Miller ps-100 Manual do Proprietário - Página 6

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vapors
to
form
phosgene.
DO NOT WELD
or
cut
where
solvent vapors
can
be drawn into the
welding
or
cutting
atmosphere
or
where the
radiant energy
can
penetrate
to
atmospheres containing,
even
minute
amounts
of
trichioroethylene
or
perchioroethylene.
C.
Fire and
Explosion
Prevention
Causes of fire and
explosion
are:
combustibles
reached
by
the
arc,
flame,
flying sparks,
hot
slag
or
heated
mate
rial;
misuse of
compressed
gases
and
cylinders;
and
short circuits.
BE AWARE THAT
flying sparks
or
falling slag
can
pass
through
cracks,
along pipes, through
windows
or
doors,
and
through
wall
or
floor
openings,
out of
sight
of the
goggled
operator.
Sparks
and
slag
can
fly
35 feet.
To
prevent
fires and
explosion:
Keep equipment
clean and
operable,
free
of
oil,
grease,
and
(in
electrical
parts)
of metallic
particles
that
can
cause
short circuits.
If
combustibles
are
in
area,
do NOT weld
or
cut.
Move
the work if
practicable,
to
an area
free of combustibles.
Avoid
paint
spray
rooms,
dip
tanks, storage
areas,
verdi
lators. if the work
cannot
be
moved,
move
combustibles
at
least 35 feet
away
out
of reach of
sparks
and
heat;
or
protect
against Ignition
with suitable and
snug-fitting,
fire-resistant
covers or
shields.
Walls
touching
combustibles
on
opposite
sides should
not
be welded
on
(or cut).
Walls,
ceilings,
and floor
near
work should be
protected by
heat-resistant
covers or
shields.
Fire watcher
must
be
standing by
with
suitable fire extin
guishing equipment during
and for
some
time afterweld
ing
or
cutting
if:
a.
appreciable
combustibles
(including building
construction)
are
within 35 feet
b.
appreciable
combustibles
are
further than 35
feet but
can
be
ignited by sparks
c.
openings (concealed orvisible)
In floors orwalls
within 35 feet
may expose combustibles
to
sparks
d.
combustibles
adjacent
to
walls,
ceilings,
roofs,
or
metal
partitions
can
be
ignited by
radiant
or
conducted heat.
Hot work
permit
should be obtained before
operation
to
ensure
supervisors approval
that
adequate precautions
have been taken.
After work is
done,
check that
area
is free of
sparks,
glowing
embers,
and flames.
An
empty
container that held
corrtustibles,
or
that
can
produce
flammable
or
toxic vapors when
heated,
must
never
be welded
on or
cut, unless container has first
been cleaned
as
described in
AWS Standard
A6.O,
listed
7 in
Standards
Index.
This includes:
a
thorough
steam
or
caustic
cleaning
(or
a
solvent
orwaterwashing, depending
on
the combusti
bles
solubility)
followed
by purging
and
inerting
with ni
trogen
or
carbon
dioxide,
and
using protective equip
ment
as
recommended in A6.O.
Waterfilling just
below.
working
level may substitute for
inerting.
A container with unknown contents should be
cleaned
(see preceding paragraph).
Do NOT
depend
on sense
of smell
or
sight
to
determine if it is safe
to
weld
or
cut.
Hollow
castings
or
containers
must
be vented before
welding
or
cutting. They
can
explode.
Explosive atmospheres.
Never weld
or
cut
where the air
may contain flammable
dust,
gas,
or
liquid
vapors
(such
as
gasoline).
D.
Compressed
Gas
Equipment
Standard
precautions. Comply
with
precautions
in this
manual,
and those detailed
in
CGA Standard
P-i
,
SAFE
HANDLING OF COMPRESSED GASES
IN
CYLIN
DERS,
listed
ii in
Standards Index.
i.
Pressure
Regulators
Regulator
relief valve is
designed
to
protect
only
the
regulator
from overpressure; it is
not
intended
to
protect
any downstream
equipment.
Provide such
protection
with
one or more
relief devices.
Never
connect
a
regulator
to
a
cylinder containing
gas
other than that for which the
regulator
was
designed.
Remove
faulty regulator
from service
immediately
for
repair (first
close
cylinder valve).
The
following
symp
toms
indicate
a
faulty regulator:
Leaks-if
gas
leaks
externally.
Excessive
Creep-if delivery
pressure continues
to
rise
with downstream valve closed.
Faulty Gauge-if
gauge
pointer
does
not
move
off
stop
pin
when
pressurized,
nor
returns to
stop pin
after pres
sure
release.
Repair.
Do NOT
attempt
to
repair.
Send
faulty regula
tors
for
repair
to
manufacturers
designated repair
cen
ter,
where
special techniques
and tools
are
used
by
trained
personnel.
2.
Cylinders
Cylinders
must
be handled
carefully
to
prevent
leaks
and
damage
to
their
walls, valves,
or
safety
devices:
Avoid electrical circuit
contact
with
cylinders including
third
rails,
electrical
wires,
or
welding
circuits.
They
can
produce
short circuit
arcs
that may lead
to
a
serious
ac
cident.
(See
1
-3C.)
ICC
or
DOT
marking
must
be
on
each
cylinder.
It is
an
assurance
of
safety
when the
cylinder
is
properly
han
dled.
Identifying
gas
content.
Use
only cylinders
with
name
of
gas marked
on
them;
do
not
rely
on
color
to
identify
gas
content.
Notify supplier
if
unmarked. NEVER DEFACE
or
alter
name,
number,
or
other
markings
on a
cylinder.
It is
illegal
and hazardous.
F2544
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