(A) Reserved.
(B) Reserved.
(C) Responsibility.
(1) The employer
shall
will verbally
and through demonstration instruct the employee in the safe operation and
maintenance of cutting and welding equipment.
(2) It
shall
be
is the duty of the employee to
operate such equipment in accordance with such instructions.
(D) Maximum pressure.
Under no condition will acetylene be generated, piped (except
in approved cylinder manifolds), or utilized at a pressure in excess of fifteen
pounds per square inch gauge pressure.
(E) Gas welding and cutting.
(1) Equipment.
Only approved equipment, such as torches, regulators, or
pressure-reducing valves, acetylene generators, manifolds, cylinders, and
containers shall
will be used.
(2) Cylinders and containers.
(a) Marking.
Compressed gas cylinders shall
will be legibly
marked, for the purpose of identifying the gas content, with either the
chemical or the trade name of the gas. Such marking shall
will be by
means of stenciling, stamping, or labeling and shall
will not be
readily removed.
(b)
Storage.
(i) Oxygen cylinders in storage
shall
will be
separated from fuel-gas cylinders or combustible materials (especially oil or
grease), a minimum distance of twenty feet or by a noncombustible barrier at
least five feet high, having a fire resistance rating of at least one-half
hour.
(ii) Cylinders, when not in
use,
shall
will be protected from any heat-radiating objects or
open flame which could cause the cylinders to rupture or could cause the
fusible plug to melt.
(c) Valve protection caps.
(i) All cylinders with a water weight
capacity of over thirty pounds
shall
will be equipped with means of connecting a valve
protection cap or with a collar or recess to protect the valve.
(ii) Employees
shall
will be
responsible for using valve protection caps when cylinders are moved from place
to place or put in storage.
(iii)
Where carriers are provided for moving cylinders which are connected for use,
capping
shall
will not be required but employees
shall
will be
responsible for seeing that cylinder valves are closed and pressure is released
from regulators, hoses and torches.
(d) Regulator protection.
Welders and cutters shall
will be instructed to close valves on oxygen and
acetylene cylinders and bleed off hose pressure at the end of each workshift,
to prevent malfunction of the regulators.
(e) Transporting cylinders by crane or
derrick.
When cylinders are hoisted, they shall
will be secured
on a cradle, slingboard, or pallet. They shall
will not be
hoisted or transported by means of magnets or choker slings.
(f) Facilities for securely fastening
cylinders; responsibility.
The employer shall
will provide facilities for securely fastening
cylinders of compressed gas in an upright position.
(3) Hose and hose connections.
(a) Hose.
(i) Identification.
The color red shall
will be used for acetylene and other fuel gas
hose. The color green shall
will be used for oxygen hose. The color black
shall
will be
used for inert gas and air hose.
(ii) Hose in which flashback has occurred.
Any length of hose in which a flashback has occurred and burned
in the hose shall
will be taken out of service. Flash-back protection
shall
will be
provided by an approved device that will prevent flame from passing into the
fuel-gas system.
(iii)
Single hose with more than one gas passage.
The use of a single hose having more than one gas passage, in
which a wall failure would permit the flow of one gas into the other gas
passage, shall
is not be
permitted.
(iv) Hoses taped
together - limitation.
When parallel lengths of oxygen and acetylene hoses are taped
together for convenience and to prevent tangling, not more than four inches out
of twelve inches shall
will be covered by tape.
(v) Damaged or defective hose.
Hose showing leaks, burns, worn places, or other defects
rendering it unfit for service shall
will have the damaged portion removed, repaired
or replaced.
(b)
Hose connections and couplings.
(i) Hose
connections for oxygen and fuel gas
shall
will be distinguished from each other. Hose
connections
shall
will be clamped or otherwise securely fastened in a
manner that will withstand, without leakage, twice the pressure to which they
are normally subjected in service, but in no case less than three hundred
pounds per square inch.
(ii) Hose
couplings
shall
will be of the type that cannot be unlocked or
disconnected by means of a straight pull without rotary motion.
(c) Pressure reducing regulators.
(i) Oxygen and fuel gas pressure regulators,
including their related gauges,
shall
will be in proper working order while in
use.
(ii) Pressure-reducing
regulators
shall
will be used only for the gas and pressures for which
they are intended.
(F) Electric welding.
(1) Approved equipment.
Only approved electric welding equipment
shall
will be
used.
(2) Design.
No connections for portable control devices such as push
buttons to be carried by the operator shall
will be connected to an alternating current
circuit of higher than one hundred twenty volts. Exposed metal parts of
portable control devices operating on circuits above fifty volts
shall
will be
grounded by a grounding conductor in the control cable.
(3) Installation of arc welding equipment.
Installation, including power supply,
shall
will be
in accordance with the manufacturer's specifications.
(a) The frame or case of the welding machine
(except engine-driven machines)
shall
will be grounded under the conditions and
according to the manufacturer's specifications.
(b) Supply.
(i) All direct current machines
shall
will be
connected with the same polarity.
(ii) All alternating current machines
shall
will be
connected to the same phase of the supply circuit and with the same
instantaneous polarity.
(c) Switches.
Proper switching equipment for shutting down the machine
shall
will be
provided.
(4)
Electrode holders.
(a) Insulation. Electrode
holders shall be insulated to protect the operator against shock.
(b) When not in use.
Electrode holders when not in use shall
will be so
placed that they cannot make electrical contact with persons, conducting
objects, fuel or compressed gas tanks.
(c) Cables with splices.
