Annex - 2013 Interim Guidelines for Determining Minimum Propulsion Power to Maintain the Manoeuvrability of Ships in Adverse Conditions, as Amended (Resolution MEPC.232(65), as Amended by Resolutions MEPC.255(67) and MEPC.262(68))
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - Circulars - Marine Environment Protection Committee - MEPC.1/Circular.850/Rev.2 - 2013 Interim Guidelines for Determining Minimum Propulsion Power to Maintain the Manoeuvrability of Ships in Adverse Conditions... - Annex - 2013 Interim Guidelines for Determining Minimum Propulsion Power to Maintain the Manoeuvrability of Ships in Adverse Conditions, as Amended (Resolution MEPC.232(65), as Amended by Resolutions MEPC.255(67) and MEPC.262(68))

Annex - 2013 Interim Guidelines for Determining Minimum Propulsion Power to Maintain the Manoeuvrability of Ships in Adverse Conditions, as Amended (Resolution MEPC.232(65), as Amended by Resolutions MEPC.255(67) and MEPC.262(68))

0 Purpose

The purpose of these interim guidelines is to assist Administrations and recognized organizations in verifying that ships complying with 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
5.5 7.0 to 15.0 19.0

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 by the following threshold values 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 4.0 7.0 to 15.0 15.7
200 ≤ Lpp ≤ 250 Parameters linearly interpolated depending on ship's length
More than Lpp = 250 Refer to paragraph 1.1

Applicabilityfootnote

2.1 These guidelines should be applied in the case of all new ships of types as listed in table 1 of the appendix 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.

3 Assessment procedure

3.1 The assessment can be carried out at two different levels as listed below:
  • .1 minimum power lines assessment; and

  • .2 simplified assessment.

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 manoeuvrability in adverse conditions.

4.2 The minimum power lines for the different types of ships are provided in the appendix.

5 Assessment level 2 simplified assessment

5.1 The methodology for the simplified assessment is provided in the appendix.

5.2 If the ship under consideration fulfils the requirements as defined in the simplified assessment, the ship should be considered to have sufficient power to maintain 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.


Copyright 2022 Clasifications Register Group Limited, International Maritime Organization, International Labour Organization or Maritime and Coastguard Agency. All rights reserved. Clasifications Register Group Limited, its affiliates and subsidiaries and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Clasifications Register'. Clasifications Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Clasifications Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract.