P/N
06
‐
791
‐
4
(Rev.
4)
Page
69
704
SW
10
th
Street,
P.O.
Box
610,
Blue
Springs,
Missouri
64013
‐
0610
U.S.A.
●
Phone:
(816)
229
‐
3405
●
www.fike.com
Pendent
Obstructions
Obstructions
of
single
Pendent
Nozzles:
Objects
or
structures
which
are
not
fixed
to
the
ceiling
are
to
be
considered
Pendent
Obstructions.
For
the
simplification
of
these
calculations,
the
total
area
of
the
obstruction
(A
o
)
shall
be
defined
as
the
area
of
which
the
obstruction
covers
when
observed
from
a
horizontal
plan
view
above
the
nozzle.
The
spray
pattern
area
at
the
top
of
obstruction
(A
sp
)
shall
be
defined
as
the
area
of
the
top
most
horizontal
plane
of
the
spray
pattern,
of
which
the
obstruction
is
present.
The
area
of
an
obstruction
(A
o
)
is
not
to
exceed
25%
of
the
area
of
the
spray
pattern
at
the
top
of
the
obstruction
(A
sp
).
If
the
area
of
an
obstruction
(A
o
)
exceeds
25%
of
the
spray
pattern
area
at
the
top
of
obstruction
(A
sp
),
additional
nozzles
shall
be
installed
beneath
or
adjacent
to
the
obstruction
so
the
obstruction
is
protected.
Additional
nozzles
shall
therefore
be
installed
beneath
or
adjacent
to
the
obstruction,
if
the
following
statement
is
true:
(A
o
/
A
sp
)
◦
100
≥
25%.
Figure
56:
Obstructions
of
Single
Pendent
Nozzles
Obstructions
of
Multiple
Pendent
Nozzles:
Obstructions
shall
be
exempted
from
the
above
mentioned
requirements
only
if
the
obstructions
are
situated
in
the
spray
pattern
of
two
or
more
nozzles
and
that
they
do
not
obstruct
more
than
30%
of
the
spray
pattern
area
at
the
top
of
the
obstruction
(A
sp
)
of
each
of
the
involved
nozzles.
Figure
57:
Obstructions
of
Multiple
Pendent
Nozzles
Summary of Contents for DuraQuench
Page 93: ......
