wartsila 26
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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
7Technology Review Wärtsilä 266Technology Review Wärtsilä 26
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
9Technology Review Wärtsilä 268Technology Review Wärtsilä 26
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
11Technology Review Wärtsilä 2610Technology Review Wärtsilä 26
■ 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
14Technology Review Wärtsilä 26
■ 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.
15Technology Review Wärtsilä 26
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
17Technology Review Wärtsilä 2616Technology Review Wärtsilä 26
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
21Technology Review Wärtsilä 2620Technology Review Wärtsilä 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
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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
23Technology Review Wärtsilä 2622Technology Review Wärtsilä 26
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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