Comments on: How many levels above ground can an external fire hydrant serve with a building permit? http://www.buildingregulations.com.au/183/building-permits-fire-hydrants-external Building Regulations, Permits, Codes and the BCA for Architects and Building Designers. Tue, 06 Sep 2016 04:39:54 +0000 http://wordpress.org/?v=2.9.2 hourly 1 By: Paul Verheijden http://www.buildingregulations.com.au/183/building-permits-fire-hydrants-external/comment-page-1#comment-3139 Paul Verheijden Mon, 21 Feb 2011 20:43:51 +0000 http://www.buildingregulations.com.au/?p=183#comment-3139 The above comments concludes that a hydrant system can be designed so that more than 1 level above ground can be covered as long as fire isolated stairs are not provided. This maybe a desirable outcome as the pressure required for an external hydrant is only 200 kPa were an internal is 350 kPa plus the static pressure due to the height of the building. Many town main water supplies are unable to provide the pressure to the internal hydrant and hence will be forced to use a pump at great expense to the developpment. The above comments concludes that a hydrant system can be designed so that more than 1 level above ground can be covered as long as fire isolated stairs are not provided.
This maybe a desirable outcome as the pressure required for an external hydrant is only 200 kPa were an internal is 350 kPa plus the static pressure due to the height of the building. Many town main water supplies are unable to provide the pressure to the internal hydrant and hence will be forced to use a pump at great expense to the developpment.

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