CEA 4001 - Page 48

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48

jointly

by

the

effective

capacity

of

the

tank

plus

the

automatic

infill.

The

effective

capacity

of

a

tank

shall

be

calculated

by

taking

the

difference

between

the

normal

water

level

and

the

lowest

effective

water

level.

If

the

tank

is

not

frost

proof,

the

normal

water

level

shall

be

increased

by

1,0m

and

ice

venting

provided.

In

the

case

of

enclosed

tanks,

easy

access

shall

be

provided.

8.3.2.1 Precalculated systems

Table

10

specifies

the

minimum

effective

volume

of

water

required

for

LH

and

OH

precalculated

systems.

The

quantities

of

water

indicated

shall

be

reserved

solely

for

the

use

of

the

sprinkler

system.

T

Table 10: Minimum water volume for precalculated LH and OH systems

Group

Height

h

of

the

highest

sprinkler

above

the

lowest

sprinkler*

m

Minimum water

volume

m

3

LH

-

Wet

or

pre-action

h

≤

15

15<

h

≤

30

30

<

h

≤

45

9

10

11

OH1

-

Wet

or

pre-action

h

≤

15

15

<

h

≤

30

30

<

h

≤

45

55

70

80

OH1

-

Dry

or

alternate

OH2

-

Wet

or

pre-action

h

≤

15

15

<

h

≤

30

30

<

h

≤

45

105

125

140

OH2

-

Dry

or

alternate

OH3

-

Wet

or

pre-action

h

≤

15

15

<

h

≤

30

30

<

h

135

160

185

OH3

-

Dry

or

alternate

OH4

-

Wet

or

pre-action

h

≤

15

15

<

h

≤

30

30

<

h

≤

45

160

185

200

OH4

-

Dry

or

alternate

Use

HH

protection

*

Excluding

sprinklers

in

the

sprinkler

valve

room.

Table

11

specifies

the

minimum

quantity

of

water

required

for

precalculated

HHP

or

HHS

systems.

The

water

volume

indicated

shall

be

reserved

solely

for

the

use

of

the

sprinkler

system.

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