Chapter 2 - Definitions
Clasification Society 2024 - Version 9.40
Statutory Documents - MCA Publications - Yacht Code - January 2019 Edition - Part A - Large Yacht Code (up to 12 passengers) - Chapter 2 - Definitions

Chapter 2 - Definitions

2.1 General Requirements

(1) For the purpose of this Code, unless expressly provided otherwise, the terms used therein have the meanings defined in this section- (Note: where a definition is not contained within this Code, guidance shall be taken from definitions within the applicable International Conventions).

(2) Except where the context otherwise requires, throughout the Code the terms “yacht”, “ship” and “vessel” are synonymous.

(3) The following definitions are applicable for this Part A of the Code:

“A” Class divisions” means those divisions formed by bulkheads and decks which comply with the following criteria:
  • 1. they are constructed of steel or other equivalent material;
  • 2. they are suitably stiffened;
  • 3. they are insulated with approved non-combustible materials such that the average temperature of the unexposed side will not rise more than 140°C above the original temperature, nor will the temperature, at any one point, including any joint, rise more than 180°C above the original temperature, within the time listed below:
    • class "A-60" 60 min

    • class "A-30" 30 min

    • class "A-15" 15 min

    • class "A-0" 0 min

  • 4. they are constructed as to be capable of preventing the passage of smoke and flame to the end of the one-hour standard fire test; and
  • 5. the Administration required a test of a prototype bulkhead or deck in accordance with the Fire Test Procedures Code to ensure that it meets the above requirements for integrity and temperature rise.
“Accommodation spaces” means those spaces used for public spaces, corridors, lavatories, cabins, offices, hospitals, cinemas, game and hobby rooms, barber shops, pantries containing no cooking appliances and similar spaces.
“Administration” with regard to this Code means the Government of the State whose flag the ship is entitled to fly, or a Recognised Organisation who has been delegated the responsibilities.
“Aft terminal” means the aft limit of the subdivision length
“Aft perpendicular” means the perpendicular taken at the after end of length (L)
“Amidship” means at the middle of the length (L)
“Approved” in respect to materials or equipment means approved by the Administration or approved by an Administration or organisation which is formally recognised by the Administration.
“Atrium” means a public space within a single main vertical zone spanning three or more open decks (as per existing Part B definition).
“Aviation Inspection Body” means a body delegated the responsibility of inspecting helicopter landing areas by the Administration. The verification process shall include inspection, certification and, where necessary, the application of appropriate operational limitations.
““B” class divisions” means those divisions, referred to as “B-15” or “B-0”, formed by bulkheads, decks, ceilings or linings which comply with the following criteria-
  • 1. they are constructed of approved non-combustible materials and all materials used in the construction and erection of "B" class divisions are non-combustible.
  • 2. they have an insulation value such that the average temperature of the unexposed side shall not rise more than 140°C above the original temperature, nor shall the temperature at any one point, including any joint, rise more than 225°C above the original temperature, within the time listed below-
    • class "B-15" 15 min
    • class "B-0" 0 min
  • 3. they are so constructed as to be capable of preventing the passage of flame to the end of the first half hour of the standard fire test; and
  • 4. the Administration has required a test of a prototype division in accordance with the Fire Test Procedures Code to ensure that it meets the above requirements for integrity and temperature rise
“Breadth” or “B”” means the maximum breadth of the ship, measured amidships to the moulded line of the frame in a ship with a metal shell and to the outer surface of the hull in a ship with a shell of any other material, unless expressly provided otherwise
“Bulkhead deck” means the uppermost deck up to which the transverse watertight bulkheads are carried
“Buoyant lifeline” means a line complying with the requirements of the LSA Code
“”C” class division” means divisions constructed of approved non-combustible materials. They need meet neither requirements relative to the passage of smoke and flame nor limitations relative to the temperature rise. Combustible veneers are permitted provided they meet the requirements of this chapter 14A or 14B.
“Cargo” means an item(s) of value that is carried from one place and discharged at another place and for which either a charge or no charge is made and is not for use exclusively onboard the vessel.
