Guidancefor Fire and Gas Detection

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Guidance forFire and Gas Detection


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¡Error! No se encuentra el origen de la referencia. Guidance on Industry Standard for Fire and Gas Detection

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Table of Contents

Page

Foreword ............................................................................................¡Error! Marcador no definido.

1. Scope........................................................................................................................................ 4

2. Normative references ...............................................................................................................4

3. Abbreviations ............................................................................................................................4

4. General .....................................................................................................................................5

4.1. Local codes and standards ............................................................................................5

4.2. Power supply .................................................................................................................5

4.3. Safety integrity level ......................................................................................................5

4.4. Electrical connections ....................................................................................................5

4.5. Vibration ........................................................................................................................5 4.6. Ingress protection ..........................................................................................................6

4.7. Switch and relay contact rating ......................................................................................6

4.8. Environmental protection ...............................................................................................6

4.9. Communications protocol ..............................................................................................6

5. Flame detection ........................................................................................................................6

5.1. Type ...............................................................................................................................6

5.2. Sensitivity ......................................................................................................................6

5.3. Response time ...............................................................................................................6

5.4. Alignment .......................................................................................................................6

5.5. Diagnostics ....................................................................................................................6

5.6. Output ............................................................................................................................6

5.7. Testing ...........................................................................................................................6

5.8. Field of view ...................................................................................................................7

5.9. False alarm immunity ....................................................................................................7

5.10. CCTV flame detectors ...................................................................................................7

5.11. Infrared flame detectors .................................................................................................7

5.12. Ultraviolet flame detectors .............................................................................................7

6. Flammable gas detection ..........................................................................................................7

6.1. Type ...............................................................................................................................7

6.2. Response time ...............................................................................................................7

6.3. System faults .................................................................................................................7

6.4. Output ............................................................................................................................7

6.5. Open path gas detectors ...............................................................................................8

6.6. Point infrared gas detectors ...........................................................................................9

7. Toxic gas detection ...................................................................................................................9

7.1. Sensitivity ......................................................................................................................9

7.2. Calibration .....................................................................................................................9

7.3. False alarm immunity ..................................................................................................10


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7.4. Environmental tolerance ..............................................................................................10

8. Gas leak detection .................................................................................................................. 10

8.1. Technology ..................................................................................................................10

8.2. Sensitivity .................................................................................................................... 10

8.3. Response time .............................................................................................................10

8.4. Testing ......................................................................................................................... 10 9. Heat detection......................................................................................................................... 10

9.1. General ........................................................................................................................ 10

9.2. Point detection (electrical/electronic) ...........................................................................10

9.3. Point detection (pneumatic) .........................................................................................11

9.4. Linear detection ...........................................................................................................11

10. Oil mist detection .................................................................................................................... 11

10.1. System configuration ...................................................................................................11

10.2. Sensitivity .................................................................................................................... 12

10.3. Response time .............................................................................................................12

10.4. Environmental tolerance ..............................................................................................12 10.5. System faults ...............................................................................................................12

10.6. Output .......................................................................................................................... 12

10.7. Testing ......................................................................................................................... 12

11. Smoke detection ..................................................................................................................... 12

11.1. Aspirating ..................................................................................................................... 12

11.2. Point detectors .............................................................................................................13

11.3. Open path ....................................................................................................................14

12. Manual fire alarm stations .......................................................................................................14

13. Panel equipment ..................................................................................................................... 15

13.1. Panel architecture ........................................................................................................15 13.2. Power supplies ............................................................................................................15

13.3. Operator interface ........................................................................................................15

13.4. Other system interfaces ...............................................................................................17

14. Certification inspection and testing .........................................................................................19

14.1. Certification and inspection .........................................................................................19

14.2. Factory acceptance test ..............................................................................................19

14.3. Site acceptance test ....................................................................................................19

15. Documentation........................................................................................................................ 19

Bibliography ..................................................................................................................................... 21


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1. Scope

This X provides guidance on industry standard for the design, materials, fabrication, inspection,

testing, documentation, and preparation for shipment of equipment for fire and gas detection.

