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Instructions for
C-67 MACHINE CUTTING TORCHES
These instructions are for experienced operators. If you are not fully familiar with the principles of operation and safe practices
for oxy-fuel gas equipment, we urge you to read our booklet “Precautions and Safe Practices for Gas Welding, Cutting, and
Heating”, Form 2035. Do NOT permit untrained persons to operate this equipment. Do NOT attempt to operate this equipment
until you have read and fully understand these instructions. If you do not fully understand these Instructions, contact your
supplier for further information.
The cutting torches covered by these instructions are listed by Underwriter's Laboratories only when using cutting nozzles
and parts manufactured by the ESAB Welding & Cutting Products to the specifications on file with Underwriter's Laboratories,
Inc., and when they are used in the gas service for which they are designed and listed. The use of other parts that cause
damage or failure to the equipment will void the manufacturer's warranty.
C-67-20-I
F11-062-U
May, 2006
C-67-20-II
C-67-20-III
C-67-12-II
LPHC
Note: For listing of C-67 torches made for special
customer orders, see page 6.
*For explanation, see Introduction.
INTRODUCTION
The C-67 machine cutting torches are designed for use
with any fuel gas such as FG-2 and other propylene
gases, natural gas, propane, MAPP, etc. but NOT for
acetylene. DO NOT USE C-67 TORCH WITH
ACETYLENE.
The C-67-1400 torches have three-hose connections for
independent supply of cutting oxygen, preheat oxygen,
and fuel gas. They are equipped with valves. All have 13/8-in. diameter casing and are equipped with 32-pitch
rack for use with any ESAB cutting machine.
N / A
LLPMC Injector Type I — low, pressure, medium
capacity for cutting up to 8-in. thick steel at any usable fuel
gas pressure from near zero psig on up. This injector is
best suited for multi-torch operation since it is very
insensitive to manifold pressure changes resulting from
changing the number of torches in use.
LPHC Injector Type II — low pressure, high capacity for
cutting up to 20-in. thick steel at any usable fuel gas
pressure from 3 psig on up. This injector is recommended
for heavy preheat applications such as beveling, auxiliary
preheat, etc, It is not recommended for use in multi-torch
operation.
The capability of the torch depends on the type of injector
installed in the torch. Each torch listed in Table 1 is
equipped with a particular injector. Table 2 lists interchangeable injectors which are available as accessories. The injectors are defined as follows:
Be sure this information reaches the operator.
You can get extra copies through your supplier.
LPMC Injector Type III — low, pressure, medium
capacity for cutting up to 14-in. thick steel at any usable
fuel gas pressure from one psig on up. This injector can
provide a heavier preheat than the LLPMC injector and it
is slightly sensitive to pressure changes in a multi-torch
operation.
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SAFETY PRECAUTIONS
These Safety Precautions are for your protection. They summarize precautionary information from the references listed
in Additional Safety Information section. Before performing any
installation or operating procedures, be sure to read and follow the safety precautions listed below as well as all other
manuals, material safety data sheets, labels, etc. Failure to observe Safety Precautions can result in injury or death.
PROTECT YOURSELF AND OTHERS - Some
welding, cutting and gouging processes are
noisy and require ear protection. Hot metal can
cause skin burns and heat rays may injure
eyes. Training in the proper use of the processes and equipment is essential to prevent
accidents. Also:
1. Always wear safety glasses with side shields in any work area,
even if welding helmets, face shields, or goggles are also required.
2. Wear flameproof gauntlet type gloves, heavy long-sleeve shirt,
cuffless trousers, high-topped shoes, and a welding helmet or
cap for hair protection, to protect against hot sparks and hot
metal. A flameproof apron may also be desirable as protection
against radiated heat and sparks.
3. Hot sparks or metal can lodge in rolled up sleeves, trousers
cuffs, or pockets. Sleeves and collars should be kept buttoned,
and open pockets eliminated from the front of clothing.
