CEA 4001 - Isolation of Water Supplies

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57

potable

water

shall

be

used;

painting

or

other

corrosion

protection,

which

reduces

the

need

for

emptying

the

tank

for

maintenance

shall

be

approved

by

the

authorities

(see

clause

18.4.6);

c)

inexhaustible

source

with

two

or

more

pumps.

8.6.3 Duplicate water supplies

Duplicate

water

supplies

consist

of

two

single

water

supplies

where

each

supply

is

independent

of

the

other. Each

of

the

supplies

forming

part

of

a

duplicate

supply

shall

conform

to

the

pressure

and

flow

characteristics given

in

clause

6.

Any

combination

of

single

supplies

(including

superior

single

supplies)

may

be

used,

with

the

following

limitations:

a)

no

more

than

one

pressure

tank

shall

be

used

for

OH

systems;

b)

no

more

than

one

storage

tank

of

the

reduced

capacity

type

shall

be

used.

Two

or

more

pumps

drawing

water

from

two

independent

suction

tanks

constitute

an

acceptable

duplicate

water

supply.

8.6.4 Combined water supplies

Combined

water

supplies

are

superior

single

or

duplicate

water

supplies

designed

to

supply

more

than

one

fixed

fire

fighting

system,

as

for

example

in

the

case

of

combined

hydrant,

hose

and

sprinkler

installations.

NOTE:

some

countries

may

not

allow

sprinkler

systems

to

be

fed

from

a

combined

supply.

Combined

supplies

shall

fulfil

the

following

conditions:

a)

the

systems

shall

be

fully

calculated;

b)

the

supply

shall

be

capable

of

supplying

the

sum

of

the

simultaneous

maximum

calculated

flows

from

each

system.

The

flows

shall

be

corrected

up

to

the

pressure

required

by

the

most demanding

system;

c)

the

duration

of

the

supply

shall

be

no

less

than

that

required

for

the

most

demanding

system;

d)

duplicate

pipe

connections

shall

be

installed

between

the

water

supplies

and

the

systems.

8.7 Isolation of water supplies

The

connections

between

the

water

sources

and

sprinkler

control

valve

sets

shall

be

arranged

so

as

to

ensure

the

following:

a)

that

servicing

of

main

components

such

as

strainers,

pumpsets,

back

pressure

valves

and

water

meters

is

facilitated;

b)

that

any

problem

occurring

to

one

supply

shall

not

impair

the

operation

of

any

other

source or

supply;

c)

that

maintenance

can

be

carried

out

on

one

supply

without

impairing

the

operation

of

any

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