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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2.9.6.8 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 250º C <strong>for</strong> a m<strong>in</strong>imum of 2<br />
hours. The emergency ventilation fans shall be provided such<br />
that <strong>in</strong> the event one of the fans <strong>in</strong> the operat<strong>in</strong>g system is not<br />
operational, the other fan(s) shall be capable of ma<strong>in</strong>ta<strong>in</strong><strong>in</strong>g<br />
the system design.<br />
2.9.6.9 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 />
2.9.6.10 Fans not designed to function dur<strong>in</strong>g fire shall shut down<br />
automatically upon activation of an emergency ventilation<br />
system unless it can be proven that the emergency air flow is<br />
not jeopardised or conflicted with.<br />
2.9.6.11 Cables used <strong>for</strong> wir<strong>in</strong>g the fans and the associated controls<br />
shall comply with Cl.2.1.4.<br />
2.9.6.12 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 />
2.9.6.13 Devices of the emergency ventilation system such as dampers,<br />
louvres, silencers, etc., shall be capable of withstand<strong>in</strong>g the<br />
repetitive and additive piston effect of mov<strong>in</strong>g tra<strong>in</strong>s and<br />
emergency air velocities. Such devices shall be of noncombustible,<br />
fire resistant materials and be protected, to the<br />
greatest extent practical, aga<strong>in</strong>st fire near the <strong>in</strong>cident area.<br />
2.9.6.14 Vent shafts that penetrate the surface and that are used <strong>for</strong><br />
<strong>in</strong>take and discharge <strong>in</strong> fire emergencies shall be designed to<br />
prevent recirculation of smoke <strong>in</strong>to the station and tra<strong>in</strong>way<br />
through air <strong>in</strong>take open<strong>in</strong>gs, station entrances and other surface<br />
open<strong>in</strong>gs.<br />
2.9.7 ACCESS TO UNDERGROUND OR ENCLOSED<br />
TRAINWAY PORTAL<br />
A m<strong>in</strong>imum 1-m wide access stair from the ground level to the<br />
underground or enclosed tra<strong>in</strong>way portal shall be provided. A<br />
gate of m<strong>in</strong>imum 1m width shall be placed as close as possible<br />
to the portal to permit easy access to underground or enclosed<br />
tra<strong>in</strong>way.<br />
Emergency<br />
ventilation<br />
system<br />
control/<br />
operation<br />
Access to<br />
underground<br />
or enclosed<br />
tra<strong>in</strong>way portal<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> 143
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