The onboard drawings are filed in numerical
located in DCC and in the various repair party lockers.
sequence. On most ships, they are kept in file cabinets in
During casualties, these drawings may be used to plot
the log room. However, they may be filed in a technical
c a s u a l t i e s a n d p r ov i d e a n ove r v i ew f o r t h e i r
library or the microfilm library on aircraft carriers,
coordination.
tenders, and repair ships. Although you may use
On the isometric damage control diagrams, each
blueprints and drawings for damage control purposes,
deck or platform is shown at a separate level.
you will primarily use the isometric damage control
Compartments that are not intersected by a particular
diagrams, as shown in figure 2-15. These diagrams are
deck are not shown on the diagram for that deck.
three-dimensional. They are developed and provided
Instead, they are drawn as part of the deck from which
under strict requirements set forth by NAVSEA.
they extend. Heavy lines indicate watertight and oiltight
When NAVSEA furnishes a group of ships their
boundaries. Lighter lines indicate airtight, fumetight,
diagrams, the ship's force must verify the diagrams for
and nontight boundaries.
accuracy. Corrections should be made to show the actual
installation within the ship. To read these diagrams
The isometric damage control diagrams show
correctly, you need to recognize the standard symbols
piping systems as close as possible to their actual
used. A few of these symbols are shown in figure 2-16.
shipboard locations. All piping and fittings that are
Each diagram will have a key, which will identify the
actually contained within a compartment are shown in
symbols used on that diagram. As a rule, the different
that compartment on the diagram. However, the
systems are drawn in different colors. This makes it
precise location may be shifted a little to make the
easier to distinguish one system from another.
diagram clear and readable. Dotted lines and
Isometric damage control diagrams that are not kept
cross-hatchings indicate hidden boundaries, piping,
in the damage control books are usually sealed in
and valves. Usually the isometric damage control
plastic. They are stowed in special cabinets and are
diagrams are not drawn to scale.
REVIEW QUESTIONS
Q10. What types of drawings does a Damage
Controlman use most often?
1.
Working drawings and site plans
2.
Structural and architectural drawings
3.
Rough sketches and geometric drawings
4.
Blueprints and isometric damage control
diagrams
Q11. Damage control central and the various repair
lockers are locations that may use isometric
damage control diagrams during a casualty.
1.
True
2.
False
Q12. On an isometric damage control diagram,
what types of information are indicated by
dotted lines and cross-hatchings?
1.
Telephone lines and working areas
2.
Hidden boundaries, piping, and valves
3.
Fire hose lines and hatch openings
Figure 2-16. Some symbols used on damage control diagrams.
4.
Water lines and watertight doors
2-21
