Quantcast Table 9-1.--Alarm, Safety, and Warning Systems - Cont'd -141200355
 

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Table 9-1.--Alarm, Safety, and Warning Systems--Continued
Circuit
Readiness Class
System
Importance
Seawater expansion tank low-level alarm
19TD
SV
1
20TD
1
Gasoline drain tank high-level alarm
Sv
21TD
NV
Moisture separater drain cooler high-level alarm
1
24TD
Reactor plant on board discharge tank level alarm
V
1
Crossover drains high-level alarm
1
25TD
SV
29TD
Sonar dome fill tank low-level alarm
1
SV
30TD
JP-5 fuel drain tank high-level alarm
2
SV
TW
1
Train warning system
NV
W
2
Whistle operating system
NV
Legend:
V-Vital
SV-Semivital  NV-Nonvital.
1-Continuously energized-supply switch color code yellow.
2-Energized when preparing to get underway, while underway, and until the ship is secured-
supply switch color code black.
3-Energized during condition watches-supply switch color code red.
4-Energized only when required-supply switch color code white.
All electronic type alarm systems formerly designated as circuits CA, FC, FW, G, GD, GJ, GN,
and FP are now classified as a portion of the respective announcing system with which they are
associated.
mercury thermostat functions somewhat like a
the mercury to rise in the tube. When the mercury
reaches the top contact, the resistor will be shunted
thermometer in that the column of mercury rises as
from the circuit, and the current will increase, The
temperature increases. Under normal conditions, a
increase in current will cause a relay contact to close
small amount of direct current flows from one side of
and initiate an alarm.
the line through the resistor, the middle contact, the
mercury, the bottom contact, and back to the other
Mercury thermostats are installed in the overhead
side of the line. An increase in temperature will cause
of magazines, storerooms, paint lockers, and other
Figure 9.1.--Mercury thermostat.
9-5

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