GA_6.2 – Revisions_2015
Item No. Provisions Notes

The type of rising main system shall be provided appropriate to the building as follow:

1.1 Dry Rising Mains
 Any floor at habitable height beyond 9M and not exceeding 28M above ground level.
 One basement exceeding 500 square meters in gross floor area.
 One up to Four basement levels below Level of Exit Discharge (LED)
1.2 Wet Rising Mains
 For building having a habitable height exceeding 28M above the ground level
 More than Four basement levels below LED

Separate dry and wet rising main systems in a building may be permitted by QCD.

Number and distribution of rising main shall be as follow:

2.1 All parts of any floor not more than 28M above the ground level is within 38M from a landing valve, the distance to be measured along a route suitable for hose lines, including any distance up or down a stairway.
2.2 One rising main is provided for one or a series of floors higher than 28M above ground, with each rising main serving not more than 930 square meters of any floor and subject to all parts of the floor to be within 38M from a landing valve.

Position of rising mains and associated landing valves shall be located in the following order or priority:

3.1 Within a firefighting lobby
3.2 In a smoke-stop lobby or common lobby in close proximity to the exit staircase.
3.3 Where firefighting lobby, smoke-stop lobby are not provided, each required exit stairway with landing valve.
3.4 Landing valve of the rising main shall be installed between 1M and 1.4M relative to the finish floor level.

Minimum nominal bore of rising main shall be:

4.1 100mm diameter where the rising main does not exceed 28M in habitable height and serving only one landing valve per floor.
4.2 150mm diameter or higher where the rising main is in combination with the fire sprinkler system serving two or more landing valve per floor.

The inlet to the rising main shall be located:

5.1 On an external wall or a boundary of a building and to be within 18M of the adjacent fire appliance access road. Each rising main shall be fitted within a breaching inlet with non-return valve directly at the foot of the same riser stack.
5.2 As close as possible to the rising main they serve with any connecting pipe between the inlet and the vertical run of the rising main kept to a minimum and given a fall towards the drain valve. The total pressure loss of the dry rising main shall not exceed 6bars based on the design of water flow rate. This is correspond with maximum habitable height of 60M
5.3 In a conspicuous position readily visible and accessible to the firefighters.
Breaching Inlet Location
  Figure A
  Figure B
  Figure C
  Figure D