4. Protect other personnel from hot sparks with a suitable nonflammable partition or curtains.
5. Use goggles over safety glasses when chipping slag or grinding. Chipped slag may be hot and can travel considerable distances. Bystanders should also wear goggles over safety
glasses.
FIRES AND EXPLOSIONS - Heat from a flame
can act as an ignition source. Hot slag or sparks
can also cause fires or explosions. Therefore:
1. Remove all combustible materials well away from the work
area or completely cover the materials with a protective nonflammable covering. Combustible materials include wood,
cloth, sawdust, liquid and gas fuels, solvents, paints and coatings, paper, etc.
2. Hot sparks or hot metal can fall through cracks or crevices in
floors or wall openings and cause a hidden smoldering fire on
the floor below. Make certain that such openings are protected
from hot sparks and metal.
3. Do not weld, cut, or perform any other hot work on materials,
containers, or piping until it has been completely cleaned so
that no substances on the material can produce flammable or
toxic vapors. Do not do hot work on closed containers. They
may explode.
4. Have fire extinguishing equipment handy for instant use, such
as a garden hose, a pail of water or sand, or portable fire
extinguisher. Be sure you are trained in its use.
5. After completing operations, inspect the work area to be sure
that there are no hot sparks or hot metal which could cause a
later fire. Use fire watchers when necessary.
6. For additional information, refer to NFPA Standard 51B, “Fire
Prevention in Use of Cutting and Welding Processes”, which
is available from the National Fire Protection Association,
Batterymarch Park, Quincy, MA 02269.
FUMES AND GASES - Fumes and gases, particularly in confined spaces, can cause discomfort or injury. Do not breathe fumes or
gases from welding or cutting, Therefore:
1. Always provide adequate ventilation in the work area by natural or mechanical ventilation means. Do not weld, cut, or gouge
on materials such as galvanized steel, stainless steel, copper,
zinc, lead, beryllium, or cadmium unless positive mechanical
ventilation is provided. Do not breathe fumes and gases from
these materials.
2. If you develop momentary eye, nose, or throat irritation while
operating, this is an indication that ventilation is not adequate.
Stop work at once and take necessary steps to improve ventilation in the work area. Do not continue to operate if physical
discomfort persists.
3. Refer to ANSI/ASC Standard Z49.1 listed below for specific
ventilation recommendations.
4. WARNING: This product, when used for welding or
1. Always have qualified personnel perform the installation,
troubleshooting, and maintenance work. Do not operate or
repair any equipment unless you are qualified to do so.
2. Keep all oxy-fuel equipment free of grease or oil. Grease, oil,
and other similar combustible materials, when ignited, can burn
violently in the presence of oxygen.
3. Do not abuse any equipment or accessories. Keep equipment
away from heat and wet conditions, oil or grease, corrosive
atmospheres and inclement weather.
4. Keep all safety devices in position and in good repair.
5. Use equipment for its intended purpose. Do not modify it in
any manner.
1. Use the proper gas for the process and use the proper pressure reducing regulator designed to operate from the compressed gas cylinder. Do not use adaptors to mount the regulator on the cylinder. Maintain hoses and fittings in good condition. Follow manufacturer’s operating instructions for mounting the regulator to the gas cylinder.
2. Always secure cylinders in an upright position by chain or strap
to suitable hand trucks, benches, walls, post, or racks. Never
secure cylinders to work tables or fixtures where they may
become part of an electrical circuit.
3. When not in use, keep cylinder valves closed. Have the valve
protection cap in place on top of the cylinder if no regulators is
installed. Secure and move cylinders by using suitable hand
trucks. Avoid rough handling of cylinders.
4. Locate cylinders away from heat, sparks, or flame of a welding, cutting, or gouging operation. Never strike an arc on a
cylinder.
5. For additional information, refer to CGA Standard P-1, “Precautions for Safe Handling of Compressed Gases in Cylinders:, which is available from the Compressed Gas Association, 1235 Jefferson Davis Highway, Arlington, VA 22202.
