INTERNATIONAL STANDARD
Part 1:Generalrequirements
Partie 1: Exigences generales
Gaseousfire-extinguishingsystems- Physicalpropertiesandsystem design-
Systemesdextinctiond’ncendieutilisantdesagents gazeuxProprietes physiques et conception des systemes
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Contents
Page
4.1 General. 64.2 Extinguishants. 64.2.2 4.2.1 Environmental properties. General. 6 74.3 4.4 Electrostatic discharge Compatibility with other extinguishants. 7 74.5 Temperaturelimitations. 7
Hazard to personnel5.1 5.2 Safety precautions. 8 85.2.1 5.2.2 For normally occupied areas. General. 6 85.2.3 For unoccupiable areas.. For normally unoccupied areas. 105.3 5.2.4 Occupiable areas. 10 105.4 5.5 Electrical hazards. Electrical earthing. 12 115.6 Electrostatic discharge 12
System design. General. 126.1 6.2 Extinguishant supply. 126.2.1 6.2.2 Quality Quantity 12 126.2.3 6.2.4 Container arrangement. Storage container.. 126.3 Distribution. 13 146.3.1 6.3.2 Piping- General. 15 146.3.3 Pipe and valve support.. Fittings. 156.3.4 6.3.5 Valves.. 15 166.3.6 6.3.7 Pressure reducing orifice assembly Nozzles. 16 176.4 Detection actuation and control systems. 176.4.1 6.4.2 Automatic detection. General. 17 176.4.3 6.4.4 Control equipment. Operating devices. 18 186.4.5 Operating alarms and indicators. 196.4.6 Hold switches. 19
Extinguishant system design. 19
7.1 General. 197.2 Specifications plans and approvals. 7.2.1 Specifications. 19 197.2.2 System flow calculations. Working documents. 197.3 20
7.3.1 7.3.2 General A balanced and unbalanced system. 20 207.3.3 7.3.4 Pressure drop.. Friction losses. 217.3.5 Elevation changes. 21 227.3.7 7.3.6 Valves and fittings. Piping length. 22 227.3.9 7.3.8 Drawings. Liquefied gases 227.4 Enclosures. Specific requirements. 22 227.5 7.6 Effects of noise. Extinguishant concentration requirements. 22 237.6.1 Flame extinguishment. 237.7 Total flooding quantity 7.6.2 Inerting 24 257.7.1 7.7.2 General Liquefied gases. 25 257.7.3 Altitude adjustment. Non-liquefied gas. 257.8 7.9 Duration of protection. 26 267.10 7.10.1 System performance. Discharge time. 27 277.10.2 Extended discharge. 278 Commissioning and acceptance. .278.1 8.2 General. Tests. 27 278.2.1 8.2.2 Enclosure check. General. 27 278.2.3 Review of mechanical ponents. Review of enclosure integrity. 29 288.2.4 8.2.5 Review of electrical ponents. 298.2.6 8.2.7 Preliminary functional tests. System functional operational test. 308.2.8 Remote monitoring operations (if applicable). Control panel primary power source. 318.2.9 8.2.10 Completion of functional tests. 31 318.3 Completion certificate and documentation. 316 Inspection maintenance testing and training 9.1 General 31 319.2 9.2.1 Inspection. General 32 329.2.2 Container.. 329.2.3 9.2.4 Hose. Enclosures. 32 329.3 Maintenance. General.9.3.1 9.3.2 User's programme of inspection.9.4 9.3.3 Training Service schedule. 33Annex A (normative) Working documents. .34Annex B (normative) Determination of flame-extinguishing concentration of gaseousextinguishants by the cupburner method. 36Annex C (normative) Fire extinguishment/area coverage fire test procedure for engineered and pre-engineered extinguishing units. 42Annex D (informative) Method of evaluating inerting concentration of a fire extinguishant. .71
Annex E (normative) Door fan test for determining of minimum hold time. 74Annex F (informative) System performance verification. Annex G(normative) Safe personnel exposure guidelines. 90 91Annex H (informative) Flow calculation implementation method and flow calculationverification and testing for approvals. 99Annex I informative) Scaling factors for Class B fuels other than heptane 501Annex J (normative) Criteria for assessment of new extinguishants for inclusion in the ISo 14520 series. 104Bibliography. 106
