Singapore Fire Safety Engineering Guidelines 2015_1.pdf

Initiation of the alarm signal shall occur within 90s

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Initiation of the alarm signal shall occur within 90s of water flow at the alarm-initiating device when flow occurs that is equal to or greater than that from a single sprinkler of the smallest orifice size installed in the system. Cl 2.5.11 Alarm verification feature (AVF). Annex D1
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To reduce the effects of transient environmental conditions, which may cause various types of detectors to be activated, an automatic fire alarm system may be provided with an alarm verification feature, subject to the approval of the relevant authority. Such an alarm verification feature, if provided, shall operate in the following manner. Upon activation of a detector in any zone, the fire alarm system shall go into an alarm retard state for a period not exceeding 20s at the control unit. After the expiry of this period, the fire alarm system shall go into an alarm confirmation state for a period not less than 120s and not exceeding 300s. Only when the same detector or another detector within the same zone or panel is activated during this alarm confirmation period, shall the fire alarm system go into full operation. Cl 2.7.2 Detectors. The delay between activation of a heat detector and activation of the general alarm shall not exceed 10s. Annex D2
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Annex E Warning systems (a) Alerting people with warning systems (Source: C/VM2) Where only manual systems are installed, occupants are assumed to be aware of the fire when the ceiling jet has traversed the entire length of the space from a fire at the opposite end of the space. No additional pre-movement time need be included. The time required for the ceiling jet to completely traverse the ceiling can either be determined using CFD modelling or by the following relationship if zone modelling is used. (i) For storage height ≤ 5.0m (ultrafast fire growth): t d = 10 + 2.4L when L ≤ 1.4w, and t d = 10 + w + 1.7L when 1.4w < L ≤ 4w, and For storage height > 5.0m (ultrafast fire growth): t d = 25 + 1.7L when L ≤ 1.4w, and t d = 25 + w + L when 1.4w < L ≤ 4w, where: w = width of space in meters (shortest dimension) L = length of space in meters (longest dimension) Annex E1
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Annex F Pre-movement time (a) In essence, pre-movement time depends primarily upon the design behavioural scenario, the fire safety management level and building complexity. The New Zealand document, i.e. C/VM2 attempts to prescribe the pre-movement times for various building usage groups, occupant alertness, familiarity and proximity to fire origin. However, these pre- movement times obtained from C/VM2 do not take into account the behavioural modifiers (e.g. detection and alarm quality, level of fire safety management and building complexity) in determining pre-movement times. (b) The level of fire safety management can be significant in reducing pre-movement times.
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  • Three '18
  • Dr. Anthony
  • Microelectronics, Active fire protection, Fire protection, Computational fluid dynamics, Heat release rate, FSE

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