The document discusses the properties and specifications of oxy-fuel flame cutting, detailing the gases used (oxygen, acetylene, and LPG), their storage, and safety considerations. It outlines the cutting process, including the chemical reactions involved and the types of flames that can be achieved, along with the necessary equipment and operational parameters for using both acetylene and LPG as fuel gases. Additionally, it highlights the importance of gas purity and proper handling of gas cylinders and accessories.

1. POYYARA CONSULTANTS
OXY FUEL FLAME CUTTING

2. POYYARA CONSULTANTS
OXY FUEL FLAME CUTTING
•Cutting Gas
• Oxygen
•Fuel Gas
• Acetylene
• LPG – Liquid Petroleum Gas

3. POYYARA CONSULTANTS
OXY FUEL FLAME CUTTING
•Oxygen Gas
•Extracted From
- Atmosphere, Fractionalization Of Air
- Water, Electrolysis
•Stored In Cylinders
- At High Pressure – 1800 psi
- Cylinder Colour – Black
- Quantity in Volume 7.3 M3

4. POYYARA CONSULTANTS
OXY FUEL FLAME CUTTING
•Acetylene – Fuel Gas
• Produced by the reaction of
- Calcium Carbide with Water
- Cac2 + 2H2O = C2H2 + Ca(OH)2
• Molecular Weight – 26, Lighter Than Air

5. POYYARA CONSULTANTS
OXY FUEL FLAME CUTTING
•Acetylene – Fuel Gas
• Unsafe to Store Free Acetylene above
0.2 Kgs/cm2
– Decompose With
Explosion
• Acetylene Dissolves in Acetone @ 25:1
(V/V) at 1 Atmospheric Pressure
• Solubility increases in multiples of 25
for every increase in Pressure by 1
atmospheric

6. POYYARA CONSULTANTS
OXY FUEL FLAME CUTTING
•Acetylene – Fuel Gas
• Stored In cylinders with Porous Mass
- dissolved in Acetone
- Maximum Pressure of DA – 20 Kgs/cm2
- Quantity of DA Gas in Full cylinder
By volume 6 – 7 M3
- Cost of Gas Appx. Rs:100/- per M3
- Purity of Gas Not Less Than 96%

7. POYYARA CONSULTANTS
OXY FUEL FLAME CUTTING
•Acetylene – Fuel Gas
• Cylinder Colour- Maroon
• Flat Bottom Cylinders – To be Kept Vertical
While in Use
• Internal Bore of Cylinder neck - Left Hand
Threaded

8. POYYARA CONSULTANTS
OXY FUEL FLAME CUTTING
• LPG – Fuel Gas
• Produced in refineries
• Stored In cylinders
- Liquid + vapor stage
- At Low Pressure
- Cylinder Colour- Red
- Flat Bottom Cylinder
- Quantity in Weight – 17 kg

9. POYYARA CONSULTANTS
OXY FUEL FLAME CUTTING
Type Of Oxy - Fuel Gas Flames
Carburizing Flame
Neutral Flame
Oxidizing Flame

10. POYYARA CONSULTANTS
OXY FUEL FLAME CUTTING
Cutting Process
• Feasible Only On Plain Carbon Steels & Low Alloy Steels
• Process is by Conversion of iron to iron oxide
• Steel Locally Heated to Kindling Temperature (800˚C) by Oxy
Fuel Preheating Flame.
• A jet of oxygen is then impinged on this preheated hot iron.
• Iron instantaneously converted in to black iron oxide.
• Exothermic Reaction
• 2Fe + O2 = FeO + Heat (270 kJ),
• 3Fe + 2O2 = Fe3O4 + Heat (1100kJ)

11. POYYARA CONSULTANTS
OXY FUEL FLAME CUTTING
Cutting Process
• Kinetic energy of Oxygen jet drives all non metallic iron
oxide .
• Heat Generated in exothermic reaction is self
sustaining for preheating the metal ahead to cut
• When flame with a jet of oxygen at the centre moves
close to the material, the process is continues by
separating the material along the path of oxygen jet
• Purity of oxygen required for cutting - 99.5%

