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Carried out at:

Hong Kong City Bus Workshop
Sha Tin, Kowloon
Hong Kong
January 10th 2000

WITNESSED BY:
Hong Kong City Bus Company
Kowloon Motor Bus Company (KMB)


TEST CONDUCTED BY:

Pyrogen Corporation Sdn. Bhd., Malaysia.
    Public transport buses engine fires pose a potentially serious threat to human lives.  An effective fire suppression system, installed locally, is deemed the best way to prevent the fires from spreading uncontrollably.  Pyrogen’s small canister size was a considered good option as they can be installed at locations hard to access, hence gave the system designer more flexibility in deciding the best configuration for different types of hazard layout.
    In most cases, a fire in a bus engine compartment can be predictably assumed to start from a leaked or burst diesel tube supplying fuel to the engine.  Fire may spread quickly to engulf the whole compartment area due to a combination of splashed diesel fuel and existing layer of heavy oil on the surface of some components.  It is at this stage of intense fire that it need to be contained to prevent it from further spreading to other areas outside the engine compartment.


The Test Setup
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Following the lighting of the test fires and the one minute (60 Second) ‘pre-burn’ time had elapsed, the Pyrogen aerosol generators were discharged via the introduction of an electrical pulse. The test fires were observed to extinguish in 2/3 seconds and the engine cover was opened 2 minutes later, to confirm the fire extinguishment and generator discharge.
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The result showed that the diesel fires were effectively extinguished after the discharge of the aerosol.   The aerosol distribution was observed to be evenly distributed, although huge losses were observed to occur through the bottom of the compartment.  All witnesses present reported that they were impressed by the test and compared very favorably against prior product testing, which was carried out to the same test protocol.

Final detection and extinguishment release designs are yet to be agreed by all parties, but Pyrogen Staff recommend that an automatic linear type detection system be utilized and auto/manual options of Pyrogen Mag unit activation be incorporated. For a full copy of the test report click here



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