CEA 4001 - Town mains; Water storage tanks

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47

Water

supplies

shall

be

one

or

more

of

the

following:

a)

town

mains

(see

8.2);

b)

water

storage

tanks

(see

8.3);

c)

inexhaustible

sources

(see

8.4);

d)

pressure

tanks

(see

8.5).

8.2 Town mains

8.2.1 General

The

town

main

shall

be

capable

of

satisfying

the

requirements

for

pressure,

flow

and

duration.

NOTE:

it

may

be

necessary

to

take

into

account

extra

flow

required

for

fire

brigade

purposes.

Consideration

shall

be

given

to

fitting

strainers

on

all

connections

from

town

mains.

In

the

case

of

single

water

supplies,

consideration

shall

be

given

to

the

installation

of

a

pressure

switch

on

the

supply

connection

which

shall

operate

an

alarm

system

when

the

pressure

in

the

supply

drops

to

a

predetermined

value.

The

switch

shall

be

positioned

on

the

supply

side

of

any

back

pressure

valve

and

shall

be

equipped

with

a

test

valve.

8.2.2 Boosted mains

If

booster

pumps

are

used,

they

shall

be

installed

in

accordance

with

the

requirements

of

clause

9.

NOTE:

the

agreement

of

the

water

authority

will

normally

be

needed

before

a

booster

pump

can

be connected

to

a

town

main.

The

water

authority

or

water

undertaker

will

normally

require

that

the

pump

cannot

draw

vacuum

under

any

water

supply

and

demand

condition.

Stop

valves

shall

be

fitted

in

the

pump

suction

and

delivery

pipes

as

well

as

back

pressure

valves

in

the

pump

delivery.

Where

a

single

pump

is

supplied,

a

by-pass

connection

shall

be

provided

with

at

least

the

same

dimension

as

the

water

supply

connection

to

the

pump

and

be

fitted

with

a

back

pressure

valve

and

two

stop valves.

The

pump

or

pumps

shall

be

reserved

solely

for

fire

protection.

8.3 Water storage tanks

8.3.1 General

Water

storage

tanks,

where

used,

shall

be

one

or

more

of

the

following:

-

pump

suction

tank;

-

-

gravity

tank;

-

reservoir.

8.3.2 Minimum water volume

For

each

system

a

minimum

water

volume

is

specified.

This

shall

be

supplied

from

one

of

the

following:

-

a

full

capacity

tank,

with

an

effective

capacity

at

least

equal

to

the

specified

minimum

water

volume.

The

tank

may

be

divided

into

two

sections;

-

a

reduced

capacity

tank

(see

8.3.4),

where

the

required

minimum

water

volume

is

supplied

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