Standard for Fire Safety in Rapid Transit Systems - Singapore Civil ...

2.6.5
(ix) The exhaust fan shall be capable of operating
effectively at 250ºC for 2 hours and supplied
from a secondary source of supply.
(x) Replacement air shall be provided and if it is
supplied by a separate mechanical system, such a
system shall be connected to a secondary source
of power.
(d) The smoke purging system need not be a dedicated
system. Where dampers are used to direct the smoke
for the smoke purging system, motorised smoke
dampers shall be used.
(e) Shops as permitted in Cl. 2.1.3 are not required to be
provided with smoke control system.
(f) Public area outside the commercial space shall be
provided with smoke purging system as shown in
Diagram 2.6.4.1(f).
(g) The smoke purging system in the station public area
shall be automatically activated by detectors located in
the station public areas. Similarly the smoke purging
system in a non-public area shall be activated by the
fire alarm signals from that particular non-public area.
UNDERGROUND AND ENCLOSED STATION
TRAINWAY EMERGENCY VENTILATION SYSTEM
2.6.5.1 An emergency ventilation system shall be designed for a train
fire in an underground and enclosed stations trainway as
follows:
(a) Provide a tenable environment along the path of egress
from the fire incident.
(b) Be capable of reaching full operational status in 120
seconds or less.
(c) The emergency ventilation fans shall be provided such
that in the event one of the fans is not operational, the
other fan(s) shall be capable of maintaining the system
design.
(d) The replacement air velocity against the direction of
escape at doorways and escape routes shall not exceed
5m/s
Shops
Replacement
air
Standard for Fire Safety in Rapid Transit Systems 115