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COMPARTMENT DESIGNATION/DECK NUMBERING SYSTEM Learning  Objectives:  When you finish this chapter, you will be able to— Recall compartment designations. Recall deck lettering and numbering systems. Every space in a ship (except minor spaces, such as pea  coat  lockers,  linen  lockers,  and  cleaning  gear lockers)  is  assigned  an  identifying  letter  and  number symbol. This symbol is marked on a label plate secured to  the  door,  hatch,  or  bulkhead  of  the  compartment. Compartments on the port side end in an even number and those on the starboard side end in an odd number (fig.  8-11).  A  zero  precedes  the  deck  number  for  all levels  above  the  main  deck.  Figure  8-12  shows  the system of numbering decks. Ship’s compartment designations consist of a deck number,  a  frame  number,  the  relationship  of  the compartment to the centerline, and a letter showing the use of the space. Where a compartment extends through two or more decks, the number of the lower deck is used. The frame number indicates the foremost bulkhead of the compartment. If the forward boundary is between frames, the frame number farthest forward within the compartment is used. Compartments located on the centerline carry the number  0.  Compartments  to  starboard  are  given  odd numbers,  and  compartments  to  port  are  given  even numbers. Where two or more compartments have the same deck and frame number, they have consecutively higher odd or even numbers, as applicable, numbering from  the  centerline  outboard.  For  example,  the  first compartment to starboard is 1, the second is 3, and so on. To port of the centerline, they are numbered 2, 4, and so on. When the centerline passes through more than one  compartment  with  the  same  frame  number,  the compartment  having  the  forward  bulkhead  through which  the  centerline  passes  carries  the  number  0. Compartments above the main deck are numbered 01, 02, 03, as applicable, shown in figure 8-12. The  last  part  of  the  compartment  number  is  the letter that identifies the primary use of the compartment. On dry and liquid cargo ships, a double letter is used for cargo  holds  to  differentiate  them  from  spaces containing the same commodity for use by the ship (for example, fuel oil). Compartment usage in the present system is shown in table 8-1. 8-11 Student Notes: Figure 8-11.—Compartment designations. Figure 8-12.—Deck numbering system.

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