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Connecting Fire Booster pump directly to 100mm Fire service main in lieu of installing a Fire Service tank.

Last Post 11/05/2021 1:53:14 PM by Brendan Guiney. 3 replies.
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Connecting Fire Booster pump directly to 100mm Fire service main in lieu of installing a Fire Service tank.

10-05-2021 02:11 PM
 
nwellham@ctw.nsw.gov.au
by nwellham@ctw.nsw.gov.au
Joined 10-05-2021 01:51 PM
Posts 1
I have had an inquiry to connect a fire booster pump, limitted to 10l/s @ delivery pressure 700kpa, to a fire service main (after the 100mm meter & DCV) sourced from our town water reticulation main, to meet the requirements of AS2419.1-2005.
I have looked at risk relating to:
1. water hammer as a result of shutting down the pump,
2. low pressure as result of pump suction and 3. water discolouration due to high flows during annual testing.
Is there any other undue risks that the proposed hydrant pump for the hydrant system would pose to an existing towns mains infrastructure if directly connected, or is there any other negatives for this inquiry?
Noel

Re: Connecting Fire Booster pump directly to 100mm Fire service main in lieu of installing a Fire Service tank.

11-05-2021 12:24 PM
 
Shoalhaven City Council
by Shoalhaven City Council
Joined 01-01-0001 12:00 AM
Posts 17
Noel,
I posted a similar quiery a few years back on a WSAA forum if you are a WSAA member you should be able to follow the link below. Our concern included negative pressures collapsing the reticulation system. Our position is not to allow connection due to the risks and require the developers to install a break tank as the risks were too high.
https://www.wsaa.asn.au/community/community-practice/civil-assets-community-practice/direct-pumping-water-mains-fire

Re: Connecting Fire Booster pump directly to 100mm Fire service main in lieu of installing a Fire Service tank.

11-05-2021 01:23 PM
 
Riverina Water County Council
by Riverina Water County Council
Joined 01-01-0001 12:00 AM
Posts 23
Hi Noel,
Like Shoalhaven City Council, Riverina Water do not allow this practice for the same reasons previously stated.
Regards, Jason Ip

Re: Connecting Fire Booster pump directly to 100mm Fire service main in lieu of installing a Fire Service tank.

11-05-2021 01:53 PM
 
Brendan Guiney
by Brendan Guiney
Joined 02-08-2019 03:32 PM
Posts 12
The negative pressure is not only the risk of collapsing the system. Negative pressures in the network creates serious risk of backflow, with the potential to draw contamination into the water supply. Negative pressures can cause spring hydrant mushrooms on below ground fire hydrants to open and potentially draw surface water in. This type of situation could potentially compromise drinking water quality. Brendan Guiney | Executive Officer | NSW Water Directorate
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