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MARINE ENGINEERI NG MARINE NG by RETHINAVEL PANDI Blog that brings all the description of MARINE ENGINEERING under single roof........
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Saturday, 19 January 2013
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CATEGORIES Wartsila v/s Wartsila v/s MAN Marine Engines- Who’s is the best ?
‘Take Risk's in life..if you win you can LEAD...if you lose you can GUIDE.’
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The stronger the marine engine, the better is the ship’s propulsion power and speed. When it comes to selecting marine engines for ships, there are only a few countable names in the market, including MAN B&W and Wartsila.In this article we are going to compare the two most powerful marine engine brands in the maritime industry.As discussed in one of our previous articles, the Most Popular Marine Propulsion Engines , Engines , MAN Diesel Turbo (previously known as MAN B&W) and Wartsila (Previously known as SULZER) are the two front-runner giants for supplying propulsion solution to the shipping industry.Wartsila & MAN both are in fact two rivals who have the best products and R&D in the industry. In this article, we will compare the different propulsion technologies provided by these two companies and will list out which technology has got the edge over the other.Note: This comparison is derived and compiled after taking views from professional marine engineers who have worked on both of these engines. However, this is not a yardstick for selecting marine engines for a ship.
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Intelligent
RT Flex- A
ME Engine-
Wartsila- For
Engine
complete
Complete
installing an
electronically
electronically
Intelligent engine
controlled engine controlled engine
technology in 2001.
with common rail integrated with
Prior to MAN
system
hydraulic control.
(2003).
Fuel Injection
Common rail
Hydraulic actuated
Wartsila- For
System
Electronic
Electronic Control
integrating Delta
control with
Injection system
control with 3
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Delta Injection
injectors controlled
System
independently for
FREE MARINE BOOKS
Today's OIL Rate /Barrel Brent Crude Oil
Exhaust Valve Electronically
Camshaft operated
MAN- For
Control
controlled
Exhaust valve for
integrating a smart
variable exhaust
reliable operation
mechanical exhaust
valve timing
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Marine Diesel Engines
Fuell Inject Fue Injectors ors Con Conven ventio tional nal
Zero Sac Volume
MAN- Slide type
marine engineer world
fuel injectors
type fuel injectors
fuel injector reduces
with slide valve
after burning and
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Nautical institute and MARS MAGAZINE
Wartsila
MAN Diesel Turbo
emission Who gets the
SULZER S pi ll , s uc ti on
Jerk type plunger
EDGE? MAN- Super VIT
valve controlled
barrel controlled
with independent
pump with VIT
pump with Super
injection timing
VIT
control w.r.t fuel
Current Position of vessels
index.
International Maritime Organization General Engineering Knowledge Notes
Starting Air
Starting air valve Starting air valve
system
opened by 30 bar open by 30 bar air
Additional safety
air and a closing
and shut by spring.
provided in positive
Code of Safe working Practices for Merchant Seamen Seamen's Clubs and ports network worldwide
Wartsila-
supply for
Bursting disc
closing and relief
positive shut
provided to avoid
valve for reliability
along with
overpressure during
during
spring.
explosion
manoeuvring.
Cheeky Quotes
avoid
A classic is something that everybody wants to have read and nobody wants to read.
overpressure
Mark Twain
A relief valve in air manifold to
World Clock
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during starting airline explosion.
mark twain
Piston and
Convex shaped
OROS type Piston
Rings
piston with Jet
for better combustion piston, the
Shaker cooling.
area and reduction in Maximum piston
Chromium
piston temperature.
temperature reduces
Posts
coated Piston
Controlled Pressure
by 90°C.
All Comments
ring.
Relief type top piston With CPR ring, ring.
MAN-With OROS
better pressure distribution on liner
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Wartsila- Better cooling and
with mid layer
insulation increases
insulation.
Cylinder liner Life
Main Bearing White metal
Rethinavel pandi
Bore cooled liner.
bore cooled Liner
Tri metal bearing
MAN-Tri metal
bearing lined on
with high load
bearing with long
thin back.
carrying capacity.
life and better embed ability.
Crosshead
12-15 bar
Small size bearing
Wartsila-Elevated
pressure from
with oil wedges to
pressure ensures
separate pump
retain oil which is
better lubrication at
supplied to
supplied by normal
high load.
bigger size plain
system pressure.
A back up line is
bearing. 119 have me in circles
provided in case of failure of crosshead
View all
pump.