“Central control station” means a control station in which the following control and indicator functions are centralised-
  • (a) fixed fire detection and fire alarm systems;
  • (b) automatic sprinkler, fire detection and fire alarm systems;
  • (c) fire door indicator panels;
  • (d) fire door closure;
  • (e) watertight door indicator panels;
  • (f) watertight door closures;
  • (g) ventilation fans;
  • (h) general/fire alarms;
  • (i) communication systems including telephones; and
  • (j) microphones to public address systems
“Code” means Red Ensign Group Yacht Code
“Combustible material” means any material other than a non-combustible material
“Continuous "B" class ceilings or linings” means those "B" class ceilings or linings which terminate at an "A" or "B" class division.
“Continuously manned central control station” means a central control station which is continuously manned by a responsible member of the crew.
“COLREGs” means the Convention on the International Regulations for Preventing Collisions at Sea, 1972 (COLREG 72), as applicable for vessels the keels of which are laid on or after 1st January 2019.
“Control stations” means those spaces in which the ship's radio or main navigating equipment or the emergency source of power is located or where the fire recording or fire control equipment is centralised; spaces where the fire recording or fire control equipment is centralised are also considered to be a fire control station
“Company” means the Owner of the ship or any other Organisation or person such as the Manager, or the Bareboat Charterer, who has assumed the responsibility for operation of the ship from the Shipowner and who on assuming such responsibility has agreed to take over all the duties and responsibilities imposed by the Code.
“Deadlight” means a secondary watertight closure fitted to a glazed opening and which is fitted to the inside of the vessel
“Design Waterline” Deepest loaded draught as per the all-seasons Load Line assigned to the vessel
“Design pressure” means the hydrostatic pressure for which each structure or appliance assumed watertight in the intact and damage stability calculations is designed to withstand
“Draught” or (d) means the vertical distance from the keel line at mid-length to the waterline in question
“Efficient” in relation to a fitting, piece of equipment or material means that all reasonable and practicable measures have been taken to ensure that it is suitable for the purpose for which it is intended to be used.
“Embarkation ladder” means the ladder provided at survival craft embarkation stations to permit safe access to survival craft after launching; complying with the requirements of the LSA Code
"Embarkation station" means the place from which a survival craft is boarded. An embarkation station may also serve as a muster station, provided there is sufficient room, and the muster station activities can safely take place there.
“Emergency source of electrical power” means for Part A vessels less than 500GT a source of electrical power, intended to supply the emergency switchboard in the event of failure of the supply from the main source of electrical power. For all other vessels, it means the emergency source of electrical power required by SOLAS II-1/42.
“Emergency switchboard” is a switchboard which in the event of failure of the main electrical power supply system is directly supplied by the emergency source of electrical power or the transitional source of emergency power and is intended to distribute electrical energy to the emergency services.
“Engaged in trade” means, for the purposes of the Code, the carriage of passengers for reward or remuneration under a charter or hire agreement.
“EPIRB” means a satellite emergency position-indicating radio beacon, being an earth station in the mobile-satellite service, the emissions of which are intended to facilitate search and rescue operations, complying with performance standards adopted by the IMO contained in either Resolution A.810(19) or Resolution A.812(19) and Resolution A.662(16), or any Resolution amending or replacing these from time to time and which is considered by the Administration to be relevant, and is capable of:
  • (a) floating free and automatically activating if the ship sinks;
  • (b) being manually activated; and
  • (c) being carried by one person.
“Existing vessel” means any vessel, the keel of which was laid or was at a similar stage of construction prior to the 1st January 2019.
“Fire damper” means a device installed in a ventilation duct, which under normal conditions remains open allowing flow in the duct, and is closed during a fire, preventing the flow in the duct to restrict the passage of fire. In using the above definition, the following terms may be associated:
  • “automatic fire damper” is a fire damper that closes independently in response to exposure to fire products;
  • “manual fire damper” is a fire damper that is intended to be opened or closed by the crew by hand at the damper itself; and
  • “remotely operated fire damper” is a fire damper that is closed by the crew through a control located at a distance away from the controlled damper.
