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RT Flex
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7/16/2019 10 RT-Flex Design
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RT-flex TraininPhilosophy and Design Aspects of RT-flex
ec no ogy an erences o onven ona
RTA Engines
Chapter 10
©Wärtsilä Land & Sea Academy Page 1 Chapter 10 25-J un-08
.
Feb. 2010
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RT-flex Design Aspects History
RTA
z RTA introduced in 1982
z Over 2’800 RTA engines sold with 69’401’216 BHP / 51’030’306 kW
RT-flex
z First RT-flex workshop in 1996
z Start of first RT-flex engine in 2001 (6RT-flex58T-B / GYPSUM CENTENNIAL)
z Over 750 RT-flex engines sold with total more than 31’500’000 BHP (J une 2010)
©Wärtsilä Land & Sea Academy Page 2 Chapter 10 Feb. 2010
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RT-flex Design Aspects RTX Generations
1st eneration 2nd eneration 3rd eneration 4th generation
RTX-1 RTX-2 RTX-3 RTX-4
2008
©Wärtsilä Land & Sea Academy Page 3 Chapter 10 Feb. 2010
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RT-flex Design Aspects Characteristic Data
©Wärtsilä Land & Sea Academy Page 4 Chapter 10 Feb. 2010
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RT-flex Design Aspects Cylinder Pressures
©Wärtsilä Land & Sea Academy Page 5 Chapter 10 Feb. 2010
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RT-flex Design Aspects Power Range
©Wärtsilä Land & Sea Academy Page 6 Chapter 10 Feb. 2010
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RT-flex Design Aspects Differences RTA to RT-flex engines
©Wärtsilä Land & Sea Academy Page 7 Chapter 10 Feb. 2010
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RT-flex Design Aspects Differences to RTA engines
© Wärtsilä Land & Sea Academy Page8
Chapter 10 25-J un-08
©Wärtsilä Land & Sea Academy Page 8 Chapter 10 Feb. 2010
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RT-flex Design Aspects Comparison Table
Conventional engine 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 forexhaust valve activation
One activating pump perc linde
Servo pumps on supply unit
„Storing“ of servo oil pressure - Servo rail
Timing of exhaust valve Valve cam on camshaft WECS-9520 / VCU
Fuel pump actuator Regulating power/speed Keeping fuel rail pressure
Electronic governor Releasing fuel pump position Releasing fuel command too e ac ua or
Power/speed control by Fuel pump Fuel quantity piston
©Wärtsilä Land & Sea Academy Page 9 Chapter 10 Feb. 2010
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RT-flex Design Aspects Comparison Table
Conventional engine 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 camsactin on neumatic valves of
Backup panels delivermanoeuvrin si nals and fuel
the engine control
commands to WECS inputs,independent from the RCinputs channels
Load signal RC receives load signal fromangle transmitter on
intermediate shaft
WECS supplies a fuelcommand feedback as load
signal to the RC systemVIT, VEC Functions provided in RC
systemFunctions (plus VEO) includedin WECS
Wiring from engine to external Individual cables Bus-system
©Wärtsilä Land & Sea Academy Page 10 Chapter 10 Feb. 2010
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RT-flex Design Aspects Why Common-Rail
Possibilit ies to reduce emissions
Reduced fuel consumption at part load
ower m n mum eng ne speeBetter manoeuvrabil it
©Wärtsilä Land & Sea Academy Page 11 Chapter 10 Feb. 2010
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RT-flex Design Aspects Advantages of RT-flex
Wärtsilä 6 RT-flex58T-B MV Gypsum Centennial
0.50
0.35
0.40
0.45
F S N ] HFO
380 cSt
3% sulphur
0.25
0.30
k e N u m b e r [
0.1% ash
OFF Aux . Blow er ON
0.10
0.15
.
F
i l t e r S m o
Co n ven tio n al lo w s eed en in e
Smoke visibi l i ty l imit
0.00
0.05
0 10 20 30 40 50 60 70 80 90 100
6RT-flex 58T-B w ith com mo n rail
©Wärtsilä Land & Sea Academy Page 12 Chapter 10 Feb. 2010
ng ne oa
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RT-flex Design Aspects Advantages of RT-flex
©Wärtsilä Land & Sea Academy Page 13 Chapter 10 Feb. 2010
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RT-flex Design Aspects IMO NOx Limits
©Wärtsilä Land & Sea Academy Page 14 Chapter 10 Feb. 2010
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RT-flex Design Aspects Engine Numbering and Designations
Turbocharger 1 Turbocharger 2
Cylinder Numbering
DRIVING END FREE END
©Wärtsilä Land & Sea Academy Page 15 Chapter 10 Feb. 2010
rus earng a s a n earng um erng
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RT-flex Design Aspects Engine Numbering and Designations
FUEL SIDE EXHAUST SIDE
Clockwise RotationCounter-clockwise Rotation
©Wärtsilä Land & Sea Academy Page 16 Chapter 10 Feb. 2010