MK Products Cobra System III Gooseneck - Manual (Page 3)

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 as leather jacket or sleeves, flameproof apron, and
fire-resistant leggings. Avoid outer garments of untreated
cotton.
Bare skin protection. Wear dark, substantial clothing.
Button collar to protect chest and neck, and button
pockets to prevent entry of sparks.
2. Eye and Head Protection
Protect eyes from exposure to arc. Eyes may be damaged
by radiant energy when exposed to the electric arc, even
when not looking in the direction of the arc. Never look
at an electric arc without protection.
Welding helmet or shield containing a filter plate shade
no. 12 or denser must be used when welding. Place over
face before striking arc.
Protect filter plate with a clear cover plate.
Cracked or broken helmet or shield should NOT be worn;
radiation can be passed through to cause burns.
Cracked, broken, or loose filter plates must be replaced
IMMEDIATELY. Replace clear cover plate when broken,
pitted, or spattered.
Flash goggles with side shields MUST be worn under the
helmet to give some protection to the eyes should the
helmet not be lowered over the face before an arc is
struck. Looking at an arc momentarily with unprotected
eyes (particularly a high intensity gas-shielded arc) can
cause a retinal burn that may leave a permanent dark
area in the field of vision.
3. Protection of Nearby Personnel
Enclose the welding area. For production welding, a
separate room or enclosed bay is best. In open areas,
surround the operation with low-reflective, noncombustible
screens or panels. Allow for free air circulation, particularly
at floor level.
Viewing the weld. Provide face shields for all persons
who will be looking directly at the weld.
Others working in area. See that all persons are wearing
flash goggles.
Before starting to weld, make sure that screen flaps or
bay doors are closed.
B. Toxic Fume Prevention
Comply with precautions in 1-2B.
Generator engine exhaust must be vented to the outside
air. Carbon monoxide can kill.
C. Fire and Explosion Prevention
Comply with precautions in 1-2C.
Equipment’s rated capacity. Do not overload arc welding
equipment. It may overheat cables and cause a fire.
Loose cable connections may overheat or flash and
cause afire.
Never strike an arc on a cylinder or other pressure vessel.
It creates a brittle area that can cause a violent rupture or
lead to such a rupture later under rough handling.
D. Compressed Gas Equipment
Comply with precautions in 1-2D.
E. Shock Prevention
Exposed electrically hot conductors or other bare metal
in the welding circuit, or in ungrounded, electrically-HOT
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