Cables with splices within ten feet of the holder
shall
will
not be used.
(5)
Maintenance.
(a) Defective equipment.
The operator shall
will report any equipment or defect or safety
hazard to his supervisor and the use of the equipment
shall
will be
discontinued until its safety has been assured. Repairs
shall
will be
made only by authorized qualified personnel.
(b) Cables.
Cables with damaged insulation or exposed bare conductors
shall
will be
replaced. Joining lengths of work and electrode cables
shall
will be
done by the use of connecting means specifically intended for the purpose. The
connecting means shall
will have insulation adequate for the service
conditions.
(6)
Installation and operation of resistance welding equipment.
(a) Thermal protection.
Ignition tubes used in resistance welding equipment
shall
will be
equipped with a thermal protection switch.
(b) Guarding.
Controls of all automatic or air and hydraulic clamps
shall
will be
arranged or guarded to prevent the operator from accidentally activating
them.
(c) Spot and seam
welding machines (nonportable).
(i) Voltage.
All external weld initiating control circuits
shall
will
operate on low voltage, not over one hundred twenty volts.
(ii) Capacitor welding.
Stored energy or capacitor discharge type of resistance welding
equipment and control panels involving high voltage (over five hundred fifty
volts) shall
will be insulated and protected by complete
enclosures, all doors of which shall
will be provided with interlocks and contacts
wired into the control circuit (similar to elevator interlocks). Such
interlocks or contacts shall
will be so designed as to interrupt power and
short circuit all capacitors when the door or panel is open. A manually
operated switch or positive device shall
will be installed, in addition to the mechanical
interlocks or contacts, as an added safety measure assuring absolute discharge
of all capacitors.
(iii)
Interlocks.
All doors and access panels of all resistance welding machines
and control panels shall
will be kept locked and interlocked to prevent
access by unauthorized employees, to live portions of the equipment.
(iv) Guarding.
All press welding machine operations, where there is a
possibility of the operator's fingers being under the point of operation,
shall
will be
guarded by the use of a device such as an electronic eye safety circuit,
two-hand controls or protection similar to that prescribed for power press
operations (see rule
4123:1-5-10 of the
Administrative Code).
(v)
Disengaging from power supply.
Means shall
will be provided at each machine, within easy
reach of the operator, for disengaging it from its power supply. This
shall
does
not apply to rolling departments of iron and steel mills nor to electrical
power generation or conversion equipment.
(vi) Safety blocks or pins.
The employer shall
will provide and enforce the use of safety blocks
or pins so that whenever safety blocks or pins are inserted in the platen or
ram, the press becomes inoperative.
(vii) Grounding.
The secondary of all welding transformers used in multi-spot,
projection, and seam welding machines shall
will be grounded. This may be done by permanently
grounding one side of the welding secondary current circuit, or a center tapped
grounding reactor connected across the secondary or the use of a safety
disconnect switch in conjunction with the welding control are acceptable
alternatives. Safety disconnect shall
will be arranged to open both sides of the line
when welding current is not present.
(d) Portable welding machines.
(i) Counterbalance.
All portable welding guns shall
will have
counterbalancing devices for supporting the gun unless the design of the gun
makes counterbalancing unnecessary.
(ii) Safety chains.
All portable welding guns, transformers and related equipment
that is suspended from overhead structures, I-beams, trolleys, etc.,
shall
will be
equipped with safety chains or cables. Safety chains or cables
shall
will be
capable of supporting the total shock load in the event of failure of any
component of the supporting system.
(iii) Clevis.
When trolleys are used to support portable welding equipment,
with a forged steel clevis for the attachment of safety chains, each clevis
shall
will be
capable of supporting the total shock load of the suspended equipment in the
event of trolley failure.
(iv) Switch guards.
All initiating switches located on the portable welding gun
shall
will be
equipped with guards capable of preventing accidental initiation through
contact with fixturing, operator's clothing, etc. Initiating switch voltage
shall
will
not exceed twenty-four volts.
(v) Grounding.
The secondary and the case of all portable welding transformers
shall be grounded. Secondary grounding shall be by:
(a) Center tapped secondary, or
(b) A center tapped grounding reactor
connected across the secondary.
(vi) Butt (flash) welding equipment.
Butt welding machines shall
will be equipped with a hood to control flying
flash. In cases of high production, where materials may contain a film of oil
and where toxic elements and metal fumes are given off, ventilation
shall
will be
provided in accordance with rule
4123:1-5-18 of the
Administrative Code.
(7) Welding or cutting of containers.
No welding, cutting, or work utilizing a torch
shall
will be
performed on used drums, barrels, tanks, or other containers until they have
been cleaned and purged of materials which when subjected to heat might produce
flammable or toxic vapors.
(8) Eye and ear protection.
See rule
4123:1-5-17 of the
Administrative Code, "Personal protective
equipment."
(G)
Protection from sparks or falling objects.
(1)
Cutting or welding
shall
will be permitted only in areas that are or have
been made fire safe.
(2) Screens or
shields
shall
will be provided for the protection of employees or
combustible materials exposed to sparks or falling objects.
Notes
Ohio Admin. Code 4123:1-5-16
Effective:
6/30/2023
Five Year Review (FYR) Dates:
2/1/2027
Promulgated Under:
119.03
Statutory Authority: 4121.12, 4121.121, 4121.13
Rule Amplifies: 4121.47
Prior Effective Dates:
04/01/1964, 08/01/1977, 04/01/1999, 04/10/2011,
02/01/2022