The attached video shows a DCP Powder system failure on a single-decker bus that then engulfs the bus with the panic of passengers attempting to evacuate the bus.
What if this bus fire happened in a tunnel?
Worldwide there have been dozens of deaths on bus fires, especially double-deckers with passengers trapped upstairs.
With up to 100 passengers onboard double-decker buses and up to 70 passengers on single-decker buses, when selecting a fire system to suppress an engine bay fire, the duration of activation is one of the most critical items under AS5062-2016 for risk assessment. While many systems may pass P Mark certification, in assessing the risk of the evacuation of occupants, buses have the highest risk of loss of life, and therefore extended duration is critical. The Fogmaker Water Mist System is, therefore, the primary choice.
Firestorm Fire Protection has assessed the risk of allowing 40 to 90 seconds discharge duration to safely evacuate passengers as studies have shown 25 to 90 seconds to evacuate buses, and this is without duress, elderly passengers, disabled, or children potentially impacting evacuation.
Other items for consideration is if the fire product can remove oxygen, provide cooling, and cover material. DCP Powder can disrupt this but is prone to reflash, cause corrosion, and also create messy cleanups while possibly restricting vision and impairing other vehicles. Watermist attacks all three sides of the fire triangle with no mess.
Firestorm Fire Protection installs DCP Powder on many mobile machines across Australia. However, it always recommends a foam cooling agent or water mist as DCP offers no cooling properties.
Finally, as electric buses are on their way, the Fogmaker can provide cooling of batteries and suppression that no other product can reach to allow safe evacuation.