RULES FOR CLASSIFICATION OFD ET N ORSKE V ERITASVeritasveien 1, NO-1322 Høvik, Norway Tel.: +47 67 57 99 00 Fax: +47 67 57 99 11SHIPSNEWBUILDINGSMACHINERY AND SYSTEMSMAIN CLASS PART 4 CHAPTER 10FIRE SAFETYJULY 2004CONTENTS PAGESec.1General Requirements (5)Sec.2Fire Safety Measures for Cargo Ships of Less Than 500 Gross Tonnage (9)Sec.3Fire Safety Measures for Cargo Ships of 500 Gross Tonnage and Above (11)Sec.4Fire Safety Measures for Issue of SOLAS Safety Certificates (13)App.A Interpretations and Clarifications to SOLAS Ch. II-2 (15)App.B Fixed Gas Fire-extinguishing Systems (22)App.C High Expansion and Inside Air Foam Systems (25)INTRODUCTIONComments to the rules may be sent by e-mail to rules@For subscription orders or information about subscription terms, please use distribution@Comprehensive information about DNV and the Society's services is found at the Web site © Det Norske VeritasComputer Typesetting (FM+SGML) by Det Norske Veritas Printed in NorwayIf any person suffers loss or damage which is proved to have been caused by any negligent act or omission of Det Norske Veritas, then Det Norske Veritas shall pay compensation to such person for his proved direct loss or damage. However, the compensation shall not exceed an amount equal to ten times the fee charged for the service in question, provided that the maximum compen-sation shall never exceed USD 2 million.In this provision "Det Norske Veritas" shall mean the Foundation Det Norske Veritas as well as all its subsidiaries, directors, officers, employees, agents and any other acting on behalf of Det Norske Veritas.GeneralThe Executive Board approved this new chapter in June 2004. These rules come into force on 1 January 2005.This chapter is valid until superseded by a revised chapter. Supple-ments will not be issued except for an updated list of minor amend-ments and corrections presented in Pt.0 Ch.1 Sec.3. Pt.0 Ch.1 is normally revised in January and July each year.Revised chapters will be forwarded to all subscribers to the rules.Buyers of reprints are advised to check the updated list of rule chap-ters printed Pt.0 Ch.1 Sec.1 to ensure that the chapter is current.IntroductionThis new chapter is moved from Pt.3 Ch.3 Sec.10.In addition, DNV guidelines/interpretations on fire safety issues, e.g.for extinguishing systems, have been reintroduced in the rules.DNV guidelines/interpretations to SOLAS Ch.II-2, plus all relevant IACS interpretations to Ch.II-2 have been reinserted in the rules as ap-pendices, being an implicit part of DNV's scope when so authorised by the flag administration to issue SOLAS Safety Certificates.DNV's interpretations of SOLAS on high expansion foam extinguish-ing systems have also been updated and aligned with accepted indus-try standards as of today.Main class fire safety rules for cargo vessels < 500 gross tonnage have been updated to be in line with IACS Internal Guideline No.2 for small vessels.Rules for Ships, July 2004Pt.4 Ch.10 Contents – Page 3D ET N ORSKE V ERITASCONTENTSSEC. 1GENERAL REQUIREMENTS.......................... 5A.Application.. (5)A 100Application (5)B.Scope of Work (5)B 100Classification.....................................................................5B 200SOLAS safety certificates. (5)C.Submission of Documentation (5)C 100General (5)D.Definitions (5)D 100Definitions (5)SEC. 2FIRE SAFETY MEASURES FOR CARGOSHIPS OF LESS THAN500 GROSS TONNAGE....................................... 9A.General.. (9)A 100Application........................................................................9A 200Submission of documentation. (9)B.Suppression of Fire (9)B 100Fire pumps ........................................................................9B 200Fire mains and hydrants....................................................9B 300Fire extinguishers..............................................................9B 400Fixed fire-extinguishing systems....................................10B 500Cargo tank protection......................................................10B 600Fire-fighter’s outfits........................................................10B700Structural fire protection.................................................10C.Escape.. (10)C 100Means of escape (10)SEC. 3FIRE SAFETY MEASURES FOR CARGOSHIPS OF 500 GROSS TONNAGEAND ABOVE....................................................... 11A.General (11)A 100Application......................................................................11A 200Submission of documentation (11)B.Means of Escape (11)B 100General............................................................................11B 200Means of escape from accommodation spaces, service spaces and control stations..............................................11B 300Means of escape from machinery spaces........................11B 400Means of escape from ro-ro spaces.................................12C.Fire Control Plans (12)C 100Fire control plans (12)SEC. 4FIRE SAFETY MEASURES FOR ISSUEOF SOLAS SAFETY CERTIFICATES........... 