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What includes ship intercom system?

Intra-Ship Communications System Introduce

Intra-ship communication system and signaling devices used on board ships mainly include:

1) a variety of telephone communication equipment of different modes and purposes, for example: acoustic power telephones, co-electric command telephone systems and automatic telephone equipment;

2) electrical summoning bells and various indicating instruments for ship maneuvering, e.g.: cabin summoning bells, rudder angle indicators and electric tachometers;

3) Various alarm signal devices for emergency situations, such as: emergency mobilization alarm bells, smoke and temperature measuring alarm devices;

4) various signaling devices for ship navigation, e.g. navigation lights, signal lights, automatic foghorn;

5) Marine broadcasting sound equipment, such as marine command PA.

China Classification Society  CCS ” steel seagoing ship classification and construction norms” on the “ship communication and signaling equipment” as follows:

  1. General requirements
  2. (1) A variety of different uses of the ship’s communication devices, the sound signal should be different tones, in order to identify.

(2) with 2 or more devices working in parallel with the ship’s communication devices, when one (or several) equipment cut off or failure, should not affect the work of the remaining equipment.

(3) All kinds of automatic sound and light alarms, should be equipped with a device that can cut off the sound signal without cutting off the light-emitting signal.

(4) All kinds of automatic alarm and indication signaling systems shall be provided with a test device to check whether their action is normal.

(5) Important indicators installed on the driver’s platform should be properly illuminated and have a brightness regulator or shade.

batterless telephone 500 1

  1. Telegraph

(1) In the ship should be set to send the command of the bridge to the cabin of the host commanding bell, the host commanding bell should be equipped with a repeating device.

(2) should be set up in the pilot’s station in the main engine signaling bell of the loss of power auditory and visual alarm, the alarm should be generally powered by battery.

(3) The mainframe signaling bell system shall generally have a mainframe misdirection alarm device near the mainframe console.

(4) If there are 2 or more transmitters, there should be a mechanical or electrical linkage or interlocking device between each transmitter.

telegraph receiver

  1. Telegraph and other communication equipment

(1) the following premises between the telephone as the main means of communication. Should be sound power telephone or battery-powered command telephone:

(1) Pilot’s station – cabin;

② cockpit an emergency steering station and helm station; (the above ①, ② should be a direct telephone)

③ Pilot’s station – fire alarm signal station and centralized control station for fire fighting equipment, bow and stern;

(iv) A radio room on the bridge.

(2) The telegraph should ensure that the call is clear under various working conditions of the ship.

(3) Telephones installed in noisy compartments shall be installed in soundproof rooms or soundproof enclosures if they affect calls.

(4) Emergency communication equipment in the form of fixed, portable or both shall be provided for two-way communication between the emergency control station on board, the place where life rafts are assembled and boarded, and vital parts such as the bridge and fire control station.

  1. General emergency alarm system

(1) The ship shall be equipped with a general emergency alarm system with a one-way transmitter, which shall be heard throughout the ship in all living quarters, in places where crew members normally work, and on the open decks of passenger ships. On passenger ships, this alarm signal shall be sent to the crew and passengers through two separate sets of lines.

(2) The universal emergency alarm system shall be capable of automatically switching to emergency power supply when the main power supply fails.

(3) The universal emergency alarm system shall be capable of being controlled from the bridge and fire control station.

(4) The distribution box for the universal emergency alarm system shall be located in suitable premises above the bulkhead deck.

(5) The sound pressure level of the acoustic alarm signal shall be at least 75 dB(A) at the sleeping position in the habitation cabin and 1 m from the source when all doors and passages are closed and at least 10 dB(A) above the ambient noise level of normal equipment operation when the ship is underway in better weather conditions.

(6) Except for electric bells, the frequency of various audible signals shall be between 200 – 2,500 Hz.

commanding batteryless telephone

  1. Cable broadcasting system

(1) There should be able to effectively send instructions to the residence, services, control stations and open deck of the wired broadcasting system.

(2) In the event of failure of the main power supply, the wired broadcasting system shall be automatically switched to the emergency power supply.

(3) If the wired broadcasting system can meet the appropriate requirements as well as the requirements of the general emergency alarm system, it can also be used as a general emergency alarm system and send fire alarm signals.

  1. Other alarm devices

(1) Audible and visual alarms shall be provided in the kitchen to ensure that a distress signal can be sent when staff are accidentally confined in the catering cooler.

(2) Watertight door closing and opening indicating devices and audible alarms to forewarn of watertight door closure shall comply with the relevant provisions of the current SOLAS Convention.

(3) Fire extinguishing agent application preview signals and other auditory and visual alarm devices shall comply with the following provisions:

(i) An automatic audible alarm device for the application of fire extinguishing agent shall be provided for any premises where persons are regularly working inside or entering or leaving the premises. The alarm device should work at least 20s before the application of extinguishing agent.

(ii) The carbon dioxide system shall be provided with 2 sets of independent control devices to apply carbon dioxide to the protected premises and to ensure the operation of the alarm device. One set of control devices shall be used to discharge the gas from the stored container; the other set shall be used to open the valve installed in the pipeline that transports the gas to the protected premises.

Intra-ship communication equipment and systems

Telephone communication systems used in ships are: intercom (through) telephone system; command telephone system; automatic telephone system.

  1. Telephone

The telephone has sound power telephone, ordinary telephone, automatic telephone.

1) sound force telephone (corresponds to the direct telephone system)

The acoustic telephone changes the size of the air gap in the magnetic circuit to realize the conversion between sound and electricity.

2) Ordinary telephone (for manual exchange)

There are two major types of ordinary telephones: magnet type and co-electric type, which are used in conjunction with magnet type artificial exchanges and co-electric type artificial exchanges respectively.

3) Automatic telephone sets (for automatic telephone exchanges)

Automatic telephone than the common electric type ordinary telephone more than a control of the connection of the signal sending device, it is with the automatic telephone supporting the use of the telephone.

  1. Marine intercom telephone system

Walkie-talkie telephone system is a direct fixed connection with two acoustic power telephone, also known as through the phone, mostly used in the ship between the important parts of the contact.

  1. Marine command telephone system

Command telephone system not only maintains the advantages of intercom telephone system, fast, reliable, simple, etc., but also can realize from a place to send out the command, many places at the same time to receive, coordinate the work between the compartments of the purpose. The command telephone system used by the ship has two kinds of command switchboard telephone system and single switchboard switchboard telephone system

Command switchboard telephone system consists of a (or several) switchboard and a number of single (extension). Command switchboard can be connected to any one of the extensions or switchboard alone; can also be all (or part of) with all the extensions and switchboard at the same time. However, the extension or other switchboard can not directly talk to each other, only through the command switchboard to talk after the renewal, and by the command switchboard monitoring.

  1. Marine automatic telephone system

Automatic telephone is not required by a person (operator) on duty automatic telephone exchange and a number of automatic telephone composed of a switchboard known as the switchboard, it can drive the number of telephone units known as the capacity of the switchboard. The automatic telephone exchange is categorized as follows:

(1) Electromechanical type

① step system: the user’s telephone directly controlled type;

(ii) Rotary: indirectly controlled by the user’s telephone set;

③ vertical and horizontal: indirectly controlled by the user’s telephone set.

(2) Electronic

① semi-electronic: the control part is electronic, the connection part of the ordinary electromagnetic components;

② quasi-electronic: control part of the electronic, the connection part of the reed (reed);

③ full electronic: control and succession part of all electronic.

automatic telephone


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