Technical Requirements paga and Intercom System

A fully duplicated, dual redundant PAGA system shall be provided, which fully meets the requirements of all applicable local and international statutory regulations relating to offshore petrochemical facilities. The PAGA system is provided primarily for alarm tones and emergency announcements but shall also be used to broadcast other safety information and routine messages.

The PAGA system shall consist of two independent systems: PAGA A and PAGA B each having its controllers and supervision which are synchronized with a Master / Slave arrangement. The cable connections between the internal devices shall be arranged in a loop so that in case of a single interruption in the loop, the system will still operate normally. The system cable fault shall be reported at the controller.

The PAGA main cabinet systems “A” shall be installed in the Instrument Room of the Deck and “B” shall be installed in the Server room inside the LER Room New LQ (level 5). Each system will manage independent sets of loudspeakers, control and access panels.

The failure of either system will not reduce the coverage of alarm signals and announcements in any area of the facility. Failure due to damage in part of either System A or System B of the full PAGA system shall not affect operation of the other part.

Interface and distribution junction boxes to separate ‘A’ and ‘B’ sub-systems and routing shall be installed to allow the cables to terminate up to the loudspeakers. Maximum physical segregation will be foreseen between any similar device on the duplicate system.

All speakers already installed in the New LQ are wired to LER Room (level 5). These are out of this scope of supply.

System ‘A’ and System ‘B’ Loudspeakers shall be installed in all required areas.

The audio transmission in the system shall be in digital form except for the 100V loudspeaker lines from the power amplifiers.

Cable integrity surveillance system tones shall be pulsed repeatedly to line during normal operation, with line monitoring being carried out continuously.

All the field equipment (loudspeakers and bulk items such as JBs, cable glands, etc) installed internally the New LQ shall be ATEX certified for ZONE 2 IIB. For area with possibility of hydrogen gas release (e.g. battery room), all equipment should be ATEX certified for ZONE 1 II C or should be separated according to ATEX.

All cabling for the PAGA system, external to the equipment cabinets, shall be fire resistant. Access stations, used to make announcements, will be provided at the Radio Room (New LQ – Level 4), OIM Office (New LQ – Level 4), Process Control Room (New LQ – Level 4), Heli Lounge Office Area (New LQ – Level 4).

The PAGA system will allow the following forms of communication:

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  Emergency Speech: from all defined access panels to all zones of the platform which place.
  
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  Routine Speech: from full access panels to all of the platform which place.
  
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  General Plant Alarm tones: initiated automatically form the F&G system or manually from the access panel in the Process Control Room and from the Fire Alarm Push Button (MFA) in the Living Quarter and broadcast to all areas of the platform. Flashing beacons and horns will be activated in noisy areas at the same time.
  
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  Prepare to Abandon Platform Alarm tones: initiated manually from the access panel in Process Control Room and broadcast to all areas of the platform. All flashing beacons and horns will be activated in noisy areas at the same time.
  

Intelligible verbal announcements and audible alarm signals shall reach all locations where personnel may be present during normal operations. To ensure alarm synchronization between the two systems A & B, the designated Master system will generate all alarm tones.

The acoustic alarm tone will be detailed in the “Technical Specification for Telecom System” document N. 113A20-TL-SP-09516.

In areas where the background noise level is lower than 85 dBA, the system shall be set to produce a sound level for speech of at least 10 dB but not greater than 20 dB above the ambient noise level. The minimum sound level shall be 65 dBA and, at least, i.e. 20 dBA above speech interference level. Alarm tones shall be at least 6 dB above the background noise in all areas.

In areas where the background noise level equals or exceeds 85 dBA, flashing beacons shall be provided to supplement audible alarms.

The alarm level will be attenuated in the Process Control Room.

Emergency speech announcements will attenuate the alarm signal for the duration of the announcement. Alarm tones may be accompanied by emergency announcements, during which the alarm tone shall be reduced by up to 30dB, this level being adjustable from within the equipment.

Flashing beacons will flash throughout the announcement.

Routine speech announcements will be preceded with a chime.

Intercom Stations

Intercom stations consist of an internal loudspeaker, microphone and communication keys. Stations shall be provided within the Deck Area and provide transmission of voice, data (for signalling and complete control and monitoring of the intercom station) and the data transmission between the central exchange unit and the intercom stations based on ISDN standard.

In order to meet the high safety standards, the system shall provide the following monitoring functions:

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  Permanent supervision
  
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  Identification of failures
  
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  Independent generating of failure messages
  

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  Components of the central exchange unit (exchange control board, digital line cards, amplifiers, etc.)
  

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  Connected intercom stations - including cabling
  
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  Speaker line monitoring
  
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  Beacon line monitoring
  
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  Interface monitoring
  

All failures should be stored in an error file and can be viewed on an external notebook / PC. The system should also support SNMP and the connection to a Network Management System and should be able to report failure messages and status changes of event groups via SNMP traps.

An open system design shall be provided to offer easy integration and interface into different types of systems. For this reason, the respective interface components with the required software modules have to be part of the standard concept.

