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5.3
SETTING THE GAS REGULATOR PRESSURES Close the regulators by turning the adjusting screws anti-clockwise to relieve the
pressure on the diaphragm before opening the cylinder valves. Slowly open the cylinder valve on the oxygen and acetylene bottles in
turn. As you do so the high pressure gauge (left hand) on each regulator will register the pressure in the cylinder to which it is attached.
5.3.1 Slowly open each regulator in turn by turning the adjusting knob clockwise. As you do so the outlet pressure gauge (right hand) on
each regulator will register the outlet pressure of gas being fed to the torch. Adjust the pressure according to the size of nozzle in use
and the thickness of the material to be cut or welded. Refer to the chart in section 7.1.
WARNING! Never set acetylene regulator at a delivery pressure above 15psi (1 bar).
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5.3.2 After adjusting the regulators to the desired operating pressures check connections for leaks using an approved leak detection solution.
Check for leaks at all connections. If a leak is found, tighten fitting more securely. If leak persists, discontinue use and call your supplier.
5.3.3 Briefly open and close the acetylene valve on the torch handle to check that the gas is flowing.
5.3.4 Ensure that the oxygen control valve on the cutting attachment is closed.
5.3.5 Fully open the oxygen control valve on the torch handle.
5.3.6 Briefly open and close the oxygen control valve on the cutting attachment to check that the gas is flowing.
5.3.7 Briefly operate the oxygen control lever on the cutting attachment to check that the gas is flowing from the centre of the cutting nozzle.
WARNING! Always use welding gloves and suitable eye protection when welding or cutting. Contact your local Sealey dealer for a
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full range of protective equipment.
5.4
LIGHTING THE TORCH Ensure that the gas hoses will not be in the way of the torch when ignited. Ensure that the torch is facing away
from you before lighting.
5.4.1 Holding the torch in one hand and the striker in the other open the acetylene valve on the torch handle a 1/4 turn (the valve knob is
colour coded red). Operate the striker close to the tip to light the acetylene.
5.4.2 The cutting tip has six separate holes in it arranged radially and each of these holes will have a small flame coming from it. Develop the
correct flame at each hole by alternately increasing the flow of acetylene and then oxygen until a neutral flame is achieved at each hole
having a white cone about an 1/8" long.
5.5
USING THE OXYGEN CONTROL LEVER Use the pre-heat flame to heat the metal to be cut to a cherry red colour. When the metal
reaches this stage press the oxygen control lever to initiate the cutting process. This feeds additional oxygen through a central hole in
the cutting tip. No flame is produced from this hole but the pure oxygen reacts chemically with the hot metal causing it to oxidise i.e. burn away.
5.6
SHUTTING DOWN AND LEAVING SAFE Turn off the acetylene valve on the torch first and then turn off the oxygen valve a few
moments later. Note: Turning the gases off in the wrong order can cause damage to the torch.
5.6.2 Close both cylinder valves.
5.6.3 Drain gas from oxygen regulator by opening the oxygen valve on the torch handle. Similarly drain gas from the acetylene regulator.
5.6.4 Release the adjusting knobs on the regulators. This is done by turning them anti-clockwise.
6.
MAINTENANCE
6.1
Annual maintenance should be carried out by a person who has sufficient practical experience of oxyacetylene gas equipment and a
detailed theoretical knowledge of the functioning of the equipment, the properties of gases used and potential defects and hazards
which may occur and their importance to the integrity and safety of the equipment.
6.2
Regulator elastomers and seals will wear and deteriorate in service and will also deteriorate out of service. Regulators stored for 1 year
or over without use should receive inspection as per the annual maintenance schedule.
EQUIPMENT
Each time equipment is used
(By the operator)
REGULATORS
Visual examination to determine
and their
suitability for service (e.g. correct correct operation
integral protective
gas, pressure rating, damage,
devices.
condition of threads and sealing
surfaces, oil or grease
contamination.
Leak test all joints at working
pressure.
FLASHBACK
Visual examination to determine
ARRESTORS
suitability for service (e.g. gas,
and their integral
pressure rating, damage,
cut off valves
condition of threads and sealing
surfaces, oil or grease
contamination.
Leak test all joints at working
pressure.
HOSE
Visual safety check to determine
ASSEMBLIES
suitabilty for service (e.g gas,
(including non-
pressure rating, damage),
return valves )
condition of cover (e.g. kinking
and twisting ), threads and
sealing surfaces. Check
anti-whip restraints where fitted.
Leak test all joints at working
pressure.
BLOWPIPES
Visual examination of the nozzle
and inlet seatings for damage.
Leak test all joints at working
pressure.
MAINTENANCE
Annual
Functional tests to ensure
Check unit for flow restriction.
Reverse flow to ensure
correct operation of non-return
valves and pressure sensitive
cut off valves where fitted. If
of the pressure sensitive type
check shut off in the tripped
condition in the direction of
flow.
Reverse hose to ensure the
correct operation of non-return
valve where fitted. Bend hose
in a tight radius to ensure
reinforcement is not visible.
Test valve functions. Blank
exits and leak test for internal
malfunctions.
Replacement/
Replacement/
Refurbishment
Refurbisment
Intervals
Guideline
5 years or manufactuers
Replace with a new,
recommendations.
repaired, or service
NOTE: If regulators are
exchange unit.
repaired or refurbished
this shall be done in
accordance with the
BCGA Code of practice
CP17 by a reputable
repairer.
5 years or manufacturers
Replace with a new,
recommendations.
repaired, or service
exchange unit.
Determined by local
Replace as required.
operating conditions.
Determined by local
Replace with a new,
operating conditions.
repaired, or service
exchange unit.
SGA1.V2 - 3 - 060307
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