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64

T

Table 18: Minimum pump characteristics for LH and OH (pre-calculated systems)

Hazard class

Sprinkler height

h above the

control valve

set(s)

m

Nominal data

Characteristic

Pressure

bar

Flow l/min

Pressure

bar

Flow l/min

Pressure

bar

Flow l/min

LH wet or pre-

action

h ≤ 15

15

<

h ≤ 30

30

<

h ≤ 45

1,5

1,8

2,3

300

340

375

3,7

5,2

6,7

225

225

225

-

-

-

-

-

-

OH1 wet or

pr

e-action

h ≤ 15

15

<

h ≤ 30

30

<

h ≤ 45

1,2

1,9

2,7

900

1 150

1 360

2,2

3,7

5,2

540

540

540

2,5

4,0

5,5

375

375

375

OH1 dry or

alt

ernat

e OH2

w

et or pre-

action

h ≤ 15

15

<

h ≤ 30

30

<

h ≤ 45

1,4

2,0

2,6

1 750

2 050

2 350

2,5

4,0

5,5

1 000

1 000

1 000

2,9

4,4

5,9

725

725

725

OH2 dry or

alt

ernativ

e OH3

w

et or pre-

action

h ≤ 15

15

<

h ≤ 30

30

<

h ≤ 45

1,4

2,0

2,5

2 250

2 700

3 100

2,9

4,4

5,9

1 350

1 350

1 350

3,2

4,7

6,2

1 100

1 100

1 100

OH3 dry or

alt

ernat

e OH4

w

et or pre-

action

h ≤ 15

15

<

h ≤ 30

30

<

h ≤ 45

1,9

2,4

3,0

2 650

3 050

3 350

3,0

4,5

6,0

2 100

2 100

2 100

3,5

5,0

6,5

1 800

1 800

1 800

NOTE

1:

the

pressures

shown

are

as

measured

at

the

control

valve

set(s)

NOTE

2:

In

the

case

of

buildings

which

exceed

the

heights

shown,

it

shall

be

proved

that

the

pump characteristics

are

adequate

for

supplying

the

flows

and

pressures

specified

in

6.3.1.

9.7.3

Pre-calculated

systems

-

HHP

and

HHS

with

no

in-rack

sprinklers

The

nominal

pump

flow

and

pressure

for

HHP

and

HHS

pre-calculated

systems

shall

conform

to

6.3.2.

In

addition

the

pump

shall

be

capable

of

supplying

140%

of

this

flow

at

a

pressure

of

no

less

than

70%.

9.7.4

Calculated

systems

The

rated

duty

of

the

pump

shall

be

a

function

of

the

most

unfavourable

area

curve.

When

measured

in

the supplier's

test

facility,

the

pump

shall

provide

a

pressure

at

least

0.5

bar

higher

than

that

required

for

the

most unfavourable

area.

The

pump

shall

also

be

capable

of

providing

the

flow

and

pressure

of

the

most unfavourable

area

at

all

water

supply

water

levels

(see

annex

H).

9.7.5 Pressure and water capacity of boosted town mains

If

it

is

intended

to

connect

a

pump

to

a

town

main,

a

test

shall

first

be

carried

out

to

show

that

it

can

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