13A.General (13)A 100Application......................................................................13A 200Purpose............................................................................13A 300Scope...............................................................................13A 400Submission of documentation (13)APP. A INTERPRETATIONS AND CLARIFICATIONS TO SOLAS CH. II-2.......................................................... 15A.General (15)A 100Application (15)B.SOLAS Reg.II-2/4 Probability of Ignition (15)B 100Miscellaneous items of ignition sourcesand ignitability (15)C.SOLAS Reg.II-2/5 Fire Growth Potential (15)C 100Control of air supply and flammable liquidto the space......................................................................15C 200Fire protection materials (15)D.SOLAS Reg.II-2/6 Smoke Generation Potential andToxicity (17)D 100Paints, varnishes and other finishes, primary deckcoverings (17)E.SOLAS Reg.II-2/7 Detection and Alarm (17)E 100General requirements......................................................17E 200Protection of machinery spaces......................................17E 300Protection of accommodation and service spaces and control stations................................................................17E 400Requirements of the FSS Code Ch. 9 Fixed firedetection and fire alarm systems.....................................18F.SOLAS Reg.II-2/8 Control of Smoke Spread (18)F 100Protection of control stations outsidemachinery spaces (18)G.SOLAS Reg.II-2/9 Containment of Fire (18)G 100Thermal and structural boundaries..................................18G 200Protection of openings in fire-resisting divisions ..........18G 300Protection of openings in machinery spaceboundaries.......................................................................18G 400Ventilation systems (18)H.SOLAS Reg.II-2/10 Fire Fighting (19)H 100Water supply systems.....................................................19H 200Portable fire extinguishers..............................................19H 300Fixed fire-extinguishing systems....................................19H 400Fire-extinguishing arrangements in machinery spaces...20H 500Fire-extinguishing arrangements in cargo spaces...........20H 600Fire-fighter’s outfits (20)I.SOLAS Reg.II-2/11 Structural Integrity..........................20J.SOLAS Reg.II-2/12 Notification of Crewand Passengers....................................................................20K.SOLAS Reg.II-2/13 Means of Escape. (20)K 100Means of escape from control stations,accommodation spaces and service spaces.....................20K 200Means of escape from machinery spaces (20)L.SOLAS Reg.II-2/14 Operational Readiness andMaintenance........................................................................20M.SOLAS Reg.II-2/15 Instructions, Onboard Trainingand Drills.............................................................................21N.SOLAS Reg.II-2/16 Operations........................................21O.SOLAS Reg.II-2/17 Alternative Designand Arrangements..............................................................21P.SOLAS Reg.II-2/18 Helicopter Facilities. (21)P 100Helicopter refuelling and hangar facilities (21)Q.SOLAS Reg.II-2/19 Carriage of Dangerous Goods (21)Q 100General (21)R.SOLAS Reg.II-2/20 Protection of Vehicle, SpecialCategory and Ro-Ro Spaces (21)R 100Precaution against ignition of flammable vapours in closed vehicle spaces, closed ro-ro spaces andspecial category spaces (21)APP. B FIXED GAS FIRE-EXTINGUISHINGSYSTEMS 22A.General (22)A 100Application (22)B.Requirements for all Gas Fire-extinguishing Systems (22)B 100General requirements .....................................................22C.CO 2 Fire-extinguishing Systems (22)C 100General requirements (22)Rules for Ships, July 2004Pt.4 Ch.10 Contents – Page 4D ET N ORSKE V ERITASC 200Fire-extinguishing systems for cargo holds....................22C 300CO 2 high pressure fire-extinguishing systems formachinery spaces............................................................22D.Low Pressure CO 2 Systems . (23)D 100General............................................................................23D 200Testing (24)APP. C HIGH EXPANSION AND INSIDE AIRFOAM SYSTEMS (25)A.General (25)A 100Application .....................................................................25A 200Water and foam concentrate supply