AS 1670 1 1995 amdt 4 2001 fire detection, warning, control

Title AS 1670.1-1995/Amdt 4-2001 Fire detection, warning, control and intercom systems System design, installation and commissioning - Fire Licensee Licensed to LUU MINH LUAN on 25 Feb 2002 Conditions of use This is a licensed electronic copy of a document where copyright is owned or managed by Standards Australia International Your licence is a single user licence and the document may not be stored, transferred or otherwise distributed on a network You may also make one paper copy of this document if required Web Check-up AS 1670.1/Amdt 4/2001-11-09 STANDARDS AUSTRALIA Amendment No to AS 1670.1—1995 Fire detection, warning, control and intercom systems— System design, installation and commissioning Part 1: Fire REVISED TEXT The 1995 edition of AS 1670.1 is amended as follows; the amendments should be inserted in the appropriate places SUMMARY: This Amendment applies to the Clauses 6.2.1, 8.4.7(New) and Appendices B and E Licensed to LUU MINH LUAN on 25 Feb 2002 Single user licence only Storage, distribution or use on network prohibited Published on November 2001 AMDT No NOV 2001 Page 25 Clause 6.2.1 Add the following after the first paragraph: For the purpose of this Standard, CO point type fire detectors, complying with the requirements of AS 1603.2, shall be installed in accordance with the requirements for point type smoke detectors (see also Appendix B) NOTE: See Appendix B for guidance for the selection of smoke detectors Add the following new paragraph to the end of existing NOTE: Other Standards or Codes may mandate the use of specific types of smoke detectors for specific application Direct substitution of another type may not be permitted AMDT No NOV 2001 Page 37 New Clause 8.4.7 Add new Clause 8.4.7 as follows: 8.4.7 CO labelling Where CO detectors are installed, a clearly visible label shall be provided on or immediately adjacent to the FIP/SIP Lettering height shall be a minimum of mm and in a contrasting colour The label shall contain the following: (a) Note CO fire detectors installed (b) In case of alarm, check area thoroughly If no fire is apparent check adjacent areas (c) Special maintenance requirements may apply Test and Service detectors in strict accordance with the manufacturer’s specification ISBN 7337 4197 AMDT No NOV 2001 Page 49 Appendix B, Paragraph B2 First paragraph, second line, delete the phrase ‘three characteristics of a fire, i.e heat, smoke, or flame,’ and replace with ‘four characteristics of a fire, i.e heat, smoke, carbon monoxide (CO), or flame.’ Delete third paragraph and replace with the following: Licensed to LUU MINH LUAN on 25 Feb 2002 Single user licence only Storage, distribution or use on network prohibited Typical areas where special consideration should be given together with suggested protection devices are: AMDT No NOV 2001 (a) Sleeping areas — smoke or CO (b) Laundry/bathrooms — heat type B or CO (c) Kitchens — heat or CO (d) Kitchen exhaust duct — heat type E (e) Electrical risers — smoke (f) Autoclave/sterilizer areas — heat type B or D or CO (g) Roof spaces — heat type C (h) Concealed spaces — heat type A (i) Coldrooms/freezers — heat type B (j) Flammable liquid stores — heat type A, smoke, flame (k) Car parks — heat type A (l) Air ducts — smoke (m) Fume cupboards — heat type E (n) Vertical service shaft — smoke or CO (o) Spray painting booths — heat and flame (p) Boiler room/furnace — heat type D (q) Stables — heat or CO (r) Stages, discotheques or rides (where theatrical smoke is used) — CO (s) High ceilings — smoke or CO Page 52 Clause B4.2.2 Delete the Clause AMDT No NOV 2001 Page 56 Appendix B, Paragraph B6 (new) Add the following after Paragraph B5.5: B6 CO FIRE DETECTORS B6.1 General For the purpose of this Appendix, the guidance and applications given apply to CO fire detectors complying with the requirements of AS 1603.2 The CO fire detector’s sensor may have a limited service life because, as the sensor ages, it becomes less sensitive Hence, detectors are required to be maintained strictly in accordance with AS 1851 and any additional requirements of the manufacturer B6.2 Application B6.2.1 General CO fire detectors are suitable for a broad range of fire detection applications These detectors may be better suited to applications where certain other smoke detection techniques are prone to false alarms; e.g dust, steam and cooking vapours Licensed to LUU MINH LUAN on 25 Feb 2002 Single user licence only Storage, distribution or use on network prohibited CO detectors react promptly to slow smouldering fires involving carbonaceous materials Carbon monoxide does not solely depend on convection but also moves by diffusion Carbon monoxide may not be suitable for fires involving: (a) Clean burning liquids (b) PVC insulated cables (c) Combustible metals (d) Certain self-oxidizing chemicals (e) Non-carbonaceous fuels B6.2.2 Location considerations CO detectors should not be used for some types of life protection applications, such as on escape routes, where smoke detectors are used to trigger an alarm during a fire before smoke levels on the escape routes make them unusable In some circumstances, CO fire detectors may be slower to respond A combination of the two detection types may provide some advantage depending upon the findings of the risk assessment B6.2.3 Airflow Air movement does not significantly affect the CO fire detector’s response Whilst CO gas has greater mobility than smoke, it can be diluted by forced ventilation systems and, hence, the same considerations as for smoke detectors should be taken into account Recirculating systems confined to a single room have little effect on dilution, as this is similar to the natural diffusion of the CO gas B6.2.4 Ducts CO fire detectors are not considered suitable for use with duct sampling units B6.2.5 Special considerations Installations that include CO detectors require labelling at the FIP/SIP (see Clause 8.4.7) The location of CO fire detectors should take into account areas where false operation or non-operation is likely Some typical locations where the use of CO fire detectors should be carefully evaluated are as follows: Licensed to LUU MINH LUAN on 25 Feb 2002 Single user licence only Storage, distribution or use on network prohibited AMDT No NOV 2001 (a) Areas where CO may be present from exhausts and normal manufacturing processes Examples include car parks, car park return air plenums, loading docks (b) Generally, cigarette smoke will not have sufficient CO present to cause alarms even though smoke may be clearly visible In heavy smoking and incense burning areas, the CO level should be measured before installing CO fire detectors (c) Where the environment has a high level of film-forming mists, such as silicone sprays, which may block the diffusion barrier Page 62 Appendix E In the second line of the footnote referencing add ‘CO = carbon monoxide.’ .. .AS 1670.1 /Amdt 4/2001-11-09 STANDARDS AUSTRALIA Amendment No to AS 1670.1—1995 Fire detection, warning, control and intercom systems— System design, installation and commissioning Part 1: Fire. .. in a contrasting colour The label shall contain the following: (a) Note CO fire detectors installed (b) In case of alarm, check area thoroughly If no fire is apparent check adjacent areas (c) Special... smoking and incense burning areas, the CO level should be measured before installing CO fire detectors (c) Where the environment has a high level of film-forming mists, such as silicone sprays, which