Page 197 - CITS - Fitter Trade Pactical - Volume - 2

FITTER - CITS

Fix the hose-protectors at the blowpipe ends. The hose- protectors with a groove at the corners are fixed on the
acetylene hose-pipe and connected to the acetylene inlet of the blowpipe. The hose-protectors without cutting
marks are fixed on the oxygen hose-pipe and connected to the oxygen inlet of the blowpipe. (Fig 14)

Fig 14

The hose-protectors protect against the return flow of gas from the blowpipe to the rubber hoses. They act as
non-return valves.
Adjusting the gas pressure
The gas pressure for both oxygen and acetylene has to be adjusted at regulators according to the size of the
nozzle.
The size of the nozzle is selected according to the job material and thickness.
For adjusting the gas pressure, open the valves of both the cylinders slowly by one turn and set the pressure
on both regulators as 0.15 kg /cm2 for small size nozzles, by tightening the pressure adjusting screws. (Fig 15)
Ensure the blow pipe control valves are kept open while setting the gas pressure.

Fig 15

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CITS : C G & M - Fitter - Exercise 53