Miller 900019 Installations- und Betriebshandbuch - Seite 4
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DONT
use
welding
machine without
grounding
frame
or
case.
I
_
I
DA.
Ground the
ground
cable of every power circuit to
prevent
accidental
shock
by stray
current.
The
potential danger
is that
development
of
a
stray
cur
rent
may
give
a
fatal shock should
a
person,
for
example, place
one
hand
on
thewelding
machine and
the
other
on
the
switch
box,
or
other
grounded
equipment.
Do not
ground
to
pipelines carrying
gases
or
flammable
liquids
and conduits
carrying
electrical
conductors.
Be
sure
conductors
can
safely
carry
the
ground
current.
When
con
necting
the
welding
machine,
properly ground
the
machine
frame
or
case.
WELDING OPERATIONS
1.11. CONTAINERS WHICH HELD COMBUSTIBLES
DONT
weld
on
containers which have held
com
bustible
or
flammable
materials
or
materials
which,
when
heated,
give
off flammable
or
toxic
vapors
without
proper
cleaning,
purging,
or
inerting.
DA.
Welding
on
containers which have heldflammable
or
combustible materials may be
extremely
danger
ous.
To
prevent afireorexplosionof
the
container,
follow
the recommendations of the
American Weld
ing Society Pamphlet
A6.O
Welding
or
Cutting
Con
tainers
Which Have Held
Combustibles.
DONT
depend
on
your eyes
or
nose
to decide if
it is
safe
to weld
on a
closed container.
DB.
Find
out
what
was
in
the
container
or use an
explosimeter.
A
very
small amount of residual
flammable
gas
or
liquid
can
cause
a
serious
explosion.
NEVER
use
oxygen
to ventilate
a
container.
DC.
When
you know the container held
a
gas
or
liquid
which will
readily
dissolve in water:
D(1)
Flush
out with water
several times and then
fill with
water
as
far
as
work
permits, posi
tioning
container
to
permit
introduction of
as
much water
as
possible.
D(2)
Before
welding
be
sure
there is
a
vent
or
opening
to
provide
for release of air pressure.
EW.
When you
know
the container held
a
gas
or
liquid
which will not
readily
dissolve in
water.
D(1)
Clean
out
thoroughly
with steam
or
a
cleans
ing agent
and
purge
all air
or
inert with
a
gas
such
as
carbon dioxide
or
nitrogen
before
re
pairing.
Carbon dioxide is heavier than air
and
will tend to remain in the container if the open
ing
is at
the
top.
D(2)
Use steam to clean out
light
material.
D(3)
Use
a
strong
caustic
soda
solution to clean
out
heavy
oils
or
grease.
0(4)
Be
sure
to
purge all air
or
inert with
a
gas,
such
as
nitrogen
or
carbon
dioxide,
no
matter
how well you
have cleaned.
There may still
be
traces
of
oil,
grease,
or
other
readily
oxidizable material under the
seams.
DE.
Be
careful
when
cleaning
with steam
or
caustic soda
wear
goggles
and
gloves.
DONT
clean
where there is poor
ventilation.
OF.
Ventilation is necessary to carry away harmful
or
explosive
vapors.
DONT
clean where there
are
open
flames.
0G.
When
scraping
or
hammering
to
remove
heavy
sludge
or
scale,
use
a
spark
resistivetool and
keep
it wet to avoid
sparks.
OH.
Keep
your head and
arms
as
far away from your
work
as
possible.
1.12. HOLLOW CASTINGS
DONT
weld
on
hollow
(cored)
castings
that have
not
been
properly
vented.
The
casting
may
explode.
NEVER weld in
or
near
explosive atmospheres,
Such
atmospheres
can
be created
by
flammable
gas leaks
or
by
vapors from flammable
liquids
(gasoline,
alcohol, etc.)
or
by
combustible
dusts.
1.14. VENTILATION
DONT
weld
in
confined spaces without
adequate
ventilation.
DA.
When
welding
in
confined spaces,
provide
ventilation
in accordance with United States of America Stand
ard
Z49.1,
1967.
Always
provide adequate
ventila
tion
by blowers,
air
lines,
or
other
acceptable
means.
Never
use
compressed
oxygen.
The
depletion
of
the
oxygen
supply,
the heat of
welding,
and
the
fumes
given
off
may
cause
severe
dis
comfort
or a
serious
illness.
OB.
When toxic fumes from lead
or
cadmium
bearing
materials
or
any
other substances
are
present
in
harmful
concentrations,
always
use
an
air
supplied
respirator.
L
--
J
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1.10. POWER CIRCUIT GROUND
1
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1.13. EXPLOSION HAZARDS
Page
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