RT-flex Training

1. RT-flex Training

Philosophy and Design Aspects of RT-flex
Technology and Differences to Conventional
RTA Engines
Chapter
10
Rev. 0
25.06.08
© Wärtsilä Land & Sea Academy
Page 1
Chapter 10
25-Jun-08

2. History

RT-flex Design Aspects
History
History of
RTA
RTA introduced in 1982
Over 2’800 RTA engines sold with 69’401’216 BHP / 51’030’306 kW
RT-flex
First RT-flex workshop in 1996
Start of first RT-flex engine in 2001 (6RT-flex58T-B / GYPSUM CENTENNIAL)
Over 700 RT-flex engines sold with total more than 30’000’000 BHP (Dec. 08)
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3. RTX Generations

RT-flex Design Aspects
1st generation
RTX-1
2nd generation
RTX-2
RTX Generations
3rd generation
RTX-3
4th generation
RTX-4
2008
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4. Characteristic Data

RT-flex Design Aspects
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Characteristic Data
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5. Cylinder Pressures

RT-flex Design Aspects
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Cylinder Pressures
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6. Power Range

RT-flex Design Aspects
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Power Range
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7. Differences RTA to RT-flex engines

RT-flex Design Aspects
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Differences RTA to RT-flex engines
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8. Differences to RTA engines

RT-flex Design Aspects
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Differences to RTA engines
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9. Comparison Table

RT-flex Design Aspects
Comparison Table
RTA
RT-flex
Developing fuel oil pressure
One fuel pump per cylinder
Fuel pumps on supply unit
„Storing“ of fuel oil pressure
-
Fuel rail
Timing of injection
Fuel cam on camshaft
WECS-9520 / ICU
Developing pressure for
exhaust valve activation
One activating pump per
cylinder
Servo pumps on supply unit
„Storing“ of servo oil pressure
-
Servo rail
Timing of exhaust valve
activation
Valve cam on camshaft
WECS-9520 / VCU
Fuel pump actuator
Regulating power/speed
Keeping fuel rail pressure
Electronic governor
Releasing fuel pump position
to the actuator
Releasing fuel command to
WECS
Power/speed control by
Fuel pump
Fuel quantity piston
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Page 9 Chapter 10
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10. Comparison Table

RT-flex Design Aspects
Comparison Table
RTA
RT-flex
Timing of starting air
Starting air distributor
WECS-9520
Reversing
Reversing of cam
WECS-9520
Alarm and monitoring system
External (internal: OSC-3)
External
Emergency control
By mechanic shaft and cams
acting on pneumatic valves of
the engine control
Backup panels deliver
manoeuvring signals and fuel
commands to WECS inputs,
independent from the RC
inputs channels
Load signal
RC receives load signal from
angle transmitter on
intermediate shaft
WECS supplies a fuel
command feedback as load
signal to the RC system
VIT, VEC
Functions provided in RC
system
Functions (plus VEO) included
in WECS
Wiring from engine to external
Individual cables
Bus-system
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Page 10
Chapter 10

11. Why Common-Rail

RT-flex Design Aspects
Why Common-Rail
Drastic smoke reduction at part load
Possibilities to reduce emissions
Reduced fuel consumption at part load
Lower minimum engine speed
Better manoeuvrability
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Page 11
Chapter 10

12. Advantages of RT-flex

RT-flex Design Aspects
Advantages of RT-flex
Wärtsilä 6 RT-flex58T-B MV Gypsum Centennial
Smoke measurement on combinator curve during sea trials
0.50
Filter Smoke Number [ FSN ]
0.45
0.40
HFO
0.35
380 cSt
3% sulphur
0.1% ash
0.30
ON
0.25
OFF Aux. Blower
0.20
Smoke visibility limit
0.15
Conventional low speed engine
0.10
0.05
6RT-flex 58T-B with common rail
0.00
0
10
20
30
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40
50
60
Engine Load [% ]
Page 12
70
80
90
Chapter 10
100

13. Advantages of RT-flex

RT-flex Design Aspects
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Advantages of RT-flex
Page 13
Chapter 10

14. IMO NOx Limits

RT-flex Design Aspects
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IMO NOx Limits
Page 14
Chapter 10

15. Engine Numbering and Designations

RT-flex Design Aspects
Engine Numbering and Designations
Turbocharger 1
Turbocharger 2
1
2
3
4
5
6
7
Cylinder Numbering
DRIVING END
FREE END
Thrust Bearing Pads
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Main Bearing Numbering
Page 15
Chapter 10

16. Engine Numbering and Designations

RT-flex Design Aspects
Engine Numbering and Designations
EXHAUST SIDE
FUEL SIDE
Clockwise Rotation
Counter-clockwise Rotation
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Page 16
Chapter 10