How do you read a compartment number on a ship?
They are numbered from the centerline outboard. For example, the first compartment outboard of the centerline to starboard is 1; the second, 3; and so on. Similarly, the first compartment outboard of the centerline to port is 2; the second, 4; and so on.
How are decks numbered on a Navy ship?
Deck Number: The Main Deck is always 1. The first deck below the main deck is 2, while the second deck below is 3. The first deck above the main deck is 01, the second is 02. Frame Number: The frame number at the foremost bulkhead of the enclosing boundary of a compartment is its frame location number.
What is compartment number?
Compartments are numbered for identification to facilitate location. The identification number assigned locates each compartment specifically and generally indicates the function and use of the compartment. Compartment numbers consist of four parts, separated by hyphens, in the following sequence: a.
What are compartments on a ship?
A compartment is a portion of the space within a ship defined vertically between decks and horizontally between bulkheads. It is analogous to a room within a building, and may provide watertight subdivision of the ship’s hull important in retaining buoyancy if the hull is damaged.
What are the levels of a ship called?
On ships with more than one level, ‘deck’ refers to the level itself. The actual floor surface is called the sole; the term ‘deck’ refers to a structural member tying the ships frames or ribs together over the keel.
How are ship frames numbered?
The frames between the forward perpendicular and the aft perpendicular are identified by numbers. The forward perpendicular is identified by the number 0 (zero). Each frame aft of the forward perpendicular will carry the next higher consecutive number. The last numbered frame is the aft perpendicular.
What is the lower deck of a ship called?
orlop
The orlop is the lowest deck in a ship (except for very old ships). It is the deck or part of a deck where the cables are stowed, usually below the water line.
Why is it called a poop deck?
We quote verbatim: “The name originates from the French word for stern, la poupe, from Latin puppis. Thus the poop deck is technically a stern deck, which in sailing ships was usually elevated as the roof of the stern or “after” cabin, also known as the “poop cabin”.
What is inside a ship called?
The floors of a ship are called decks, the walls are called bulkheads, and the stairs are called ladders. Openings in the outside of the ship are ports, not windows. Entrances from one compartment to another are called doors. Openings from one deck to another are called hatches.
How many compartments does a submarine have?
It is divided into eight watertight compartments, separated by pressure bulkheads provided with watertight pressure resistant doors. The ninth compartment, the conning tower, in the shape of a cylinder placed on its side, is located above the control room and connects with the control room through the access hatch.
What do the numbers on a ship’s compartment numbers mean?
After 1949, each compartment was given a number indicating that compartment’s deck number, frame number, relation to the centerline of the ship, and usage. A hyphen separates the numbers and letters representing each type of information. The following is an example of a compartment number and what each part of the number represents:
When did the US Navy start assigning compartment numbers to ships?
U.S. Naval Ship Compartment Designations (Since 1949) (Created October 2017) References: Introduction to Naval Engineering, 2ndEditionby Blank, Bock & Richardson In U.S. Naval ships constructed after March 1949; each space (except for minor spaces such as clothes lockers) is assigned a compartment number.
What is an example of a compartment number?
The following is an example of a compartment number and what each part of the number represents: Deck Number – Frame Number – Centerline – Usage 3-75-4-M 3– third deck 75– forward boundary at or immediately abaft of frame 75 4– second compartment outboard of CL to port M– ammunition compartment DECK NUMBER– The main deck is deck number 1.
What is a fractional number on a ship?
Fractional numbers are used only when frame spacing exceeds 4 feet. RELATION TO CENTERLINE– Compartments through which the centerline of the ship passes carry the number 0 in the third part of the compartment number. Compartments located completely to starboard of the centerline have odd numbers; those completely to port bear even numbers.