2. Normative references

The following normative documents contain requirements that, through reference in this text,constitute requirements of this technical practice. For dated references, subsequent amendments to, or

revisions of, any of these publications do not apply. However, parties to agreements based on thistechnical practice are encouraged to investigate the possibility of applying the most recent editions of

the normative documents indicated below. For undated references, the latest edition of the normative

document referred to applies.

International Electrotechnical Commission (IEC)

IEC 61508-2 Functional safety of electrical/electronic/programmable electronic safety-related systems – Part 2: Requirements for

electrical/electronic/programmable electronic safety-related systems.IEC 61508-3 Functional safety of electrical/electronic/programmable electronic safety-

related systems – Part 3: Software requirements.

3. Abbreviations

For the purpose of this X, the following abbreviations apply:

AWG American wire gauge.

CCTV Closed circuit television.

ESD Emergency shutdown.

EMC Electromagnetic compatibility.

F&G Fire and gas.

FAT Factory acceptance testing.

FSD Full scale deflection.

HVAC Heating, ventilation, and air conditioning.

IP Ingress protection.

IR Infrared.

I/O Input and output.

LED Light emitting diode.

LEL Lower explosive limit.

LELm Lower explosive limit metre.


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LFL Lower flammable limit.

mA milliamps.

MAC Manual alarm contact (US definition).

MAC Manual alarm call point (UK definition).

MTBF Mean time between failure.

RHO Radiant heat output.

SAT Site acceptance testing.

SIL Safety integrity level.

T90 Time to reach 90% of scale.

TWA Time weighted average.

UEL Upper explosive limit.

UFL Upper flammable limit.

UV Ultraviolet.

Vdc Voltage direct current.

VDU Visual display unit.

4. General

4.1. Local codes and standards

Fire and gas detection equipment shall comply with local codes and standards.

4.2. Power supply

Detection equipment should operate on a nominal 24 Vdc power supply within a range of

18 Vdc to 32 Vdc.

4.3. Safety integrity level

Detectors used to ensure safety or protect the environment with a specified integrity level shall

comply with IEC 61508-2 and IEC 61508-3, and the assigned safety integrity level (SIL).

4.4. Electrical connections

a. Detection equipment shall have sufficient connection terminals for all electricalconductors, with one conductor per terminal.

b. Conductor sizes may be up to 2.5 mm2 (AWG 10).

4.5. Vibration

Detection equipment shall be designed to ensure correct operation during vibration up to 1 mm

(0.04 in) from 2 Hz to 60 Hz.


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4.6. Ingress protection

Detection equipment installed outdoors shall have an ingress protection rating of at least IP66

(NEMA 4).

4.7. Switch and relay contact rating

Relay contacts or switch contacts used for input circuits to the F&G panel shall have a minimum

rating of 1A at 24 Vdc.

4.8. Environmental protection

a. Detection equipment shall be suitable for the environment in which they are installed, andshall be protected from the effects of corrosion, dust, vibration, and hosing-downoperations.

b. Detection equipment may be fitted with protection from the environment (for example, sunvisors or water splash guards). Such protection should not impair detection capability.

4.9. Communications protoco l

5. Flame detection

5.1. Type

Flame detectors should be closed circuit television (CCTV), infrared (IR), or ultraviolet (UV).

5.2. Sensitivity

For general use, equipment should detect a fire of 10 kW radiant heat output (RHO) at 10 m

(33 ft).

5.3. Response time

Response time shall be less than 10 seconds.

5.4. Alignment

a. Detectors shall allow easy horizontal and vertical adjustment of ±π/4 radians (45 degrees).

b. Detectors shall lock in the desired position.

5.5. Diagnostics

System shall contain diagnostics for checking that the detector is online.

