I was having a discussion with a fire designer today about Dangerous Goods Storage (HSNO) and what Acceptable Solution (C/AS5 or C/AS6) it would fit into for the purposes of the building consent. The building is around 500sqm, 7m high so could fit into C/AS5. The scope of the C docs is silent on the storage of flammables or special hazards other than foam plastics which are excluded from C/AS5. The HSNO certifier via NZBC F3 usually has requirements for bunding for spill containment and a 4 hour concrete bunker. I don’t know what the HSNO certifier would want above this
It is going to have “quite a lot” of Class 3.1b flammables in racks - Class 3.1b is something like isopropyl alcohol or perhaps white spirits.
Some random points -
In the Olden Days, in C/AS1, it would be WF purpose group, as would the current “classified use”. For what it is worth, the old C/AS1 allowed a heat detector alarm (3af).
There is an ENZ practice Note 18 which i suspect is out of date (2010) and doesn’t really help.
Sprinklers with rack stored flammable liquids can be a problem with expensive solutions - I remember seeing a fire test video some years ago of cooking oil(?) in racks - it was most impressive when the sprinkler spray hit it and there was fire floating across the test hall floor and a mushroom cloud above…
What is the consensus of this for the purposes of a fire report and consent to the C clauses - aside from any HSNO requirements?
- the minimum for NZBC requirements (which realistically is what will be built)?
- what it should be if it is not the above?