systems..................25A 300Foam generating components and foamgenerator room................................................................25A 400System arrangement........................................................25A 500Arrangement for machinery spaces andcargo pump rooms...........................................................26A 600Arrangement for ro-ro spaces (26)Rules for Ships, July 2004Pt.4 Ch.10 Sec.1 – Page 5D ET N ORSKE V ERITASSECTION 1GENERAL REQUIREMENTSA. ApplicationA 100Application101 Unless explicitly stated, the requirements of this chapter do not apply to: —ships of war and troopships—ships not propelled by mechanical means —wooden ships of primitive build —pleasure yachts not engaged in trade —fishing vessels.B. Scope of WorkB 100Classification101 The requirements in Sec.2 apply to cargo ships of less than 500 gross tonnage assigned main class.102 The requirements in Sec.3 apply to cargo ships of 500gross tonnage and above assigned main class.103 Supplementary requirements will be enforced for ships with additional class notations as required by the respective parts of the rules.Guidance note:Other requirements in Pt.1, Pt.2, Pt.3 and Pt.4 may apply in addi-tion to these rules.---e-n-d---of---G-u-i-d-a-n-c-e---n-o-t-e---B 200SOLAS safety certificates201 It is the responsibility of the government of the flag state to ensure that ships are provided with the fire safety measures required by the International Convention for the Safety of Life at Sea, 1974, as amended (hereafter referred as SOLAS) when such requirements apply.202 Where the government of the flag state has authorised the Society to issue the SOLAS safety certificates on its behalf,the Society will give effect to the fire protection, detection and extinction requirements of Ch.II-2 of SOLAS.203 The requirements in Sec.4 apply as the basis for stating compliance with Ch.II-2 of SOLAS and as part of the basis for the issue of SOLAS safety certificates. Compliance with re-quirements in Sec.4 will automatically result in compliance with requirements in Sec.3 for assignment of main class.C. Submission of DocumentationC 100General101 Verification of design is based on an assessment of plans and documentation containing relevant information elements.102 Plans and documentation shall be submitted for assess-ment as required by Sec.2, Sec.3 and Sec.4 respectively de-pending on the Society’s scope of work.D. DefinitionsD 100Definitions101 Accommodation spaces are those spaces used for public spaces, corridors, lavatories, cabins, offices, hospitals, cine-mas, game and hobby rooms, barber shops, pantries containing no cooking appliances and similar spaces.(SOLAS Ch. II-2/3.1).102 “A” class divisions are those divisions formed by bulk-heads and decks which comply with the following criteria:—they are constructed of steel or other equivalent material —they are suitably stiffened—they are insulated with approved non-combustible materi-als such that the average temperature of the unexposed side will not rise more than 140°C above the original tem-perature, nor will the temperature, at any one point, includ-ing any joint, rise more than 180°C above the original temperature, within the time listed below:—they are so constructed as to be capable of preventing thepassage of smoke and flame for the full duration of the one-hour standard fire test—the Society shall require a test of a prototype bulkhead ordeck in accordance with the Fire Test Procedures Code to ensure that it meets the above requirements for integrity and temperature rise.(SOLAS Ch. II-2/3.2)103 Atriums are public spaces within a single main vertical zone spanning three or more open decks.(SOLAS Ch. II-2/3.3)104 “B” class divisions are those divisions formed by bulk-heads, decks, deckheads or linings, which comply with the fol-lowing criteria:—they are constructed of approved non-combustible materi-als and all materials used in the construction and erection of "B" class divisions shall be non-combustible, with the exception that combustible veneers may be permitted pro-vided they meet other requirements of this chapter—they have an insulation value such that the average tem-perature of the unexposed side will not rise more than 140°C above the original temperature, nor will the temper-ature at any one point, including any joint, rise more than 225°C above the original temperature, within the time list-ed below:—they are so constructed as to be capable of preventing thepassage of flame to the end of the first half hour of the standard fire test—the Society shall require a test of a prototype division inaccordance with the Fire Test Procedures Code to ensure that it meets the above requirements for integrity and tem-perature rise.