5.6. Output

a. Detectors or interface units shall have volt-free relay contacts for:

1. Alarm.

2. Fault.

b. Detectors should have serial communication capability (or equivalent) for use withinterrogation tools or connection to smart control equipment.

5.7. Testing

A fire alarm simulation test source that can be used a minimum of 5 m (16 ft) from the detector

should be provided.


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5.8. Field of view

Detectors shall have at least a π/2 radian (90 degree) field of view in the horizontal axis.

5.9. False alarm immuni ty

Solar interference (sunlight), artificial lighting, or regularly modulated black body radiation

shall not cause false alarms.

5.10. CCTV flame detectors

Closed circuit television (CCTV) flame detectors that analyse object motion and behaviour

should be used for detecting hydrocarbon fires.

5.11. Infrared flame detectors

a. Single frequency detectors that respond to infrared radiation equivalent to the CO2 bandshould be used to detect hydrocarbon fires.

b. Detectors that respond to infrared radiation outside the CO2 emission band shall be subjectto X approval.

c. Multiple wavelength detectors shall be subject to X approval.

5.12. Ultraviolet flame detectors

Ultraviolet (UV) flame detectors shall respond to energy radiation wavelengths from

0,18 microns to 0,25 microns.

6. Flammable gas detection

6.1. Type

Flammable gas detectors should be point or open path infrared type.

6.2. Response time

Response time to reach 90% of scale (T90) shall be:

a. Less than 5 seconds for general applications.

b. Less than 2 seconds for HVAC duct applications.

6.3. System faults

a. Detector and supporting electronic equipment shall detect and communicate any failurethat might prevent a response to hydrocarbon gas.

b. Undetected failures in ability to respond correctly to hazards are not acceptable.

6.4. Output

a. Detector should have 0–20 mA current output (sink or source configurable, or option). b. Required output modes are in accordance with the following table:

Current (mA) Signal meaning

0 Common fault

2 Optical fault

4 No gas

20 Full scale deflection

c. Detectors should have serial communication capability (or equivalent) for use withinterrogation tools or connection to smart control equipment.


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6.5. Open path gas detectors

6.5.1. System configuration

a. For open areas, open path gas detectors should be the split transmitter and receiver type.Detectors with combined transmitter/receivers using a reflector panel should not be used.

b. For HVAC duct applications, either split transmitter and receiver type detectors or

combined transmitter/receivers using a reflector panel may be used.

6.5.2. Alignment

a. Transmitters and receivers shall allow easy horizontal and vertical adjustment of±π/4 radians (45 degrees).

b. Transmitters and receivers shall lock in the desired position.

c. The system should be tolerant of misalignment of either or both the transmitter and thereceiver of 4,4E–3 radians (0,25 degrees) without any effect on system operation.

6.5.3. Sensit ivity

a. For general area use, the detector sensitivity range should be 0–5% lower explosive limit

metre (LELm).

b. For HVAC applications, the detector sensitivity range should be 0–100% lower explosivelimit (LEL). Detector calibration should be determined by the width of the duct, or pathlength, whichever is shorter.

6.5.4. Calibration

Detector shall be calibrated so that the flammability of any gas compositions for the area whereit is installed shall not be underestimated.

6.5.5. Diagnostics

System shall contain diagnostics for the following conditions.

a. Improperly installed equipment shall be detected. Detection of either excess path length ormisalignment shall prevent equipment from going operational.

b. After initial setup, significant reduction in signal for more than 60 seconds shallautomatically indicate an optical fault.

c. If system is in optical fault condition, gas shall be detectable without underestimation offlammability.

d. Reduction of signal strength to less than 5% of the initial setup value for more than 1 hourdetector shall indicate a common fault.

6.5.6. False alarm immunity

a. Solar interference (sunlight) shall not cause false alarms.

b. Sunlight shall not cause the detector to be unavailable, even if this condition iscommunicated.

c. Detector shall not produce an alarm indication greater than 0,5 LELm in response to anycombination of obstructions, vibration, or external sources of infrared radiation (including

solar and hydrocarbon flare radiation) in the beam.

d. A test report verifying this performance shall be submitted for X approval.


