The term "machinery compartment" shall be construed as meaning boiler rooms, engine rooms, main motor rooms, and compartments in which auxiliaries of the main propelling machinery are located. Where the number of the compartments in the 1 to series exceeds in any principal division the matter shall be referred to the Bureau. These divisions shall be considered as extending from the keel to the highest deck in the line of the bulkheads, or the bulkheads prolonged.
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In case the bulkheads do not extend to the highest deck any space between decks that extends through two of the principal divisions shall be numbered as if it were situated entirely in the forward division of the two in which it is placed, and shall have this number only. Main compartments with y permanent openings to the top side, such as boiler rooms, shall be considered as completely bounded by tight structure for numbering purposes.
Compartments on-the starboard side of the ship shall have odd numbers; those on the port side, even numbers. All compartments and spaces that are completely bounded by watertight, oiltight, airtight, or fumetight structure shall be numbered. Where a watertight compartment located below the weather deck is divided into two or more airtight or fumetight spaces by airtight or fume tight bulkheads, the appropriate number shall be assigned the watertight compartment and each airtight or fume tight subdivision within the compartment shall be designated by the addition of a suffix to this number.
Thus, if watertight compartment AL contains a fumetight or airtight bulkhead the space to starboard of this bulkhead will be designated as AL and the space to port as AL.
Where an airtight or fumetight compartment is located in a watertight compartment which extends through two or more deck levels, the airtight or fumetight compartment shall be numbered as specified in the preceding paragraph, unless to do so would result in illogical numbering, in which case the matter shall be referred to the Bureau. Thus, a boiler room and its airlock would be numbered B and B, respectively. However, where reference is made in correspondence to the entire watertight space, the basic number without suffixes may be used, as B-1 or A Care shall be exercised to insure that each numbered compartment or space is bounded completely by tight structure, that is, assigning two numbers to adjoining spaces not separated by tight structure shall be avoided.
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Airtight and fumetight spaces located above the weather decks and outside of the hull proper, such as those in deck houses, shall each be given its own individual number without a suffix number, in the same manner as if each airtight or fume tight space were a separate watertight compartment. Thus, the number of an airtight or fumetight space on the superstructure deck may be AL, even though this space may be one of a number of airtight or fumetight spaces located within a deckhouse with watertight boundary.
Oiltight and watertight compartments on the main deck shall be numbered from to , and those on each successive deck or platform below the main deck shall be numbered in the next higher hundred series, namely those on the second deck shall be numbered from to ; on the third deck from to , etc. For example, a ship that has a superstructure, forecastle, main, second, and third deck, and a first and second platform, the oiltight and watertight compartments will be numbered as follows:.
It will be noted that the prefix zero of a compartment number indicates that the compartment is above the main deck. If there is not a third deck the compartments on the first and second platforms and in the hold shall be numbered to , to , and to respectively.
If there is a fourth deck the compartments on the fourth deck first and second platforms and hold shall be to , to , to , and to respectively. On modern destroyers the compartment numbers will be as follows:. Boiler and engine rooms shall be given the lowest numbers, B-1, B-2, B-3, etc. Where there is a half deck owing to the sheer or other cause, or where there is a fiat between regular decks, such as cofferdam fiat over oil tank, no change in the hundred series shall be made on account thereof. The above scheme of numbering is intended to give an indication of the vertical location of the compartment which, in connection with the divisional fore and aft location, will give a very fair idea of the position of the compartment.
When, after several plans involving compartment numbers have been completed, it becomes necessary to increase the number of compartmentshalf numbers may be assigned to the new compartments in order to avoid extensive renumbering. Half numbers. B for battery compartments, including:. When a space is devoted to several main purposes, two or more designating letters shall be used. Thus a living compartment containing secondary battery guns shall be designated B B L. The nomenclature used in correspondence, in specifications, and on plans for machinery spaces shall be as follows:.
Boiler Room. Boiler Central Control Station. Boiler Emergency Station. Engine Room. Engine Operating Station. Machinery Spaces.
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Label plates and tags shall be of two types-engraved and embossed, except historical label plates, which shall be cast. The material of cast brass label plates shall be in accordance with Navy Department Specifications 46B The material of engraved and embossed brass plates shall be in accordance with Navy Department Specifications 46B6. The material of aluminum alloy plates shall be in accordance with Navy Department Specifications 47 All or 47A Cast plates shall be as thin as consistent with good casting, and the figures and letters shall be raised and clearly defined.
Engraved plates shall be 0. Embossed plates shall be as heavy as can be satisfactorily embossed. All label plates shall have smooth edges. Tag label plates shall have smooth edges and round corners to prevent injury to personnel. The figures and letters on engraved plates shall be cut to a depth of 0.
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The enamel shall be black, except as otherwise specified. Engraved brass plates shall be polished and not painted. Engraved aluminum alloy plates shall be given a coat of spar varnish.
