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MANAJEMEN RISIKO
ESSAY BASED ON MTU GUEST LECTURE
M CHINERY B SIC DESIGN
Prepared by:
Mohammad Hafidh Rahadiyan
42111 1 15
FACULTY OF MARINE TECHNOLOGY
DEPARTMENT OF MARINE ENGINEERING
INSTITUT TEKNOLOGI SEPULUH NOPEMBER
2 14
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8/10/2019 MTU High Speed Diesel for Workboat
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| Essay based on MTU Guest Lecture|
Mohammad Hafidh Rahadiyan - 4211101015
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MTU High Speed Diesel Engine for Workboat to Improve Fuel
Economy, Performance
and Dependability
The high speed diesel engine is needed when there were some
considerations mentioned as
follows, they are limited Engine Room, limited propeller
diameter (shallow draught),
combined propeller system, and high performance operation. The
examples of using high
speed diesel engine are vesels like catamaran, hydrofoil,
jetfoil, and patrol vessel.
A workboat is a vessel designed to perform useful tasks at sea.
Work boats come in a variety
of forms, depending upon their particular employment. Workboat
has some requirement to be
fulfilled, there are must be advanced in maneuver, has twin
screw (Fixed Pitch Propeller) or
Controllable Pitch Propeller (depending on its area of
operation), compact propulsion system,
has high push force for bollard pulls, Power Take-off
aplication. While Anchor Handling Tug
Supply (AHTS) vessels are mainly built to handle anchors for oil
rigs, tow them to location,
anchor them up and, in a few cases, serve as an Emergency Rescue
and Recovery Vessel
(ERRV) and also used to transport supplies to and from offshore
drilling rigs.
Although every tug has a particular mission and area of
operation, the following general
observation can be made:
High engine load (>70% of rated engine power) occurred only
4% of the time and less
than 1% of the time at >90% of rated engine power.
Low engine load(
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| Essay based on MTU Guest Lecture|
Mohammad Hafidh Rahadiyan - 4211101015
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o Does the engine manufacturer allow unrestricted operation at
the specified
rated power?
o Does the engine offer sufficient torque margin from idle to
rated speed to
allow safe vessel manoeuvring also in reverse flow
condition?Some turbocharging techniques such as variable turbine
geometry or sequential turbo
charging offer improved torque margins compared with
conventional turbocharged
diesel engines. The torque margin from idle speed up to
approximately 70% of engine
speed must be evaluated.
Emissions
Compliance with exhaust emission regulations is mandatory for
commercial
operators. Visible smoke at steady-state operation is no longer
acceptable with
modern diesel engines, and even normal acceleration is expected
to be free of smoke
in harbours or coastal areas.
Low load operation and load cycling
This has a significant impact on the service intervals and
lifetime of a diesel engine, if
the engine is not designed for such operating conditions.
Critical aspects of low load
operation are the precise control of the requested fuel quantity
and the protection
against cooling down to avoid incomplete combustion leading to
formation of PM
(soot) and HC emissions.
Load cycling has to be considered when defining turbocharger
specifications and
maintenance schedules. They also have impact on engine
structural load due to
uneven temperature distribution.
Time between Overhaul
Another factor that contributing for main engine propulsion
criteria/requirement was
its extended time between overhauls. For example TBO one MTU
engines has been
30,000 hours, compared to 24,000 hours or less for competitive
engines. That can
translate into an additional 12 to 18 months between
overhauls.
