MK Products COBRAMIG 300, Owner'S Manual, Page: 4 / 36

Cobra
®
MX Owner's Manual -
Page ii
CobraMig
® 300
Owner's Manual - Page II
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 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
manufacturer’s 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
produced short circuit arcs that may lead
to a serious accident. (See 1-3C)
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 content. 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 stuck.
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 magnets.
Do NOT expose cylinders to excessive
heat, sparks, slag, and flame, etc. that
may cause rupture. Do not allow contents
to exceed 55 degrees C (130 degrees
F.) 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
cannot be opened by hand. Notify your
supplier.
Mixing gases. NEVER try to mix any
gases in a cylinder.
NEVER refill any cylinder.
Cylinder fittings 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
otherwise 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 connections. Immerse
pressured hose in water; bubbles
indicate leaks
Repair leaky or worn hose by cutting area
out and splicing. 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,
lintless 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 Connect a regulator designed
for a particular gas or gases to a cylinder
containing any other gas.
Tighten connections. When assembling
threaded connections, clean and smooth
seats where necessary. Tighten. If
connection 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 pressurization. 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 increases slowly.
When gauge is pressurized (gauge
reaches regulator 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
emergency shut-off.
Use pressure charts (available from
your supplier) for safe and efficient
recommended pressure settings on
regulators.
Check for leaks on first pressurization
and regularly thereafter. Brush with soap
solution. Bubbles indicate leaks. Clean
off soapy water after test; dried soap is
combustible.
E. User Responsibilities
Follow all Safety Rules.
Remove leaky or defective equipment
from service immediately for repair. Read
and follow user manual instructions.
F. Leaving Equipment Unattended
Close gas supply at source and drain gas.
G. Rope Staging-Support
Rope staging-support should not be used
for welding or cutting operation; rope
may burn.
1-3 ARC WELDING
Comply with precautions in 1-1, 1-2, and
this section. Arc Welding, properly done,
is a safe process, but a careless operator
invites trouble. The equipment carries
high currents at significant voltages.
The arc is very bright and hot. Sparks
fly, fumes rise, ultraviolet and infrared
energy radiates, weldments are hot, and
compressed gases may be used. The
wise operator avoids unnecessary risks
and protects himself and others from
accidents.
A. Burn Protection
Comply with precautions in 1-2.
The welding arc is intense and visibly
bright. Its radiation can damage eyes,
penetrate lightweight clothing, reflect
from light-colored surfaces, and burn
the skin and eyes. Skin burns resemble
acute sunburn; those from gas-shielded
arcs are more severe and painful.
DON’T GET BURNED; COMPLY WITH
PRECAUTIONS.
1. Protective Clothing
Wear long-sleeve clothing in addition to
gloves, hat, and shoes. As necessary,
use additional protective clothing such