12. POYYARA CONSULTANTS
OXY FUEL FLAME CUTTING
Cutting Process
Typical Flame Cutting Nozzle

13. POYYARA CONSULTANTS
OXY FUEL FLAME CUTTING

14. POYYARA CONSULTANTS
OXY FUEL FLAME CUTTING
• Cutting Blow Pipe / Torch

15. POYYARA CONSULTANTS
OXY FUEL FLAME CUTTING
ESAB make Cutogen Nozzles for Acetylene
Material Thickness
Size of Nozzle
Cutting Oxygen Pressure
mm inch Kg/cm2
lb./in2
6 1/4 1/32-A-8 1.4 20
12 1/2 3/64-A-12 2.0 30
25 1 1/16-A-16 2.5 35
50 2 1/16-A-16 3.2 45
75 3 1/16-A-16 3.5 50
100 4 1/16-A-16 4.2 60
150 6 5/64-A-20 4.5 65
200 8 3/32-A-24 4.9 70
250 10 7/64-A-28 5.3 75
300 12 1/8-A-32 5.3 75
Acetylene pr. should be set in all cases at 0.14 kg/cm2
, 2 lb./in2
.

16. POYYARA CONSULTANTS
OXY FUEL FLAME CUTTING
ESAB make LPG / NG nozzle
Thickness
Nozzle Size
Operating Pressure
Oxygen L.P.G/ N.G.
mm Kg/cm2
Kg/cm2
6 P-8 2.1 0.2
13 P-12 2.1 0.2
25 P-16 2.8 0.2
50 P-16 3.2 0.3
75 P-16 3.5 0.3
100 P-20 3.5 0.3

17. POYYARA CONSULTANTS
OXY FUEL FLAME CUTTING
• Cutting Process Using
• LPG as Fuel Gas
- Comparatively Poor Cutting Edge /
Surface.
- Maximum Cutting Thickness – 100 mm
- Cutting Nozzle –Two Piece
Construction
- Cutting Parameters (Pressure - O2 &
LPG & Cutting Speed) different from
Oxy acetylene

18. POYYARA CONSULTANTS
OXY FUEL FLAME CUTTING
• Cutting Process Using
• Acetylene as Fuel Gas
- Comparatively Good / Smooth Cutting
Edge / Surface.
- Maximum Cutting Thickness – 300 mm
- Cutting Nozzle –Single Piece
Construction
- Cutting Parameters (Pressure - O2 & C2H2
& Cutting Speed) different from Oxy +
LPG

19. POYYARA CONSULTANTS
OXY FUEL FLAME CUTTING
• Accessories
- Gas Cylinders( O2 & Fuel Gas) with
Pressure Regulators.
- Pair of Hose Pipe Connections
- Cutting Torch
- Cutting Nozzle

20. POYYARA CONSULTANTS
OXY FUEL FLAME CUTTING
• Accessories – O2 Cylinder
- Oxygen Cylinder Neck – Right Hand
Threaded
- All connections to O2 Gas Regulator,
Hose Nipples , Torch Nipples- Right
Hand Threaded

21. POYYARA CONSULTANTS
OXY FUEL FLAME CUTTING
• Accessories – C2 H2
- Acetylene Cylinder Neck – Left Hand
Threaded With A Notch on Hexagonal
Nut
- All connections to Acetylene Gas
Regulator, Hose Nipples , Torch Nipples-
Left Hand Threaded

22. POYYARA CONSULTANTS
OXY FUEL FLAME CUTTING
• Difference in Appearance of Accessories
- Oxygen Cylinder – Black
- Oxygen Cylinders may or may not be flat
bottom
- Oxygen Gas Regulator, Hose, knob on
Torch- Black
- Hexagonal Nipple Connections of O2
Gas Without Any Notch – Plain

23. POYYARA CONSULTANTS
OXY FUEL FLAME CUTTING
• Difference in Appearance of Accessories
- Acetylene Cylinder – Maroon
- Acetylene Cylinder- Flat Bottom
- Acetylene Gas Regulator, Hose , Knob on
Torch – Maroon
- Hexagonal Nipple Connections of
Acetylene Gas - With Notch on Corners

24. Thank You