Transcript
Derating Change of Engine SMCR
Derating
Saving potential
A vessel’s engine and propeller are optimised and designed for a given opera-
10-12% fuel saving potential
tional and max. speed. If the operational
based on new optimisation speed
speed of the vessel is generally lower than the one originally optimised for, it may be
The above saving is based on a reduction
beneficial to consider derating of the main
of 10-15% of the max. speed at SMCR.
engine and propeller. Fuel saving originates from Derating as a retrofit product offers reduc-
Optimisation of the engine and propeller
Utilisation of the latest engine tuning
Utilisation of state-of-the-art high efficien-
layout to the actual operational speed
tion of the total fuel consumption by improving the match between the operational
methods
speed and optimisation speed.
cy propeller design.
Derating is usually an attractive option for fuel oil savings if a reduction of 10-15% of the max. speed at SMCR can be accept-
De-rating benefits
ed. A standard derating calculation made
by MAN Diesel & Turbo takes into account
New refurbished turbocharger(s)
the benefit gained from exchanging the
Increased overall propulsion efficiency with new propeller
original propeller with a new propeller having an optimised diameter designed for the required optimising speed and reduced max. speed.
Reduced SFOC at optimisation load
Less power demand for same vessel speed.
Derating Change of Engine SMCR
Vessel and Engine Specific Study
In order to change the engine SMCR, a
In order to clarify the full optimisation poten-
number of engine and turbocharger com-
tial of an actual vessel (series), it is necessary
ponents must be exchanged along with
to carry out a ‘Vessel and Engine Specific
retrofit of a new optimised propeller match-
Study’, which establishes the optimisation
ing the chosen SMCR.
potential and possible tuning methods in detail. The study will cover the actual ves-
A derating project includes:
Specification of new operating/optimisa-
sel and possible sister vessels and result in one or more solutions for fuel reduction. As
tion speed and max. speed of the vessel
the study is vessel specific, MAN Diesel &
Engineering
Turbo will have to charge an engineering fee
Design of new propeller
to cover the comprehensive calculation and
Derating of the engine
design work involved. If the derating project
Rematching of turbocharger(s)
is ordered based on the ‘Vessel and Engine
On board NOx measurements (parent
Specific Study’, the engineering fee will be
engine)
considered as a down payment and as such
New technical file
be deducted from the project price.
Torsional vibration calculation report
Shaft alignment calculation report.
The Vessel and Engine Specific Study includes
Price indication
A rough budget price estimate for derating
Specification of a new operational and max. speed of the vessel
Full engine derating potential is investigat-
- 12K98MC) depending on bore size and
Turbocharger rematching is included
number of cylinders and turbochargers.
of an engine and a new optimised propel-
ed – one or more solutions are described
ler is approx. EUR 0.9-3.0 million (5S50MC
Propeller performance for new propeller at new rating
An example of a budget price estimate
Torsional vibration calculation analysis
for a derated 6S70MC, including new
Torsional vibration countermeasures are
optimised propeller is: ~EUR 1.3 million
decided upon, designed and included in the project
Quotation for engine derating
Quotation for new propeller.
All data provided in this document is non-binding. This data serves informational purposes only and is especially not guaranteed in any way. Depending on the subsequent specific individual projects, the relevant data may be subject to changes and will be assessed and determined individually for each project. This will depend on the particular characteristics of each individual project, especially specific site and operational conditions · 3010-0238-00ppr Jan 2013 Printed in Denmark
Derating includes
MAN Diesel & Turbo PrimeServ Copenhagen Teglholmsgade 41 2450 Copenhagen SV, Denmark Phone +45 33 85 11 00 Fax +45 33 85 10 49
[email protected] www.mandieselturbo.com Emergency phone after office hours: Spare Parts +45 40 19 35 01 Technical Service +45 20 48 94 40 MAN Diesel & Turbo PrimeServ Copenhagen Forwarding & Receiving Teglholmsgade 41 Teglholmsgade 2450 Copenhagen 35 SV, Denmark 2450 Copenhagen Phone +45 33 85 SV, 11 00 Denmark Phone +45 33 85 10 Fax 11 00 49 Fax
[email protected] +45 33 85 10 16
[email protected] www.mandieselturbo.com
