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CEA 4001 - Hydraulic design criteria; High Hazard Storage - HHS

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38
other cases.
See
15.3
for
the
pipework
arrangement.
6 Hydraulic design criteria
6.1 General
The
design
density
shall
be
not
less
than
the
appropriate
value
given
in
this
clause
when
all
the
ceiling
or roof
sprinklers
in
the
room
concerned,
or
in
the
area
of
operation,
whichever
is
the
fewer
plus
any
in-rack sprinklers
and
supplementary
sprinklers,
are
in
operation.
The
minimum
requirements
for
design
density
and area
of
operation
for
LH,
OH
and
HHP
classes
are
given
in
Table
4.
For
HHS
systems,
6.2
shall
be
applied.
NOTE:
for
pre-calculated
systems,
the
correct
design
criteria
are
assumed
to
be
achieved
by
the application
of
water
supply
and
piping
requirements
elsewhere
in
these
rules.
Table 4: Design density and area of operation for LH, OH and HHP
Hazard
class
Design
density
(minimum)
mm/min
Area
of
operation
m²
Wet
or
pre-action
Dry
or
alternate
LH
2,2
84
not
allowed
-
use
OH1
OH1
5,0
72
90
OH2
5,0
144
180
OH3
5,0
216
270
OH4
5,0
360
not
allowed
-
use
HHP1
HHP1
7,5
260
325
HHP2
10,0
260
325
HHP3
12,5
260
325
HHP4
Special
consideration
apply
Areas
of
different
densities
in
open
communication
shall
be
separated
by
a
zone
of
at
least
2
sprinkler
rows
wide
of
the
higher
density
extending
into
the
designed
area
of
lower
density.
6.2 High Hazard Storage - HHS
6.2.1 General
The
type
of
protection
and
determination
of
the
design
density
and
area
of
operation
are
dependent
on
the combustibility
of
the
product
(or
mix
of
products)
and
its
packaging
(including
the
pallet)
and
the
method and
height
of
storage.
Specific
limitations
apply
to
the
various
types
of
storage
methods
as
detailed
in
Clause
5.
6.2.2 Ceiling or roof protection only
Table
5
specifies
the
appropriate
design
density
and
area
of
operation
according
to
the
category
and maximum
permitted
storage
height
for
the
various
types
of
storages
with
roof
or
ceiling
protection
only. More
specifically,
the
storage
heights
indicated
in
the
table
are
considered
the
maximum
for
efficient sprinkler
protection
where
sprinklers
are
only
provided
at
the
roof
or
ceiling.
Storage
heights
exceeding
these limits
require
that
intermediate
levels
of
in-rack
sprinklers
be
provided
as
per
6.2.3
below.
The
distance between
the
maximum
permitted
storage
height
and
the
roof
or
ceiling
sprinklers
should
not
exceed
4m.

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