HANSA 05-2019

Schiffstechnik | Ship Technology
Big data for maximising
hull performance
Hull performance remains a key element
in understanding fuel performance
and this is regardless of vessel
type. To fully understand if a vessel
is performing well it is vital that shipowners,
operators and managers have
clear benchmarks and measurements
to work from.
To begin, however, it is
important to invest in
a good antifouling or
fouling defence solution
as fouling can
significantly affect a
vessel’s fuel efficiency
and performance.
Just moderate fouling
for example can cause a
speed reduction between
10 and 18%. This leads to increased
fuel consumption as the
ship works to maintain its desired speed
and counter the increased frictional
drag caused by the biological growth.
By hard fouling fuel consumption can
be increased by up to 40%.
Once the most beneficial coating solution
has been selected it is important to
measure the operational conditions of
a vessel, and to verify and benchmark
these to get a full understanding of the
true performance of a vessel’s hull. This
is why worldwide coatings manufacturer
Hempel launched a hull performance
system called SHAPE (Systems for Hull
and Propeller Efficiency). It is founded on
the ISO 19030 framework which defines a
methodology to measure changes in hull
and propeller performance and defines a
set of relevant performance indicators for
hull and propeller maintenance.
»Shape« combines elements of hull
and propeller efficiency optimisation to
maximise the quality of performance
data analysis, allowing to deliver expert
advice and solutions to every ship operator
to maximise hull efficiency and
return on investment. The system can
monitor the long-term trends via in-service
key performance indicators (KPIs).
Simply put, »Shape« provides a clear
system to accurately compare hull and
propeller solutions by referencing simple
and transparent data and analytics.
This offers owners and interested parties
the information they need to make an informed
assessment and to take decisions
to positively impact their fuel efficiency.
Looking in more detail at the thorough
process, there are six key stages.
To begin with, the vessel’s individual
speed power reference
curves are established.
This is followed by the
collection of in-service
data, which is
then cleansed and
purified to eliminate
extreme operating
conditions and to
subtract the effects of
environmental factors.
The next stage is to perform
the precise speed loss
calculation as this is a critical
measure for understanding vessel performance
and fuel efficiency as power
increase and speed loss are directly related.
From this four KPIs are calculated:
••
Dry docking performance – calculates
the changes in hull and propeller
performance over drydocking periods
••
In-service performance – calculates
the effectiveness of the vessel’s hull
and propeller solutions
••
Maintenance trigger – calculates the
change in hull and propeller performance
over a given period between
drydocking and in-service use
••
Maintenance effect – calculates the
change in performance before and after
a maintenance event
Following this in-depth process, tangible
solutions are needed and best practice
with shipowners and operators are
shared. It is clear that vessel efficiency
can be significantly enhanced not only
by applying the correct coating solution
in the first place, but also by applying
big data intelligence to optimise hull
and propeller performance. This arms
shipowners and operators with the right
tools to compete in the current competitive
market and maximises the performance
of their vessels.
© Hempel
Author: Andreas Glud, Segment Manager,
Marine, Dry Dock, Hempel A/S
HANSA International Maritime Journal 05 | 2019
Spezialprofile
für den perfekten
Stapellauf
Als Systemlieferant entwickeln wir
gemeinsam mit Ihnen direkt einbaufähige
Stahlprofile. Wir liefern in Geometrie,
Geradheit und Werkstoffqualität
optimierte Profile. Profitieren Sie von der
Prozesssicherheit durch
• definiert konstante Schweißspalte
• reduzierte Eigenspannungen
sowie
• höherfeste Werkstoffe zur
Gewichtstreduzierung
Hoesch Spezialprofil „HP 2.0“
• definierte Radien und
definierte Flansch-Enden
• < 1/4 DIN-EN-10067:1996
• Grenzabweichung der Geradheit (0.0008 x L)
• flachkant: 0,8 mm/m
• hochkant: 0,8 mm/m
• Verdrehung: 0,5°/m
• Oberflächenfehler: bis 0,3 mm
• Zundernarben: frei (bis 0,1 mm)
Hoesch Schwerter Profile GmbH
Eisenindustriestraße 1 · D-58239 Schwerte
Ihr Ansprechpartner:
Olaf Frigge (Technische Kundenbetreuung)
Tel: +49 (0) 2304 106 637
olaf.frigge@hoesch-profile.com
www.hoesch-profile.com 55