The following publications, which are available from the American
Welding Society, 550 N.W. LeJuene Road, Miami, FL 33126, are
recommended to you:
1. ANSI/AWS Z49.1 - “Safety in Welding and Cutting”.
2. AWS F4.1 - “Recommended Safe Practices for the Preparation for Welding and Cutting of Containers and Piping That
Have Held Hazardous Substances”/
3. AWS SP - “Safe Practices” - Reprint, Welding Handbook.
cutting, produces fumes or gases which
contain chemicals known to the State of
California to cause birth defects and, in
some cases, cancer. (California Health &
Safety Code §25249.5 et seq.)
EQUIPMENT MAINTENANCE - Faulty or improperly maintained equipment, such as torches, hoses
and regulators, can result in poor work, but even
more important, it can cause injury or death
through fires. Therefore:
GAS CYLINDER HANDLING - Gas cylinders, if mishandled, can rupture or explode violently. Sudden
rupture of a cylinder, valve or relief device can injure or kill you. Therefore:
ADDITIONAL SAFETY INFORMATION - For more
information on safe practices for oxy-fuel welding
and cutting equipment, ask your distributor for a
copy of “Precautions and Safe Practices for Gas
Welding, Cutting, and Heating”, Form 2035. Gas
apparatus safety guidelines are also available on
video cassettes from your distributor.
MEANING OF SYMBOLS - As used throughout
this manual: Means Attention! Be Alert! Your
safety is involved.
Means immediate hazards which, if not avoided,
will result in immediate, serious personal in-
jury or loss of life.
Means potential hazards which could result in
personal injury or loss of life.
Means hazards which could result in minor
personal injury.
2
SP-GA 10/98
Page 3
OPERATING INSTRUCTIONS
CONNECTING
1. Follow all instructions supplied with the regulators.
Attach one regulator for cutting oxygen supply, one for
preheat oxygen, and one for fuel gas.
NOTE: If gas is being supplied from a pipeline, a check
valve or a hydraulic must be installed between
pipeline shut-off valve and torch (Ref: National
Fire Protection Association Standard No. 51.)
2. Attach hoses from each regulator to the proper connections on the torch (the green oxygen hoses have
right-hand threaded nuts and the red fuel gas connection nuts are left-handed). Tighten all connection nuts
with a wrench.
3. Attach nozzle to torch head, and tighten nozzle nut
with a wrench.
4. Check throttle valve packing nuts for tightness.
Flashbacks can cause serious burns.
Be sure gas flow is sufficient for head or nozzle size.
Adjust regulators for proper psig pressures.
Adjust throttle valves properly.
Keep torch in good repair.
DO NOT throttle back gases to use large head or nozzle
on thin material.
ADJUSTING GAS PRESSURES
Fuel Gas: If fuel gas is supplied from a station outlet
through a check valve or hydraulic, merely open the
station valve. If fuel gas is being supplied through a
station or cylinder regulator, open the fuel gas valve on
the torch, turn in the pressure-adjusting screw on the
regulator until the regulator delivery-pressure gauge
indicates the desired pressure. (See operating data on
page 3.) Then close the cutting oxygen valve.
Repeat procedure with the preheat oxygen.
NOTE: When gaugeless regulators are used, do not
open torch valves. Merely turn in the pressureadjusting screws to desired pressures as indicated on the scales of regulator caps.
tions, the regulator-to-hose connections, and the hose-totorch connections. If bubbling at any point indicates
leakage, tighten the connection. If this does not stop the
leakage, close the appropriate cylinder valve, open the
torch valve to remove all pressure from the line, and
finally release the regulator pressure-adjusting screw by
turning it counterclockwise. Then break the leaky connection, wipe metal seating surfaces with a clean, dry
cloth, and examine them for nicks and scratches.
Remake the connection(s) and retest. Do not try to light
the torch until you are satisfied that all connections are
gas-tight.
After lighting the torch, and adjusting the flames, use leak
test solution to check for leakage at all torch valves.
