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

2.6.1 GENERAL
SECTION 2.6
STATION SMOKE CONTROL AND
MECHANICAL VENTILATION SYSTEMS
2.6.1.1 Fans forming part of a fire rated duct shall also be enclosed in
the same fire rated enclosure.
2.6.1.2 Ductwork not serving smoke control fan rooms shall not pass
through the smoke control fan rooms.
2.6.1.3 PVC pipes are prohibited in underground stations, except PVC
pipe sleeves and condensate drain pipes for air-conditioning
units as stipulated in Cl.2.3.15.11 of this Standard.
2.6.1.4 Fresh/exhaust air of the station’s smoke control and
mechanical ventilation systems can be taken from/discharge to
the intake/exhaust air shafts (shown shaded in Diagrams
2.6.1.4(a) and 2.6.1.4(b)) respectively of the underground
station.
2.6.1.5 The intake and exhaust air shafts shall be positioned or
protected to prevent re-circulation of smoke into the system
through air intake openings, station entrances and other surface
openings. Adjacent structures and property uses also shall be
considered.
2.6.1.6 Primary and secondary power supply shall comply with
Cl.4.1.3 of this Standard.
2.6.1.7 Where replacement air is taken from doorways at station
entrances, devices or other measures shall be incorporated to
admit replacement air upon activation of the emergency
ventilation system to achieve the design requirements during
operating hours and non-operating hours when the station is
closed for passenger service.
2.6.2 AIR-CONDITIONING & MECHANICAL
VENTILATION SYSTEMS
2.6.2.1 Where air-conditioning system is provided in lieu of
mechanical ventilation system during emergency, all the
requirements specified in this Standard for the mechanical
ventilation system shall apply to the air-conditioning system.
Smoke control
fan rooms
PVC pipes
Air shafts
Re-circulation
of smoke
Power supply
Standard for Fire Safety in Rapid Transit Systems 110