CEA 4001 - Page 135

190 pages

Save Page as PDF

To Next Page

To Next Page

To Previous Page

To Previous Page

Loading...

135

G.2.1.4

Risers

or

drops,

connecting

distribution

pipes

to

ranges,

and

pipes

connecting

single

sprinklers, other

than

arm

pipes,

shall

be

considered

as

distribution

pipes

and

sized

accordingly.

G.2.2 Location of Design Points

G.2.2.1

The

design

point

shall

be

located

at

the

point

of

connection

of

a

horizontal

distribution

pipe

to

one

of

the

following:

-

a

range

pipe;

-

a

riser

or

drop

connecting

ranges

to

distribution

pipes;

-

a

pipe

feeding

a

single

sprinkler.

The

maximum

number

of

sprinklers

downstream

of

each

design

point

is

specified

in

Tables

G4

and

G5.

The design

point

is

located

by

counting

from

the

hydraulically

most

remote

sprinkler

in

the

array.

G.2.2.2

In

Light

Hazard

installations

the

design

point

shall

be

located

downstream

of

the

sprinkler

identified

in

Table

G4

column

3.

G.2.2.3

In

Ordinary

and

High

Hazard

installations

the

design

point

shall

be

located

downstream

of

the junction

of

distribution

pipes

and

range

pipes

in

accordance

with

Table

G5

column

3.

Where

the

number

of

sprinklers

on

one

array

in

a

room,

or

on

a

single

distribution

pipe,

is

less

than

or

equal

to

the

number

of

sprinklers

for

which

the

distribution

pipes

are

designed,

indicated

in

Table

G5

column

2,

the

design

point

shall

be

positioned

downstream

of

the

point

of

connection

to

the

distribution

pipe

of

the range

or

the

array

hydraulically

nearest

to

the

control

valve

set.

Table 40: Location of design points – LH (G4)

Hazard

class

Number

of

sprinklers

on

a

range,

in

a

room

Location

of

design

point

downstream

of

n

th

sprinkle

r

where

n

is

LH

≤3

≥4

3

4

Table 41: Location of design points - OH, HHP and HHS (G5)

Hazard

class

Number

of

sprinklers on

a

distribution

pipe, in

a

room

Location

of

design

point

on

a

distributio

n

pipe

junction

to

a

range

holding

n

th

sprinkler

where

n

is

Range

layout

OH

>

16

17

two

end-side

HHP

and

HHS

>

18

>

48

19

49

all

except

two

end-side

all

NOTE

1:

figure

H2

illustrates

typical

range

pipe

arrays.

NOTE

2:

examples

of

pie

layouts

with

the

appropriate

design

points

are

given

in

Figure

H3

for

LH, Figure

H4

for

OH

and

Figures

H5,

H6

and

H7

for

HHP

and

HHS.

Table of Contents