“Fire Safety Systems Code” means the International Code for Fire Safety Systems as adopted by the Maritime Safety Committee of the IMO by resolution MSC.98 (73), as may be amended by the IMO, 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 to the Convention other than Chapter I thereof
“Fire Test Procedures Code” means the International Code for Application of Fire Test Procedures as adopted by the Maritime Safety Committee of the IMO by resolution MSC.61(67), as may be amended by the IMO, 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 to the Convention other than Chapter I thereof
“flashpoint” means the temperature in degrees Celsius (closed cup test) at which a product shall give off enough flammable vapour to be ignited, as determined by an approved flashpoint apparatus
“Float-free launching” means that method of launching a survival craft whereby the craft is automatically released from a sinking ship and is ready for use
“Forward perpendicular” means the perpendicular taken at the forward end of the length (L) such that the perpendicular coincides with the fore side of the stem on the waterline on which the length is measured
“Freeboard” has the meaning given in annex I of ICLL. The freeboard assigned is the distance measured vertically downwards amidships from the upper edge of the deck line to the upper edge of the related load line.
“Freeboard deck” means, subject to paragraphs (a) to (d) below, the uppermost complete deck exposed to weather and sea, which has permanent means of closing all openings in the weather part thereof, and below which all openings in the sides of the ship are fitted with permanent means of watertight closing-
  • (a) in a ship having a discontinuous freeboard deck, the lowest line of the exposed deck and the continuation of that line parallel to the upper part of the deck is taken as the freeboard deck; and
  • (b) at the option of the Company and subject to the approval of the Administration, a lower deck may be designated as the freeboard deck provided it is a complete and permanent deck continuous in a fore and aft direction at least between the machinery space and peak bulkheads and continuous athwartships, provided that-
  • (c) when this lower deck is stepped the lowest line of the deck and the continuation of that line parallel to the upper part of the deck is taken as the freeboard deck;
  • (d) when a lower deck is designated as the freeboard deck, that part of the hull which extends above the freeboard deck is treated as a superstructure so far as concerns the application of the conditions of assignment and the calculation of freeboard and it is from this deck that the freeboard is calculated.
“Garage spaces” means those enclosed spaces above and below the bulkhead deck used for the storage of pleasure craft, vehicles, jet skis or any other such engine driven units and recreational dive systems
“Garbage” means all kinds of victual, domestic and operational waste excluding fresh fish and parts thereof, generated during the normal operation of the vessel and liable to be disposed of continuously or periodically, except sewage originating from vessels.
“General emergency alarm system” means the general emergency alarm system complying with the requirements of Chapter VII, 7.2.1 the LSA Code;
“Glazed Opening” means an opening in the hull, superstructure or deckhouse of a ship structure fitted with a transparent or translucent material.
“Hazardous area” means those areas which may contain flammable or explosive gases, dusts or vapours, the use without proper consideration of machinery or electrical equipment may lead to fire hazard or explosion.
“IMO High Speed Craft Code” means the International Code of Safety for High Speed Craft, 2000, adopted by the Maritime Safety Committee of the IMO by resolution MSC.97(73), as amended.
“ICLL” means the International Convention on Load Lines, 1966, as amended, as applicable for vessels the keels of which are laid on or after 1st January 2019.
“ILO” means the International Labour Organisation
“Immersion suit” means a protective suit which reduces the body heat loss of a person wearing it in cold water complying with the requirements of the LSA Code
“IMO” means the International Maritime Organisation, a specialised agency of the United Nations devoted to maritime affairs
“Inflatable lifejacket” means a lifejacket complying with the requirements of the LSA Code
“Intact Stability Code, 2008” means the International Code on Intact Stability, 2008 (2008 IS Code) As adopted by IMO Circular MSC.267(85). This revised Code includes a mandatory Part A and a recommendatory Part B. Also included in Part A are Severe Wind and Weather Rolling Criteria.
“Keel line” means a line parallel to the slope of the keel passing amidships through-
  • (a) the top of the keel at centreline or line of intersection of the inside of shell plating with the keel if a bar keel extends below that line, on a ship with a metal shell; or
  • (b) in wood and composite ships, the distance is measured from the lower edge of the keel rabbet and when the form at the lower part of the midship section is of a hollow character, or where thick garboards are fitted, the distance is measured from the point where the line of the flat of the bottom continued inward intersects the centreline amidships
“L1” a virtual line drawn at a height of 2.5% of the breadth (B), or 500 mm, whichever is the greatest distance, above the design waterline
“L2” a virtual line drawn at a height of hstd + 0.02L above the design waterline where 0.02L need not exceed 3m
“L3” a virtual line drawn at a height of 2 x hstd+0.02L above the design waterline where 0.02L need not exceed 3m
“Level 1” The area between ‘L1’ and ‘L2’
“Level 2” The area between ‘L2’ and ‘L3’
“Landing Area” A generic term referring to any area primarily intended for the landing or take-off of aircraft.
