wartsila 26

26

Technology Review

Setting new standards for economical power productions 4

Design Philosophy 6

Low NOx combustion 8

Piston and piston rings 10

Connecting rod / Camshaft 11

Main bearing / Crankshaft 12

Engine block and foundation 13

Cylinder liner with anti-polishing ring / Cylinder head 14

Fuel System / The fuel injection system 15

Engine-driven pumps / Air intake and exhaust system 16

Engine control system 17

Maintenance 18

Service solutions to optimize profitability 19

Daily round-the-clock service, wherever it is needed 20

Main data marine 21

Main data power 22

Technology Review Contents

3Technology Review Wärtsilä 26

26

Setting new standards for economical power productions

5Technology Review Wärtsilä 264Technology Review Wärtsilä 26

Wärtsilä 26 offers an outstanding total economy concept

adding up to numerous valuable benefits for the customer.

The Queen of the Netherlands, dredger,

equipped with two Wärtsilä 12V46 engines and a Wärtsilä 6L26 genset.

Morgenstond II, dry cargo vessel,

equipped with a Wärtsilä 9L26 engine.

Articaborg, electric icebreaking supply vessel,

equipped with two 1950 kW Wärtsilä 6L26 engines.

KW 34, fishing vessel,

equipped with a Wärtsilä 9L26 engine.

Power Plant Köyliön Sähkö,

equipped with a Wärtsilä 18V26 engine, Finland.

26

Wärtsilä engine designs are based on generation of know-how combined with innovations

in response to customer needs. It is also fully optimised for today’s flexible manufacturing

methods.

The Wärtsilä 26 engine offers the customer the following core values:

■ easy space-saving installation

■ easy to install

■ high availability

■ environmental friendliness

■ low operational costs

Extensive testing in our modern diesel laboratories backed up by several thousand running

hours and have made the innovated Wärtsilä 26 a reliable diesel engine.

Design Philosophy


Wärtsilä 26 generator set

The Wärtsilä 26 was developed in response to a need in the market for a new engine in

the 260 mm cylinder bore class. The Wärtsilä 26 represents the latest technological

innovation, combining fuel economy and low emission rates with high fuel versatility.

The shortest and lowest engine in its class, the Wärtsilä 26 requires minimum space in

the engine room.

Wärtsilä works in close co-operation with the customer in conducting field tests and

follow-ups of selected test components. This has resulted in satisfied customers:

the engine has already proven its force by making 67,000 running hours.

210 Engines since the new design in 1997.

With fewer parts, lower maintenance requirements, low fuel consumption, less emissions,

and the ability to run reliably on a variety of fuels, the Wärtsilä 26 is unquestionably the

state-of-the-art in marine propulsion and in power generation.

26

World Bank Guide Lines Compliance

When talking about Power Plant stack emissions, nitrogen oxides (NOx), sulphur dioxides

(SOx) and particles (as dry dust) are in focus. World Bank Guidelines 1998 for “Thermal

Power: Guidelines for New Plants” take into account the air quality in the surrounding of the

power plant when defining the applicable stack limits.

The 26-engine is designed for minimum

NOx emissions at an optimum fuel con-

sumption. The engine fulfills the new (from

1.7.2000) World Bank NOx stack limit for

‘non-degraded areas’. In a ‘degraded area’,

which might be the case for a big city with

heavy car traffic etc., the stack limit for

NOx is lower and a SCR catalyst has to be

applied. Emissions of sulphur dioxides and

particles are fuel related (mainly dependent

on sulphur and ash content of the fuel).

IMO NOx Compliance

Any hydrocarbon fuel can be burned provided the fuel temperature is right and there is

sufficient oxygen. However, the way it is burned has a great effect on thermal efficiency and

exhaust emissions, particularly NOx formation.Wärtsilä has developed the Wärtsilä 26 to

perform in an optimum way in load acceptance and efficiency, while keeping the emissions

amply below the limits set by IMO (International Maritime Organization). The engine is

delivered with an EIAPP (Engine International Air Pollution Prevention) Statement of

Compliance. With the engine a Technical File is delivered mentioning the parts influencing

NOx formation. With this the parts in the engine can be identified as the correct ones.