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6.5.7. Environmental tolerance

a. Fouling of optical surfaces by the common contaminants found in the area of installationshould not cause unwanted alarms.

b. Substantial fouling shall be communicated as an optical fault.

c. Detector should be capable of operating in sea fog densities equivalent to a transmittance

of 0,1 (90% drop in visibility) over 40 metres (130 feet), measured at a nominalwavelength of 0,632 microns.

d. Information on wavelength dependent effect of varying water droplet sizes should be provided.

6.5.8. Testing

a. Optical test filters to test function and accuracy of the detector should be provided.

b. Using calibration gas to test these detectors is unacceptable due to the large volume of gasthat would need to be released into the optical path.

6.6. Point infrared gas detectors

6.6.1. Sensit ivity

The standard sensitivity range of the detector should be 0–100% LEL.

6.6.2. Calibration

a. Detector shall be calibrated so that it will never underestimate the flammability of any gascompositions that it may see in the area it is installed.

b. Detector shall be factory calibrated and should not be recalibrated in the field.

6.6.3. False alarm immunity

a. Detector shall not produce an alarm indication greater than 10% LEL in response to wateror water vapour in the optical path.

b. A test report verifying this performance shall be submitted for X approval.


a. Fouling of optical surfaces by common contaminants found in the area of installation shallnot cause unwanted alarms.


6.6.5. Testing

Optical test filters should be provided to test function and accuracy of the detector. If this is not

available, calibration gas may be used.

7. Toxic gas detection

7.1. Sensitivity

The sensitivity range of the detector should be from zero to no more than twice the time

weighted average (TWA) for the target gas.

7.2. Calibration

Detectors should be supplied with suitable calibration gas for site calibration.


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7.3. False alarm immuni ty

7.4. Environmental tolerance

8. Gas leak detection

8.1. TechnologyGas leak detectors should be based on ultrasonic technology.

8.2. Sensitivity

Detector should have adjustable sensitivity settings from 44 dB to 104 dB.

8.3. Response time

a. Standard response time should be less than 5 seconds.

b. Time delays may be employed to improve false alarm immunity.

c. Maximum time delay shall not exceed 30 seconds.

8.4. Testing

A test source should be provided that can be used at a distance of a minimum of 5 m (16 ft)from the detector for gas leak simulation.

9. Heat detection

9.1. General

Several types of heat detection are available, based on technologies such as bimetallic strips, IR

sensors, thermistors, frangible bulbs, fusible plugs, and pressurised plastic tubes.

9.2. Point detection (electr ical/electronic)

9.2.1. General

a. Point detection detectors should respond to a factory set temperature and incorporate anadditional trip on a high rate of rise in temperature.

b. The detector should be approved for compliance with the recognised test standard (forexample, UL or CSA) in the country of installation.

c. The detector should be self-resetting.

9.2.2. System faults

a. Detector and supporting electronic equipment shall include functions to detect andcommunicate any condition that might prevent fire detection.

b. Undetected failures in availability to respond correctly to hazard are not acceptable.

9.2.3. Outputs

a. Detector shall be one of the following:

1. Addressable

2. A simple current change detector that produces an increase in circuit current when itdetects heat.

b. System shall be capable of indicating the following four circuit conditions:


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1. Short circuit fault.

2. Quiescent.

3. Alarm.

4. Open circuit fault.

9.2.4. TestingA heat source to test the detector should be provided.

9.3. Point detection (pneumatic)

a. If firewater deluge valves must be directly controlled, frangible bulb or fusible plug pneumatic heat detection systems may be used.

b. These detectors can also be used without a deluge valve as a “detection only” system,where the electrical signal is used to raise alarms and cause control actions.

c. These detectors should use a pressure transmitter (rather than a pressure switch) for alarmand fault indication.

