Standard for Fire Safety in Rapid Transit Systems - Singapore Civil ...
Standard for Fire Safety in Rapid Transit Systems - Singapore Civil ...
Standard for Fire Safety in Rapid Transit Systems - Singapore Civil ...
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2.6.5.2 The design shall encompass the follow<strong>in</strong>g:<br />
(a) The heat release rate from a vehicle and any other<br />
combustible materials (if permitted) <strong>in</strong> the tra<strong>in</strong>ways<br />
that could contribute to the fire load, subject to the<br />
approval of the relevant authority.<br />
(b) The rate of fire growth.<br />
(c) Station and tra<strong>in</strong>way geometries.<br />
(d) Fans, shafts and devices <strong>for</strong> direct<strong>in</strong>g air.<br />
(e) Predeterm<strong>in</strong>ed procedures <strong>for</strong> <strong>in</strong>itiat<strong>in</strong>g quick response<br />
from the OCC dur<strong>in</strong>g fire.<br />
2.6.5.3 Fans not designed to function dur<strong>in</strong>g fire shall shut down<br />
automatically upon activation of the emergency ventilation<br />
system unless it can be proven that the emergency air flow is<br />
not jeopardised or conflicted with.<br />
2.6.5.4 Emergency ventilation fans, their motors and all related<br />
components exposed to the exhaust airflow shall be capable of<br />
operat<strong>in</strong>g <strong>in</strong> an atmosphere of 250ºC <strong>for</strong> a m<strong>in</strong>imum of 2<br />
hours.<br />
2.6.5.5 Emergency ventilation fan motors shall be designed to achieve<br />
their full operat<strong>in</strong>g speed <strong>in</strong> 30 seconds or less from a stopped<br />
position when started across the l<strong>in</strong>e and <strong>in</strong> 60 seconds or less<br />
<strong>for</strong> variable speed motors<br />
2.6.5.6 Local fan motor starters and related operat<strong>in</strong>g control devices<br />
shall be located as far away from the direct air stream of the<br />
fans. Thermal overload protective devices shall not be used on<br />
motor control of fans used <strong>for</strong> emergency ventilation<br />
2.6.5.7 Operation of the emergency ventilation system shall be<br />
<strong>in</strong>itiated from the Operation Control Centre (OCC). Local<br />
controls, located <strong>in</strong> the Passenger Service Centre (PSC) of the<br />
station, shall be provided and be allowed to control the<br />
emergency ventilation system only when the authority is<br />
delegated from the OCC to the station PSC.<br />
2.6.5.8 When the replacement air is taken through <strong>in</strong>let air ventilators<br />
or doorways, devices shall be <strong>in</strong>corporated to automatically<br />
open such <strong>in</strong>let ventilators and doors to admit replacement air<br />
upon activation of the emergency ventilation system.<br />
Fail-safe<br />
replacement<br />
air<br />
<strong>Standard</strong> <strong>for</strong> <strong>Fire</strong> <strong>Safety</strong> <strong>in</strong> <strong>Rapid</strong> <strong>Transit</strong> <strong>Systems</strong> 116
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