while the engine is running. The gas admission valves also include safety filters(90 µm).

The venting valve of the gas common rail pipe is used to release the gas from the common rail pipe whenthe engine is transferred from gas operating mode to diesel operating mode. The valve is pneumaticallyactuated and controlled by the engine control system.

The fuel gas fine filter is a full flow unit preventing impurities from entering the fuel gas system. The finenessof the filter is 5 µm absolute mesh size (0.5 µm at 98.5% separation). The filter is located in the externalsystem if double wall gas piping is used.

Main fuel oil injection

The main fuel oil injection system is in use when the engine is operating in diesel mode. When the engineis operating in gas mode, fuel flows through the main fuel oil injection system at all times enabling an instanttransfer to diesel mode.

The engine internal main fuel oil injectionsystem comprises the followingmain equipment foreach cylinder:

• Fuel injection pump

• High pressure pipe

• Twin fuel injection valve (for main and pilot injection)

The fuel injection pump design is of the mono-element type designed for injection pressures up to 150MPa. The injectionpumps have built-in roller tappets, and are also equipped with pneumatic stop cylinders,which are connected to overspeed protection system.




34/182

The high-pressure injection pipe runs between the injection pump and the injection valve. The pipe is ofdouble wall shielded type and well protected inside the engine hot box.

The twin injection valve is a combined main fuel oil injection and pilot fuel oil injection valve, which is centrallylocated in the cylinder head. The main diesel injection part of the valve uses traditional spring loaded needledesign.

The hotbox encloses all main fuel injection equipment and system piping, providing maximum reliability

and safety. The high pressureside of the main injection system is thus completely separated from the exhaustgas side and the engine lubricating oil spaces. Any leakage in the hot box is collected to prevent fuel frommixing with lubricating oil. For the same reason the injection pumps are also completely sealed off fromthe camshaft compartment.

Pilot fuel injection

The pilot fuel injection system is used to ignite the air-gas mixture in the cylinder when operating the enginein gas mode. The pilot fuel injection system uses the same external fuel feed system as the main fuel oilinjection system.

The pilot fuel system comprises the following built-on equipment:

• Pilot fuel oil filter

• Common rail high pressure pump• Common rail piping

• Twin fuel oil injection valve for each cylinder

The pilot fuel filter is a full flow duplex unit preventing impurities entering the pilot fuel system. The finenessof the filter is 10 µm.

The high pressure pilot fuel pump is of engine-driven type in case of diesel-electric engines driving gener-ators a

Documents

Wartsila 50DF PG