Miller A-500 Owner's Manual - Page 6
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This
includes:
a
thorough
steam
or
caustic
cleaning
(or
a
solvent
or
water
washing, depending
on
the
combustibles
solubility(
followed
by
purging
and
inerting
with
nitrogen
or
carbon
dioxide,
and
using protective equipment
as
recom
mended
in
AGO.
Waterfilling just
below
working
level
may
substitute for
inerting.
A
container
with
unknown
content
should be cleaned
(see
paragraph
above(.
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
gaso
Iine(.
D.
Compressed
Gas
Equipment
Standard
precautions.
Comply
with
precautions
in
this
manual,
and those detailed in CGA
Standard
P-i,
PRECAU
TIONS FOR SAFE HANDLING OF COMPRESSED GASES
IN
CYLINDERS,
listed 6 in Standards index,
1.
Pressure
Regulators
Regulator
relief
valve
is
designed
to
protect
only
the
regula
tor
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
symptoms
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
pressure
release
-
Repair.
Do NOT attempt
repair.
Send
faulty regulators
for
repair
to
manufacturers
designated repair
center,
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 accident.
(See
i-3C.(
ICC
or
DOT
marking
must
be
on
each
cylinder.
It
is
an
assurance
of
safety
when the
cylinder
is
properly
handled.
Identifying
gas
content
Use
only cylinders
with
name
of gas
marked
on
them;
do
not
rely
on
color
to
identify
gas
con
tent.
Notify supplier
if unmarked. NEVER
DEFACE
or
alter
name,
number,
or
other
markings
on
a
cylinder.
It
is
illegal
and hazardous.
Empties: Keep
valves
closed, replace
caps
securely;
mark
MT;
keep
them separate from FULLS and
return
promptly.
Prohibited
use.
Never
use
a
cylinder
or
its
contents
for other
than its
intended
use,
NEVER
as
a
support
or
roller.
Locate
or
secure
cylinders
so
they
cannot
be knocked
over.
Passageways
and work
areas.
Keep cylinders
clear of
areas
where
they
may be struck.
Transporting
cylinders.
With
a
crane,
use
a
secure
support
such
as
a
platform
or
cradle. Do NOT lift
cylinders
off the
ground
by
their valves
or
caps,
or
by chains,
slings,
or
mag
nets.
Do NOT expose
cylinders
to
excessive
heat, sparks, slag,
and
flame,
etc.
that may
cause
rupture.
Do
not
allow
contents
to
exceed
i30F.
Cool with
water
spray where such exposure
exists.
Protect
cylinders particularly
valves from
bumps,
falls,
falling
objects,
and weather.
Replace
caps
securely
when
moving
cylinders.
Stuck
valve.
Do NOT
use
a
hammer
or
wrench
to
open
a
cylinder
valve that
can
not
be
opened by
hand.
Notify
your
supplier.
Mixing
gases. Never try
to
mix any
gases in
a
cylinder.
Never refill any
cylinder.
Cylinder fittin~
should
never
be modified
or
exchanged.
3.
Hose
Prohibited
use.
Never
use
hose
other
than that
designed
for
the
specified
gas. A
general
hose identification rule is: red for
fuel gas, green for oxygen, and black for inert gases.
Use ferrules
or
clamps designed
for the hose
(not ordinary
wire
or
other
substitute(
as
a
binding
to connect
hoses
to
fittings.
No
copper
tubing splices.
Use
only
standard brass
fittings
to
splice
hose.
Avoid
long
runs
to
prevent kinks and abuse.
Suspend
hose off
ground
to
keep
it from
being
run
over,
stepped
on,
or
other
wise
damaged.
Coil
excess
hose
to
prevent
kinks and
tangles.
Protect
hose
from
damage by sharp edges,
and
by sparks,
slag,
and open flame.
Examine hose
regularly
for
leaks,
wear,
and loose
connec
tions.
Immerse
pressured
hose
in
water;
bubbles indicate
leaks.
Repair leaky
or
worn
hose
by
cutting
area
out
and
splicing
(i-2D3(.
Do NOT
use
tape.
4.
Proper
Connections
Clean
cylinder
valve
outlet
of
impurities
that
may.
clog
orifices and
damage
seats
before
connecting regulator. Except
for
hydrogen,
crack valve
momentarily, pointing
outlet
away
from
people
and
sources
of
ignition. Wipe
with
a
clean lint-
less
cloth.
Match
regulator
to
cylinder.
Before
connecting,
check that
the
regulator
label and
cylinder
marking
agree, and that the
regulator
inlet
and
cylinder
outlet match.
NEVER CON
NECT
a
regulator designed
for
a
particular
gas
or
gases
to
a
cylindercontaining
any
other gas.
Tighten
connections. When
assembling
threaded
connections,
clean and smooth
seats
where
necessary.
Tighten.
If
connec
tion
leaks, disassemble, clean,
and
retighten
using properly
fitting
wrench.
Adapters.
Use
a
CGA
adapter (available
from your
supplier(
between
cylinder
and
regulator,
if
one
is
required.
Use
two
wrenches
to
tighten
adapter
marked
RIGHT and
LEFT
HAND threads.
Regulator
outlet
(or hose(
connections
may
be
identified
by
right
hand threads for oxygen and left
hand threads
(with
grooved
hex
on
nut
or
shank(
for fuel gas.
5.
Pressurizing Steps:
Drain
regulator
of residual gas
through
suitable
vent
before
opening cylinder
(or manifold valve)
by turning adjusting
screw
in
(clockwise(.
Draining
prevents excessive
compression
heat
at
high
pressure
seat
by allowing
seat to
open
on
pressur
ization. Leave
adjusting
screw
engaged slightly
on
single-stage
regulators.
Stand
to
side of
regulator
while
opening cylinder
valve.
Open cylinder
valve
slowly
so
that
regulator
pressure
in
creases
slowly.
When gauge is
pressurized
(gauge
reaches regu
lator
maximum(
leave
cylinder
valve in
following
position:
For oxygen, and inert gases, open
fully
to
seal
stem
against
possible
leak.
For fuel
gas,
open
to
less than
one
turn
to
permit quick
emer~ency shutoff.
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