LIGHTING AND FLAME ADJUSTMENT
Open the preheat valve wide (two turns). Open the fuel
gas valve about one turn. Light the gas at the nozzle with
a friction lighter. Then open the cutting oxygen valve and
adjust flames with the fuel gas valve. The hottest flames
are obtained when the inner cones are as short as
possible. Do not throttle the preheat oxygen valve unless
flames blow off, or burn away from the nozzle.
NOTE: Because of the several factors involved (injector
nozzle size, gas pressures) the adjustment procedures given above do not apply in all situations. However, this is a good rule-of-thumb if
you want preheat flames of maximum effectiveness: you should usually be able to keep one
preheat valve wide open if regulator oxygen
pressure has been set correctly for the nozzle in
use.
SHUTTING OFF
Close the cutting oxygen valve. Then close the fuel gas
valve, and finally the preheat oxygen valve.
If operations are to be stopped for a half-hour or more, all
pressure should be released from the torch, hoses, and
regulators by doing the following:
1. Close each cylinder or station valve.
2. Open torch valves.
3. After relieving the gases, back out the pressureadjusting screw of each regulator and close the torch
valves.
TESTING FOR LEAKS
Every welding and cutting outfit should be thoroughly
tested for leaks after it is first hooked up, and at regular
intervals thereafter. After all connections have been
made, make sure all valves on the torch handle are
closed. Then turn in the pressure adjusting screw on
each regulator until its delivery pressure gauge registers
a reading greater than the normal operating pressure.
Using Leak Test Solution suitable for oxygen service,
such as P/N 998771 (8 oz. container), check for leaks at
the cylinder valves, the cylinder-to-regulator connec-
OPERATING PRECAUTIONS
Flow: There must be proper flow of gases for safe
operation and full performance. This requires the following three conditions: (1) the regulators that determine
the inlet pressure to the hoses must be set to the correct
pressure: (2) the hoses and their connectors must have
adequate capacity for the job (hoses that are too long,
too small or have connectors with small passageways
can cause problems); and (3) the throttle valves on the
torch must be adjusted with the procedure shown in
these instructions.
3
(Cont. on page 5)
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OPERATING DATA
NOTES:
1. The tables show average values based on typical conditions. The type and quality of steel, its surface condition, the
purity of oxygen, etc. will always have a bearing on the end results.
2. If cutting up to 4-in. thick steel and using medium-pressure fuel gas, 1/4-in. oxygen and fuel gas hoses up to 25-ft.
long are suitable. For heavier cuts, low-pressure fuel gas or if longer hoses are required, 3/8-in. hoses are
recommended.
3. Preheat gas pressures will depend on the type injector installed in the torch. (See Introduction on cover page for
explanation and limitations of each type of injector.) Refer to Table 3A for preheat pressure settings.
4. Cutting oxygen pressure will depend on the nozzle used for the cutting operation. Refer to Table 3B, C, or D. Cutting
oxygen pressure should be measured at the torch by using test gauge adaptor, P/N 07X17.
5. Selection of nozzle external sleeve depends on the type of fuel gas used and/or process parameters.
4
Page 5
(Cont. from page 3)
Note: Items (1) and (2) can be checked by measuring
the gas pressures at the torch. Gauge adaptors
are available for this purpose.
Backfire: Improper operation of the torch may cause the
flames to go out with a loud ‘pop’. Such a backfire may be
caused by contact of nozzle with the work, by spatter
from the work, by the use of incorrect gas pressures, or
by leakage at the cutting nozzle seats due to dirt or nicks
on seats or to a loose nozzle nut.
Flashback: Under certain circumstances, the flame
may not ‘pop’ out (backfire) but instead burn back in side
the torch with a shrill hissing or squeal. This is called a
‘flashback’. A flashback should never occur if (1) the
equipment is in good condition; (2) preheat ports on
cutting nozzles or welding tips are cleaned frequently; (3)
operating pressures are correct; and (4) throttle valves
are adjusted properly. Should a flashback occur, IMMEDIATELY shut off the torch. Allow it to cool off for at least
a minute. Then check your nozzle or tip, gas pressures,
readjust regulator if necessary, and relight the torch. If
flashback recurs, send the cutting torch with nozzle to
your distributor for repair.
