nightjar wrote in
:

On 04/10/2020 12:15, JohnP wrote:
A school has just gone up in flames in my area. Usual photos of it
burning inside whilst water is put on the outside. Usual cries for
sprinklers - but these can be vandalised and could cause problems.

I know about dry risers - usually to Landing Hose Unions - but what
about a simple array of pipes in the roof space with open nozzles. In
the event of a fire then the Fire Engine hooks up and dowses the fire
from the inside using the fixed nozzles - no need to enter the
building. Notre Dame would have possibly been saved if such a simple
system was in place.

Any thoughts? It seems a compromise to a full sprinkler system but
has the advantage of not being automatic and able to flood the
building.


Unlike a sprinkler system, which releases water only in the vicinity
of the fire, that would release water throughout the building. Fine if
the whole building is on fire, but it could result in unnecessary
water damage if the fire were only localised.

There are dry sprinkler systems. They contain compressed air or
nitrogen, but they still need a detector head to activate. That
releases the gas which, in turn, activates a valve that allows water
to enter the system.


Good point - Perhaps with Zones - selected by the fire brigade.