CEA 4001 - Type of Water Supply

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56

Pressure

tanks

used

as

a

single

supply

shall

be

provided

with

means

for

automatically

maintaining

the

air

pressure

and

water

level.

The

air

and

water

supplies

shall

be

capable

of

filling

and

pressurising

the

tank

completely

in

no

more

than

8

hours.

The

water

supply

shall

be

capable

of

topping

up

with

water

at

the

gauge

pressure

(P

in

8.5.4)

of

the

pressure

tank

with

a

flow

of

at

least

6m

3

/hr.

8.5.6 Control and safety equipment

The

tank

shall

be

fitted

with

a

pressure

gauge

and

the

correct

service

pressure

shall

be

marked

on

the

gauge.

A

gauge

glass

shall

be

fitted

to

indicate

the

water

level.

Stop

valves

shall

be

fitted

at

each

end

of

the

gauge

glass

and

they

shall

normally

be

kept

closed

and

a

drain

valve

shall

also

be

provided.

The

gauge

glass

shall

be

protected

against

mechanical

damage

and

shall

be

marked

with

the

correct

water

level.

The

tank

shall

be

fitted

with

suitable

safety

devices

to

ensure

that

the

highest

permitted

pressure

is

not

exceeded.

8.6 Type of water supply

An

example

of

the

choice

of

the

water

supply

is

given

in

annex

N.

The

authorities

shall

be

consulted

to

determine

the

choice

of

water

supply.

8.6.1 Single water supplies

The

water

supply

shall

conform

to

the

pressure,

flow

and

duration

requirements

given

in

clauses

8

and

6.

The

following

constitute

acceptable

single

water

supplies:

a)

town

main;

b)

town

with

one

or

more

booster

pumps;

c)

pressure

tank

(LH

and

OH

I

only);

d)

gravity

tank;

e)

storage

tank

with

one

or

more

pumps;

f)

inexhaustible

source

with

one

or

more

pumps.

8.6.2 Superior single water supplies

Superior

single

water

supplies

are

single

water

supplies

which

provide

a

higher

degree

of

reliability.

They

include

the

following:

a)

town

main

fed

from

both

ends,

where

each

end

is

capable

of

satisfying

the

pressure

and

flow demands

of

the

system.

The

town

main

pipe

network

shall

be

fed

from

two

or

more

water sources

and

shall

not

be

dependent

at

any

point

on

a

single,

common

trunk

main;

If

booster

pumps

are

required,

two

or

more

shall

be

provided;

b)

gravity

tank

with

no

booster

pump,

or

water

storage

tank

with

two

or

more

pumps,

where

the

tank

fulfils

the

following

conditions:

the

tank

shall

be

full

capacity;

there

shall

be

no

entry

for

light

or

foreign

matter;

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