5
Page 6
1/8"
3/8"
1/2"
1"
4"
1/2"
1-1/2"
4"
8"
12"
MAINTENANCE INSTRUCTIONS
For all repairs other than those covered below, send the
torch to your ESAB distributor or to ESAB
Remanufacturing Center, Ebenezer Road, Florence,
S. C. 29501. Improperly repaired apparatus is hazardous.
Torch Valves: Leakage around a throttle valve can
usually be corrected by tightening the packing nut
slightly. If this does not stop the leakage, replace the
throttle valve assembly.
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Page 7
1/2"
1-1/2"
4"
8"
12"
16"
18"
20"
If a valve fails to shut off completely, remove the throttle
valve assembly from the torch. With a clean cloth, wipe
the ball in the end of the stem. Then reinsert valve
assembly and tighten it several times with maximum
force. If this does not eliminate leakage, try a new throttle
valve assembly. If then the throttle valve does not shut
off completely, send the torch to your ESAB distributor for
reseating of the body.
After installing a new throttle valve assembly, tighten the
packing nut until the valve can be turned only with great
difficulty. Set the unit aside for three or four hours at
least, to set the packing. Then back off the packing nut
until the throttle valve turns readily.
Injector: To remove the injector for inspection or replacement, first unscrew the injector chamber plug and
remove the injector spring. Then run a long No. 10-32
machine screw into the threads in the end of the injector
and withdraw the injector by pulling on the screw.
Before reinstalling a previously-used injector, be sure
that the O-rings at each end of the injector assembly are
in good condition. Replace them if necessary. Also be
sure the injector chamber plug is fitted with an O-ring in
good condition (even in cases where the plug carried no
O-ring originally).
Cleaning Cutting Nozzles: If a cutting nozzle does not
produce straight, uniform flames, or if any of the nozzle
orifices become clogged, the nozzle should be cleaned.
Use a soft bristle brush for cleaning the preheat slots on
the internal nozzles of two-piece nozzles.
For cleaning cutting oxygen orifices on the 1566 HS
series nozzles, use the non-cutting wires and tapered
reamers included in the OXWELD “HS” Nozzle Cleaning
Kit (P/N 755F00). On the 1535 series use only the
tapered cleaning tools listed in Table 3C. Do NOT use
notched type wires or twist drills on these nozzles since
any metal removal will destroy the precision cutting
characteristics.
Proper size twist drills or OXWELD tip cleaners (see
Table 3D) can be used for cleaning oxygen orifices on the
1534 series nozzles. The relationship between OXWELD
tip cleaners and drill sizes is shown on the tip cleaner
case. If using twist drills, insert carefully and push it back
and forth but DO NOT twist the drill.
For longer life, nozzles should be cleaned periodically in
a solution of OXWELD Nozzle Cleaning Compound
(P/N 761F00) made up and used as directed on the
container in which it is packed.
7
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PARTS INFORMATION
All parts which can be replaced without breaking soldered or brazed joints are illustrated and listed below.
When ordering parts, please give both part number and description (including size where appropriate). Parts
may be ordered from you ESAB distributor or from ESAB Welding & Cutting Products, Customer Service
Department, Florence, S. C.
33Y06
SPECIAL CUSTOMER ORDERS
The C-67 torches listed in Table 4 below can be
manufactured and tested by special customer request. It
may be necessary to allow a lead time of at least 60 days.
Table 4 - C-67 Torches & Injectors
Available by Special Orders
Torch Type & Part No. of
Length Part No. Injector Installed
20-1/2-in. 28X22 MPHC-01Y58
12-3/4-in. 28X34 LPMC-01Y74
28X33 MPHC-01Y73
NOTES: The special MPHC injectors should only be
used with high preheat capacity nozzles such
as the 1515 series nozzles and sizes 16 and 20
of the 1534 series nozzles.
F11-062-U 05 / 2006 Printed in U.S.A.
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