The aim of this report is to provide an overview of the key discussions and outcomes of the 4th session of the IMO Ship Design and Construction Sub-Committee (SDC 4) which is relevant to the IMarEST’s work.
Three working groups (WG) were formed:
- WG1 - Working Group on Subdivision and Damage Stability
- WG2- Working Group on Intact Stability
- WG3 - Working Group on Fire Protection (Guidelines for use of Fibre Reinforced Plastic (FRP) within ship structures)
Key outcomes of SDC 4
The Sub-Committee had to consider various agenda items related to passenger ships. These issues are not presented here in detail.
Amendments to SOLAS regulations II-1/6 and II-1/8-1
Explanatory Notes to SOLAS chapter II-1 subdivision and damage stability regulations
The Sub-Committee considered the report of the Correspondence Group (CG) providing information on the development of the revised Explanatory Notes to SOLAS Chapter II-1 on subdivision and damage stability regulations. These notes intend to provide clarifications on the application of individual SOLAS chapter II-1 regulations and are focused on the regulations related to passenger ships addressing stability, damage stability, watertight integrity, inspection of watertight doors, prevention and control of water ingress, etc.
These notes will be issued as a new MSC resolution with applicability to ships built on or after 1 January 2020 which is the same as the amendments to SOLAS chapter II-1 subdivision and damage stability regulations.
Finalization of second generation intact stability criteria
The Sub-Committee considered the report of the Intact Stability (IS) Correspondence Group and following a discussion on a number of submitted documents, the Sub-Committee decided to establish a WG to consider the draft amendments to the 2008 IS Code regarding the draft vulnerability criteria for each of the five stability failure modes in particular:
- Pure loss of stability failure mode (method to establish equivalence between regular and irregular waves)
- Parametric roll stability failure mode (method of presentation of stability variation in waves)
- Dead ship condition stability failure mode (vulnerability criteria)
- Excessive accelerations (roll damping linearization method)
- General calculation methods (inertial properties of ships with specific hull form parameters, evaluation of roll wave moment and coefficients, critical roll frequency)
The WG concluded that additional work is required to address discrepancies of the vulnerability criteria and therefore a CG was established to address outstanding items.
Mandatory instrument and/or provisions addressing safety standards for the carriage of more than 12 industrial personnel on board vessels engaged on international voyages
The Sub-Committee had instructions to develop a mandatory instrument for the carriage of more than 12 industrial personnel on board vessels engaged on international voyages to address safety standards due to the fact that the offshore sector is growing. Because no slots were available for a WG, it was decided that a CG should be established, to develop a new SOLAS chapter and a new Code, taking into account the existing requirements of SOLAS and the IMO framework.
If you are interested in seeing the proposed terms of reference and/or participation on the CG, please e-mail for more details.
Guidelines for use of Fibre Reinforced Plastic (FPR) within ship structures
The WG on Fire Protection managed to finalize the draft interim guidelines for use of Fibre Reinforced Plastic (FRP) within ship structures. If approved by MSC 98, an MSC Circular will be published.
The draft interim guidelines aim to address fire safety standards of ships using FRP elements within their integrated structures without compromising the level of fire safety as described in SOLAS provisions. The chapters that are covered in the draft interim guidelines are:
- Fire safety issues
- Issues other than fire safety
- FRP composite materials and compositions used in shipbuilding
- Recommendations regarding the assessment
- Fire testing of FPR composite
- Example of assessment procedure
The draft interim guidelines will be reviewed within four years after their approval in order to make necessary amendment based on experience gained through application.
If you are interested to look into the full set of the draft interim guidelines for use of FRP within ship structure, please e-mail for more details.
Revised SOLAS regulations II-1/3-8 and associated guidelines and new guidelines for safe mooring operations for all ships
The Sub-Committee decided to re-establish the CG on Safe Mooring Operations in order to progress the work intersessionally and to further consider:
- the design and selection of equipment for safe mooring arrangements
- the draft new guidelines for safe mooring operations on all ships
- to develop separate guidelines on safe mooring operations, taking into account the need for any additional guidance on selection, identification, inspection, maintenance and use of mooring lines.
The IMarEST is looking to strengthen its technical team with volunteers who wish to participate in the IMO work and have an expertise in Ship Design and Construction and Ship Safety Equipment. If you are the person we are looking for, please e-mail .
Future IMO meetings
MSC 98 is scheduled to take place on 7 – 16 June 2017
MEPC 71 is rescheduled to take place on 3 – 7 July 2017
CCC 4 is scheduled to take place on 11 – 15 September 2017
III 4 is rescheduled to take place on 25 – 29 September 2017