9.4. Linear detectionLinear detectors should be used to supplement other forms of detection in difficult areas (forexample, a heavily congested plant or where flare radiation may be visible).

9.4.1. Pneumatic tube systems

Pneumatic tube systems should be used in preference to frangible bulbs or fusible plugs where

detection of fires below 100 kW RHO is required. These systems should be configured in thesame manner as pneumatic point heat detection systems.

9.4.2. Electrical linear heat detectors

a. Electrical linear heat detectors come in two types:

1. Detectors that respond to an average temperature along their length.

2. Detectors that respond to the highest temperature at any point along their length.

b. Detectors should be self resetting.

c. Detectors should have control equipment with volt-free relay contacts for alarm and faultindication.

9.4.3. Optical linear heat detectors

Optical linear heat detectors should use a property of a particular type of optical fibre (Rammanscattering) that changes with temperature to monitor the temperature at any point along the

fibre.

Optical linear heat detectors should have control equipment that has volt-free relay contacts for

alarm and fault indication.

10. Oil mist detection

10.1. System configuration

a. Oil mist detection systems are a combination transmitter/receiver using a reflector panel.

b. These detectors can be used for open path smoke detection, and dual function smoke andoil mist detectors.


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10.2. Sensitivity

Alarm sensitivity should be a signal loss of 0,5 dB or greater.

10.3. Response time


10.4. Environmental tolerance

a. Fouling of optical surfaces by the common contaminants found in the area of installationshould not cause unwanted alarms.


10.5. System faults

a. The detector and supporting electronic equipment shall include functions to detect andcommunicate any condition that might prevent a response to oil mist in the optical path.


10.6. Output

a. Detector or its interface unit should have volt-free relay contacts for:

1. Alarm.

2. System fault.

3. Optical fault.

b. A serial communication (or equivalent) output for use with smart control equipment is preferable to a simple relay output interface.

10.7. Testing

Optical test filters should be provided to test the function and accuracy of the detector.

11. Smoke detection

Smoke detectors should be ionisation or optical type. Optical detectors should be photoelectric,

open path infrared beam, or laser based aspirating.

11.1. Aspirating

11.1.1. System conf iguration

The system should be a single unit containing a fan, laser based detector, and control/display

card that is connected to a piping distribution network that covers the protected space.

11.1.2. Sensitivi ty and response time

Detector should be calibrated for the specific application. Calibration should ensure that

detector achieves full scale deflection (FSD) in the required time.


a. Detector and supporting electronic equipment shall include functions to detect andcommunicate any condition that might prevent smoke detection.

b. Undetected failures in availability to respond correctly to the hazard are not acceptable.


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11.1.4. Output

a. Detector should have at least 3 volt-free changeover relay contacts, two used for presetsmoke concentration thresholds, and one for fault.

b. Detector should have serial communication (or equivalent) capability for use withinterrogation tools or connection to smart control equipment.

11.1.5. Diagnostics

The system shall contain diagnostics to detect changes in air flow a maximum of ±10% from the

commissioned value that could arise due to broken or blocked pipework.

11.1.6. Testing

A burned wire test kit should be provided to test the function of the system for compliance with

the performance requirements.

11.2. Point detectors

11.2.1. Ionisation

Ionisation smoke detector should have a dual chamber design for sensing both visible andinvisible combustion products.

11.2.2. Photoelectric

Photoelectric detectors shall operate on the light scattering principle and shall have a sensingchamber that allows smoke entry while minimising light entry.

11.2.3. HVAC duct mount ing

For mounting in HVAC ducts, the detector shall be installed outside the duct with sampling

tubes drawing a sample from the air being monitored.

11.2.4. Approval

The detector should be approved for compliance with the recognised test standard (for example,

UL or CSA) in the country of installation.


a. The detector and supporting electronic equipment shall include functions to detect andcommunicate any condition that might prevent smoke detection.


