COMPARTMENT DESIGNATION/DECK NUMBERING SYSTEM

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Basic Military Requirements (BMR) - Requirement for military advancement
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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. The following is an example of compartment designation for a ship: 8-11 Student Notes: Figure 8-11.—Compartment designations. Figure 8-12.—Deck numbering system.

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