The combustion is optimized by means of:

■ a higher combustion air temperature at the start of injection, which drastically

reduces the ignition delay

■ a retarded start to injection and shorter injection duration, making that

combustion takes place at the optimal point with respect to efficiency and

reduction of NOx


IMO NOx limit for new engines

1700 1750 1800 1850 1900 1950 2000

350

330

310

290

270

ppvm

Greenhouse Effect and Global Warming

20

18

16

14

12

10

8

6

0 200 400 600 800 1000 1200 1400 1600 1800 2000

IMO/MPEC/BCH proposal: NOx limit as a function of engine speed

Wärtsilä 26 low NOx combustion

Specific NOx emissions

weighted (g/kWh)

Rated engine speed (rpm)

Atmospheric concentrations

of carbon dioxide since 1750

Ice core measurement(siple station, West Antarctia)

Direct measurement (Mauna Loa, Hawaii)

CFC 24%

Carbon dioxide concentrationsGreenhouse Gases

N2O 6%

CO2 55%

Methane 15%

Sou

rce:

Env

ironm

enta

l Dat

a R

epor

t, U

NE

P 1

990

Low NOx combustion

1999 2000 2001

200

400

600

800

1000

1200World Bank (non-degraded airshed):2300 mg/nm3 (dry, 15 vol-% O2, 0 ˚C)

World Bank (non-degraded airshed):2000 mg/nm3 (dry, 15 vol-% O2, 0 ˚C)

Appying for FundingAfter 1.7.2000

NOx Emmission limits/World Bank 1998 Guide Lines

World Bank (degraded airshed): 400 mg/nm3 (dry, 15 vol-% O2, 0 ˚C)

pp

m-v

(dry

, at

15 v

ol-%

O2)

26

■ The connecting rod has a horizontally-split bottom end to

obtain minimal length and high rigidity.

■ It has only one single drilled hole, without plugs, for the flow

of lubricating oil to the piston, securing oil supply

under all circumstances, without risk of leakage.

Camshaft

■ The camshaft is composed of individual single-cylinder units, with bolted flange

connections to separate journals.

■ The flanges are formed by cams, allowing maximum rigidity for the fuel cam loads.

■ Valve tappets are built into modules bolted on the engine block thereby ensuring

easy maintenance and reliable operation.

Connecting rod Piston and piston rings


■ The piston design consists of a forged steel crown and nodular cast iron skirt with

pressurized skirt lubrication.

■ The three-ring pack comprises two ceramic chromium-plated, compression rings

and an oil distributor ring. This ring pack ensures optimum pressure distribution

and reduces lubricating oil consumption.

■ The combustion chamber ensures efficient combustion at all loads, while the

component temperatures are kept low.

Camshaft

Connecting rod

Piston and piston rings

26

■ The combination of design elements such as under slung crankshaft, integral air

receiver, cooling water and lubricating oil channels, short cylinder distances, and

material choice has resulted in a very rigid engine block.

■ The camshaft bearing environment forms an integral part of the engine block,

contributing to its overall stiffness and taking the large forces caused by actuation

of the fuel pumps.

■ Bolted-on engine feet facilitate installation in

all kinds of seating arrangements,

including resilient mounting.

Engine block and foundationMain bearing

13Technology Review Wärtsilä 26Technology Review Wärtsilä 26 12Technology Review Wärtsilä 26

■ The geometry of the main bearing creates

an oil film thickness which greatly

exceeds the safety margins set by bearing

manufacturers; all in accordance with the

‘Thick Pad’ philosophy of Wärtsilä.

■ Studs and nuts of bearing caps are

hydraulically tensioned.

Crankshaft

■ Special attention was given to the optimization of the various geometric

characteristics, such as cylinder distance, to achieve a space-saving solution.

■ By using three-dimensional finite-element analysis, an optimal result is achieved

with maximum overall rigidity and moderate bearing loads.

■ All criteria of the classification societies are met with large margins.

■ The engine can be delivered with a 100% power PTO

shaft at free end.

Engine block

FoundationMain bearing

Crankshaft

26

Fuel system

■ Flanged liner with tangential water flow, and

symmetrically supported at the top.

■ Anti-polishing ring removes the carbon from the

top land of the piston, thereby preventing liner

polishing. This system results in a drastic

reduction of cylinder wear, lower

lubricating oil consumption and a

clean piston.

Cylinder head

■ The use of four cylinder head studs

offers easy access for maintenance,

while requiring less space. Rigidity of

the cylinder head design ensures

adequate and uniform sealing between

cylinder head and liner.

■ Rigidity of the flame plate, prohibits

deformation of the valve seat

environment.

■ The thick flame bottom has drilled

cooling water passages to prevent

thermal stresses.

■ Low thermal loads and careful selection

of valve and seat material result in

excellent valve reliability.

