CEA 4001 - Inexhaustible Sources

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52

In

the

case

of

pumps

under

suction

lift

conditions,

a

strainer

shall

be

fitted

upstream

of

the

back

pressure valve

on

the

pump

suction

pipe.

It

shall

be

fitted

so

that

it

can

be

cleaned

without

the

tank

having

to

be emptied.

In

the

case

of

open

tanks

feeding

pumps

under

positive

head

conditions,

a

strainer

shall

be

fitted

to the

suction

pipe

outside

the

tank.

A

stop

valve

shall

be

installed

between

the

tank

and

the

strainer.

Strainers

shall

have

a

cross-sectional

area

of

at

least

1.5

times

the

nominal

area

of

the

pipe

and

shall

not

allow

objects

greater

than

5mm

diameter

to

pass.

8.4 Inexhaustible sources

Water

sources

include

natural

and

artificial

sources

such

as

rivers,

canals

and

lakes

which

are

virtually

inexhaustible

for

reasons

of

capacity

and

climate

etc.

8.4.1 Settling chambers and suction pits

8.4.1.1

Where

a

suction

or

other

pipe

draws

from

a

settling

chamber

or

suction

pit

fed

from

an

exhaustible source,

the

design

and

dimensions

in

Figure

5

shall

apply.

Pipes,

conduits

and

the

bed

of

open-topped channels

shall

have

a

continuous

slope

towards

the

settling

chamber

or

suction

pit

of

at

least

1:125.

The

0,357

diameter

of

feed

pipes

or

conduit

shall

be

determined

by

the

following

formula

d

21,68

Q

where:

d:

internal

diameter

in

mm;

Q:

flow

in

1/min.

The

suction

chamber

dimensions

shall

be

as

specified

in

8.3.5.

In

the

case

of

flowing

waters

the

angle

between

the

flow

direction

and

the

intake

axis

(seen

in

the

direction

of

flow)

shall

be

less

than

60°.

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