1 Introduction
1.1 These Guidelines provide the methods to calculate the reference
lines for use with operational carbon intensity indicators, and the ship type
specific carbon intensity reference lines as referred to in regulation
28 of MARPOL Annex
VI.
1.2 One reference line is developed for each ship type to which regulation
28 of MARPOL Annex
VI applies, based on the specific indicators stipulated in 2022
Guidelines on operational carbon intensity indicators and the calculation
methods (G1) developed by the Organization, ensuring that only data from
comparable ships are included in the calculation of each reference line.
2 Definition
2.1 MARPOL
means the International Convention for the Prevention of Pollution from Ships,
1973, as modified by the Protocols of 1978 and 1997 relating thereto, as amended.
2.2 IMO DCS means the data collection system for fuel oil
consumption of ships referred to in regulation
27 and related provisions of MARPOL Annex
VI.
2.3 For the purpose of these Guidelines, the definitions in MARPOL Annex
VI, as amended, apply.
2.4 An operational carbon intensity indicator (CII) reference line is defined as a
curve representing the median attained operational carbon intensity performance, as
a function of Capacity, of a defined group of ships in year of 2019.
3 Method to develop the CII reference lines
3.1 Given the limited data available for the year of 2008, the operational carbon
intensity performance of ship types in year 2019 is taken as the reference.
3.2 For a defined group of ships, the reference line is formulated as follows:
where CIIref is the reference value of year 2019,
Capacity is identical with the one defined in the specific carbon
intensity indicator (CII) for a ship type, as shown in Table. 1; a and
c are parameters estimated through median regression fits, taking the
attained CII and the Capacity of individual ships collected through IMO DCS in year
2019 as the sample.
4 Ship type specific operational carbon intensity reference lines
The parameters for determining the ship type specific reference lines, for use in
Eq.(1), are specified as follows:
Table 1: Parameters for determining the 2019 ship type specific reference
lines
Ship type
|
Capacity
|
a
|
c
|
Bulk carrier
|
279,000 DWT and
above
|
279,000
|
4745
|
0.622
|
less than 279,000
DWT
|
DWT
|
4745
|
0.622
|
Gas
carrier
|
65,000 and above
|
DWT
|
14405E7
|
2.071
|
less than 65,000
DWT
|
DWT
|
8104
|
0.639
|
Tanker
|
DWT
|
5247
|
0.610
|
Container
ship
|
DWT
|
1984
|
0.489
|
General
cargo ship
|
20,000 DWT and
above
|
DWT
|
31948
|
0.792
|
less than 20,000
DWT
|
DWT
|
588
|
0.3885
|
Refrigerated
cargo carrier
|
DWT
|
4600
|
0.557
|
Combination
carrier
|
DWT
|
5119
|
0.622
|
LNG carrier
|
100,000 DWT and
above
|
DWT
|
9.827
|
0.000
|
65,000 DWT and above, but
less than 100,000 DWT
|
DWT
|
144779E10
|
2.673
|
less than 65,000
DWT
|
65,000
|
14479E10
|
2.673
|
Ro-ro cargo ship (vehicle carrier)
|
57,700 GT and above
|
57,700
|
3672
|
0.590
|
30,000 GT and above, but less than 57,700 GT
|
GT
|
3672
|
0.590
|
Less than 30,000 GT
|
GT
|
330
|
0.329
|
Ro-ro cargo ship
|
GT
|
1967
|
0.485
|
Ro-ro passenger ship
|
Ro-ro passenger ship
|
GT
|
2023
|
0.460
|
High-speed craft designed to SOLAS chapter X
|
GT
|
4196
|
0.460
|
Cruise passenger ship
|
GT
|
930
|
0.383
|