The scope of this document is for metal oxygen pipelines distribution piping systems and gaseous oxygen piping on an air separation plant external to the coldbox It is limited to gaseous oxygen with a temperature range between –30 °C and °C –22 °F and °F pressures up to 21 MPa

Oxy fuel cutting torches use a copper tip with a series of holes arranged in a circle to deliver a mixture of a fuel gas and oxygen to create a pre heat flame Preheat flame temperatures will range from 4 ° to 6 ° F depending upon the fuel gas used and the adjusted ratio of oxygen to fuel gas

A flammable gas used in oxy fuel welding and cutting Burns at degrees F and is cheaper than acetylene Oxygen Pure gas that is mixed with the fuel gas to create a neutral flame Is also used to start the oxidation reaction in oxy fuel cutting Acetylene Cylinder Gas tank containing acetylene gas

The storage requirements cannot be met if an oxygen cylinder and an acetylene cylinder are on a welding cart they would lack the required separation and there is not normally a fire barrier available for a cart that would meet the requirements of the standard

12 0 Gas Cutting 40 13 0 Oxy fuel Cutting Procedures 42 13 1 Cutting Attachment Operation 42 13 2 Setting Up 43 13 3 Lighting Up 44 13 4 Closing Down 45 14 0 Oxy acetylene Cutting Techniques 46 14 1 How it Works 46 15 0 Using the Cutting Assembly 48 16 0 Mild Steel Cutting 49 16 1 Thin Steel 49 16 2 Thick Steel 49

If your oxygen cylinder is low or empty reverse flow of gas may occur The fuel gas being at a higher pressure can travel up the oxygen line and mix with gas in the hose regulator and cylinder If you light your torch without purging the lines a burn back may occur with explosions in the hose regulator or cylinder

1 Gas Cutting Torch A specially designed gas cutting torch is shown in Fig The tip of the cutting torch has a larger centre opening from which a jet of oxygen comes to cut the metal This central opening surrounded by a set of orifices generally four which supply the oxygen acetylene mixture for pre heating

A pressure gauge Fig 1 2 indicates that gas is available Oxygen cylinders contain oxygen under pressure and the pressure gauge gradually falls as the cylinder is depleted A full size E cylinder the size fitted to most anaesthetic machines contains approximately l of gas Manufacturers label the cylinders to confirm this

Hose and hose fittings are used to carry the gases from cylinder to cutting torch 5 Goggles and Glasses Goggles fitted with coloured lenses are used to protect the operator eyes from ultraviolet and harmful infra red radiations

Both oxygen and fuel gases are filled in the cylinder at high pressure These gases cannot use at this high pressure for welding works so a pressure regulator is used between the flow It supplies oxygen at a pressure of about 70 – Kn m2 and gas at 7 – Kn m2 to the welding torch

May 04 Burnback If your oxygen cylinder is low or empty reverse flow of gas may occur The fuel gas being at a higher pressure can travel up the oxygen line and mix with gas in the hose regulator and cylinder If you light your torch without purging the lines a burnback may occur with explosions in the hose regulator or cylinder

Mar 19 Fuel Gas Options Oxygen Fuel Gas kits used to be simple you had Oxygen Acetylene However the waters are now muddied by a number of factors Acetylene can be hard and expensive to obtain Cylinder Rental for Acetylene Cylinders has shot up in price

Dec 25 When this happens the reverse flow mixes oxygen and the fuel gas acetylene in the same line The flashback occurs when oxygen and fuel gas mix in a supply line and are ignited by relighting a torch after the torch tip has clogged without first cleaning the lines or by cylinders without first closing the regulators and cleaning the lines

Dec 31 Section a 10 requires that oxygen cylinders that are in storage be separated from fuel gas cylinders and combustible materials It specifies that the cylinders either be separated by a minimum of 20 feet or have a non combustible fire wall with a fire resistance rating of one half hour at least five feet high

Where a liquid oxygen system is to be used to supply gaseous oxygen for welding or cutting and the system has a storage capacity of more than 13 cubic feet m 3 of oxygen measured at 14 7 psia kPa and 70 °F 21 1 °C connected in service or ready for service or more than 25 cubic feet m 3 of oxygen measured at 14

