d
e
f
g
h
©
Street
Crane
Co
Ltd
Ref:
D3256
rev.
B
Page
81
of
103
7
TECHNICAL
DATA
7.1
CONDITIONS
OF
USE
Standard
ZX6
and
ZX8
hoist
units
and
designed
to
operate
indoors,
in
an
ambient
temperature
range
of
–10
to
+40°C,
at
an
altitude
less
than
1000m
above
sea
level
and
in
an
atmosphere
of
normal
humidity
free
of
contamination
and
harmful
deposits.
Equipment
class
of
protection
against
dust
and
moisture
is
IP55.
For
environments
outside
this
range,
i.e.
outdoor,
chemical
pollution,
offshore
etc.,
consult
Street
Crane
Co.
7.2
PROCEDURE
FOR
ESTIMATING
REMAINING
SERVICE
LIFE
The
following
gives
a
procedure
for
estimating
the
remaining
service
life
of
the
hoist.
The
hoist
is
classified
into
groups
(M3
to
M8)
according
to
the
desired
service
life
and
the
conditions
of
loading
(L1
to
L4)
to
which
it
will
be
subjected.
1.
Calculate
or
estimate
the
state
of
loading
for
the
hoist
(L?).
If
detailed
information
on
the
loading
conditions
is
available,
the
competent
person
may
be
able
to
calculate
the
state
of
loading
accurately
by
following
the
guidelines
given
in
BS
466,
FEM
1.001
or
EN/ISO4301.
If
such
information
is
not
available
then
the
competent
person
can
estimate
the
state
of
loading
using
following
descriptive
guidelines.
L1
(light)
Mechanisms
subjected
very
rarely
to
their
maximum
load
and
normally
to
very
light
loads.
L2
(moderate)
Mechanisms
occasionally
subjected
to
their
maximum
load
and
normally
to
rather
light
loads.
L3
(heavy)
Mechanisms
frequently
subjected
to
their
maximum
load
and
normally
to
loads
of
medium
magnitude.
L4
(very
heavy)
Mechanisms
regularly
subjected
to
their
maximum
load.
2.
Ascertain
the
classification
of
the
hoist
(M?).
The
group
classification
of
your
equipment
can
be
found
on
the
equipment
nameplate.
See
section
2.1
for
nameplate
and
7.3
hoist
model
code.
3.
Knowing
the
state
of
loading
and
the
hoist
classification,
determine
the
life
expectancy
of
the
hoist
measured
in
hours
from
the
following
table.
State
of
Loading
Mechanism
Classification
M3
M4
M5
M6
M7
M8
L1
(light)
3200
6300
12000
25000
50000
>50000
L2
(moderate)
1600
3200
6300
12000
25000
50000
L3
(heavy)
800
1600
3200
6300
12000
25000
L4
(very
heavy)
400
800
1600
3200
6300
12000
The
hoist
is
provided
with
a
‘hours
‐
in
‐
service’
meter.
This
meter
records
the
actual
hours
run
by
the
hoist.
This
reading
should
be
compared
with
the
expected
service
life
as
determined
from
the
above
procedure.
When
the
meter
reading
approaches
95%
of
the
expected
service
life,
the
user
should
consider
replacing
the
hoist
or
including
a
major
overhaul
as
part
of
the
immediate
maintenance
procedure.
If
meter
reading
exceeds
the
calculated
service
life,
the
life
expectancy
of
the
hoist
has
been
exceeded
and
the
hoist
should
be
taken
out
of
service.
Example
.
A
hoist
with
a
design
classification
of
M5
and
a
calculated
/
estimated
state
of
loading
of
L2
has
an
expected
service
life
of
6300
hours.
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