On 01/22/2013 06:59 PM, Rohan McLeod wrote:
Steve Roylance wrote:
On 01/22/2013 04:57 PM, Russell Coker wrote:
On Tue, 22 Jan 2013, Tony Langdon <vk3jed@gmail.com> wrote:
I can only comment on the system I know, which is the protection system used on a typical tanker (a lot smaller area to protect than a house!). For that space, the water usage is 150 litres/minute, and additional passive shielding is added, such as the vehicle body and reflective curtains for the windows, as well as individual protective clothing. an Australian Standard fire hydrant is to supply for 300 litres/minute at 700kPa and should be supplied from a system 4 hours supply with positive feed. Please correct me if I am reading this incorrectly; street fire hydrants are intended to supply 300 litres/ minute at a pressure of 700kPa ? presumably with a much higher pressure with no flow ? Further the supply to such a hydrant must be sufficient in volume, for 4 hours flow at this rate ; that is 720,000 litres or 720 m^3 ?; where an Olympic swimming pool say contains 50 x 25 x 1 m^3 = 1250 m^3 ?
AS-2419 which I am quoting is about in building hydrants, and AS-2118 for sprinklers. this is about right, if the mains cannot supply the pressure then a booster pump is needed and if it cannot do the volume then a tank is needed. Cannot get exact clause quotes as all is behind a paywall, even as they are required by govt. regulations. Steve