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Fixed Fire Pump/Intermediate Booster Pump
Fixed fire pump
The fire pump starting control shall be wired through a selector switch for duty and standby pump selection. Should the duty pump electrically or mechanically fail to operate within 15 seconds the standby pump shall be energized to become the duty pump. The motor/engine driving the fixed fire pump shall be rated to give 20% more power in addition to the hydraulic power required for the rated flow of the system.
Fixed fire pumps shall be permanently primed with non-return valves installed at the discharge side of the pumps. Where necessary, non-return valves shall also be installed in other locations to prevent water backflow into the water tank. The status of each fixed fire pump comprising “Power Supply On”, “Pump Running” and“Pump Failed” shall be monitored and displayed at the pump control panel and repeated at the fire control room or to a status panel at the main entrance of the building.
All fixed fire pumps shall be housed in suitable enclosures, preferably brick or concrete, designed solely for occupation by F.S. pumps. Such pump enclosures shall lie clear of any exit or normal communication routes through the premises and shall be clearly marked in English and Chinese characters and suitably locked to prevent unauthorized tampering of the pumps.
Intermediate booster pump
In all buildings where the height between the topmost hydrant and the lowest Fire Service Inlet is in excess of 60 m, the flow and pressure, where necessary, shall be maintained by intermediate booster pumps incorporated in the rising main system. The pressure at any fire hydrant outlet shall in no case exceed 850 kPa. The running pressure at any hydrant outlet when delivering 450 L/min shall be not less than 350 kPa. Intermediate booster pumps shall be duplicated for duty and standby use. One set of intermediate booster pumps (duty and standby) may feed all risers in the same system to supply the required flow and pressure. Should the duty pump failed to operate, the standby pump shall be energized to become the duty pump within 15 seconds.
Two or three pumps of same capacity arranged in parallel using sequential starting may be employed as the duty intermediate booster pumps to achieve the required pressure and flow within 30 seconds. Under this arrangement, only one standby pump is required and shall be arranged in parallel to the above duty pumps. This standby pump shall be identical to a duty pump and capable to come into operation automatically upon failure of any duty pump.
The motor/engine driving the intermediate booster pump shall be rated to give 20% more power in addition to the hydraulic power required for the rated flow of the system. All intermediate booster pumps shall be permanently primed and electrically driven. Once started, the pump must run continuously until stopped manually. Suitable start/stop push buttons together with pump running indicator lights and alarm buzzers shall be provided adjacent to the Fire Service Inlets to enable Fire Service personnel to exercise control of the intermediate booster pumps. For building with tower(s) on podium, such start/stop buttons shall be provided adjacent to the Fire Service Inlet nearest to the staircase serving the tower. Clear indications in English and Chinese characters of at least 5 mm high shall be provided.
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Engineering Ltd All Rights Reserved
Office Address: Room 1, 5/F Tai Shing Industrial Building, 273-279 Un Chau Street, Sham Shui Po, Kowloon
Workshop Address: Rm 4, Block A1, 15/F., Kin Hing Industrial Bldg, 17-23 Shek Kin Street, Kwai Chung
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Update Date: 25-8-2011
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