What should the pressures be on a cutting torch?
The gas pressures should be set at 3 to 5psi for Acetylene, and 20 to 30psi for the oxygen, but when you squeeze the oxygen lever after the initial flame adjustment of the preheat flames to neutral just to a point where the feather disappears,the oxygen cutting stream should be visible and at least 4 inches in length …
What is the purpose of torch cutting?
Definition: Process for cutting metal using an apparatus that produces a very hot flame through the combustion of gases.
What are the common faults in Oxy flame cutting?
Dirty Nozzle The cut surface will not be smooth and square, and there may be pitting, under- cutting, heavy slag or scale. The nozzle should be cleaned with care, so as not to distort, or bell-mouth, the cutting oxygen bore.
What is the normal working pressure for acetylene?
The working pressure of acetylene equipment is critical: Acetylene pressure must not exceed 0.62 bar (9psi) unless equipment has been specifically designed for it.
What should my oxygen and acetylene be set at for cutting?
Recommended oxy/acetylene cutting tip pressures vary with size. If you have no manufacturer setting- information, and are cutting less than 1 ½” thick steel, set the acetylene regulator for 10 psig, and the oxygen regulator for 40 psig.
Do you turn off the oxygen or acetylene first?
oxygen valve
We recommend closing the oxygen valve first whenever turning off an oxy-fuel torch system especially when Acetylene is fuel.
What is the ratio of oxygen to acetylene?
1.2:1
Natural Gas
| Fuel Gas | Maximum Flame Temperature °C | Oxygen to fuel gas Ratio (vol) |
|---|---|---|
| Acetylene | 3,160 | 1.2:1 |
| Propane | 2,828 | 4.3:1 |
| MAPP | 2,976 | 3.3:1 |
| Propylene | 2,896 | 3.7:1 |
What is the maximum working pressure of acetylene?
What is slag in gas cutting?
After pre-heating the surface, oxygen will stream through the nozzle to change the solid pre-heated steel into liquid oxidised steel (slag). Spatter occurs during this process, because the oxygen blows away the slag upwards during piercing.
What is the ratio of oxygen in gas cutting?
Propane has a greater stoichiometric oxygen requirement than acetylene; for the maximum flame temperature in oxygen, the ratio of the volume of oxygen to fuel gas are 1.2 to 1 for acetylene and 4.3 to 1 for propane.
What should oxygen be set at on torch?
Safe numbers are 40 psi for oxygen and 10 psi for acetylene, regardless of tip size. Simply adjust them until you get a neutral flame.
What pressure do you operate oxygen at on a torch?
Close both torch valves. For the oxygen, turn the pressure-adjusting screw on the regulator until the gauge reads about 25 psi.
How do you test acetylene?
Test for acetylene leaks first.
- Use the Safetest Leak Detection Spray.
- Spray directly onto the joints and connections.
- Check that torch valves are closed and that regulators are set to zero outlet pressure.
- Open acetylene cylinder valve very slowly (sudden opening may cause damage to the regulator)
What is draw limit for acetylene?
Acetylene is limited to a maximum continuous withdrawal rate of 1/7 of the cylinder’s rated capacity when full. Example: An acetylene cylinder that has a capacity of 330 cubic feet has maximum withdrawal rate of 47 cubic feet.
When should you not use a cutting torch?
your working area, never use a cutting torch where sparks will be a hazard, such as near a room containing flammable or combustible materials, keep flammable containers in a cabinet away from the working area. 56.4100;
How to manage a torch safety project?
Cutting Torch Safety SLAM Stop Look Analyze Manage every project should begin with a plan that includes discussion on how this type of task had been completed before and any problems that may occur. Lock-out, tag-out, test, and never
What do you use to light a torch?
Use a striker to light the torch, as matches and lighters are dangerous. Strikers are specifically designed for lighting torches which reduces the chance of injury. Safety comes first.
How does an oxy-acetylene torch work?
An oxy-acetylene torch, as the name suggests, allows for a mixture of oxygen and acetylene to combust and create a flame that can exceed 3000 °C (over 5000 °F). This high temperature makes the flame hot enough to cut through mild steel.