Presentation on theme: "Oxy Fuel Cutting Systems Basic Setup & Use"— Presentation transcript:
1Oxy Fuel Cutting Systems Basic Setup & Use Tim Turner
2Typical Torch System Oxygen Cylinder Acetylene Cylinder Method of Securing the cylindersCapsRegulatorsBackflash arrestorsHosesTorch BodyTorch HeadTorch TipClothing and Eye/Face Protection
3Oxygen Cylinders Oxygen is very pure - 99% Pressure is about 2200 psi at 700 FHydrostatic tested to 3300 psiForged from a single piece of steel - no weldingMinimum of 1/4” thicknessAnnealed periodicallyStored away from combustibles5’ high wall1/2 hour fire rating
6Acetylene Cylinders Acetone - absorbs acetylene under pressure Consumption rate = 1/7 content per hourFusible plug FTemperature has an extreme affect on pressureLet stand upright at least 20 minutes before usingProtected valve or cylinder capStored away from oxygen and combustibles5’ high wall1/2 hour fire rating
8Acetylene Cylinders C2H2 - Made from calcium carbide and water Welded constructionMonolithic filler - Asbestos fibers, balsawood (85% porus)Acetone - absorbs acetylene under pressureFusible plug FConsumption rate = 1/7 content per hourTemperature has an extreme affect on pressureLet stand 20 minutes before usingProtected valve or cylinder capSold by cubic feet - determined by weight of the cylinders
9Oxygen Cylinder Valve Brass Construction Double back seat - NEVER LEAVE HALF OPENPop off valve - (fragile disk)Right hand Thread
10Acetylene Cylinder Valve Brass ConstructionPacked valve - OPEN 1/2 TO 3/4 TURNHand wheel or tank wrench - NEVER REMOVE WRENCH during useRH (Male) or LH (Female) Thread
12Parts: Cylinders Hoses - Brass or braided Check valves or hand valves Flashback Arrestors - OSHARegulatorsMain valves
13Procedure for changing tanks: Continuous supply of gassesDo not allow empties to be pressurizedValves and/or checkvalvesNever unsecure cylinders without protective capsCheck for LeaksMT - DATE
14Regulators Gauges - High and Low pressure Bonnet - weakest point Adjusting screw - Clockwise = On
15Regulators Single stage - less expensive Dual stage - more accurate - lump on back psiNozzle Type - low volumeStem type - High VolumeGauges - High and Low pressure - bourbon tubeBonnet - weakest pointAdjusting screw - Clockwise = On
16Protector Cap Protects valve from being knocked off Must be in place when Regulators are off
24Acetylene safety Precautions Never call acetylene “gas”Extremely explosive with air or oxygenLeave wrench on tank
25Oxygen Safety Precautions Never call oxygen “Air”Never allow oxygen to come in contact with oil, grease, or other petroleum basesNever use oxygen for compressed airNever move cylinders without capsAlways secure cylinders
26Setup Procedures for Oxy-Acetylene Systems Do not move cylinders without valve protectionSecure cylindersInspect threads“Crack” Oxygen ValveAttach regulators and tightenBlow talc from new hosesAttach Flashback arrestors, check valves, hoses, check valves, torch body, torch head, and tipProperly pressurize torch and check for leaks
27Procedures for Lighting Oxy-Acetylene Systems SCREW ADJUSTING SCREW OUTStand to the side of the adjusting screwOpen tanks one at a time (Oxygen wide, Acetylene 1/2 turn)Adjust regulatorsBleed lines one at a timeFine adjustments made while bleeding the hosesOpen the acetylene needle valve and light torchOpen high pressure oxygen needle valve wideAdjust to a neutral flame
28Shut Down Procedure for Oxy-Acetylene Systems Turn off acetylene needle valveTurn off preheat oxygen needle valveTurn off tanksBleed lines one at a timeTURN ADJUSTING SCREWS OUTTurn off all needle valves
30Starting or restarting a cut Heat the starting pointResume CuttingMove the oxygen hole off the edge of the plate and start the oxygen stream
31Offhand Cutting Techniques Rolling your hands“Pre-load” your wrist and forearmRoll, don’t slide for a smoother cutSliding the torch through your fingersApply pressure to torch tubes with thumb and index fingerKeep other three fingers in fistDon’t move the torch body hand during stops and starts.
32Beveling 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.
33Safety Backflash Watch where you cut Turn Oxygen off first Don’t blow molten metal toward another personDon’t melt the hosesDon’t drop metal on hosesDon’t let hoses lay on hot metal
34Headgear Assembly Forehead pad Proper adjustment How to assemble How lenses go inCleaning different types of lensesAutochange hoodsShade numbers for various thingsCracked or broken hoodsHood designs (pipeliner, short, sock, brazing shield, handheld).