Flooding Alarm System (CKT FD)

system at the EOS area of the CCS. This system is

FLOODING ALARM SYSTEM

(CKT FD)

classified as semivital readiness class 2.

A pressure transducer of the pressure-to-current

Circuit FD provides indication when the water level

type is provided at the hydraulic oil power module.

in the monitored compartments has reached a predeter-

Differential pressure transducers of the pressure-

mined level. This circuit is classified as nonvital readi-

to-current type are provided at the main and standby

ness class 1.

hydraulic pump suction strainers.

The system consists of magnetically operated liquid

switches, which are installed in the lowest level of the

The transducer transmits a dc signal, proportional

monitored compartment. The alarm modules are in the

to pressure, to a signal conditioner located in the local

alarm switchboard in the damage control area of the

operating station. Hydraulic oil pressure is displayed

CCS.

at the PCC on a pressure meter and on the digital

The float-type switch in each space is fitted with a

demand display. This pressure is continuously

supervisory resistor to maintain the supervisory feature

monitored so that if, at any time, pressure drops below

of the alarm module. In spaces fitted with more than one

a predetermined value, visual and audible alarm

switch, the resistor is installed in the one at the end of

indicators are energized at the PCC and at the local

the line.

operating station.

Operation of any switch by a rising liquid level will

short-circuit the line, initiating an alarm on the alarm

Each differential pressure transducer transmits a

switchboard as previously described.

signal proportional to the pressure drop in the pump

Extension alarms are provided via the supple- men-

suction strainers to a signal conditioner in the local

tal relay of circuit F as follows except for the fire pump

operating station. The signal is transmitted to the PCC

room, which has no extension:

for conversion to a demand digital display. Internal

circuitry provides the signal for visual/audible alarm

-- Individual extensions of all alarms to the dam-

age control console except that the extensions for the

indicators when differential pressure reaches a

sonar cooling equipment room and the sonar equipment

predetermined value.

room are paralleled to activate a common indication at

Checkout procedures for this system can be found

the damage control console.

on the appropriate PMS cards and in the Propulsion

-- Individual extensions of the alarms for engine

Control System Technical Manual.

room, a/c machinery room, auxiliary machinery rooms

Power for the circuits is furnished by the PCC.

1,2, and 3, eductor room, auxiliary propulsion machin-

ery room, and steering gear room to the auxiliary control

AIR PRESSURE INDICATING AND

console.

ALARM SYSTEM (CKT EK)

-- Common circuit FD alarms to the alarm switch-

boards at the OOD station No. 1 and in the pilothouse

Circuit EK provides a means of indicating the

ship control console (SCC).

pressure in the compressed air system and indicating

Troubleshooting and repair of the system can be

when the air pressure drops below a predetermined

accomplished by using the system checkout procedures

value. It also provides an indication of emergency

for testing the circuitry of the alarm switchboards and

shutdown of the compressors. This circuit is classified

associated connections by switch- board test procedures

as nonvital readiness class 1.

and by using applicable Planned Maintenance System

(PMS) cards.

Pressure transducers and pressure switches are

Power for each circuit is provided from the alarm

located in the piping for the system.

switchboard.

Each transducer is a pressure-to-current type that

transmits a dc signal, proportional to the pressure, to

PROPELLER PITCH CONTROL

a signal conditioner in the auxiliary control console.

HYDRAULIC OIL INDICATING AND

The HP and LP air receiver pressures are displayed on

LOW PRESSURE AND ALARM SYSTEM

digital demand display. The HP range is 0 to 6000 psig

(CKT 3EG)

and the LP range is 0 to 200 psig. These pressures are

continuously monitored so that if, at any time, the

Circuit 3EG provides means for indicating and

alarming low pressure in the propeller hydraulic oil

pressure drops below a predetermined value, visual

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