“Launching appliance (or arrangement)” means a provision complying with the requirements of the LSA Code for safely transferring a lifeboat, rescue boat, or liferaft respectively, from its stowed position to the water and recovery where applicable.
“Length” means 96% of the total length on a waterline of a ship at 85% of the least moulded depth measured from the top of the keel, or the length from the fore-side of the stem to the axis of the rudder stock on that waterline, if that be greater. In ships designed with a rake of keel the waterline on which this is measured shall be parallel to the designed waterline.
“Lightest seagoing condition” means the loading condition with the ship on even keel, with 10% stores and fuel remaining and with the full number of passengers and crew and their luggage
“Lifeboat” means a lifeboat complying with the requirements of the LSA Code
“Lifebuoy” means a lifebuoy complying with the requirements of LSA Code.
“Lifejacket” means a lifejacket complying with the requirements of LSA Code.
“Liferaft” means a liferaft complying with the requirements of LSA Code.
“Lightweight” means the displacement of a ship in tonnes without, fuel, lubricating oil, ballast water, fresh water and feedwater in tanks, consumable stores, and passengers and crew and their effects;
“Line throwing appliance” means an appliance complying with the requirements of LSA Code.
“Low-flashpoint fuel” means gaseous or liquid fuel having a flashpoint lower than otherwise permitted under SOLAS II-2/4.2.1.1
“Low flame spread” means that the surface thus described shall adequately restrict the spread of flame, this being determined in accordance with the Fire Test Procedures Code.
“LSA Code” means the International Life-Saving Appliance Code adopted by the Maritime Safety Committee of the IMO by resolution MSC.48(66), as it may be amended by the IMO
“Machinery rooms” means spaces between the watertight boundaries of a room containing the main and auxiliary propulsion machinery, including boilers, generators and electric motors primarily intended for propulsion; provided that in the case of unusual arrangements, the Administration may define the limits of the machinery rooms
“Machinery spaces” are all machinery spaces of category A and all other spaces containing propelling machinery, boilers, oil fuel units, steam and internal combustion engines, generators and major electrical machinery, oil filling stations, refrigerating, stabilizing, ventilation and air conditioning machinery, and similar spaces, and trunks to such spaces.
“Machinery spaces of category A” means those spaces and trunks to such spaces which contain either-
  • (a) internal combustion machinery used for main propulsion;
  • (b) internal combustion machinery used for purposes other than main propulsion where such machinery has in the aggregate a total power output of not less than 375 kW; or
  • (c) any oil-fired boiler or oil fuel unit, or any oil-fired equipment other than boilers, such as inert gas generators, incinerators, etc.
“Main source of electrical power” is a source intended to supply electrical power to the main switchboard for distribution to all services necessary for maintaining the ship in normal operation and habitable condition.
“Main switchboard” is a switchboard which is directly supplied by the main source of electrical power and is intended to distribute electrical energy to the ship's services.
“Main vertical zone” means those sections into which the hull, superstructure and deckhouses are divided by “A” class divisions, the mean length of which on any deck does not normally exceed 40 metres.
“Man-riding” means the use of a crane, lifting appliance or launching appliance with persons within the tender, rescue boat or other vehicle or platform during launch or recovery
“Margin line” is a line drawn at least 76 millimetres below the upper surface of the bulkhead deck at side
“Marine evacuation system” means an appliance complying with the requirements of the LSA Code, for the rapid transfer of persons from the embarkation deck of a ship to a floating survival craft;
“MARPOL” means the International Convention for the Prevention of Pollution from Ships, 1973, as amended.
“Master” includes every person (except a pilot) having command or charge of a ship and, in relation to a yacht, include the captain or skipper
“Mid-length” means the mid-point of the subdivision length of the ship;
“Major conversion” means a conversion of a vessel:
  • (a) that substantially alters the dimensions of a vessel;
  • (b) which changes the type of the vessel;
  • (c) the intent of which in the opinion of the Administration is substantially to prolong its life;
  • (d) which otherwise so alters the ship that, if it were a new vessel, it would become subject to relevant provisions of the present Code not applicable to it as an existing vessel.