Cylinder liner with anti-polishing ring


■ Fuel feed and return lines are integrated in the

fuel pump housing. This results in fewer pipe

connections leading to high reliability.

■ Shielded high pressure lines and the ‘hot box’

design contribute to safety, especially for heavy-

fuel operation.

■ The pressure pulses in the low pressure system are

very low.

The fuel injection system

■ The Wärtsilä 26 fuel injection system achieves the

optimum fuel spray pattern and droplet size.

■ Proper dimensioning of the camshaft, camshaft

bearings and rollers ensure long lifetimes and low

maintenance costs.


Fuel injection system

Cylinder head

Cylinder liner

26

Fuel system

■ The engine is equipped with a computerized engine control unit (Wärtsilä Engine

Control System,WECS) incorporating all condition monitoring and alarm functions.

■ The engine monitoring and diagnostics system can be integrated in a total engine

control, monitoring and trend-indicating system.

Engine control system

WECS 2000

■ Engine-driven lubricating oil and cooling water

pumps are an integral part of the engine.

■ All pumps are located on the free end of the engine,

allowing easy connection to the ancillary systems.

■ Using the engine-driven pumps reduces the

total investment costs for the shipowner.

Air intake and exhaust system

■ Turbochargers are designed for high compression ratios and high efficiencies at all

loads. They are fitted with cleaning devices for both compressor and turbine sides.

■ Charge air receiver is designed for minimum pressure variation and good engine

‘breathing’.

■ The exhaust system has a flow-optimized design. Its modular construction gives easy

assembly.

■ Insulation is provided by insulating panels which are easily removable for inspection.

■ The Wärtsilä 26 is equipped with a

two-stage air cooler, suitable for waste

heat recovery.

■ Housing of the two-stage air cooler is

a multifunctional casting,

incorporating also the turbocharger

support.

Engine-driven pumps


Assembly hall, Zwolle, The NetherlandsAir intake and exhaust system

Engine-driven pumps

26

The design features of the engine facilitate direct access to the vital parts.

This cuts the time needed for maintenance.

Other key aspects for easy maintenance are:

■ Reduction of the number of parts through integration of the channels for

lubricating oil and water into the engine block and other castings

■ Hydraulic tensioning of the studs for the cylinder head, connecting rod

and main bearings

■ Automatic cleaning filters

■ Easy removal of the cylinder head

Maintenance

18Technology Review Wärtsilä 26 19Technology Review Wärtsilä 26

Wärtsilä is committed to keeping your investment productive and profitable throughout the

equipment lifecycle, whether you are operating a land-based power plant or marine power

system.This calls for proactive services including performance optimization, modernization

and comprehensive operation support.

Wärtsilä provides separate service packages for its power plant and marine customers:

Energy Partner and Marine Partner, which are tailored to the specific needs and operating

conditions of these customers. In both cases, however, our aim is yours – to find a service

solution you can adapt to your needs in the most cost-efficient way. Energy Partner and

Marine Partner services cover all aspects of plant support to help you to optimize the

lifecycle costs of your equipment in the way you consider most appropriate. Our approach is

two-fold. You can either use them individually on a daily basis. Or you can use them in

combinations predefined by one of our service agreements.

Service solutions to optimize profitability

26


Parts

Top-quality original parts covering all Wärtsilä and Sulzer engines, including all

previous engine brands with first-class response times and first-class global logistics

support.

Field Service

Competent, regularly trained field professionals available round the clock

anywhere in the world through Wärtsilä’s global service network, backed up by

product specialists.

Workshop Services

Restoration of full functionality, safety and reliability with OEM (Original

Equipment Manufacturer) quality.

Technical Support

Full technical support for trouble-shooting and equipment optimization by local

dedicated contact people and specialized product company experts.

Operation Support

Full O&M documentation support and sophisticated software applications to

ensure continuous operational reliability and cost control.

Training

Standardized and tailor-made courses worldwide on all Wärtsilä and Sulzer products.

Service AgreementsWärtsilä service agreements cover all aspects of lifecycle optimization from parts

supply and daily assistance, to inspection, maintenance and even implementation

of agreed performance targets. Though comprehensive in scope, Wärtsilä service

agreements are designed to allow you to tailor them to your exact needs.

