CEA 4001 - Page 86

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86

12.2.2

to

12.2.4.

12.2.2 Ceiling or flush, recessed and concealed pattern

Ceiling

or

flush,

recessed

and

concealed

sprinklers

shall

not

be

installed

in

OH4,

HHP

or

HHS

areas.

Sprinklers

without

fixed

deflectors,

i.e.

with

retracted

deflectors

which

drop

to

the

operating

position

on actuation,

shall

not

be

fitted:

a)

where

the

ceiling

is

more

than

45°

from

the

horizontal;

b)

in

situations

where

the

atmosphere

is

corrosive

or

likely

to

have

a

high

dust

content;

c)

in

racks

or

under

shelves.

12.2.3 Sidewall pattern

Sidewall

sprinklers

shall

not

be

installed

in

HHP

or

HHS

installations

or

above

suspended

ceilings.

They

may

only

be

installed

under

flat

ceilings.

12.2.4 Flat spray pattern

The

use

of

flat

spray

sprinklers

shall

be

restricted

to

concealed

spaces,

suspended

open

ceilings

and

in

racks.

12.2.5 Extended coverage sprinkler

This

type

of

sprinkler

may

be

used

for

special

protection

e.g.

hotel

bedroom,

with

an

approval

by

the authorities.

Only

Quick

response

sensitivity

shall

be

used.

12.2.5.1

Extended

coverage

sidewall

sprinkler

Extended

coverage

sidewall

sprinklers

may

be

used

in

LH

and

OH1

hazards.

They

may

be

used

in

rooms, which

have

a

maximum

area

of

126

m²,

a

fire

resistance

of

the

compartment

of

at

least

30

minutes,

a

smooth ceiling

and

a

maximum

ceiling

height

of

4,1m.

In

one

area

only,

sprinklers

with

identical

response sensitivity

class

may

be

used.

The

area

per

sprinkler

must

not

exceed

21

m².

In

rooms

with

a

maximum

width

of

6,5

m,

only

one

row

of extended

coverage

sidewall

sprinklers

needs

to

be

installed

along

the

longitudinal

wall.

In

rooms

with

a width

of

between

6,5

m

and

11

m,

two

rows

of

extended

coverage

sidewall

sprinklers

must

be

installed

along each

of

the

longitudinal

walls.

In

this

case,

the

sprinklers

must

be

installed

staggered.

The

area

of

operation

with

extended

coverage

sidewall

sprinklers

shall

not

be

less

than

126

m².

The

minimum

design

pressure

shall

be

2,5

bar

for

ceiling

heights

up

to

2,8

m

and

3

bar

for

ceiling

heights between

2,8m

and

4,1m.

The

distance

between

two

extended

coverage

sidewall

sprinklers

installed

along

the

same

wall

shall

be between

3

m

and

4,5

m.

Extended

coverage

sidewall

sprinklers

shall

be

installed

at

a

maximum

distance

of

300

mm

from

the

adjacent

wall

and

at

a

distance

of

100

mm

to

250

mm

from

the

ceiling.

Extended

coverage sidewall

sprinklers

shall

be

installed

at

a

minimum

horizontal

distance

of

0,5

m

from

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