“Mile” means a nautical mile of 1852 metres.
“MLC” means the International Labour Organisation’s Maritime Labour Convention 2006, as amended, as applicable for vessels the keels of which are laid on or after 1st January 2019.
“Moulded depth” means, subject to paragraphs (a) to (c) below, the vertical distance measured from the top of the keel to the top of the freeboard deck beam at side, provided that-
  • (a) in wood and composite ships, the distance is measured from the lower edge of the keel rabbet and where the form at the lower part of the midship section is of a hollow character, or where thick garboards are fitted, the distance is measured from the point where the line of the flat of the bottom continued inwards cuts the side of the keel;
  • (b) in ships having rounded gunwales, the moulded depth shall be measured to the point of intersection of the moulded lines of the deck and side shell plating, the lines extending as though the gunwale were of angular design; and
  • (c) where the freeboard deck is stepped and the raised part of the deck extends over the point at which the moulded depth shall be determined, the moulded depth shall be measured to a line of reference extending from the lower part of the deck along a line parallel with the raised part
"Muster station" means an area where passengers and crew can be gathered in the event of an emergency, given instructions and prepared to abandon the craft, if necessary.
“Non-combustible material” means a material which neither burns nor gives off flammable vapours in sufficient quantity for self-ignition when heated to approximately 750°C, this being determined in accordance with the Fire Test Procedures Code.
"Motor vessel” means a vessel which is described in the register and on the certificate of registry as such, and which has a sole means of propulsion either one or more power units.
“Multihull vessel” means any vessel which in any normally achievable operating trim or heel angle, has a rigid hull structure which penetrates the surface of the sea over more than one separate or discrete area.
“New vessel” means a vessel, to which this Code applies, the keel of which was laid or was at a similar stage of construction on or after the 1st January 2019.
“Not readily ignitable” means that the surface thus described shall not continue to burn for more than 20 seconds after removal of a suitable impinging test flame.
“Occasional Worker” As defined in Annex E
“Officer” “Officer” means
“Oil fuel unit” means 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 combustion engine, and includes any oil pressure pumps, filters and heaters dealing with oil at a pressure of more than 0.18 N/mm2
“Over-side Working Systems” means the securing, anchoring or track and rail systems used to access external portions of the vessel for maintenance and wash down. This can include but not limited to track and car systems or static harness points
“Partial subdivision draft” or “(dp)” means the light service draft plus 60% of the difference between the light service draft and the Design Waterline draft
“Passenger” As defined in Annex E
“Passenger ship” means a ship carrying more than 12 passengers
“Permeability or “(μ)”” of a space means the proportion of the immersed volume of that space which can be occupied by water
“Person” means a person over the age of one year.
“Pleasure vessel” shall have the meaning assigned to the term as defined in the national legislation of the REG Member State implementing the provisions of the Code
“Position 1” means upon freeboard decks and raised quarterdecks, or other exposed decksfootnote lower than one standard height of superstructure above the freeboard deck, and upon exposed decks3 situated forward of a point located a quarter of the ship’s length from the forward perpendicular that are located lower than two standard heights of superstructure above the freeboard deck.
“Position 2” means upon exposed decks situated abaft a quarter of the ship’s length from the forward perpendicular and located at least one standard height of superstructure above the freeboard deck and lower than two standard heights of superstructure above the freeboard deck. Upon exposed decks situated forward of a point located a quarter of the ship’s length from the forward perpendicular and located at least two standard heights of superstructure above the freeboard deck and lower than three standard heights of superstructure above the freeboard deck.
“Positive stability” means the ability of a ship to return to its original position after the removal of a heeling moment
“Prescribed international voyage” means an international voyage during the course of which a ship is not more than 200 nautical miles from a port or place in which the passengers and crew could be placed in safety and within a geographical area which limits the length of the voyage to a maximum of 1000 nautical miles from the initial point of departure, as specified in any Certificate issued in accordance with the Code with respect to the ship
“Prescriptive requirements” means the construction characteristics, limiting dimensions or fire safety systems specified in this Code or in applicable International Conventions or national laws and regulations
“Public spaces” means those portions of the accommodation which are used for halls, dining rooms, lounges and includes similar permanently enclosed spaces
“Radar transponder” means a radar transponder for use in survival craft to facilitate location of survival craft in search and rescue operations.
