RULES FOR THE CLASSIFICATION AND CONSTRUCTION OF SEA-GOING SHIPS PART III HULL EQUIPMENT July 2021 GDAŃSK RULES FOR THE CLASSIFICATION AND CONSTRUCTION OF SEA-GOING SHIPS prepared and issued by Polski Rejestr Statków S.A., 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 III – Hull Equipment – July 2021, was approved by the PRS Board on 24 May 2021 and enters into force on 1 July 2021. From the entry into force, the requirements of Part III – Hull Equipment apply, within the full scope, to new ships. With respect to existing ships, the requirements of Part III – Hull Equipment are applicable within the scope specified in Part I – Classification Regulations. The requirements of Part III – Hull Equipment are extended by the below-listed Publications: Publication 21/P – Testing of the Hull Structures, Publication 32/P – Requirements Concerning Stowage and Lashing of Cargoes on Sea-going Ships, Publication 76/P – Stability, Subdivision and Freeboard of Passenger Ships Engaged on Domestic Voyages, Publication 122/P – Requirements for Baltic Ice Class and Polar Class for Ships Under PRS Supervision, Publication 25/I – Explanatory Notes to the Standards for Ship Manoeuvrability, Publication 27/I – Guidelines for Approval/Acceptance of Alternative Means of Access. © Copyright by Polski Rejestr Statków S.A., 2021 PRS/RP, 05/2021 CONTENTS 1 General ............................................................................................................................................................. 7 1.1 Application ............................................................................................................................................... 7 1.2 Definitions and Explanations .................................................................................................................... 7 1.3 Survey and Classification ......................................................................................................................... 11 1.4 Technical Documentation ......................................................................................................................... 12 1.5 Materials ................................................................................................................................................... 14 1.6 Working and Permissible Stresses ............................................................................................................ 14 1.7 Equipment Number ................................................................................................................................... 15 1.8 Ergonomic Considerations ........................................................................................................................ 16 2 Steering Gear ................................................................................................................................................... 18 2.1 General ..................................................................................................................................................... 18 2.2 Steering Gear Loads ................................................................................................................................. 19 2.3 Loads Acting on Steering Nozzles............................................................................................................ 28 2.4 Rudder Design .......................................................................................................................................... 31 2.5 Construction of Steering Nozzle ............................................................................................................... 43 2.6 Power System ........................................................................................................................................... 48 2.7 Standards for Ship Manoeuvrability ......................................................................................................... 53 3 Anchoring Equipment .................................................................................................................................... 57 3.1 General ..................................................................................................................................................... 57 3.2 Anchors ..................................................................................................................................................... 59 3.3 Anchor Chains and Anchor Wire Ropes ................................................................................................... 61 3.4 Anchor Appliances ................................................................................................................................... 62 4 Mooring Equipment ........................................................................................................................................ 65 4.1 General ..................................................................................................................................................... 65 4.2 Mooring Equipment .................................................................................................................................. 66 5 Towing Arrangements .................................................................................................................................... 71 5.1 General ..................................................................................................................................................... 71 5.2 Towing Equipment ................................................................................................................................... 71 6 Signal Masts ..................................................................................................................................................... 77 6.1 General ..................................................................................................................................................... 77 6.2 Stayed Masts ............................................................................................................................................. 77 6.3 Unstayed Masts......................................................................................................................................... 77 6.4 Masts of Special Construction .................................................................................................................. 78 7 Closing Appliances of Openings in Hull and Superstructures .................................................................... 79 7.1 General ..................................................................................................................................................... 79 7.2 Side Scuttles and Windows ...................................................................................................................... 79 7.3 Doors ........................................................................................................................................................ 83 7.4 Bow Doors and Inner Doors ..................................................................................................................... 84 7.5 Side Shell Doors and Stern Doors ............................................................................................................ 92 7.6 Companion Hatches, Skylights and Ventilating Trunks ........................................................................... 95 7.7 Ventilators and Ventilating Ducts ............................................................................................................. 99 7.8 Manholes .................................................................................................................................................. 100 7.9 Closing Appliances of Openings in Subdivision Bulkheads .................................................................... 100 7.10 Cargo Hatches........................................................................................................................................... 101 7.11 Machinery and Boiler Room Casings ....................................................................................................... 130 7.12 Protection of Openings in Raised Quarterdecks ....................................................................................... 130 8 Equipment of Ship Spaces .............................................................................................................................. 132 8.1 General ...................................................................................................................................................... 132 8.2 Equipment of Cargo Holds ....................................................................................................................... 132 9 Access Means and Appliances ........................................................................................................................ 134 9.1 Means of Escape ......................................................................................................................................