Hose Reel Flashcards
1
Q
Description of Hose Reel Systems
A
- A fire-fighting equipment consisting of a length of tubing and fitted with a shut off nozzle.
- Tubing is coiled around a reel & connected to permanent supply of pressurised water.
- Designed for use by ordinary building occupants to deal with small fires, at their early stage of development.
2
Q
Provision of Hose Reel Systems
A
- To be provided on every storey of every building regardless of building height.
- Required to be provided to protect mechanical & electrical plants on a roof level even if it is a non-habitable floor.
3
Q
Hose reel systems are exempted in the following:
A
(a) Purpose Group I buildings.
(b) Non-residential occupancy on the first storey of a mixed commercial-cum-residential building.
(c) Standalone buildings.
4
Q
Requirements of a Hose Reel
System
A
- Hose made of reinforced rubber of 20 mm / 25 mm in diameter.
- Hose length not exceed 30m with a water throw of 6.0m.
- Water supply to most remote hose reel should provide a water throw of at least 10 m in length at a flow rate of at least 0.4 L/s.
- When length of 30m hose reel tubing is in use with a 6 mm nozzle, a minimum running pressure of 2 bar will be required at entry to each reel and similarly for a 4 mm nozzle where a running pressure of 6 bar will be required.
- Minimum pipe diameter is 50 mm & feeds to individual hose reels of at least 25 mm diameter.
5
Q
Siting of Hose reel Systems
A
- To be sited in prominent & accessible locations within a distance of 5m from exit door but not inside exit staircases.
- If got parts of floor space that are beyond the 36m coverage (30m hose path & 6m throw) of hose reel, additional hose reels must be provided at common area or at a distance of not more than 5m from exit access door of a room.
- Hose reels which are located within a room should not be used for covering the areas outside the room.
- Access to hose reels must not be obstructed by parking, loading & unloading of vehicles or by furniture or equipment.
- Hose reel system must be protected from mechanical damage & unauthorised use.
6
Q
Installing Hose reels in Recesses
A
- Preferably be installed in recesses so that they don’t obstruct escape routes
- Recess doors provided for hose reel recesses should be hinged that they can open approximately 180 degrees so that hose can be run out in either direction.
- Doors should not be locked
- If locked, provide with a glass-fronted box that houses key to unlock hose reel cabinet.
- Provide notice giving full operational instructions displayed on or adjacent to the reel, such as ‘Turn on the valve before running out hose’.
7
Q
Hose Reel Booster Pumps
A
- Two hose reel booster pumps to boost water pressure in hose reel systems.
- Electrically driven and must operate automatically.
- Pumps must also be capable of being started/stopped manually.
- Duty hose reel pump will operate when there is a pressure drop in system.
- Duty pump fail, standby pump will operate automatically.
- Both duty & standby pumps must be connected to two different sources of electrical supply, main electrical supply & the emergency power supply.
8
Q
Which two boost pumps use in hose reel
A
duty and stand-by pump
9
Q
Operation of Pressure Switch
A
- When hose reel is about to be put in operation & water is released from its shut-off nozzle, water pressure in main pipe drop.
- Pressure drop registered by pressure switch, which will start duty booster pump.
- Duty booster pump will supply water to hose & nozzle to fight fire.
- After fire has been fought, nozzle will be shut off.
- Water pressure in hose will rise & when system pressure has been restored, pressure switch will activate to switch off pump.
10
Q
If Duty Booster Pump Fails
A
- Water pressure in hose will continue to drop & it will drop to the limit
- Then second pressure switch will start standby booster pump which will then supply water to hose
11
Q
Water Supplies of Hose Reel
A
- Water for hose reels system is drawn from suction tank.
- Water supply to tank supplied automatically from water mains.
- Minimum capacity of tank is 1100 litres.
- Tanks supplying potable water should not be used to supply water for hose reel installations unless arrangements have been made so that requisite reserve of water for the hose reel installation is always preserved.
- Should have no risk of contamination of potable water due to stagnation in tank.
12
Q
Security
A
Main valves controlling water supply to hose reel system should be secured fully opened by a locked strap.
13
Q
Safety
A
- Notice should be displayed at main stop valves reading ‘Fire Hose Reel Main Water Supply’ warning to ppl not to switch off.
- Notice ‘Fire Hose Reel Pump Motor Electrical Supply - Not to be switched off in the event of fire’ should be displayed adjacent to all electrical switches in the power supply to pumps.
14
Q
A
