Sprinkling Alarm System (CKT FH)

Maintenance should be accomplished according

To monitor the diesel generators, a temperature

to the applicable technical manual and maintenance

switch with a supervisory resistor across its contacts

requirement cards (MRCs).

is located in each acoustic cell and three flame

detectors are located at critical points about each

SPRINKLING ALARM SYSTEM (CKT FH)

diesel generator.

At each gas turbine, the photoelectric cells in the

Circuit FH is classified as semivital readiness

flame detectors produce a signal when exposed to a

class 1. This circuit provides a means of indicating

flame condition. This signal operates a local contact

leakage or flow of water in the sprinkling system lines

closure. This closure is transmitted to the local

for various protected spaces.

operating station, where it energizes an alarm

This system has four water switches and two

indicator mounted on the adjacent instrument panel.

pressure switches. Abnormal conditions are displayed

The signal is also transmitted to the PCC, where it

on the circuit FH modules in the damage control area

energizes a second alarm indicator. This circuit is

of the central control station (CCS).

supplemented by a push button, mounted at the

enclosure access, operation of which also energizes

Any leakage or flow of water in the lines to the

both of these alarms. Push buttons at the console and

small arms magazine, the trash disposal room, the

the local operating station provide a means for

torpedo magazine, or the 76mm ammunition

shutting down the engine room ventilation supply and

magazine will actuate the switch and provide alarm

exhaust fans. The status of the enclosure door is

indication on the associated module in the circuit F

displayed at the console.

alarm switchboard in the damage control area of the

CCS. The switches for the small arms magazine and

When the temperature in the acoustic cell reaches

trash disposal room are equipped with supervisory

a predetermined level, the contacts of one or both

resistors. Since the torpedo magazine and the 76mm

temperature switches close and complete the circuit to

ammunition magazine use common alarm modules for

a console alarm indicator.

circuits FD and FH, the water switches for the

At each diesel generator, photoelectric cells in the

sprinkling system in these areas are not fitted with

flame detectors produce a signal when exposed to a

supervisory resistors since the resistors are in the level

flame condition. This signal is transmitted to flame

switches of circuit FD.

signal conditioner. The conditioner transmits the

The sprinkling system for the Mk 13 Mod 4 guided

alarm signal to the electric plant control console.

missile launcher system (GMLS) magazine is

When temperature in the acoustic cell reaches a

provided with three separate alarms. Normally, the

predetermined limit, the contacts of the temperature

accumulator tank in the magazine is filled with water

switch close and complete the circuit to a module of

under pressure. A sensor in the magazine, on detecting

the local alarm switchboard with an extension signal

a dangerous condition, releases the water in the tank,

to a vent fan shutdown relay assembly. The energized

thus reducing the pressure; and its alarm switch closes,

relays disconnect power to the machinery room,

activating an alarm module on the circuit F alarm

supply, and exhaust fans.

switchboard.

Checkout procedures for the gas turbine high-

In the alarm system for the missile injection

temperature and flame detector circuit are contained

system compression tank, the alarm actuation is the

in the Electric Plant Control Console Technical

same as for the Mk 13 Mod 4 GMLS magazine

Manual. Checkout procedures for the diesel generator

accumulator tank.

high-temperature alarm circuit are contained in the

The supervisory resistors for the accumulator tank

Electric Plant Control Console Technical Manual.

and the eductor valve Mk 13 magazine alarms are

Power for all gas turbine circuits is taken from the

mounted in a common junction box No. C-17, located

PCC. Power supply for the diesel generator flame

in the a/c machinery room on the first platform.

detector circuit is taken from a local 120 Vac

The supervisory resistor for the missile injection

distribution box, while the power supply for the diesel

system compression tank is located in the pressure

generator high-temperature circuit is taken from the

switch.

alarm switchboard.

9-22