On 04/10/2020 13:51, Peter Parry wrote:
On Sun, 04 Oct 2020 11:15:14 GMT, 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.

Sprinkler heads which are recessed so flush with the ceiling are
commonly used if there is a problem with idiots smashing the more
common head. when triggered by localised heat the head extends and
emits a water spray. The head sometimes uses a heat initiated wax
motor so no power supply needed.

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.

Being automatic is a considerable advantage, with sprinklers the fire
is usually out or well contained before the fire service arrives.
Flooding a building is generally a really bad idea, the water damage
is often more expensive than the fire damage.



Presumably if the wax stopcock is remote from the sprinkler head it can
switch off once the temperature drops and so minimise damage?