CEA 4001 - Page 40

40
Storage
methods
Maximum permitted storage height
(1)
m
Minimum
design density
Area of
operation
(wet or pre
-
a
ction system
(2)
category I
category II
category III
category IV
mm/min
m²
ST1
free
standing
or block
stacking
5,3
6,5
7,6
4,1
5,0
5,9
6,7
7,5
2,9
3,5
4,1
4,7
5,2
1,6
2,0
2,3
2,7
3,0
7,5
10,0
12,5
15,0
17,5
260
5,7
6,3
6,7
7,2
3,3
3,6
3,8
4,1
4,4
20,0
22,5
25,0
27,5
30,0
300
ST2
post pallets in
single rows
and ST4
Palletised
racks
4,7
5,7
6,8
3,4
4,2
5,0
5,6
6,0
2,2
2,6
3,2
3,7
4,1
1,6
2,0
2,3
2,7
3,0
7,5
10,0
12,5
15,0
17,5
260
4,4
4,7
5,3
5,7
6,0
3,3
3,6
3,8
4,1
4,4
20,0
22,5
25,0
27,5
30,0
300
ST3 post or
box pallets in
multiple rows
and
ST5/ST6 solid
or slatted
shelves
4,7
5,7
3,4
4,2
5,0
2,2
2,6
3,2
1,6
2,0
2,3
2,7
3,0
7,5
10,0
12,5
15,0
17,5
260
NOTE 1: the vertical distance from the floor to the sprinkler deflectors, minus 1m or the highest
value shown in the table, whichever is the lower.
NOTE
2: dry and alternate systems should be avoided on High Hazard storages especially with the
more combustible products
(the higher categories) and the higher storages. Should it
nonetheless be necessary to install a dry or alternate system, the area of operation shall be
increased by 25%.
T
Table 5: Design criteria for HHS with roof or ceiling protection only
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