11.2.6. Output

a. Detector shall be one of the following:

1. Addressable

2. A simple current change detector that produces an increase in circuit current when itdetects smoke.

b. System shall be capable of indicating the following four circuit conditions:

1. Short circuit fault.

2. Quiescent.

3. Alarm.

4. Open circuit fault.


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c. Each detector should have an LED to indicate when the detector is in alarm.

11.2.7. Testing

Smoke detector test aerosol should be provided to test the function of the detector.

11.3. Open path

11.3.1. System conf iguration

Open path systems should have a combined transmitter/receiver using a reflector panel.

11.3.2. Sensitivity

Alarm sensitivity should be a signal loss of 0,5 dB or greater.

11.3.3. Response time



a. Fouling of optical surfaces by the common contaminants found in the area of installation

should not cause unwanted alarms.



a. Detector and supporting electronic equipment shall include functions to detect andcommunicate any condition that might prevent a response to smoke in the optical path.


11.3.6. Output

a. The detector or its interface unit should have volt-free relay contacts for:

1. Alarm.

2. System fault.

3. Optical fault.

b. A serial communication (or equivalent) output for use with smart control equipment is preferable to a simple relay output interface.

11.3.7. Testing

Optical test filters should be provided to test the function and accuracy of the detector.

12. Manual fire alarm stations

a. Manual fire alarm stations shall have one set of volt-free changeover contacts. b. The contacts shall have a minimum rating of 1A at 24 Vdc.

c. Manual fire alarm stations may be of the break glass, lift flap and push button, or pullhandle type.


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13. Panel equipment

13.1. Panel archi tecture

a. Panel equipment used for detector interface may be a centralised unit or be a number ofdistributed units communicating to a central control point.

b. The system may use solid state or programmable electronics for system logic. If programmable electronics are used the requirement for redundancy for the necessary safetyintegrity level shall be determined by analysis in accordance with IEC 61508.

13.2. Power supplies

a. Power supply design shall consider the need for redundant supplies and distribution.

b. The level of redundancy shall be determined by analysis in accordance with IEC 61508.

c. Circuit breaker and fuses shall be rated for current surge on equipment powerup as well ascurrent limit.

d. Failure of any circuit breaker or fuse shall automatically be reported as a fault on the F&G panel.

13.3. Operator in terface

13.3.1. General

a. Operator interfaces should be visual display units (VDUs).

b. For small systems (less than 100 I/O circuits) front panel displays may be used for the fire panel and gas control cards only.

c. Hardwired matrix panels may be used as backup to VDU systems, or as the primaryinterface for small systems.

13.3.2. VDU philosophy

VDU based operator interfaces should be based, where feasible, on the Vendor standard.

13.3.3. Area mimics

a. Area mimics should show an overall view of the site.

b. Each area mimic shall be divided into subsections, each corresponding to an expandedmimic.

c. Each subdivision of the area mimic shall define the presence of an alarm, fault, orinhibit/override condition.

d. No individual detectors shall be shown on area mimics.

e. An alarm or fault condition shall be automatically displayed on the correct subdivision ofthe area mimic in alarm, and simultaneously give an audible warning that can be silenced by the operator.

13.3.4. Expanded mimics

a. Each expanded display shall show a detailed part of an area mimic display, including moretext information (where space permits), and a reference to the presence of an active fire or

explosion protection system where relevant.

b. Each individual detector and MAC shall be shown in its approximate location.

c. Fire areas where nonaddressable fire circuits are installed shall show one indication per firearea of smoke, heat, flame, and manual alarm call point.


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d. In large fire areas, this indication may need to be subdivided.

e. The same rules as the area mimic regarding colour convention and other features apply tothese expanded displays.

13.3.5. Alarm banner area

An area of each area mimic and expanded mimic shall be used as an alarm banner indicating the

first up unacknowledged fault or alarm.