(SOLAS Ch. II-2/3.4)105 Bulkhead deck is the uppermost deck up to which the transverse watertight bulkheads are carried.(SOLAS Ch. II-2/3.5)–class "A-60"60 minutes –class "A-30"30 minutes –class "A-15"15 minutes –class "A-0"0 minutes–class "B-15"15 minutes –class "B-0" 0 minutesRules for Ships, July 2004Pt.4 Ch.10 Sec.1 – Page 6D ET N ORSKE V ERITAS106 Cargo area is that part of the ship that contains cargo holds, cargo tanks, slop tanks and cargo pump-rooms includ-ing pump-rooms, cofferdams, ballast and void spaces adjacent to cargo tanks and also deck areas throughout the entire length and breadth of the part of the ship over the above mentioned spaces.(SOLAS Ch. II-2/3.6)107 A cargo ship is any ship that is not a passenger ship.(SOLAS Ch. I/2(g))108 Cargo spaces are spaces used for cargo, cargo oil tanks,tanks for other liquid cargo and trunks to such spaces.(SOLAS Ch. II-2/3.8)109 Central control station is a control station in which the following control and indicator functions are centralised:—fixed fire detection and fire alarm system—automatic sprinklers, fire detection and fire alarm system —fire door indicator panels —fire door closure—watertight door indicator panels —watertight door closure —ventilation fans —general/fire alarms—communication systems including telephones —microphones to public address systems.(SOLAS Ch. II-2/3.9)110 “C” class divisions are divisions constructed of ap-proved non-combustible materials. They need meet neither re-quirements relative to the passage of smoke and flame nor limitations relative to the temperature rise. Combustible ve-neers are permitted provided they meet other requirements of this chapter.(SOLAS Ch. II-2/3.10)111 A division consisting of a non-combustible core and combustible veneers may be accepted as a B or C class divi-sion, provided that the non-combustible core is tested in ac-cordance with the Fire Test Procedures Code, part 1, that the B class division is tested in accordance with the Fire Test Proce-dures Code, part 3, and that the veneers mounted to the non-combustible core are tested in accordance with the Fire Test Procedures Code, part 5 and part 2 if applicable. (IACS UI SC125)112 Chemical tanker is a cargo ship constructed or adapted and used for the carriage in bulk of any liquid product of a flammable nature listed in chapter 17 of the International Bulk Chemical Code, as defined in regulation VII/8.1.(SOLAS Ch. II-2/3.11)113 Closed ro-ro spaces are ro-ro spaces which are neither open ro-ro spaces nor weather decks.(SOLAS Ch. II-2/3.12)114 Closed vehicle spaces are vehicle spaces which are nei-ther open vehicle spaces nor weather decks.(SOLAS Ch. II-2/3.13)115 Combination carrier is a cargo ship designed to carry both oil and solid cargoes in bulk.(SOLAS Ch. II-2/3.14)116 Combustible material is any material other than a non-combustible material.(SOLAS Ch. II-2/3.15)117 Continuous “B” class ceilings or linings are those "B"class ceilings or linings which terminate at an "A" or "B" class division.(SOLAS Ch. II-2/3.16)118 Continuously manned central control station is a central control station which is continuously manned by a responsible member of the crew.(SOLAS Ch. II-2/3.16)119 Control stations are those spaces in which the ship's ra-dio or main navigating equipment or the emergency source of power is located or where the fire recording or fire control equipment is centralized. Spaces where the fire recording or fire control equipment is centralized are also considered to be a fire control station .(SOLAS Ch. II-2/3.18)Control stations are spaces containing emergency sources for emergency lighting, wheel house and chartroom, spaces con-taining the ship's radio equipment, fire-extinguishing rooms.Spaces containing the following battery sources shall be re-garded as control stations regardless of battery capacity:—emergency batteries in separate battery room for powersupply from blackout till start of emergency generator —emergency batteries in separate battery room as reservesource of energy to radiotelegraph installation —batteries for start of emergency generator—and in general, all emergency batteries required in pursu-ance of Ch.8 Sec.2 C.(IACS UI SC17)120 Crude oil is any oil occurring naturally in the earth whether or not treated to render it suitable for transportation and includes crude oil where certain distillate fractions may have been removed from or added to.(SOLAS Ch. II-2/3.19)121 Dangerous goods are those goods referred to in regula-tion VII/2.