RULES FOR THE CLASSIFICATION AND CONSTRUCTION OF SEA-GOING SHIPS PART IV STABILITY AND SUBDIVISION 2020 January GDAŃSK RULES FOR THE CLASSIFICATION AND CONSTRUCTION OF SEA-GOING SHIPS prepared and edited by Polski Rejestr Statków, hereinafter referred to as PRS, consist of the following Parts: Part I – Classification Regulations Part II – Hull Part III – Hull Equipment Part IV – Stability and Subdivision Part V – Fire Protection Part VI – Machinery Installations and Refrigerating Plants Part VII – Machinery, Boilers and Pressure Vessels Part VIII – Electrical Installations and Control Systems Part IX – Materials and Welding. Part IV – Stability and Subdivision – January 2020 was approved by PRS Executive Board on 17 December 2019 and enters into force on 1 January 2020. From the entry into force, the requirements of Part IV – Stability and Subdivision apply, in full, to new ships. With respect to existing ships, the requirements of Part IV – Stability and Subdivision are applicable within the scope specified in Part I – Classification Regulations. The requirements of Part IV – Stability and Subdivision are extended by the following Publications: Publication 6/P – Stability, Publication 14/P – Principles of Approval of Computer Programs, Publication 16/P – Loading Guidance Information, Publication 32/P – The Requirements for the Stowage and Securing of Cargo on Sea-going Ships, Publication 66/P – Onboard Computers for Stability Calculations, Publication 76/P – Stability, Subdivision and Freeboard of Passenger Ships Engaged on Domestic Voyages, Publication 94/P – Subdivision and Damage Stability of New Oil Tankers, Chemical Tankers and Gas Carriers. © Copyright by Polski Rejestr Statków S.A., 2020 PRS/OP, 12/2019 CONTENTS Page 1 General ................................................................................................................................................................ 5 1.1 Application .................................................................................................................................................. 5 1.2 General ........................................................................................................................................................ 5 1.3 Definitions ................................................................................................................................................... 5 1.4 Documentation............................................................................................................................................. 8 1.5 Scope of Survey ........................................................................................................................................... 9 1.6 General Requirements .............................................................................................................................. 10 1.7 Inclining Test ............................................................................................................................................ 17 1.8 Stability Criteria ....................................................................................................................................... 19 1.9 Departures from and Interpretation of Rules ............................................................................................ 20 1.10 Passage beyond Specified Navigation Area ............................................................................................. 20 1.11 Required Bow Height ............................................................................................................................... 21 1.12 Ballast water exchange ............................................................................................................................. 21 1.13 Freeboard .................................................................................................................................................. 21 2 Basic Requirements and Criteria................................................................................................................... 22 2.1 Unrestricted Service Ships ........................................................................................................................ 22 2.2 Restricted Service Ships ........................................................................................................................... 25 3 Stability – Detailed Requirements for particular Types of ships ................................................................ 28 3.1 Passenger Ships ........................................................................................................................................ 28 3.2 Dry Cargo Ships ....................................................................................................................................... 29 3.3 Container Ships......................................................................................................................................... 30 3.4 Tankers ..................................................................................................................................................... 31 3.5 Timber Carriers......................................................................................................................................... 32 3.6 Special Purpose Ships ............................................................................................................................... 34 3.7 Fishing Vessels ......................................................................................................................................... 34 3.8 Tugs .......................................................................................................................................................... 35 3.9 Supply Vessels .......................................................................................................................................... 38 3.10 Ships Intended for Carriage of Dangerous Bulk Cargoes ......................................................................... 39 3.11 High-speed craft ....................................................................................................................................... 39 3.12 Chemical Tankers ..................................................................................................................................... 39 3.13 Gas Tankers .............................................................................................................................................. 40 3.14 Ships intended to operate in polar waters ................................................................................................. 40 4 Stability – requirements for Technical Floating Units ................................................................................... 41 4.1 Floating Cranes ......................................................................................................................................... 41 4.2 Dredging Fleet .......................................................................................................................................... 49 4.3 Pontoons ................................................................................................................................................... 53 5 Subdivision ....................................................................................................................................................... 55 5.1 Application ............................................................................................................................................... 55 5.2 General Requirements .............................................................................................................................. 55 5.3 Basic Requirements for Various Ship Types ............................................................................................ 57 5.4 Regional Requirements for Damage Stability of Ro-ro Passenger Ships ................................................. 62 5.5 Ships intended to operate in polar waters ................................................................................................. 62 Supplement – Retroactive Requirements ........................................................................................................... 63 Annex 1 .................................................................................................................................................................. 64 Annex 2 .................................................................................................................................................................. 66 Annex 3 .................................................................................................................................................................. 68 Annex 4 .................................................................................................................................................................. 69 Annex 5 .................................................................................................................................................................. 71 Annex 6 .................................................................................................................................................................. 74 Annex 7 .................................................................................................................................................................