Oxygen/ Acetylene Cutting

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Oxygen/ Acetylene Cutting Safety

• By Keith Dover

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Objectives for the Lesson

• Students will be able to identify terms
  associated with oxygen/acetylene cutting.
• Students will be able to label and identify parts
  of a cutting torch.
• Students will be able to list 3 safety
  procedures.

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• Students will be able to identify 3 personal
  protective equipment pieces.
• Students will also demonstrate how to properly
  light torch.
• Students will also demonstrate how to shut down
  torch.

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E-moment

• Take out paper and answer the following
  questions.
• You will have 3 minutes.
• What do you know about oxygen-acetylene cutting
  and safety?
• What do you think you know about oxygen-acetylene
  cutting and safety?
• What dont you know yet about oxygen-acetylene
  cutting and safety?

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Pre-Test

• Take out paper and identify the following pieces
  of equipment
• A. B.

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C. D.E.
F.
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G. H. I. J.
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K. L.
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Defintions

• Oxygen- (non-flammable gas) Is not a fuel it is
  what chemically combines with the fuel to the
  heat for cutting.
• This is called oxidation.
• Its shipped in high pressure cylinders at
  pressures around 2200 lbs/in2

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• Acetylene-(flammable gas) is the primary fuel
  for oxy-acetylene cutting.
• Acetylene is shipped in special cylinders
  designed to keep the gas dissolved.
• The cylinders are packed with porous material,
  then filled to 50 capacity with acetone at 250
  lbs/in2.

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Oxygen/Acetylene CuttingSafety Tips

• Keep an approved fire extinguisher of the proper
  size and type in the work area. 
• Inspect it regularly to ensure that it is in
  proper working order. 
• Know how to use the fire extinguisher.
• Never cut on a container that has had toxic,
  combustible, or flammable liquids in it.

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Safety Tips (contiued)

• Never perform cutting operations in an area
  containing combustible vapors, flammable liquids,
  or explosive dust.
• Keep cutting apparatus clean and free from all
  grease, oil, and other flammable substances.
• Always keep work area well ventilated.

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Oxygen/Acetylene cutting torches can be used to
cut, pierce and gouge mild steel.
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Oxygen/Acetylene Cutting Guidelines
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Oxygen/Acetylene Cutting

• Oxygen/Acetylene cutting operations use fire or
  combustion as a basic tool. 
• The process is very useful when properly
  controlled.
• However, it can be extremely destructive if not
  performed correctly in the proper environment.

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Oxygen/Fuel Cutting

• Gas flames produce infrared radiation
• This may have a harmful effect on the skin and
  especially on the eyes. 

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Oxygen/Acetylene Cutting

• Personal Protective Equipment (PPE)!
• Select goggles or a mask with tempered lenses
• Shaded 5 or darker to protect your eyes from
  injury and provide good visibility of the work.

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• Wear flame resistant clothing, protective
  gloves, sleeves, aprons and safety shoes to
  protect skin and clothing from sparks and slag.
• Keep collars, sleeves and pockets buttoned. 
• DO NOT roll up sleeves or cuff pants.

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Oxygen/Acetylene Cutting

• Good housekeeping practices improve the safety of
  any work area. 
• They are essential to the safety of welding and
  cutting operations due to the potential hazards
  involved.

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Oxygen/Acetylene Cutting

• Warning!
• Never allow oxygen to contact grease, oil, or
  other flammable substances. 

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• Although oxygen by itself will not burn, these
  substances become highly explosive. 
• They can ignite and burn violently in the
  presence of oxygen.

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Oxygen/Acetylene Cutting

• Ventilate welding and cutting work areas
  adequately. 
• Maintain sufficient air flow
• This will prevent accumulation of explosive or
  toxic concentrations of gases. 

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• Welding or cutting operations using certain
  combinations of metals, coatings, and gases
  generate toxic fumes. 
• Use respiratory protection equipment in these
  circumstances.

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Cutting Torch Parts
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Portable Oxygen/ Acetylene Cutting Rig
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(No Transcript)
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Pressure Settings for Oxygen Acetylene
Regulators

• Oxygen 20 psi
• Acetylene 7 psi

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Acetylene Regulator
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Oxygen Regulator
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Oxygen/Acetylene Hose
Green Oxygen Red Acetylene
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Cutting Torch
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Parts of a Cutting Torch
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Spark Lighter
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Cutting Tip
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Welding Tip
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Heating Tip
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Flashback Arrestors
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Reverse Flow Check Valves
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Cutting Torch Manufacturers
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Oxygen/Acetylene Cutting Torch Safety Hazards
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Working Pressure Gauge Failure
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Cracked Acetylene Hose
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Oxygen and Acetylene Cylinders Stored Improperly
Under Stairwell
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Oxygen/ Acetylene Cutting Torch Stored on Unsafe
Cart
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Oxygen/ Acetylene Cutting Torch Stored in
Flammable Liquids Cabinet
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In Conclusion

1. This process can KILL you and others. Follow all
   safety rules.
2. Completely shut down the cutting torch when the
   job is completed.

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• Keep all oils and grease away from the
  regulators.
• When oxygen is compressed with a petrochemical,
  it becomes highly reactive and can explode.
• Imagine a 500lb bomb exploding in front of you.
• Will there be any pieces to pick up?

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Post-Test

• Raise your hand if you think you know what these
  represent
• B.
• Portable
• cutting rig Gauges

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C. Acetylene D. Oxygen
regulator regulator
E.
F. HosesGreen OxygenRed
Acetylene Spark Lighter
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Cutting Torch H. Cutting Tip I.
Welding TipJ.
Heating Tip
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Flashback L. Reverse Flow Arrestors
Check Valves
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Remember Safety is Job 1