“Recess” means an indentation or depression in a deck and which is surrounded by the deck and has no boundary common with the shell of the vessel.
“Recognised Organisation or “RO”” means a Classification Society or other body which has been authorised by the Administration under a written agreement to undertake statutory surveys and issue statutory Certificates on the Administration’s behalf
“Recovery time for a rescue boat” means the time required to raise the boat to a position where persons onboard can disembark to the deck of the ship and includes the time required to make preparations for recovery onboard the rescue boat such as passing and securing a painter, connecting the rescue boat to the launching appliance, and the time to raise the rescue boat provided that recovery time does not include the time needed to lower the launching appliance into position to recover the rescue boat.
“Recreational Diving System” means any system storing compressed gas of any type to aid or facilitate recreational underwater activities.
“Recreational Fire Appliances” means heating or cooking appliances with open flames such as fireplaces, charcoal galley ovens, barbecues, spit roasts and fire pits.
“REG” Means The Red Ensign Group comprising of the United Kingdom, Crown Dependencies (Isle of Man, Guernsey and Jersey) and UK Overseas Territories (Anguilla, Bermuda, British Virgin Islands, Cayman Islands, Falkland Islands, Gibraltar, Montserrat, St Helena and the Turks & Caicos Islands) which operate shipping registers.
“Rescue boat” means a boat complying with the requirements of LSA Code and designed to rescue persons in distress and for marshalling liferafts.
“Retro-reflective material” means a material which reflects in the opposite direction a beam of light directed on it.
“Rocket parachute flare” means a pyrotechnic signal complying with the requirements of LSA Code.
“Safe haven” means a harbour or shelter of any kind which affords entry, subject to prudence in the weather conditions prevailing, and protection from the force of the weather.
“Sailing vessel” means a vessel designed to carry sail, whether as a sole means of propulsion or as a supplementary means.
“Sail Training Vessel” shall have the meaning assigned to the term as defined in the national legislation of the REG Member State implementing the provisions of the Code
“Sauna” means a hot room with temperatures normally varying between 80°C and 120°C where the heat is provided by a hot surface (e.g., by an electrically heated oven) and may include the space where the oven is located and adjacent bathrooms.
“Seafarer” includes every person (except Occasional Workers and pilots) employed or engaged in any capacity onboard a ship.
“Sea area A1” means an area within the radiotelephone coverage of at least one VHF coast station in which continuous DSC alerting is available.
“Sea area A2” means an area, excluding sea area A1, within the radiotelephone coverage of at least one MF coast station in which continuous DCS alerting is available
“Sea area A3” means an area, excluding sea areas A1 and A2, within the coverage of an INMARSAT geostationary satellite in which continuous alerting is available.
"Sea area A4” means an area outside sea area A1, A2 and A3.
“Self-activating smoke signal” means a signal complying with the requirements of LSA Code.
“Self-igniting light” means a light complying with the requirements of LSA Code.
“Service spaces” means those spaces used for galleys, pantries containing cooking appliances, lockers, store-rooms, workshops other than those forming part of the machinery spaces, and similar spaces and trunks to such spaces.
“Ships constructed” means ships the keels of which are laid or which are at a similar stage of construction.
“Short Range Yacht” means a vessel under 500GT, the keel of which was laid or was at a similar stage of construction prior to the 1st August 2005, or a vessel constructed on or after that date under 300GT: restricted to operating in forecast or actual wind of a maximum Beaufort Force 4, for a motor yacht, and Beaufort Force 6 for a sailing yacht within 60 nautical miles of a safe haven. (The Administration may permit operation on specified routes up to 90 nautical miles from a safe haven as appropriate).
“Similar stage of construction” means at a stage which:
  • (a) construction identifiable with a specific vessel begins; and
  • (b) assembly of that vessel, comprising at least 50 tonnes or 1% of the estimated mass of all structural material has commenced; or
  • (c) In the case of vessels constructed of FRP or GRP this shall be considered as the date when more than 5% of the hull resin and reinforcement has been laid.
