CEA 4001 - Water Supplies - General; Suitability

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44

6.4.2 Maximum system pressure

Sprinkler

systems

shall

be

designed

in

such

a

way

as

to

ensure

that

sprinkler

heads

are

never

subjected

to

a pressure

in

excess

of

12

bar

except

during

pressure

testing

of

the

pipework,

when

the

pressure

shall

not exceed

15

bar.

7 Water Supplies - General

7.1 Suitability

7.1.1 Time of operation

Water

supplies

shall

be

capable

of

furnishing

automatically

at

least

the

requisite

pressure/flow

conditions

of

the

system.

Except

as

specified

in

the

case

of

pressure

tanks,

each

water

supply

shall

have

a

minimum

water

volume

for

the

following

minimum

durations:

-

LH

30min

-

OH

60min

-

HHP

90min

-

HHS

90min

NOTE

1:

in

the

case

of

town

mains,

inexhaustible

sources

and

all

pre-calculated

systems,

the

duration

is

implicit

in

the

requirements

given

in

these

rules.

A

water

supply

shall

not

be

affected

by

possible

frost

conditions

or

drought

or

flooding

or

any

other

conditions

that

could

reduce

the

flow

or

effective

capacity

or

render

the

supply

inoperative.

All

practical

steps

shall

be

taken

to

ensure

the

continuity

and

reliability

of

water

supplies.

NOTE

2:

water

supplies

should

preferably

be

under

the

control

of

the

user,

or

else

the

reliability

and

right

of

use

should

be

guaranteed

by

the

organisation

having

control.

The

water

shall

be

free

from

fibrous

or

other

matter

in

suspension

liable

to

cause

accumulations

in

the

system

piping.

Salt

or

brackish

water

shall

not

be

retained

in

sprinkler

installation

pipework.

NOTE

3:

where

there

is

no

suitable

fresh

water

source

available,

a

salt

or

brackish

water

supply

may

be

used

provided

the

installation

is

normally

charged

with

fresh

water.

NOTE

4:

in

certain

countries,

the

authorities

may

accept

reduced

duration.

7.1.2 Frost protection

The

installation

control

valve

set

and

the

feed

pipe

shall

be

maintained

at

a

minimum

temperature

of

4°C.

7.2 Connections for other services

Water

for

other

services

may

be

taken

from

a

sprinkler

system

only

in

accordance

with

the

following:

a)

as

specified

in

Table

9;

b)

through

a

stop

valve

fitted

upstream

of

the

installation

control

valve

set(s),

as

close

as

is

practical

to

the

point

of

connection

to

the

sprinkler

system

supply

pipe;

and

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