Todd:
Closed heads operate individually.
Assume the hazard is liquid fuelled fire:
1. if closed room, where is oxygen going to come from to support
sustained pool fire over entire area, and
2. if such a fire were supported with oxygen, I think the room
occupants have hotter issues than avoiding the foam.
3. to fill the floor with a spill (but not a pool fire in depth) will
require about 15 gallons.
Would not most room occupants notice something wrong before 15
gallons spilled on the floor.
4. short of a reasonable worse-case scenario, which is fire across
entire room area burning liquid, most other
fires will be less big, and / or slower growing.
5. If the liquid fuel fire occupied only half the floor area, the
time for the leak to occur is shorter. Still, will
not most occupants realize what is happening while 7 gallons of fuel
are spilling onto the floor, and have
time to make a hasty exit before ignition?
6. if the liquid fuel spill is 7 gallon, and it is instantaneous
across half the surface of this 300 sq. ft. room, then
my advice is the hazardous substance was not well confined in a
double wall or dual barrier container.
7 If the room is an anechoic chamber and the combustible is foam,
then there should be signs in the room and
on the entry door to RUN in case of fire.
8. Is it a Ronald McDonald playroom filled with plastic balls
intended for children?
I don't see, however, many scenarios, where the fire will open enough
sprinklers releasing enough foam quick enough
for someone to exit a 300 sq. ft. room before the foam is 6ft high.
Maybe you want to sign the room for life safety hazard.
Maybe you want a visual signal to accompany release (rotating red
strobe)
Maybe a better description of the room (is it an accessible (ADA)
space),
the occupancy,
the intended users,
the travel distance
the foam (is it Hi-X, CAF or Lo-X),
Scot Deal
Excelsior Risk & Fire
gms: + 420 608 318 498
On Tue, Sep 26, 2017 at 2:26 PM, <[email protected]> wrote:
> Since I couldn't find the Foam Forum, I figured I would ask this here. I
> have been asked to design a modification to an existing foam system inside
> a building. I am still trying to get details on occupancy, design, etc.
> There is no one in the room on a regular basis, but there is occasionally.
> My concern (at this point) is that they are asking for 7 sprinklers
> (closed) in a 300 sqft room. Are there any life safety concerns with this?
> I wouldn't want to see someone get trapped in a room filling up with foam.
>
> Todd G Williams, PE
> Fire Protection Design/Consulting
> Stonington, CT
> 860-535-2080 (ofc)
> 860-553-3553 (fax)
> 860-608-4559 (cell)
>
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>
>
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