Page 226 - CITS - Fitter Trade Pactical - Volume - 2

FITTER - CITS

Table 1
Data for cutting

Diameter of cutting Thickness Cutting
oxygen orifice of steel oxygen
nozzle plate pressure

(1) (2) (3)
mm mm kgf/cm2
0.8 3.6 1.0 - 1.4
1.2 6.19 1.4 - 2.1

1.6 19 - 100 2.1 - 4.2
2.0 100 - 150 4.2 - 4.6
2.4 150 - 200 4.6 - 4.9
2.8 200 - 250 4.9 - 5.5

3.2 250 - 300 5.5 - 5.6

Acetylene pressure should be 0.15 kgf/cm2 for all thickness of plates.
Select ø1.2 mm (orifice) cutting nozzle for cutting a 10 mm thick plate.
Set 1.6 kgf/sq.cm pressure for the cutting oxygen and
0.15 kgf/sq.cm pressure for the acetylene gas.
Ensure safety apparel is worn.

Fix the cutting nozzle into the cutting blowpipe correctly. (Fig 3)

Fig 3

Check for leakage in the blowpipe connections of oxygen and actylene gas lines.
Adjust the neutral flame for preheating. (Fig 4)
Ensure that the flame adjustment is not disturbed while operating the cutting oxygen lever.

211

CITS : C G & M - Fitter - Exercise 54