22 To open and close acetylene cylinder valves not provided with hand-wheels, always use the special wrench or key provided by the supplier. Leave the wrench or key in position, ready for immediate use should it be necessary to close the valve promptly. (When several cylinders are manifolded together, a wrench on every cylinder is not required.) Never use the recessed top of any fuel gas cylinder as a place for tools. It is best to keep acetylene cylinders upright at all times. Do not store them in the horizontal position; do not draw acetylene from a cylinder except when it is upright. If an acetylene cylinder is used in the horizontal position, solvent may be lost and flame quality may be affected. Keep liquid oxygen cylinders vertical. If oxygen is provided in low-pressure liquid oxygen cylinders designed to supply gas for welding or cutting, always keep such cylinders vertical; never lay one of them on its side. The broad base and substantial weight of a liquid cylinder make accidental tipping or knocking over very unlikely. Never use any cylinder, full or empty, as a roller or support. Never, never use oxygen as though it were compressed air. A serious accident may easily result if oxygen is used as a substitute for compressed air. Oxygen must never be used in pneumatic tools, in oil preheating burners, to start internal combustion engines, to blow out pipelines, to ”dust” clothing or work, for pressure tests of any kind, or for ventilation. Oxygen or air rich in oxygen should never be allowed to saturate any part of the clothing since a spark might easily start a serious ”flash” fire. Do not handle oxygen cylinders on the same platform with oil, or place them in any position where oil or grease from overhead cranes or belts may fall on them. Unless they are secured on a suitable cylinder truck, do not move cylinders without first removing regulators and replacing protective cap. Never use slings or electromagnets for lifting cylinders. Do not lift cylinders by the protective cap alone. When moving cylinders, use suitable hand truck or racks whenever possible. Continued on next page... Hard- Surfacing, Building Fusion Welding Carbon Welding Non-Ferrous Metals Heating & Heat Treating Braze Welding Welding Cast Iron Welding Ferrous Metals Brazing & Soldering Equipment Set-Up Operation Equipment For OXY-Acet Structure of Steel Mechanical Properties of Metals Oxygen & Acetylene OXY-Acet Flame Physical Properties of Metals How Steels Are Classified Expansion & Contraction Prep For Welding OXY-Acet Welding & Cutting Safety Practices Manual Cutting Oxygen Cutting By Machine Appendices Testing & Inspecting