Singapore Fire Safety Engineering Guidelines 2015_1.pdf

Detection refer to section 41 notification time refer

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Detection Refer to Section 4.1. Notification time Refer to Section 4.2 Pre- movement Refer to Section 4.3. Movement Refer to Section 4.4.
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59 Table 9.12 Sensitivity Analysis (ASET/RSET ≥ 1.2) Sensitivity study Affects Remarks Natural Ventilation : 1 MW fire ASET (i) Test buoyancy of smoke. (ii)Walls to be inert Natural ventilation: Design fire size is based on base case design fire. ASET 1 side of exhaust vents fail.(Side with most vents) Mechanical ventilation : Design fire size is based on based case design fire. ASET (i)Fan failure (See Section 2.2) or increase fire size by 20% (ii) Walls to be non-adiabatic Increase in fire growth rate ASET E.g. From fast to ultrafast Delay in detection RSET Failure of main means of detection 1 exit blocked (or more) RSET The number of exits blocked depends on closeness of the exits Extended pre-movement time RSET Value to be doubled 9.1.3 Example 3 Internal discharge of exit staircase not compliant with clause 2.3.3 (c) of the Fire Code. Internal discharge of exit staircase not compliant with clause 2.3.3 (c) of the Fire Code (a) Root objectives The root objectives are : (i) R2.1 - Occupants must be able to escape to a safe place, directly or through a protected exit, before untenable conditions are reached during a fire emergency. (ii) R2.2 - Fire-fighters must be provided with adequate means of access for fire fighting and rescue operations within the building. (iii) R7.1 - Maintain tenable conditions for evacuation of occupants and protect them from injury arising
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60 from the effects of fire. (iv) R7.2 - Provide smoke management in the building for firefighting operations. (b) Sub objectives The sub objectives are : (i) S2.9 - Provisions for adequate ventilation for means of escape. (ii) S2.13 - Provisions for adequate time for occupant escape from building. (iii) S2.14 - Provisions for safe movement of people within the means of escape. (iv) S7.1 - Provisions for ventilation for life safety purposes such that in the event of a fire, evacuation routes are maintained :- (1) below thermal threshold for human tenability; and (2) at visibility levels adequate for occupant evacuation; and (3) below toxicity threshold for human tenability for the period of time required for escape. (v) S7.2 - Provisions for ventilation to maintain safe conditions in the means of escape for evacuees for the period of time required for escape.
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61 Table 9.13 Design fires (sprinkler protected) Usage Location Size Remarks Atrium Centre Proposed by FSE Axis-Symmetric plume Shop/unit 5MW (as prescribed by the fire code) or other appropriate fire size as proposed by FSE Spill plume. FSE advised to seek consultation Shopping Centre / Office / Mixed Use Unit/s affecting egress path 5MW (as prescribed by the fire code) or other appropriate fire size as proposed by FSE To determine impact of radiation on escaping occupants All others Area with deviation Proposed by FSE Table 9.14 Fire size proposed by FSE based on DETACT T2, FPETool or Firecalc Usage Growth rate Remarks All others Fast/Ultrafast 2 nd ring sprinkler activation Table 9.15 Tenability Limits Tenability Criteria
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