This shall include the following interface as a minimum:

a) Interface to Telephony System

The system shall provide an interface to the telephony system. This interface shall provide one-way communication and the capability for authorized users of the telephony system to activate the system remotely. The system shall provide several simultaneous voice channels (two voice channels) via a VoIP SIP protocol or analog interface.

b) Interface to Fire and Gas Alarm Systems

The interface to fire and gas alarm systems shall be realized via potential-free contacts. The information transmitted by this interface shall be utilized to drive customized warning and alarm scenarios within the communication system. Four (4) Fire and Gas interfaces shall be provided.

c) Interface to Entertainment system

The interface to Entertainment systems shall be realized via a potential-free contact in order to mute the entertainment audio during announcements and alarm.

Zone Selection Modules requirement
These modules shall be designed to distribute the amplifier power to different selectively

addressable speaker circuits / zones.

The number of zones will be detailed in following tables and will be according to the “Public

Address & General Alarm (PA-GA) block diagrams” document N. 113A20-TL-DG-09525 by

dividing the facility into:

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  Zone 1 : New Living Quarter Offices and Public Areas;
  
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  Zone 2 : Deck Production Areas (module 1, module 2, module 3, compressor module,
  

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  Open Process areas, Operational areas);
  
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  Zone 3 : Hull technical rooms and Operational areas;
  
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  Zone 4 : Deck Operational areas;
  
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  Zone 5 : Above Deck & External LQ areas
  
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  Zone 6 : Spare zone;
  

A+B System (two independent systems (System A and System B)) working simultaneously shall be provided.

The PAGA cabinet systems “A” and “B” shall be installed in the Instrument room of the Hull and in the LER inside the Living Quarter (level 5).

The power amplifiers required shall be installed in both systems, 50% of them are located in System A and 50% in System B.

Under normal operation, the A+B System provides coverage of 100%. In case one system fails, the second system still provides coverage of at least 50%; this will result in an acceptable speaker sound pressure level loss of 3 dB.

The installed power amplifiers in each system shall be configured in N+1 hot stand-by mode for additional redundancy.

Audio and control signals shall be always transmitted between both systems via a synchronized connection.

This ensures that there is no loss of control functions, and no time lag in the speaker’s output. The two systems shall perform like one system.

The telephone system shall be a VoIP technology based telephone system that supports

Connection to Public Switched Telephone Network (PSTN) through GSM Gates.

The telephone system will be the primary communications system for inter-personnel
communications, thus the system shall be designed and constructed to provide highest call
quality and continuous operation. The system shall be designed to accommodate specific requirements as well as future developments. It shall be modular in design so that should the system require expansion, units can be added without substantial system changes.

In plant areas shall be supplied N.7 analog ATEX type telephone sets. In high noise areas where the noise level exceeds 60 dB, telephones shall be mounted inside acoustic hoods. The hoods shall be made of yellow shock and impact resistant glass-fiber reinforced polyester(GRP) suitable for operation dka in a harsh marine environment. The attenuation shall be greater than 10 dB. The acoustic hoods will be provided with external visual and audible alarms. All visual and audible alarms shall be zone 1 certified. All external equipment shall be environmentally protected and certified for hazardous area. All analog phones located in deck area shall be connected to MDF in Living Quarter through multi-copper cables. All acoustic and flashing light beacon shall be supplied from MDF in Living Quarter.cj

The design and installation of all telecom system equipment shall be such that there is no possible risk of electrostatic discharge.

The VoIP gateway shall have the following LAN features:

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  24 FXO ports
  
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  SIP, H.323, MGCP protocol support
  
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  Manageable
  
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  Expandable
  

IP telephones shall have as minima the following features:

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  PoE power supply,
  
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  Desktop mounting,
  
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  Visual display
  
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  Multifunction keys,
  
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  Loudspeaker,
  
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  DTMF dialling,
  
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  Volume control,
  
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  Adjustable ringing level,
  
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  Hand free operation,
  
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  Direct key dialling,
  
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  Last number redial,
  
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  Hold key,
  
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  Mailbox functions.
  

Analogue outdoor phones, ATEX certified, will be suitable for use in hazardous areas, withstanding the extreme operating conditions they will be exposed to. The phones will be resistant to large temperature variations (0° C to +60° C), air humidity, sea water, dust and strong wear and tear.

The equipment shall be certified by an internationally recognized agency for use in hazardous dust and gas atmospheres. Hazardous area as a minimum : Zone 1, gas group IIB, T3. The phones shall be equipped with a stainless steel keyboard designed for use with gloves and with an alphanumeric display with clear representation of letters and numbers. Hands free operation feature ON⁄OFF will be available.

Acoustic and luminous signaling devices

The explosion proof secondary sounder (optical and acoustic) shall be ATEX certified, powered at 230 Vac - 60 Hz and IP66 protected. The sound level shall be ≥ 90dB (a) at 1m; optical signal shall be at least 5J yellow colored. Devices shall have call ringing indicator in order to be connected directly to telephone line.

Acoustic and luminous signaling devices shall be also connected to relative analog telephone in order to have connection to telephone line cable and allow beacon/sounder activation when a call is incoming.

Acoustic hood

The telephone protection hood cut out extraneous noise and improve audibility in noisy surroundings. The shape and the inner lining of sound - absorbing material reduces noise in the area of the telephone. Typically the protection hood shall be mounted with its back facing the noise source or loudest source.

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  Ethernet cable
  

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  Telephone cable
  

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  Beacon/sounder power cable