0 Purpose
The purpose of these Guidelines is to assist Administrations and recognized
organizations in verifying that ships, complying with Energy Efficiency Design Index
(EEDI) requirements set out in regulations on energy efficiency for ships, have
sufficient installed propulsion power to maintain the manoeuvrability in adverse
conditions, as specified in regulation 21.5 of chapter 4 of MARPOL Annex
VI.
1 Definition
1.1 "Adverse conditions" mean sea conditions with the following
parameters:
| Significant wave height
hs, m
|
Peak wave period TP,
s
|
Mean wind speed Vw,
m/s
|
| 6.0
|
7.0 to 15.0
|
22.6
|
JONSWAP sea spectrum with the peak parameter of 3.3 is to be considered for coastal
waters.
1.2 The following adverse condition should be applied to ships defined as the
following threshold value of ship size:
| Ship length, m
|
Significant wave height
hs, m
|
Peak wave period TP,
s
|
Mean wind speed Vw,
m/s
|
| Less than 200
|
4.5
|
7.0 to 15
|
19.0
|
| 200 ≤ Lpp ≤ 250
|
Parameters linearly interpolated depending
on ship's length
|
| More than Lpp = 250
|
Refer to paragraph 1.1
|
2 Applicability footnote
2.1 These Guidelines should be applied in the case of all new ships of types
as listed in table 1 of appendix 1 required to comply with regulations on energy
efficiency for ships according to regulation 21 of MARPOL
Annex VI.
2.2 Notwithstanding the above, these Guidelines should not be applied to
ships with non-conventional propulsion systems, such as pod propulsion.
2.3 These Guidelines are intended for ships in unrestricted navigation; for
other cases, the Administration should determine appropriate guidelines, taking the
operational area and relevant restrictions into account.
2.4 These Guidelines are applied in maximum summer load condition.
3 Assessment procedure
3.1 The assessment can be carried out at two different levels as listed
below:
3.2 The ship should be considered to have sufficient power to maintain the
manoeuvrability in adverse conditions if it fulfils one of these assessment levels.
4 Assessment level 1 – minimum power lines assessment
4.1 If the ship under consideration has installed power not less than the
power defined by the minimum power line for the specific ship type, the ship should be
considered to have sufficient power to maintain the manoeuvrability in adverse
conditions.
4.2 The minimum power lines for the different types of ships are provided in
appendix 1.
5 Assessment level 2 – minimum power assessment
5.1 The methodology for the minimum power assessment is provided in appendix
2.
5.2 If the ship under consideration fulfils the requirements as defined in
the minimum power assessment, the ship should be considered to have sufficient power to
maintain the manoeuvrability in adverse conditions.
6 Documentation
Test documentation should include at least, but not be limited to, a:
-
.1 description of the ship's main particulars;
-
.2 description of the ship's relevant manoeuvring and propulsion systems;
-
.3 description of the assessment level used and results; and
-
.4 description of the test method(s) used with references, if applicable.