MK Products Python Rev.D - Manual (Page 3)

Python Owner's Manual Page ii
general rules cover many of the most
common situations.
1. 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 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