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Table 9-1.--Alarm, Safety, and Warning Systems--Continued
System
Importance
Readiness Class
Circuit
Navigation horn operating system
NV
2
NH
Air lock warning
1
NV
QA
V
1
Air filter and flame arrester pressure differen-
QD
tial alarm, or gasoline compartment exhaust
blower alarm
Oxygen-nitrogen plant ventilation exhaust alarm
SV
1
QX
NV
1
Turret emergency alarm
RA
NV
2
Safety observer warning
RD
Rocket and torpedo warning
SV
RW
3
4SN
Scavenging air blower high-temperature alarm
2
V
SP
Shaft position alarm
2
NV
Liquid level alarm
TD
1
NV
1TD
Boiler water level alarm
1
NV
Deaerating feed tank water level alarm
2TD
1
NV
Reactor compartment bilge tank alarm
5TD
1
SV
6TD
Primary shield tank, expansion tank level alarm
NV
1
Reactor plant fresh water cooling expansion tankd
7TD
1
NV
level alarm
8TD
Reactor secondary shield tank level alarm
1
NV
Lubricating oil sump tank liquid level alarm
9TD
1
SV
11TD
Induction air sump alarm
SV
1
12TD
Diesel oil sea water compensating system tank
1
SV
liquid level alarm
14TD
Auxiliary fresh water tank low-level alarm
NV
1
16TD
Pure water storage tank low-level alarm
SV
1
17TD
Reserve feed tank alarm
NV
1
18TD
Effluent tanks and contaminated laundry tank
1
V
high level alarm
presence of fires or overheated conditions in impor-
Relay Switches
tant compartments or spaces,
Relay switches are used in critical circuits to
A mercury thermostat (fig. 9-1) consists of a
sense power failure. Power failure causes the relay
column of mercury in a glass tube. Three electrical
contacts to close and initiate an alarm.
contacts are sealed into the glass tube. A resistor is
Mercury Thermostats
connected in parallel with the top and middle
contacts. The theme contacts along with the resistor
Mercury thermostats are used with the high-
and the mercury form a path for current flow. A
temperature alarm system (circuit F) to detect the
9-4

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