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

Table 2.3.9A MAXIMUM NOMINAL INTERNAL DIAMETER OF PIPES
Situation Non-combustible
material 1
Structure enclosing a
Protected Shaft which
is not a stairway or
lift shaft
Any other situation
Notes
Pipe material and maximum nominal internal diameter [mm]
150
150
Lead, aluminium or
aluminium alloy, or
uPVC 2
Any other material
Standard for Fire Safety in Rapid Transit Systems 80
100
100 (stack pipe) 3
75 (branch pipe) 3
(1) A non-combustible material (such as cast iron or steel) which if exposed to a
temperature of 800 degrees Celsius will not soften nor fracture to the extent that
flame or gases will pass through the wall of the pipe.
(2) uPVC pipes complying with BS 4514:1983. Use of PVC pipes shall comply with
Cl. 2.3.15.11.
(3) (i) Within toilets, wash rooms or external corridors, maximum diameter of
uPVC pipes may be increased to double the size given in the above table.
(ii) Within areas of fire risk and adjacent to escape routes, uPVC pipes shall
be enclosed by construction having fire resistance of at least one half hour.
(iii) Where the size of uPVC pipes exceeds that specified under this Clause,
approved fire collar shall be fitted at all positions where such pipes pass
through constructions required to act as a barrier to fire.
40
40