buradan - Yangın

To keep sprinkler protection relevant and in tune with the needs
of the warehouse operators we run many product development
projects with end user operators. One such project was carried out
as the end user wanted to use his warehouse in a way which was
not allowed under standard sprinkler protection rules
w No limits on the type of goods stored
w 8.5m storage height with no in-rack sprinklers
w Looser limits on the size and shape of pallets
Such requirements cannot be met by standard or ESFR systems
and so new sprinklers and system concepts have to be developed
and tested Fire is not something which can adequately be modelled
on a small scale and scaled up and for now the only way to test if a
protection scheme will work is to run full scale fire tests.
Worst Case Scenario
8.5 m
Figure 29. Worst case scenario
Mattresses
Candles
To ensure an independent review of the project, the client requested
the involvement of a an independent approvals body, in this case
the VdS of Germany worked with the end user and ourselves to
develop the set-up as shown.
To simulate the worst case scenario a mixture of expanded foam
mattresses and candles was used – a very severe fire load made
even worse by the 8.5m storage height.
Test Fail Criteria
The fire test was run in a the Swedish test lab SP and as you
can see it looks like quite a challenge for the sprinklers. Note
that the goods are also wrapped in plastic film which not only
BİLDİRİLER KİTABI TÜYAK
PROCEEDINGS BOOK 2009
adds to the fire load but prevents the sprinkler from pre-wetting
the goods.
Not shown here is the second rack which was installed, one of
the test fail criteria was that if the fire jumped from one rack to the
second then the test was deemed a failure.
Additional Pass Fail Criteria
Additional pass fail criteria were that the fire could not spread
horizontally more than 6 metres and that the ceiling temperature
could not pass 300°C for more than one minute.
This is particularly important as it allows for a less robust steel
structure for the roof.
Protection Scheme
Vertical Barriers
Figure 30. Protection scheme for the test criteria
11 sec : fire surpasses the top of the 2
Figure 31. Photos of the fire progression
nd storage level 31 sec : fire reaches the ceiling 34 sec : simultaneous opening of four first sprinklers
Ignition
2,3 m
3,7 m
5,1 m
6,5 m
The protection scheme we developed consisted of two main
aspects:
w Large orifice sprinklers at the ceiling only; plus
w Non-combustible barriers placed vertically through the structure
at every other flue space
Such a combination of active fire protection (sprinklers) and passive
fire protection (barriers) is quite unique and is at the forefront of
fire protection. By bringing the two aspects together we hoped to
allow the freedom the customer demanded without compromising
the fire protection.
Fire Progression
TÜYAK 2009
12,0 m
9