Smooth Cutting Oxygen Valve for precise ease on control push type Brass Coupling Nut amp Double O Ring Seal gives quick gas tight seal without a tightening wrench Stainless Steel Lever for extra durability Spiral Mixer blends oxygen and all fuel gases for optimum performance Die Forged Brass Head for maximum durability Forged Brass Body

of pressure bar psi Lit Min Ft3 h Gas Bar Part No Acetylene General welding cutting amp heating applications 1 3 A 1 5 Oxygen General cutting amp welding 4 60 O 4 Oxygen Cutting amp heating 10 O 10 Inert Purging amp pressurising leak detection 10 N 10

Apr 17 CYLINDER COST Approx 25 for 9kgs Equals or 1 5 G size cylinders totalling DEPOT FEE 0 11 for each exchange OXYGEN Consumes same quantity of oxygen in cutting jet HEAT PRODUCTION Uses more oxygen in heating but produces more heat in a larger area Uses less oxygen in heating but produces less heat in an equivalent area

Oxygen is an accelerant it causes every thing it comes in contact with to burn hotter and faster Air has a vapor density of Oxygen is heavier than air This means if a oxygen bottle is leaking the gas will settle in low areas before diffusing back into the atmosphere

Strictly observe the safety rules and precautions to ensure the safety of gas cutting operations Operators and supervisors must keep safety in mind 1 2 1 Prevention of explosion 1 Never cut pressurized cylinders or hermetically sealed containers 2 Ensure sufficient ventilation for gas cutting to prevent the air from becoming state

Dec 11 The advantages of gas cutting It is portable can be taken anywhere and used It is able to cut thick material with a range of cutting tips sold separately It requires a low skill level and is easily mastered The Disadvantages of Gas Cutting The oxygen acetylene gas once combined will only cut iron based ferrous steels

Oxygen cylinders contain oxygen under pressure and the pressure gauge gradually falls as the cylinder is depleted A full size E cylinder the size fitted to most anaesthetic machines contains approximately l of gas

How to change your oxygen cylinder Turn off the oxygen flow 1 Using the small cylinder wrench turn the cylinder on off valve clockwise to close it 2 Bleed off the pressure in the valve by opening the flow regulator knob 3 When the gauge reads zero turn the flow regulator knob to zero – Always keep oxygen cylinders in a well

Oxy fuel welding commonly called oxyacetylene welding oxy welding or gas welding in the United States and oxy fuel cutting are processes that use fuel gases or liquid fuels such as gasoline and oxygen to weld or cut metals French engineers Edmond Fouché and Charles Picard became the first to develop oxygen acetylene welding in

Strictly observe the safety rules and precautions to ensure the safety of gas cutting operations Operators and supervisors MUST keep safety in mind 1 2 1 Prevention of explosion er cut pressurized cylinders or hermetically sealed containers ure sufficient ventilation for gas cutting to prevent the air from becoming stale

A set of MAPP and oxygen cylinders used for oxy fuel welding and cutting MAPP gas was a trademarked name belonging to The Linde Group a division of the former global chemical giant Union Carbide for a fuel gas based on a stabilized mixture of methylacetylene propyne propadiene and propane

oxygen cylinder Turn off the oxygen flow 1 Using the small cylinder wrench turn the cylinder on off valve clockwise to close it 2 Bleed off the pressure in the valve by opening the flow regulator knob 3 When the gauge reads zero turn the flow regulator knob to zero – Always keep oxygen cylinders in a well

Feb 02 Plasma cutting aluminum plate or stainless plate with oxygen plasma gas is not recommended Oxygen plasma gas reacts with carbon steel to produce a finer spray of molten metal each droplet having a lower surface tension This molten spray is more easily ejected from the kerf The disadvantage of oxygen is the cost of the gas and the

When starting a cut in steel away from the edge pierce a hole through the metal to start the cut Figure 7 3 To do this heat a spot to cherry red raise the torch ½ inch or more above the normal position for cutting to prevent slag from being blown against and fouling the tip and slowly press the cutting oxygen lever CAUTION