CEA 4001 - Alarms and alarm devices

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93

the non-return

valve,

('A

gauge').

Each

pump

supply

shall

be

fitted

with

a

damped

pressure

gauge

on

the

supply

pipe

immediately

downstream of

the

outlet

non-return

valve

and

upstream

of

any

outlet

stop

valve.

13.7.2 Control valve set

Each

set

of

installation

control

valves

shall

have

a

pressure

gauge

fitted

at

each

of

the

following

points:

a)

immediately

upstream

of

the

control

valve

set,

('B'

gauge);

b)

immediately

downstream

of

the

control

valve

set,

('C'

gauge);

c)

immediately

downstream

of

subsidiary

control

valve

sets,

but

upstream

of

any stop

valve.

13.7.3 Removal

Means

shall

be

provided

to

enable

each

pressure

gauge

to

be

removed

readily

without

interruption

of

the water

or

air

supply

to

the

installation.

13.8 Measures against over pressurisation

Where

it

is

expected

to

have

a

pressure

expansion

above

12

bar

in

the

pipework

(e.g.

systems

with

large

temperature

variations

and

antifreeze

systems),

an

expansion

vessel

or

a

relief

valve

should

be

installed.

In case

of

using

a

relief

valve,

it

shall

be

installed

downstream

of

the

control

valve

on

the

riser.

Relief

valves

shall

have

a

nominal

diameter

between

10

mm

and

25

mm

and

operate

at

pressures

not

greater than

12

bar.

For

maintenance

purposes,

the

relief

valve

shall

be

fitted

with

an

isolation

valve.

1

14 Alarms and alarm devices

14.1 Water motor alarms

14.1.1 General

Each

control

valve

set

shall

be

provided

with:

-

a

separate

water

motor

alarm;

-

or

an

electric

pressure

switch

with

an

indication

for

each

control

valve

set;

-

or

both

located

as

close

as

possible

to

the

alarm

valve.

A

single

alarm

motor

and

gong

may

be

installed

common

to

a

group

of

wet

alarm

valves

provided

that

these

are

situated

in

the

same

valve

room

and

an

indicator

is

fitted

to

each

alarm

valve

to

show

when

it

is operating.

14.1.2 Water motor and gong

The

water

motor

shall

be

installed

with

its

gong

on

the

outside

of

an

exterior

wall

and

with

its

centre

line

not higher

than

6m

above

the

point

of

connection

to

the

alarm

valve.

A

strainer,

readily

accessible

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