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Naval Orientation - Military manual for administrative purposes
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Compartment Numbering System
The complete decks below the main deck (fig. 17-2) are   the   second   deck,   third   deck,   and   so   forth. Partial decks that do not extend continuously from bow   to   stern   have   special   names,   such   as   the following: Forecastle deck: A partial deck above the main  deck at  the  bow.  It  is  used  primarily  on  merchant  ships and is designated the 01 level on naval ships. Upper  deck:  Above  the  main  deck  from  the  bow  to abaft  amidships  on  merchant  ships.  It  is  referred  to in naval ships as the 01 level. Succeeding levels above are named the 02 level, 03 level, and so forth. Poop deck: Above the main deck in the stern, usually only in merchant ships. It is designated the 01 level on naval ships. Platform   deck:   Below   the   lowest   complete   deck. Platforms  are  numbered   downward,   such   as   first platform, second platform, and so on. Miscellaneous   working   platforms   or   flats consisting  of  gratings  are  located  in  the  machinery spaces.  These  platforms  aid  in  the  access  to  and operation of the ship’s propulsion equipment. In  addition  to  the  foregoing  nomenclature, some decks are known by names describing their use or   function.   In   aircraft   carriers   the   uppermost complete   deck   is   the   flight   deck,   and   the   deck immediately  below  it  is  the  gallery  deck.  The  main deck  is  known  as  the  hangar  deck.  The  levels  or decks above the hangar (main) deck are called the 01 level  (first  level  above  the  hangar)  and  the  02  level (second  level  above  the  hangar),  The  gallery  deck  is also known as the 03 level and the flight deck as the 04 level. COMPARTMENTATION A  cargo  ship  has  only  a  few  decks,  and  its bulkheads are widely spaced. The resulting compartments are identified  by  their  primary  purpose, such as cargo holds. In some cases, cargo holds are large enough to accommodate many tons of cargo. Passenger ships  have  smaller  holds,  the  remainder  of  the  space being divided by decks and bulkheads into smaller living compartments  for  passengers.  Naval  ships  are  usually more extensive y compartmented than merchant ships. Their   watertight   compartmentation   is   more   than   a matter   of   dividing   or   segregating   various   activities aboard  ship.  The  ability  of  a  naval  ship  to  withstand damage depends largely upon its compartmentation. In case   of   damage,   the   watertight   boundaries   of   the compartments   restrict   floodwaters   and   stand   as   a barrier between them and the undamaged portion of the vessel. Extensive compartmentation lessens the amount of seawater that will enter the vessel through a rupture in its shell plating. Watertight Integrity If   a   compartment   is   not   watertight,   it   is useless    as    a    flood    barrier.    The    quality     of watertightness is known as watertight integrity. The greater  the  watertight  integrity  of  a  compartment, the  more  effectively  it  limits  flooding.  The  battle  to maintain  the  watertight  integrity  of  the  ship  as  a whole is a complicated and never-ceasing one. Many members of a ship’s crew spend hours patrolling and inspecting   the   ship   to    maintain    its    watertight integrity and keep it in battle trim. Figure 17-2.—Decks and platforms divide the ship into tiers of compartments. 17-4

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