(SOLAS Ch. II-2/3.20)122 Deadweight is the difference in tonnes between the dis-placement of a ship in water of a specific gravity of 1.025 at the load waterline corresponding to the assigned summer free-board and the lightweight of the ship. (SOLAS Ch. II-2/3.21)123 Fire Safety Systems Code means the International Code for Fire Safety Systems as adopted by the Maritime Safety Committee of the Organization by resolution MSC.98(73), as may be amended by the Organization, provided that such amendments are adopted, brought into force and take effect in accordance with the provisions of article VIII of the present Convention concerning the amendment procedures applicable to the annex other than chapter I thereof.(SOLAS Ch. II-2/3.22)124 Fire Test Procedures Code means the International Code for Application of Fire Test Procedures as adopted by the Maritime Safety Committee of the Organization by resolution MSC.61(67), as may be amended by the Organization, provid-ed that such amendments are adopted, brought into force and take effect in accordance with the provisions of article VIII of the present Convention concerning the amendment procedures applicable to the annex other than chapter I thereof.(SOLAS Ch. II-2/3.23)125 Flashpoint is the temperature in degrees Celsius (closed cup test) at which a product will give off enough flammable vapour to be ignited, as determined by an approved flashpoint apparatus.(SOLAS Ch. II-2/3.24)Rules for Ships, July 2004Pt.4 Ch.10 Sec.1 – Page 7D ET N ORSKE V ERITAS126 Gas carrier is a cargo ship constructed or adapted and used for the carriage in bulk of any liquefied gas or other prod-ucts of a flammable nature listed in chapter 19 of the Interna-tional Gas Carrier Code, as defined in regulation VII/11.1.(SOLAS Ch. II-2/3.25)127 Helideck is a purpose-built helicopter landing area locat-ed on a ship including all structure, fire-fighting appliances and other equipment necessary for the safe operation of heli-copters.(SOLAS Ch. II-2/3.26)128 Helicopter facility is a helideck including any refuelling and hangar facilities.(SOLAS Ch. II-2/3.27)129 Lightweight is the displacement of a ship in tonnes with-out cargo, fuel, lubricating oil, ballast water, fresh water and feedwater in tanks, consumable stores, and passengers and crew and their effects.(SOLAS Ch. II-2/3.28)130 Low flame-spread means that the surface thus described will adequately restrict the spread of flame, this being deter-mined in accordance with the Fire Test Procedures Code.(SOLAS Ch. II-2/3.29)131 Machinery spaces are machinery spaces of category A and other spaces containing propulsion machinery, boilers, oil fuel units, steam and internal combustion engines, generators and major electrical machinery, oil filling stations, refrigerat-ing, stabilizing, ventilation and air conditioning machinery,and similar spaces, and trunks to such spaces.(SOLAS Ch. II-2/3.30)132 Machinery spaces of category A are those spaces and trunks to such spaces which contain either:—internal combustion machinery used for main propulsion —internal combustion machinery used for purposes otherthan main propulsion where such machinery has in the ag-gregate a total power output of not less than 375 kW—any oil-fired boiler or oil fuel unit, or any oil-fired equip-ment other than boilers, such as inert gas generators, incin-erators.(SOLAS Ch. II-2/3.31)133 Main vertical zones are those sections into which the hull, superstructure and deckhouses are divided by "A" class divisions, the mean length and width of which on any deck does not in general exceed 40 m.(SOLAS Ch. II-2/3.32)134 Non-combustible material is a material which neither burns nor gives off flammable vapours in sufficient quantity for self-ignition when heated to approximately 750°C, this be-ing determined in accordance with the Fire Test Procedures Code.(SOLAS Ch. II-2/3.33)135 Oil fuel unit is the equipment used for the preparation of oil fuel for delivery to an oil-fired boiler, or equipment used for the preparation for delivery of heated oil to an internal combus-tion engine, and includes any oil pressure pumps, filters and heaters dealing with oil at a pressure of more than 0.18 N/mm 2.(SOLAS Ch. II-2/3.34)Oil fuel unit includes any equipment used for the preparation and delivery of oil fuel, heated or not, to boilers (including in-ert gas generators) and engines (including gas turbines) at a pressure of more than 0.18 N/mm 2.(IACS UI SC16)136 Open ro-ro spaces are those ro-ro spaces that are either open at both ends or have an opening at one end, and are pro-vided with adequate natural ventilation effective over their en-tire length through permanent openings distributed in the side plating or deckhead or from above, having a total area of at least 10% of the total area of the space sides.