Embossed plates shall be painted and the figures and letters touched up with black paint. In general other label plates shall be of the engraved type. The combination of engraved plates and embossed plates in the same group of label plates shall be avoided.
US2945467A - Arrangement for ships' hatches - Google Patents
A sample plate of each type of label plates shall be finished and secured to a metal bulkhead for approval by the superintending constructor before proceeding with the work on the other plates. All plates shall be so located that the inscriptions are readily discernible. Where placed on one side only of a beam, they shall, where practicable, be on the after side in the forward part of the vessel and on the forward side in the after part of the vessel.
Plates found on completion to be obscured by curtains, rods, pipes, furniture, or other fittings shall be relocated. When special locations for label plates are necessary they shall be as approved by the superintending constructor. Where necessary to group several compartment label plates over a hatch or door to indicate that access to the several compartments is through the hatch or door, the inscription denoting the upper compartment, and placed on the same horizontal line when they denote compartments on the same deck level, port, starboard, or center, according to the location of the compartment with reference to the center line of the door or hatch.
These instructions describe in general the arrangements for labeling on shipboard, but additional label plates, tags, etc. Additional abbreviations may be used on inscriptions as recommended by the superintending constructor and approved by the bureau. Care shall be exercised, however, to insure that such abbreviations are reasonably self-explanatory.
A complete list of all abbreviations used in labeling, including abbreviations additional to those previously listed, shall be compiled and included in the vessel's damage control book.
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Abbreviated words shall be followed by a period. For long inscriptions, the sizes of the letters and figures shall be as large as con. The same size of label plate or tag for each group of subjects shall be maintained as far as practicable. The lines of letters and figures shall be symmetrically arranged with reference to the upper and lower edges of the plates or tags, and to each other when there is more than a single line.
Label plates shall be secured by round-head machine screws, by rivets or by round-head wood screws. Machine screws shall be used for securing to metal where the thickness will permit. Rivets shall be used where the thickness of the metal is not sufficient for machine screws. Wood screws shall be used for securing to wood. Brass fastenings shall be used for brass plates and corrosion resisting steel fastenings or aluminum rivets for aluminum label plates. In securing the label plates to outside plating and to oiltight or watertight structure, care shall be taken to avoid piercing the structure with the means of securing; namely, the hole for the machine screw shall not pierce the structure.
Where this is impracticable on light metal tight structure, the plate may be drilled through provided the point of the screw is peened over. If necessary to secure long embossed plates rigidly, two additional screws or rivets shall be added at the center of the plate, one at top and one at bottom, or one in the middle of the plate if interference with the numbers or letters is not caused thereby.
Care shall be taken that the heads of the screws or rivets do not cover any part of a number or figure. Label plates mounted on corrugated bulkheads or wire-mesh or expanded metal bulkheads shall be backed up with a metal strip. The brass label plates shall be set in red lead. The back of 40 aluminum alloy label plates shall be coated with zinc chromate iron oxide paint.
Compartment numbering shall be in accordance with the scheme outlined in chapter 2. The label plates shall be located, as far as practicable, to clearly indicate the compartment being entered. The inscription shall give the door, hatch, or manhole number and compartment description and number. Door, hatch, and manhole number plates shall be combined with compartment plates and, whenever possible, with capacity plates. Except as otherwise specified, labels on doors and hatches shall designate only the compartment to be entered.
In the case of hatches the labels shall designate only the space below. The label on a hatch or door opening into a trunk from which a number of compartments have access shall designate all such compartments. Similarly, the labels on hatches or doors so located in the normal access route that they serve as points of departure for access to a number of compartments normally kept locked, such as storerooms, shall designate all compartments so served.
The first line of the inscription shall give only the number of the hatch, door, or manhole. On the line below shall be given the compartment designation to which the door gives access, and on the third line shall be the compartment number, for example:. From the above it will be noted that the door, hatch, or manhole number will consist of two or three parts, separated by hyphens.
In this paragraph the term "door" includes hatches and manholes.
The first part corresponding to the deck number as given in chapter 2; the next part the frame number just forward of the hinge of the door, and the last part the number of the door, if there is more than one door on the same frame on the deck designated by the first part; if not, the third part may be omitted.
For the first part of their numbers, hatches and manholes shall take the number of the deck through which they are cut. Odd numbers shall be used in the third part for doors located on the starboard side and even numbers on the port side. For example:. Door , is on the third deck, frame 24, or between frames 24 and 25, starboard side. Door , is on the third deck, frame 24, or between frames 24 and 25, port side. Hatch , is in the third deck at or immediately aft of frame 24 on the port side.
Door, hatch, manhole, and compartment. Small doors into trunks, wing passages, etc. Where a hatch or manhole forms the access to a single compartment and the cover hinges against a bulkhead, the label plates shall be installed on the bulkhead just above the cover when it is hinged up, so that the label can be read with the cover either in the open or closed position. Where a hatch or manhole forms the access to a single compartment and the cover does not hinge against a bulkhead, the label plates shall be fitted on the top side of the cover.
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