CEA 4001 - Page 139

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139

Required

pressure

at

the

control

valve

set 2,6bar

Pressure

available

at

the

control

valve

set

for

the

flow

appropriate

in

HH

e.g. 6,0 bar

Extra

pressure

which

may

be

used:

50%

of

(6,0-2,6)= 1,7bar

The

pipework

shall

be

dimensioned

to

allow

for

a

maximum

pressure

loss

of:

0,5+1,7

(1

000/1

350)²

=

1,43bar

G.2.5 High hazard - HHP and HHS (except intermediate level sprinklers)

G.2.5.1

The

pipe

sizing

depends

upon:

-

the

design

density;

-

the

spacing

of

the

sprinklers;

-

the

K

factor

of

sprinkler

used;

-

the

pressure/flow

characteristic

of

water

supply.

No

pipe

shall

have

a

nominal

diameter

of

less

than

25mm.

G.2.5.2

For

installations

with

water

supplies

with

conform

to

the

demands

shown

in

Table

8

(1)

and

with sprinklers

having

a

K

factor

of

80,

the

pipe

sizes

for

range

pipes

and

distribution

pipes

shown

in

Tables

G11 and

G12

shall

apply.

No

more

than

4

sprinklers

shall

be

installed

on

any

range

pipe.

No

range

pipe

shall

be

connected

to

a distribution

pipe

exceeding

150mm

in

diameter.

100mm

diameter

pipe

may

be

installed

between

the

design points

and

the

control

valve

set

if

calculation

shows

this

to

be

possible.

NOTE:

figure

H5

gives

an

example

of

a

pipe

layout

in

accordance

with

Tables

G11

and

G12

and

design

points

from

which

the

pipe

diameters

shall

be

fully

calculated.

G.2.5.3

For

installations

with

water

supplies

which

conform

to

the

requirements

shown

in

Table

8

(2)

and with

sprinklers

having

a

K

factor

of

80,

the

pipe

sizes

for

range

pipes

and

distribution

pipes

shall

be determined

from

Tables

G11

and

G13.

No

more

than

4

sprinklers

shall

be

installed

on

any

range

Pipe.

No

range

pipe

shall

be

connected

to

a

distribution

pipe

exceeding

150mm

in

diameter.

No

distribution

pipe

less

than

65mm

diameter

is

permitted

for

4

end-side

systems.

150mm

diameter

pipe

may

be

installed

between

the

design

points

and

the

control valve

set

if

calculation

shows

this

to

be

possible.

NOTE:

figure

H6

gives

an

example

of

a

pipe

layout

in

accordance

with

Tables

G11

and

G13

and

design

points

from

which

the

pipe

diameters

shall

be

fully

calculated.

G.2.5.4

For

installations

with

water

supplies

which

conform

to

the

requirements

shown

in

Table

7

(3)

and with

sprinklers

having

a

K

factor

of

80,

and

as

shown

in

Table

8

(4)

with

sprinklers

having

a

K

factor

of

115,

the

pipe

sizes

for

range

pipes

and

distribution

pipes

shown

in

Tables

G13

and

G14

shall

apply.

In

an

end-side

arrangement,

no

more

than

6

sprinklers

shall

be

fitted

to

any

range

pipe.

In

a

two

end-

centre layout,

no

more

than

4

sprinklers

shall

be

fitted

to

any

range

pipe.

No

range

pipe

shall

be

connected

to

a distribution

pipe

exceeding

150mm

in

diameter.

No

distribution

pipe

less

than

65mm

diameter

shall

be

used

for

4

end-side

systems.

150mm

diameter

pipe

may

be

installed

between

the

design

points

and

the

control valve

set

if

calculation

shows

this

to

be

possible.

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