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

2.3.9.3 Pipes
(a) Pipes which pass through a separating wall,
compartment wall or compartment floor shall be kept
as small as possible and fire-stopped around the pipe.
The nominal internal diameter of the pipe shall be not
more than the relevant dimension given in Table
2.3.9A with the exception of pipes having the
necessary fire resistance when tested to BS 476: Part
20 or other acceptable standards. Clear spacing
between pipes shall be minimum 50mm or ½-diameter
of the largest pipe, whichever is the larger.
Exception: Emergency standby diesel generator steel
exhaust pipes connected directly to the external.
(b) In additional to sub-clause (a), fuel and vent pipes for
emergency standby diesel generators and fuel tanks
located outside the room they served shall be enclosed
in construction having fire resistance of not less than 2
hours. They shall not be located in intake/fresh air vent
shaft.
2.3.9.4 Ventilation duct which passes directly through a
compartment wall or compartment floor shall comply with
the following -
(a) Where the ventilation duct does not form a protected
shaft or is not contained within a protecting structure,
(i) The duct shall be fitted with a fire damper where
it passes through the compartment wall or
compartment floor, and
(ii) The opening for the duct shall be kept as small as
practicable and any gap around the fire damper
shall be fire-stopped.
(b) Where the ventilation duct forms a protected shaft or is
contained within a protecting structure, the duct shall
be:
(i) Fitted with fire dampers at the inlets to the shaft
and outlets from it, and
(ii) Constructed and lined with materials in
accordance with the requirements in Section 2.6.
(c) The installation of ventilation ducts and fire dampers
shall comply with the requirements in Section 2.6.
Pipes
Ventilation
ducts
Standard for Fire Safety in Rapid Transit Systems 68