“Smoke damper” means a device installed in a ventilation duct, which under normal conditions remains open allowing flow in the duct, and is closed during a fire, preventing the flow in the duct to restrict the passage of smoke and hot gases. A smoke damper is not expected to contribute to the integrity of a fire rated division penetrated by a ventilation duct. In using the above definition the following terms may be associated:
  • “automatic smoke damper” is a smoke damper that closes independently in response to exposure to smoke or hot gases;
  • “manual smoke damper” is a smoke damper intended to be opened or closed by the crew by hand at the damper itself; and
  • “remotely operated smoke damper” is a smoke damper that is closed by the crew through a control located at a distance away from the controlled damper.
“Sprinkler” means a fixed pressure water-spraying fire-extinguishing system complying with the provisions of the Fire Safety Systems Code.
“SOLAS” means the International Convention for the Safety of Life at Sea, 1974 as amended, as applicable for vessels the keels of which are laid on or after 1st January 2019.
“SOLAS 90” means the International Convention for the Safety of Life at Sea, 1974 as amended by the IMO October 1988 amendments, which were adopted by resolution MSC.12(56) and entered into force on 29 April 1990.
“SOLAS A pack” means a liferaft emergency pack complying with the requirements of LSA Code
“SOLAS B pack” means a liferaft emergency pack complying with the requirements of LSA Code
“Standard fire test” means a test in which specimens of the relevant bulkheads, decks or other constructions are exposed in a test furnace by a specified test method in accordance with the Fire Test Procedures Code
“Standard Superstructure Height ‘hstd’” means standard superstructure height which shall be taken as-
  • (a) 1.8 metres for vessels up to 75 metres in length;
  • (b) 2.3 metres for vessels of 125 metres or more in length; and
  • (c) superstructure heights for vessels of intermediate lengths shall be obtained by interpolation
“STCW” means the International Convention on Standards of Training, Certification and Watchkeeping for Seafarers, 1978, as amended, as applicable for vessels the keels of which are laid on or after 1st January 2019.
“Steel or other equivalent material” means any non-combustible 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., aluminium alloy with appropriate insulation)
“Storm Covers” means a portable protective closure fitted to a glazed opening and which is fitted to the outside (weatherside) of the vessel. Also known as a Storm Shutter.
“Sub-division length or “(Ls)” of a ship means the greatest projected moulded length of that part of the ship at or below deck or decks limiting the vertical extent of flooding with the ship at the Design Waterline draft
“Submersible Craft” means any description of manned mobile submersible apparatus which is designed to maintain some or all of its occupants at or near atmospheric pressure including free, self-propelled, tethered, towed or bottom contact propelled apparatus and atmospheric diving suits.
“Superstructure” means a decked structure on the freeboard deck, extending from side to side of the ship or with the side plating not being inboard of the shell plating more than 4% of the breadth (B)
“Survival craft” means a craft capable of sustaining the lives of persons in distress from the time of abandoning the ship, including Liferafts, MES & Lifeboats
“Tender poles” means a rigging spar or specific pole used to aid in the launching of a tender, normally on sailing vessels to offset a halyard’s lead to give a vertical lift of a rescue boat
“Training manual” with regard to life-saving appliances means a manual complying with the requirements of SOLAS III/Part B – Life Saving Appliances and Arrangements, Regulation 35.
“Trim” means the difference between the draft forward and the draft aft, where the drafts are measured at the forward and aft terminals respectively, disregarding any rake of keel
“Two-way VHF radiotelephone set” means a portable or a fixed VHF installation for survival craft complying with the performance standards adopted by the IMO contained in A.762(18) or any Resolution amending or replacing it which is considered by the Administration to be relevant from time to time.
“Voyage” includes an excursion
“Watertight” means having scantlings and arrangements capable of preventing the passage of water in any direction under the head of water likely to occur in intact and damaged conditions and in the damaged condition the head of water shall be considered in the worst situation at equilibrium, including intermediate stages of flooding;
“Weather deck” means a deck which is completely exposed to the weather from above and from at least two sides
“Weathertight” means that in any sea conditions water shall not penetrate into the ship.
“Well” means any area on the deck exposed to the weather, where water may be entrapped and includes deck areas bounded on two or more sides by deck structures.
“Wheelhouse” means the control position occupied by the officer of the watch who is responsible for the safe navigation of the vessel.
“Window” means a ship's window, being any window, regardless of shape, suitable for installation aboard ships.
“Wing Station” means a manoeuvring station at which the vessel can be manoeuvred with increased visibility of the vessel side, normally with restricted navigational capability used when berthing rather than to hold a navigational watch

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