13.3.6. Trending pages

a. Trending page displays should show the value of analogue parameters within individualdetectors.

b. It should be possible to set trend rate and duration for a minimum of 10 values.

c. The trend resolution should be adjustable to one second sample intervals.

d. If trending pages are used, all analogue values fed into the system should be available fortrending.

13.3.7. System output

System output displays should show the state of all system outputs as either activated or not

activated.

13.3.8. Inhibit s and overrides

a. The system shall have facilities for applying inhibits to detectors and overrides to outputdevices.

b. The application of an inhibit should prevent the inhibited detector from automaticallygenerating control actions but should not prevent audible and visual alarms at the control

point.

c. The application of an override should prevent the overridden output from being activatedfrom the F&G system until the override is removed.

13.3.9. Fire pump and ring main display

If a site has fire pumps, a separate mimic display shall be used for fire pump ring main and fire

pump status.

13.3.10. Alarm lists

a. Standard alarm lists shall be available on a rolling alarm principle, detailing tag number,alarm type, location, and time.

b. Each line shall be tagged, and shall indicate the time of occurrence.

c. Alarm text shall be shown red flashing until accepted, changing to nonflashing.

d. Fault text shall be shown yellow flashing until accepted, changing to nonflashing.

e. Inhibit and override text shall be shown cyan nonflashing.

f. Status text shall be shown in white with the above accept facilities.

g. There shall be two alarm listings:

1. One “current” showing fire, gas, manual call point, and fault.

2. A second alarm listing shall be available for historical records and may be sorted fordisplay on either a device basis or a time period basis via the directory.

h. The historical alarm listing shall be capable of listing all events and operator actions.


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i. Storage capacity shall hold on file at least the last 10,000 events.

13.3.11. Printer facilit ies

a. Alarms received into the system shall be available for printing on demand.

b. Each entry shall have a full line identical to the historical alarm listing display.

13.3.12. Alarm handling

a. For both area and expanded mimics, sensor symbols that are not in alarm shall bedisplayed green or white.

b. If a sensor goes into alarm, status indication at base of display area shall start flashing, redfor alarms and yellow for faults, and the audible alarm shall sound.

c. The first alarm condition shall automatically display the correct area mimic, with a redflashing fire, manual call point, or gas symbol, in the area where the alarm has occurred.

d. First alarms shall be individually acknowledged from the expanded mimic display, wherethe flashing symbol identifier will go steady and continue to stay red until the relevant

detectors are reset.

e. After any alarm condition, display selection of the correct area mimic shall be made bydirect select button or by another fast access field facility.

f. It shall not be possible to reset unacknowledged alarms.

g. Global acknowledge and reset facilities should only be available on pages where all theindications that will be affected by their action are displayed.

13.3.13. Page access

Page hierarchy shall be arranged so that any page can be displayed in no more than two

commands.

13.3.14. Previous/next paging

Special keys shall enable access to one display forward or back in the display hierarchy, up to

the last 10 pages displayed.

13.4. Other system interfaces

13.4.1. General

a. The F&G system may be required to interface with several systems (for example, ESD,HVAC, fire protection, fire pumps, and public address).

b. The interface between the F&G system and other systems shall be hardwired discretecircuits for each control action.

13.4.2. ESD interface

a. Output relays should be provided in the Fire and Gas system to interface with theemergency shutdown (ESD) system where automatic shutdown actions have beenspecified.

b. A single relay should be provided for ESD, ESD with blowdown, and each individual process unit shutdown where required.

c. These relays should be normally deenerxed with volt-free closed contacts, opening for acontrol action command.


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d. The output circuit including the relay coil should be monitored for all fault conditions thatcould prevent the relay coil being enerxed on demand (for example, open circuit or shortcircuit).

