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Oxyacetylene is a combination of the words oxygen and acetylene. It refers to the equipment and processes where 2 gases are used together. (In our set.

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Presentation on theme: "Oxyacetylene is a combination of the words oxygen and acetylene. It refers to the equipment and processes where 2 gases are used together. (In our set."— Presentation transcript:

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2 Oxyacetylene is a combination of the words oxygen and acetylene. It refers to the equipment and processes where 2 gases are used together. (In our set up we use MAPP gas and oxygen.) MAPP = methylacetylene-propadiene A portable oxyacetylene rig includes a cart, cylinders, valves, regulators, gauges, hoses, & torch assemblies. Torch is an assembly that mixes gases and discharges them to support a controllable flame. A gas cylinder is a long round tank with extremely thick walls built to hold gases under pressure. Valve is a device that allows gas to flow from cylinder. Regulator is device that keeps the pressure of flowing gas at a constant rate. Gauge is mounted on a regulator to measure and indicate pressure in the hose, tank, or manifold.

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4 Check valves prevent a flame from reaching gas in the cylinder. Hoses are flexible lines that carry gases. Red = fuel gas Green = oxygen

5  Always green in color  Have right-handed threads  Made of high carbon steel  Extruded (made out of one piece of metal)  Full tank has a pressure of 3360 psi  Oxygen in a cylinder is 97% pure  Double-seated valve made of brass so it’s soft and self-seals  Oxygen speeds up the burning process  Inspected with a hydrostatic (water pressure) inspection every 10 years and stamped on tank when passed  Open all the way and SLOWLY  Threaded ring on top oxygen cylinder holds cap on (never attempt to move without cap on!)  Tank owners’ names are stamped on top of cylinder by the rings  Never use oil or grease on or around oxygen equipment  Never use oxygen to blow dirt off clothing or equipment

6  Always red in color  Full tank is 250 psi  Left-handed threads are identified by groove on hex  Unstabilized (aceytlene in its natural state) is dangerous above 15 psi  Porous material absorbs aceytlene in the cylinder  Acetone stabilizes acetylene  Cylinder valves made of brass because it doesn’t spark  Safety device is fusible plug (temperature above 212 degrees F)  Visual inspection every time it’s filled  Never use laying on its side  Only open ¼ turn

7  Reduce cylinder pressure to adjustable, safe constant line pressure  A metallic filter in the stem of the gauge to prevent damage to the hose.  Turning the regulators t-screw to the right increases the working pressure  Backing out t-screw all the way will stop working pressure  Regulator gauge closest to the cylinder indicates tank pressure  Oxygen regulator provides a 3360 psi bursting disk

8  Work area must be cleared of all flammable materials  First step before using a torch outfit is to crack each cylinder valve one at a time to clear away any dirt or dust before connecting the regulators and lines  Light the torch with a striker  Check valves are used to prevent back flow  Flash arrestors are used to prevent both back flow and back flash  Back fire is a loud pop  Back flash is burning in the handle  Minimum distance between cutting area and torch outfit should be at least 10 feet  When bleed the hoses, bleed them on at a time

9  When shutting down a torch outfit, bleed the hoses before backing out the regulator t-screws  Size of a tip is determined by the hole diameter of it (hole is 1/3 of plate thickness)  The large heating tip is called a rosebud  When using a tip cleaner to clean a torch tip, always allow a small amount of gas to flow  Always cap cylinder before removing it from the cart  Safety device on the hose is a check valve  Welding tip size corresponds to flame size  Tip cleaners are rods with rough edges designed to remove soot, dirt, or metal residue from the hole in the tip

10 1)Close main valves (Acetylene first; Oxygen second) 2)Bleed hoses one at a time 3)Back out t-screws 4)Close handle valves 5)Remove tip and replace the nut 6)Coil hoses

11 AcetyleneOxygen Cutting5-8 psi30-40 psi Welding5-8 psi15-20 psi Heating8-10 psi50 psi Carburizing Flame: coolest flame; 5,000 degrees F; used to weld lead and case hardening; hot inner core with a white-hot acetylene feather and blue outer cone Neutral Flame: 5900 degrees F; light blue inner core and darker blue to colorless outer cone; most commonly used flame Oxidizing Flame: hottest flame; 6300 degrees F; inner cone has purplish tint and more pointed; loudest flame; used for welding copper and zinc base metals

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