Oxy%20Fuel%20Cutting%20Systems%20Basic%20Setup%20

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Oxy Fuel Cutting SystemsBasic Setup Use

• Tim Turner

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Typical Torch System

• Oxygen Cylinder
• Acetylene Cylinder
• Method of Securing the cylinders
• Caps
• Regulators
• Backflash arrestors
• Hoses
• Torch Body
• Torch Head
• Torch Tip
• Clothing and Eye/Face Protection

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Oxygen Cylinders

• Oxygen is very pure - 99
• Pressure is about 2200 psi at 700 F
• Hydrostatic tested to 3300 psi
• Forged from a single piece of steel - no welding
• Minimum of 1/4 thickness
• Annealed periodically
• Stored away from combustibles
• 5 high wall
• 1/2 hour fire rating

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Oxygen cylinder sizes
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Liquid Oxygen is stored in a dewer flask
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Acetylene Cylinders

• Acetone - absorbs acetylene under pressure
• Consumption rate 1/7 content per hour
• Fusible plug - 2120 F
• Temperature has an extreme affect on pressure
• Let stand upright at least 20 minutes before
  using
• Protected valve or cylinder cap
• Stored away from oxygen and combustibles
• 5 high wall
• 1/2 hour fire rating

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Acetylene Cylinders

• C2H2 - Made from calcium carbide and water
• Welded construction
• Monolithic filler - Asbestos fibers, balsawood
  (85 porus)
• Acetone - absorbs acetylene under pressure
• Fusible plug - 2120 F
• Consumption rate 1/7 content per hour
• Temperature has an extreme affect on pressure
• Let stand 20 minutes before using
• Protected valve or cylinder cap
• Sold by cubic feet - determined by weight of the
  cylinders

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Oxygen Cylinder Valve

• Brass Construction
• Double back seat - NEVER LEAVE HALF OPEN
• Pop off valve - (fragile disk)
• Right hand Thread

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Acetylene Cylinder Valve

• Brass Construction
• Packed valve - OPEN 1/2 TO 3/4 TURN
• Hand wheel or tank wrench - NEVER REMOVE WRENCH
  during use
• RH (Male) or LH (Female) Thread

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Manifold Systems

• Increased Efficiency
• more stations
• no downtime

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Parts

• Cylinders
• Hoses - Brass or braided
• Check valves or hand valves
• Flashback Arrestors - OSHA
• Regulators
• Main valves

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Procedure for changing tanks

• Continuous supply of gasses
• Do not allow empties to be pressurized
• Valves and/or checkvalves
• Never unsecure cylinders without protective caps
• Check for Leaks
• MT - DATE

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Regulators

• Gauges - High and Low pressure
• Bonnet - weakest point
• Adjusting screw - Clockwise On

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Regulators

• Single stage - less expensive
• Dual stage - more accurate - lump on back - 200
  psi
• Nozzle Type - low volume
• Stem type - High Volume
• Gauges - High and Low pressure - bourbon tube
• Bonnet - weakest point
• Adjusting screw - Clockwise On

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Protector Cap

• Protects valve from being knocked off
• Must be in place when Regulators are off

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Backflash Arrestor

• Torch / Manifold
• Regulator / torch

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Hoses

• Acetylene Red
• Notch around nut means LH thread
• Oxygen Green
• RH Thread
• New Hoses have talc inside - Blow out before
  connecting to torch

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Needle valves

• What each does
• Preheat / Cutting hole pressures
• Tightening

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Torch Body

• single stage / dual stage

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Cutting Head

• Preheat oxygen needle valve
• Seat type / Graphite type - tightening
• Body to head connection - tightening
• Oxygen lever - regulator setting, 1 needle valve
  setting

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Cutting Tips

• 1 or 2 piece
• sizes relate to Drill Sizes
• Hand / Wrench tight

Rosebud
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Tip Cleaners
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Acetylene safety Precautions

• Never call acetylene gas
• Extremely explosive with air or oxygen
• Leave wrench on tank

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Oxygen Safety Precautions

• Never call oxygen Air
• Never allow oxygen to come in contact with oil,
  grease, or other petroleum bases
• Never use oxygen for compressed air
• Never move cylinders without caps
• Always secure cylinders

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Setup Procedures for Oxy-Acetylene Systems

• Do not move cylinders without valve protection
• Secure cylinders
• Inspect threads
• Crack Oxygen Valve
• Attach regulators and tighten
• Blow talc from new hoses
• Attach Flashback arrestors, check valves, hoses,
  check valves, torch body, torch head, and tip
• Properly pressurize torch and check for leaks

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Procedures for Lighting Oxy-Acetylene Systems

• SCREW ADJUSTING SCREW OUT
• Stand to the side of the adjusting screw
• Open tanks one at a time (Oxygen wide, Acetylene
  1/2 turn)
• Adjust regulators
• Bleed lines one at a time
• Fine adjustments made while bleeding the hoses
• Open the acetylene needle valve and light torch
• Open high pressure oxygen needle valve wide
• Adjust to a neutral flame

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Shut Down Procedure for Oxy-Acetylene Systems

• Turn off acetylene needle valve
• Turn off preheat oxygen needle valve
• Turn off tanks
• Bleed lines one at a time
• TURN ADJUSTING SCREWS OUT
• Turn off all needle valves

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Flame types
Oxidizing
Carborizing
Neutral
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Starting or restarting a cut
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Offhand Cutting Techniques

• Rolling your hands
• Pre-load your wrist and forearm
• Roll, dont slide for a smoother cut
• Sliding the torch through your fingers
• Apply pressure to torch tubes with thumb and
  index finger
• Keep other three fingers in fist
• Dont move the torch body hand during stops and
  starts.

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Beveling Angles

• Slide the torch through your fingers toward you.
• Only move the hand nearest the flame when
  continuing the cut.
• Keep your other three fingers in your fist. This
  will keep your hands cooler and allow you to make
  a better cut.

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Safety

• Backflash
• Turn Oxygen off first
• Watch where you cut
• Dont blow molten metal toward another person
• Dont melt the hoses
• Dont drop metal on hoses
• Dont let hoses lay on hot metal

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Headgear Assembly

• Forehead pad
• Proper adjustment
• How to assemble
• How lenses go in
• Cleaning different types of lenses
• Autochange hoods
• Shade numbers for various things
• Cracked or broken hoods
• Hood designs (pipeliner, short, sock, brazing
  shield, handheld).