CEA 4001 - Page 39

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39

NOTE:

storage

height,

building

height

and

ceiling

clearance

(the

vertical

distance

between

the

roof

or ceiling

sprinklers

and

the

top

of

the

storage)

are

all

significant

variables

contributing

to

the effectiveness

and

required

design

density

of

sprinkler

protection.

6.2.3 Intermediate level in-rack sprinklers

6.2.3.1

Where

more

than

50

intermediate

level

sprinklers

are

installed

in

the

racks,

roof

or

ceiling

sprinklers

shall

be

installed

with

a

separate

set

of

control

valves.

6.2.3.2

The

design

density

for

the

roof

or

ceiling

sprinklers

shall

be

a

minimum

of

7,5mm/min

over

an

area

of

operation

of

260

m².

If

goods

are

stored

above

the

highest

level

of

intermediate

protection,

the

design criteria

for

the

roof

or

ceiling

sprinklers

shall

be

taken

from

Table

6.

6.2.3.3

It

shall

be

assumed

that

3

heads

are

operating

simultaneously

on

each

level

of

in-rack

sprinklers,

up

to

a

maximum

of

three

levels,

at

the

most

hydraulically

remote

position.

Where

rack

aisles

are

no

less

than

2,4m

in

width

only

one

rack

need

be

assumed

to

be

involved.

Where

rack

aisles

are

less

than

2,4m

but

no less

than

1,2m

in

width,

two

racks

shall

be

assumed

to

be

involved.

Where

rack

aisles

are

less

than

1,2m

in width,

three

racks

shall

be

assumed

to

be

involved.

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