Cylinder
Electronically
Alpha Adaptive
Lubrication
controlled Pulse
Cylinder Lubrication different inputs like
MAN- ACC with
Lubrication
control system
System with
allowing blending of load index provide
metered quantity
cylinder oil for
better neutralizing
injection
different grade of
features.
sulphur content and
sulphur in fuel
Drive
Gear driven with
Chain driven with 2
MAN- Chain drives
timing gear
chains driving a
are cheaper, lighter
driving the
camshaft
and easier to
camshaft
maintain and duplication provides backup.
Turbocharging Prefers Axial
Variable Turbine
turbocharger with Angle turbocharger
MAN-VTA allows engine to run
constant pulse
provides better
without auxiliary
system.
operation at all load
blower at low load
range
operation.
W seat for better
MAN- W seat
Valve seat with
operation and
allows cooling of
Nimonic and
increased time
exhaust valve
Exhaust Valve Cobentional
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a package of design
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From the above comparison, it can be seen that MAN has an edges over Wartsila by a thin margins. However, with the world’s most powerful marine engine (Wärtsilä RT-flex96C) in its basket, Wartsila is one company that doesn’t have to prove anything. Dear readers its just an study made under certain cases so there may be any tentative results......for more articles subscribe to my post.......
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Wartsilav/s MAN Marine Engines Who’s is the best... Ball piston engine - a high efficient power ... Free Piston Engine TheFree Piston ... ► 2012 (56)
Posted by Rethinavel pandi at 05:13:00 Reactions: 8 comments
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Friday, 18 January 2013
Ball piston engine - a high efficient power Ball piston engine The original concept was introduced in 1990. Then it utilised a modified version of the tried and tested otto cycle. The number of strokes were 4, 8 and 12 or more. There may be one or more pistons. Each of them is inside a cylinder. A hot gas or a gas under pressure is introduced. The machine design concept is applicable as a compressor, pump, motor, or engine. This engine is based on spherical ball pistons and hence the moving part count is less, power to weight ratio is high, f valve train and water cooling systems are eliminated and there is a good dynamic balance. The inertial loads(which contributes to sliding friction) has been completely eliminated by a novel kinematic design. a small clearance is kept on the ball piston to avoid the use of piston rings for reducing the leakage. As a result, there is a choked flow across the piston. The above described features provide the scope for a engine with higher efficiency than conventional piston engines.The silicon nitride ball pistons technology has been utilized by the engine preventing the need of a large developmental effort.
Ball piston engine - a high efficient power A patented new power machine concept has been designed and analyzed for production, and proof of principle subscale tests have been performed, with positive results. The machine design concept is applicable as a compressor, pump, motor, or engine. Simplicity of design based on spherical ball pistons enables a low moving part count, high power to weight ratio, elimination of valve train and water cooling systems, and perfect dynamic balance.The new design concept utilizes novel kinematic design to completely eliminate inertial loads that would contribute to sliding friction. Also low leakage is maintained without piston rings by using a small clearance on the ball piston, resulting in choked flow past the ball. These features provide the potential for an engine with higher efficiency than conventional piston engines. The engine design utilizes existing recent technology to advantage, such as silicon nitride ball pistons, so a large development effort is not required.
The further more information can be read from the following links......keep reading the blogs.... http://papers.sae.org/970066/ http://www.ballpistonengine.com/ http://www.convergence-eng.com/project_f...esting.doc for a presentation, visit this link: http://www.scribd.com/doc/11835319/Ball-Piston http://www.scribd.com/doc/29379090/The-B...ton-Engine
Reference: http://www.seminarprojects.com/Thread-ball-piston-engine-a-high-efficient-power? pid=19342#pid19342#ixzz0w1qOFneT Reference: http://www.seminarprojects.com/Thread-ball-piston-engine-a-high-efficient-power? pid=19342#pid19342#ixzz0w1qgJvRb Posted by Rethinavel pandi at 19:38:00 Reactions: 1 comment
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Free Piston Engine The Free Piston Engine is a combination of reciprocating engine and rotary turbine. It is called free piston engine because the freedom motion for Mechanical linkage which gives variable stroke according to load. ADVANTAGES 1. Mechanical simplicity 2. Less power to weight ratio 3. Lower turbine operating tempeatures 4. Multi fuel capability 5. Flexibility and reliability 6. Easy starting and control LIMITATIONS 1. Poor fuel economic 2. Less stability 3. Poor part load efficiency 4. High combustine rates 5. Reduction gearing APPLICATIONS 1. Free piston engines are widely used as submarine air compressor units 2. These engines are suitable for power generation in medium power range 3. Free piston engine have been tride in ship propulsion, road and rail traction and even in aircrafts. 4. It is used in mixed gas steam cycle Posted by Rethinavel pandi at 19:32:00 Reactions: 0 comments
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