13.4.3. HVAC

a. Output relays should be provided in the F&G system to interface with the HVAC system to

initiate the starting and stopping of fans and opening and closing of dampers. b. A single relay should be provided for each control action.

c. These relays should be normally deenerxed with volt-free closed contacts, opening for acontrol action command.

d. The output circuit including the relay coil should be monitored for all fault conditions thatcould prevent the relay coil being enerxed on demand (for example, open circuit or short

circuit).

13.4.4. Fire protection systems interface

a. Output circuits should be provided in the F&G system to interface with fire protectionsystem actuation solenoids.

b. These circuits shall monitor the field device in the nonenerxed state and its cabling, for allfault conditions that could prevent the solenoid being enerxed on demand (for example,

open circuit or short circuit).

13.4.5. Fire pumps

a. If fire pumps are installed, output circuits should be provided for automatic starting of thefire pumps.

b. Controls, alarms, and status indications should be provided on the F&G system for all fire pumps on a site.

c. Output relays should be provided for all fire pump controls, and at the fire pump controllerfor all inputs to the F&G system.

d. These relays should be normally deenerxed with volt-free closed contacts, opening for acontrol action command.

e. The output circuit including the relay coil should be monitored for all fault conditions thatcould prevent the relay coil being enerxed on demand (for example, open circuit or shortcircuit).

13.4.6. Public address

a. Output relays should be provided in the Fire and Gas system to interface with the publicaddress system to audible and visual alarms on an individual area basis.

b. Each area shall have a single relay.

c. Relays shall be normally deenerxed with volt-free closed contacts, and shall open for a

control action command.

d. The output circuit including the relay coil should be monitored for all fault conditions thatcould prevent the relay coil being enerxed on demand (for example, open circuit or short

circuit).

13.4.7. Other systems

a. Controls, alarms, and status indications should be provided on the F&G system forstandalone packages.

b. Output relays should be provided:


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1. In the F&G system for all control actions.

2. At the local control panel for all inputs to the F&G system.

c. Output relays shall be normally deenerxed with volt-free closed contacts, and shall openfor a control action command.

d. The output circuit including the relay coil should be monitored for all fault conditions that

could prevent the relay being enerxed on demand (for example, open circuit or shortcircuit).

e. Use of standalone F&G panels separate from the main F&G system is discouraged. Iffeasible all F&G detectors should be connected directly to the main F&G system.

14. Certif ication inspection and testing

14.1. Certification and inspection

Certification and inspection records shall be provided as defined by X or their representative on

the purchase order. These records may include:

a. Hazardous area certificates.

b. Test and inspection records.

c. Calibration certificates.

d. Third party approvals (for example, fire marshal approval for fire detection service).

e. EMC compliance.

f. Any document required to demonstrate compliance with local lexlation.

14.2. Factory acceptance test

a. A factory acceptance test (FAT) shall be performed to demonstrate that the equipment performs as specified, including any site specific configuration.

b. For practical reasons, simulators may be used to simulate field detectors.

c. Simulators shall be limited to simulating no more than 90% of the detectors.

d. The remainder of the test shall use the actual field equipment.

e. FAT will be performed against a procedure, provided by Vendor, and subject to Xapproval.

f. Test results shall be accurately recorded, including any simulators used and any ad hoctests that were performed.

14.3. Site acceptance test

a. A site acceptance test (SAT) shall be performed to demonstrate that the installedequipment performs as specified including any site-specific configuration.

b. SAT will be performed against a procedure, provided by the supplier, subject to Xapproval.

c. Test results shall be accurately recorded, including any ad hoc tests that were performed.

15. Documentation

a. Manuals and other information required for design, operation, and maintenance of thesupplied equipment, including any necessary accessories, shall be provided.


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b. The following topics shall be included, together with any information required on thespecification sheet for the detector:

1. Detector specification and functional description.

2. Detector performance.

3. MTBF calculations (including accessories if supplied).

4. System design application notes.

5. Installation and commissioning procedures.

6. Test and maintenance procedures.

7. Spares and accessory lists.

8. Operating and maintenance manuals.


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Guidancefor Fire and Gas Detection

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