Transcript Oxygen/ Fuel Cutting and Welding

Oxygen/ Acetylene
Cutting & Safety
By Keith Dover
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 5 safety
procedures.
• Students will be able to identify 5 personal
protective equipment pieces.
E-moment
Take out a piece of paper and answer the following
questions. You will have 3 minutes.
• What do you know about oxygenacetylene cutting and safety?
• What do you think you know about
oxygen-acetylene cutting and safety?
• What don’t you know yet about oxygenacetylene cutting and safety?
Pre-Test
•
Turn to a partner and identify the
following:
A.
B.
C.
E.
D.
F.
G.
H.
J.
I.
K.
L.
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”.
It’s shipped in high pressure cylinders at
pressures around 3000 lbf/in2
• 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 diatomaceous, then filled to
50% capacity with acetone.
Oxygen/Acetylene Cutting
Safety 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.
 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.
Oxygen/
Acetylene
cutting torches
can be used to
cut, pierce and
gouge mild
steel.
Oxygen/Acetylene
Cutting
Guidelines
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.
Oxygen/Fuel Cutting
Gas flames produce infrared radiation
which may have a harmful effect on
the skin and especially on the eyes.
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.
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.
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.
Oxygen/Acetylene Cutting
Warning!
Never allow oxygen to contact
grease, oil, or other flammable
substances. Although oxygen by
itself will not burn, these substances
become highly explosive.
They can ignite and burn violently in
the presence of oxygen.
Oxygen/Acetylene Cutting
Ventilate welding and cutting work areas
adequately.
Maintain sufficient air flow to prevent
accumulation of explosive or toxic
concentrations of gases.
Welding or cutting operations using
certain combinations of metals, coatings,
and gases generate toxic fumes. Use
respiratory protection equipment in these
circumstances.
Cutting Torch
Parts
Portable
Oxygen/
Acetylene
Cutting Rig
Pressure Settings for Oxygen
and Acetylene Regulators
• Oxygen = 40 psi
• Acetylene = 5-8 psi
Acetylene Regulator
Oxygen Regulator
Green = Oxygen
Red = Acetylene
Oxygen/Acetylene Hose
Cutting Torch
Parts of a Cutting Torch
Spark Lighter
Cutting Tip
Welding Tip
Heating Tip
Flashback
Arrestors
Reverse Flow Check Valves
Cutting Torch Manufacturers
Oxygen/Acetylene
Cutting Torch Safety
Hazards
Working Pressure Gauge
Failure
Cracked Acetylene Hose
Oxygen and Acetylene
Cylinders Stored
Improperly Under Stairwell
Oxygen/
Acetylene
Cutting
Torch Stored
on Unsafe
Cart
Oxygen/ Acetylene Cutting
Torch Stored in Flammable
Liquids Cabinet
In Conclusion
1. This process can KILL you and others.
Be sure to follow all safety rules.
2. Be sure to completely shut down the
cutting torch when the job is completed.
3. 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?
Post-Test
•
Raise your hand if you think you know
what these represent:
A.
B.
Portable
cutting rig
Gauges
C.
Acetylene
D.
regulator
E.
Oxygen
regulator
F.
Hoses
Green= Oxygen
Red= Acetylene
Spark
Lighter
G.
Cutting Torch
H. Cutting Tip
I. Welding Tip
J.
Heating
Tip
K.
Flashback
Arrestors
L. Reverse Flow
Check Valves
Remember…
Safety is Job
#1