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142
adjacent sprinklers
at
right
angles
to
the
line
joining
the
sprinklers
and
by
the
boundary
of
the
area
covered
(see
figure H8).
Where
in-rack
sprinklers
are
installed,
the
calculation
shall
be
carried
out
taking
into
account
the simultaneous
flow
and
pressure
requirement
for
roof
or
ceiling
sprinklers
and
the
intermediate
level sprinklers.
G.3.2 Locations of the area of operation
G.3.2.1 Hydraulically most unfavourable location
Variations
in
sprinkler
spacing,
layout,
elevation,
range
centres,
sprinkler
orifice
size
and
Pipe
sizes,
as
well
as
all
possible
locations,
whether
on
the
distribution
pipes
or
between
distribution
pipes
where
these
are connected
by
range
pipes,
shall
be
considered
when
determining
the
hydraulically
most
unfavourable location
of
the
area
of
operation
(see
figures
H9,
H11
and
H12.
NOTE:
proof
of
the
correct
position
of
the
hydraulically
most
unfavourable
area
of
operation
in
the
case
of gridded
installations
entails
displacing
the
area
of
operation
by
one
sprinkler
pitch
in
each
direction along
ranges,
and
in
the
case
of
looped
installations
by
one
sprinkler
pitch
along
distribution
pipes.
G.3.2.2 Hydraulically most favourable location
All
possible
locations,
whether
on
the
distribution
pipes,
or
between
distribution
pipes
where
these
are connected
by
range
pipes,
shall
be
considered
when
determining
the
hydraulically
most
favourable
location
of
the
area
of
operation
(see
figures
H10
to
H12).
G.3.3 Shape of the area of operation
G.3.3.1 Hydraulically most unfavourable location
The
area
of
operation
shall
be
as
near
as
possible
rectangular.
The
following
shall
be
considered:
a)
in
the
case
of
terminal
and
looped
configurations,
the
far
side
of
the
area
shall
be
defined
by
the range,
or
pair
of
ranges
where
there
is
an
end-centre
layout.
Sprinklers
not
constituting
a
full range
or
pair
of
ranges
shall
be
grouped
as
close
as
possible
to
the
distribution
pipe
on
the
next
up-stream
range
row
to
the
rectangular
area
(see
figures
H9
and
H12);
b)
in
the
case
of
gridded
configurations
where
ranges
run
parallel
to
the
ridge
of
a
roof
having
a slope
greater
than
6°,
or
along
bays
formed
by
beams
greater
than
1,0m
deep,
the
far
side
of
the area
shall
have
a
length
L
parallel
to
the
ranges,
such
that
L
is
greater
than
or
equal
to
two
times the
square
root
of
the
area
of
operation;
c)
in
the
case
of
all
other
gridded
configurations
the
far
side
of
the
area
shall
have
a
length
L
parallel
to
the
ranges,
such
that
L
is
greater
than
or
equal
to
1,2
times
the
square
root
of
the
area
of
operation;
The
area
of
operation
shall
be
as
far
as
possible
symmetrical
with
respect
to
the
sprinkler
layout
(see
figureH11).

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