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1.
INTENDED USE
Cutting torches R8 are designed for manual heat cutting of low-carbon steels with material
thickness of 3 - 300 mm. The options R8, possibly R8D, have the mixing injector torch de-
signed for usage of acetylene, the options R8PB and R8D-PB are equipped with an injector
using propane - butane and other alternative gases (LPG).
EN
3.
SAFETY INSTRUCTIONS
•
For increasing of work safety, it is recommended to use the hose non-return valves (e.g.
BV12) placed on the handle input and the flashback arrestors (FR250) placed on the
regulator output.
•
Use such nozzles only which correspond with the type of cutting torch and with the type
of fuel gas.
•
Keep the cutting nozzle clean - avoid grease on the surfaces which are in contact with
oxygen.
•
A special procedure must be followed, when an operation failure occurs which causes
flash back. Cracking and following whistling inside the cutting torch is typical for flash
back. In such a case close the oxygen valve on the torch immediately and then close also
the supply of fuel gas. Let the cutting torch cool down, check them, find and remove the
cause of flash back.
•
Observe the fire protection rules and measurements at work - keep safe distance from
inflammable materials.
•
When working in close rooms, ventilate the working area.
•
Use personal protection aids.
2.
OPERATION
3.1.CONNECTING THE TORCH
•
For gas inlet into the torch, the oxygen hose 6/14 and the inflammable gas hose 8/16 are
connected through special hose nozzles. The thread of oxygen connection to the torch is
G 1/4", the spanner for nut running is OK17, the thread of inflammable gas screw is G 3/8"
LH, the nut can be tightened by the spanner OK19.
•
Before connecting the inflammable hose, it is necessary to check the suction effect of
injector. When a preheating and a cutting nozzle are connected to the torch and the valves
of preheating oxygen and fuel gas are fully opened, suction of air into the torch must be
evident on the opened screw or on the hose connection.
•
The cutting nozzles can be tightened by the spanner OK10, the preheating nozzles can
be tightened by the spanner OK22. When tightening or releasing a nozzle, hold the torch
head by spanner or clamp it in the vice to avoid deformation of inlet pipes.
•
When cutting with use of a cutting-torch guide roller, connect the guide roller to the torch
head by the means of a sleeve. When cutting circular openings, connect a circular cutting
attachment and release the sleeve.
3.2.LIGHTNING AND REGULATING OF THE CUTTING TORCH
•
Choose a appropriate cutting and preheating nozzle (see the tables) and screw them.
•
Close the torch valves and set the pressure of gases by means of regulator.
•
When the cutting oxygen valve is open, clean the hoses by quick opening of torch valves.
When blowing the hoses through, check the oxygen pressure and the pressure of fuel gas
and, if necessary, set the right pressure. Then close the valves.
•
Open fully the oxygen valve, then open partially the fuel gas valve and ignite the flame.
•
After opening of the cutting oxygen valve, set a neutral preheating flame by means of the
fuel gas valve.
•
After opening of the cutting oxygen valve, check whether the oxygen pressure corre-
sponds with the thickness of cutting material.
4/16
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