Singapore Fire Safety Engineering Guidelines 2015_1.pdf

Radiation at egress path to external radiation 25 kwm

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Radiation at egress path to external Radiation < 2.5 kW/m 2 Smoke layer 2.5m above relevant FFL Visibility > 10m Temperature < 200 o C Smoke layer drops below 2.5m above relevant FFL Temperature < 60 o C Table 9.16 Acceptance Criteria Scenario Base case ≥ 2 Safety Factor (ASET/RSET) Radiation along evacuation route < 2.5 kW/m 2 Sensitivity analysis ≥ 1.2 Safety Factor (ASET/RSET) Perpetual tenability (Base cases) shall be required for health care occupancies and projects as deemed appropriate by SCDF (e.g. of national and cultural importance such as airport, Large-scale indoor gardens, National Art Galleries/Museums, etc.)
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62 Table 9.17 Determining RSET Time for Method 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. Table 9.18 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 non-adiabatic 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
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63 9.1.4 Example 4 Insufficient set back distance from notional boundary. Insufficient set back distance (a) Root objectives The root objectives are : (i) R3.1 - Prevent the untimely collapse of buildings due to the effects of fire that would affect the safe egress of the building occupants. (ii) R3.2 - Prevent spread of fire to adjacent properties due to the effects of a fire in the building. (b) Sub objectives The sub objectives are : (i) S3.7 - Provisions for prevention of spread of fire to adjacent buildings. Table 9.19 Design fires (sprinkler protected) Usage Location Size Remarks N.A. Relevant compartment Proposed by FSE. Could be based on 84 kW/m 2 or 168 kW/m 2 depending on usage May also be based on specific fuel load if it is known. Subject to SCDF’s approval Table 9.20 Acceptance Criteria Scenario Base case (i) Radiation on neighbouring building < 12.6 kW/m 2 and (ii) The radiant heat shall not be more than 12.6kW/m 2 at twice the distance of the notional boundary of the building on fire,
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64 Table 9.21 Sensitivity Analysis Sensitivity study Affects Remarks Increase in fire growth rate (i) Increase fire size by 50%. 9.1.5 Example 5 Omission or Reduction of Fire rating of element of structure. Structural engineer is to carry out structural analysis with thermal input from FSE.
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