CEA 4001 - Sprinkler System Design

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173

Note

7

The

values

given

for

a

maximum

ceiling

height

of

12,2m

shall

be

used.

L.1.4.4

ESFR

sprinklers

shall

only

be

installed

in

buildings

with

roofs

or

ceilings

which

:

a)

have

a

slope

not

exceeding

170mm/m.;

b)

are

continuous

and

have

no

permanent

opening;

c)

are

of

non-combustible

construction;

d)

withstand

an

upward

pressure

of

150

N/m

2

.

NOTE

1:

Where

the

roof

or

ceiling

slope

exceeds

170mm/m,

the

roof

or

ceiling

may

be

underdrawn with

a

false

ceiling

complying

with

(a)

to

(d)

above,

with

EFSR

sprinklers

located

below

the false

ceiling.

NOTE

2:

Typical

ceiling

materials

include

10

mm

gypsum

board,

corrugated

or

sheet

steel

and mineral

tiles.

NOTE

3:

Concealed

spaces

shall

comply

with

5.4.”

L.1.4.5

The

following

example

of

storage

or

commodities

are

not

suitable

for

protection

by

ESFR

sprinklers:

-

certain

storages

which

exhibit

unusual

fire

characteristics

such

as

roll

tissue;

-

open-top

combustible

containers;

-

unusual

commodities

or

storage

arrangements

which

have

not

been

proven,

by

either testing

or

analysis,

to

be

appropriate

for

ESFR

sprinklers

protection;

-

warehouses

in

which

the

commodities

or

the

type

of

storage

are

unpredictable;

-

special

risks

which

are

described

in

Annex

K

(K1

aerosols,

K3

flammable

liquid

storages,

K5

spirituous

liquors

and

K7

storage

containers

fabricated

from

polypropylene

and polyethylene);

-

rubber

tyres.

L.2 Sprinkler System Design

L.2.1 General

L.2.1.1

Only

wet-pipe

systems

shall

be

used.

L.2.1.2

ESFR

protection

is

based

on

construction

without

roof

vents

or

other

roof

opening.

If

roof

vents

or

other

roof

openings

are

unavoidable,

they

shall

be

operated

manually.

Any

draft

curtains

used

in

conjunction

with

roof

vents

or

other

roof

openings

shall

be

limited

in

depth

and

located

with

respect

to sprinklers

so

that

distances

specified

in

Table

L3

are

complied

with.

Any

open

roof

vents

or

other

roof

openings

shall

be

closed

automatically

preferably

before,

but

in

no

case

more than

30

s

after,

the

operation

of

the

first

sprinkler.

L.2.1.3

The

clear

space

beneath

the

sprinkler

deflectors

shall

be

no

less

than

1m.

L.2.1.4

Skylights

shall

be

flush

to

the

ceiling

or

underdrawn

at

ceiling

level.

The

skylights

shall

be

capable

of

withstanding,

without

failure,

a

temperature

of

300°C

for

at

least

5min.

Where

powered

ventilation

is

employed,

the

building

shall

be

protected

by

an

approved

fire

alarm

installation.

The

powered

ventilation

shall

be

stopped and

any

dampers

closed

automatically

in

response

to

the

fire

detection

system

alarm

of

fire.

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