(SOLAS Ch. II-2/3.35)137 Open vehicle spaces are those vehicle spaces either open at both ends, or have an opening at one end and are provided with adequate natural ventilation effective over their entire length through permanent openings distributed in the side plat-ing or deckhead or from above, having a total area of at least 10% of the total area of the space sides.(SOLAS Ch. II-2/3.36)138 A passenger ship is a ship which carries more than twelve passengers.(SOLAS Ch. I/2(f))139 Prescriptive requirements means the construction char-acteristics, limiting dimensions, or fire safety systems speci-fied in the rules.(SOLAS Ch. II-2/3.38)140 Public spaces are those portions of the accommodation which are used for halls, dining rooms, lounges and similar permanently enclosed spaces.(SOLAS Ch. II-2/3.39)141 Rooms containing furniture and furnishings of restricted fire risk , are those rooms containing furniture and furnishings of restricted fire risk (whether cabins, public spaces, offices or other types of accommodation) in which:—case furniture such as desks, wardrobes, dressing tables,bureaux, dressers, are constructed entirely of approved non-combustible materials, except that a combustible ve-neer not exceeding 2 mm may be used on the working sur-face of such articles—free-standing furniture such as chairs, sofas, tables, areconstructed with frames of non-combustible materials —draperies, curtains and other suspended textile materialshave qualities of resistance to the propagation of flame not inferior to those of wool having a mass of mass 0.8 kg/m2,this being determined in accordance with the Fire Test Procedures Code—floor coverings have low flame-spread characteristics;—exposed surfaces of bulkheads, linings and ceilings havelow flame-spread characteristics—upholstered furniture has qualities of resistance to the ig-nition and propagation of flame, this being determined in accordance with the Fire Test Procedures Code—bedding components have qualities of resistance to the ig-nition and propagation of flame, this being determined in accordance with the Fire Test Procedures Code.(SOLAS Ch. II-2/3.40)142 Ro-ro spaces are spaces not normally subdivided in any way and normally extending to either a substantial length or the entire length of the ship in which motor vehicles with fuel in their tanks for their own propulsion and/or goods (packaged or in bulk, in or on rail or road cars, vehicles (including road or rail tankers), trailers, containers, pallets, demountable tanks or in or on similar stowage units or other receptacles) can be load-ed and unloaded normally in a horizontal direction.(SOLAS Ch. II-2/3.41)143 Ro-ro passenger ship means a passenger ship with ro-ro spaces or special category spaces.(SOLAS Ch. II-2/3.42)Rules for Ships, July 2004Pt.4 Ch.10 Sec.1 – Page 8D ET N ORSKE V ERITAS144 Steel or other equivalent material means any non-com-bustible material which, by itself or due to insulation provided,has structural and integrity properties equivalent to steel at the end of the applicable exposure to the standard fire test (e.g. alu-minium alloy with appropriate insulation).(SOLAS Ch. II-2/3.43)145 Sauna is a hot room with temperatures normally varying between 80º-120ºC where the heat is provided by a hot surface (e.g. by an electrically-heated oven). The hot room may also include the space where the oven is located and adjacent bath-rooms.(SOLAS Ch. II-2/3.44)146 Service spaces are those spaces used for galleys, pantries containing cooking appliances, lockers, mail and specie rooms, storerooms, workshops other than those forming part of the machinery spaces, and similar spaces and trunks to such spaces.(SOLAS Ch. II-2/3.45)147 Special category spaces are those enclosed vehicle spac-es above and below the bulkhead deck, into and from which vehicles can be driven and to which passengers have access.Special category spaces may be accommodated on more thanone deck provided that the total overall clear height for vehi-cles does not exceed 10 m.(SOLAS Ch. II-2/3.46)148 A standard fire test is a test in which specimens of the relevant bulkheads or decks are exposed in a test furnace to temperatures corresponding approximately to the standard time-temperature curve in accordance with the test method specified in the Fire Test Procedures Code.(SOLAS Ch. II-2/3.47)149 A tanker is a cargo ship constructed or adapted for the carriage in bulk of liquid cargoes of an inflammable nature.(SOLAS Ch. I/2(h))150 Vehicle spaces are cargo spaces intended for carriage of motor vehicles with fuel in their tanks for their own propul-sion.(SOLAS Ch. II-2/3.49)151 Weather deck is a deck which is completely exposed to the weather from above and from at least two sides.(SOLAS Ch. II-2/3.50)。