■ Parts supply agreement

■ Support agreement

■ Inspection agreement

■ Maintenance support agreement

■ Maintenance agreement

■ Management support agreement

■ Performance agreement

■ Operation & Maintenance

agreement

Main data marineDaily round-the-clock service, wherever it is needed

C

K

D BFE

H

N M

I

O M

IK

DE F

B

C

A*

GA

H

N

26

Main data

Cylinder bore 260 mm

Piston stroke 320 mm

Speed 900 – 1000 rpm

Mean effective pressure 24.3 – 23.0 bar

Piston speed 9.6 – 10.7 m/s

Fuel specification

Fuel oil 730 cST/50º C

7200 sRI/100º F

ISO 8217, category ISO-F-RMK 55

Rated power: Propulsion engines

Engine Ouput in kW/bhp at type 900 rpm 1 000 rpm

kW BHP kW BHP

6L26 1 860 2 530 2 025 2 755

8L26 2 480 3 375 2 600 3 535

9L26 2 790 3 795 2 925 3 980

12V26 3 720 5 060 3 900 5 305

16V26 4 960 6 945 5 200 7 070

18V26 5 580 7 590 5 850 7 955

Principal engine dimensions (mm) and weights (tonnes)

EngineType A* A B C D E F wet F dry

6L26 4 278 4 212 1 871 1 815 2 420 400 952 793

8L26 5 370 5 249 1 886 1 863 2 420 400 952 793

9L26 5 760 5 639 1 886 1 863 2 420 400 952 793

12V26 5 364 5 124 2 153 2 474 2 060 460 1 262 800

16V26 6 240 5 964 2 153 2 474 2 060 460 1 262 800

18V26 6 624 6 384 2 153 2 474 2 060 460 1 262 800

G H I K M N O Weight

6L26 2 866 259 920 1 420 1 074 680 - 17.2

8L26 3 646 259 920 1 420 1 122 937 - 21.8

9L26 4 036 259 920 1 420 1 122 937 - 24.0

12V26 3 035 345 1 010 1 530 1 237 1 344 1 155 29.2

16V26 3 875 345 1 010 1 530 1 237 1 344 1 155 35.2

18V26 4 295 345 1 010 1 530 1 237 1 344 1 155 38.9


Main data power

Rated power: Auxiliary engines/marine

Output at

Engine Fuel: HFO/MDO/LFOtype 900 rpm 1 000 rpm

Eng. kW Gen. kW Eng. kW Gen. kW

6L26 1 860 1 795 2 025 1 955

8L26 2 480 2 395 2 600 2 510

9L26 2 790 2 690 2 925 2 825

12V26 3 720 3 590 3 900 3 765

16V26 4 960 4 785 5 200 5 020

18V26 5 580 5 385 5 850 5 645

26

Our company, as a manufacturer and

supplier of high-quality diesel engines

is certified according to ISO 9001.

The Wärtsilä 26 is the result of systematic

efforts, and its manufacture is

certified under the Lloyd’s Register

Quality Assurance scheme.

Main data: Wärtsilä 26A

900 rpm 1000 rpm

Cylinder bore 260 mm 260 mm

Piston stroke 320 mm 320 mm

Cylinder output 280 kW/cyl. 295 kW/cyl.

Engine speed 900 rpm 1000 rpm

Piston speed 9.6 m/s 10.6 m/s

Mean effective pressure 22.0 bar 20.8 bar

Fuel specification

Fuel oil 730 cSt/50°C

7200 sRi/100°E

ISO 8217, category ISO-F-RMK 55

Natural gas

Rated power

Engine 900 rpm 1000 rpmtype Eng. kW Gen. kW Eng. kW Gen. kW

6L26 1680 1620 1770 1710

8L26 2240 2160 2360 2280

9L26 2520 2430 2655 2560

12V26 3360 3240 3540 3415

16V26 4480 4320 4720 4555

18V26 5040 4865 5310 5125

Principal engine dimensions (mm) and weight (tonnes)

EngineType A B C Weight

6L26 7378 2350 2766 36

8L26 8556 2350 2781 44

9L26 8946 2350 2781 47

12V26 8978 2470 2971 55

16V26 9818 2470 2971 64

18V26 10 051 2470 3039 71

C

B

Wärtsilä Corporation is the leading global ship power supplier and a major provider

of solutions for decentralized power generation and of supporting services.

In addition Wärtsilä operates a Nordic engineering steel company and manages

substantial share holdings to support the development of its core business.

Telephone: +31 (0)38 425 32 53Fax (marine): +31 (0)38 425 33 52

Wärtsilä NSD Nederland B.V.P.O. Box 10608, 8000 GB Zwolle Hanzelaan 95, 8017 JE ZwolleThe Netherlands

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wartsila 26

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