Meaning of Lines

handle them with care. Here are a few simple rules to

Meaning of Lines

follow to preserve these prints.

To be able to read and verify blueprints, you must

-- Keep prints out of strong sunlight because they

acquire a knowledge of the use of lines. The alphabet of

will fade.

lines is the common language of the technician and the

-- Do not allow prints to become wet or smudged

engineer.

with oil or grease. Oil and grease seldom dry out

In drawing an object, a draftsman not only arranges

completely; therefore, if the prints become wet

the different views in a certain reamer, but also uses

or smudged with oil or grease, they become

different types of lines to convey information. Line

practically useless.

characteristics, such as width, breaks in the line, and

zigzags, have meaning, as shown by figure 3-6. Figure

-- Do not make pencil or crayon notations on a print

3-7 shows the use of standard lines in a simple drawing.

without proper authority. If you receive

instructions to mark a print, use an appropriate

SHIPBOARD BLUEPRINTS

colored pencil and make the markings a

permanent part of the print. Yellow is a good

Various types of blueprints (usually referred to as

color to use on a print with a blue background

plans) are used in the construction, operation, and

(blueprint).

maintenance of Navy ships. The common types are as

-- Keep prints stowed in their proper place so they

follows:

can be readily located the next time you want to

Preliminary plansSubmitted with bids or other

refer to them.

plans before award of a contract

Most of the prints you will handle will be received

Contract plansIllustrate design features of the

properly folded. Your main concern will be to refold

ship that are mandatory requirements

them correctly. You may, however, have occasion to

receive prints that have not been folded at all or that have

Contract guidance plansIllustrate design

been folded improperly.

features of the ship subject to development

The method of folding prints depends upon the type

Standard plansIllustrate arrangement or details

and size of the filing cabinet and the location of the

of equipment, systems, or components for which

identifying marks on the prints. It is preferable to place

specific requirements are mandatory

identifying marks at the top of prints when filing them

Type plansIllustrate general arrangement of

vertically and at the bottom right-hand corner when

equipment, systems, or components that arc not

filing (hem flat. In some cases, construction prints are

necessarily subject to strict compliance as to

stored in rolls.

details, provided the required results are

accomplished

ELECTRICAL PRINTS

Working plansContractor's construction plans

that are necessary for construction of the ship

Navy electrical prints are used by the IC Electrician

in the installation, maintenance, and repair of shipboard

Corrected plansWorking plans that have been

electrical equipment and systems. These prints include

corrected to illustrate the final ship and system

various types of electrical diagrams as defined in the

arrangement, fabrication, and installation

following paragraphs.

Onboard plansA designated group of plans

PICTORIAL WIRING DIAGRAMA diagram that

illustrating those features considered necessary

shows actual pictorial sketches of the various parts of a

for shipboard reference.

piece of equipment and the electrical connections

between the parts.

HANDLING BLUEPRINTS

ISOMETRIC WIRING DIAGRAMA diagram

that shows the outline of a ship or aircraft or other

Blueprints are valuable permanent records that can

structure and the location of equipment, such as panels

be used over and over if necessary. However, if you are

and connection boxes and cable run.

to keep these prints as permanent records, you must

3-8