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AC 43.13-1B CHG 1 9/27/01 a. Inspect oxy-fuel apparatus for oil, grease, or damaged parts. DO NOT use the oxy-fuel apparatus if oil or grease is present or if damage is evident. Have the oxy-fuel appa ratus cleaned and/or repaired by a qualified re pair technician before it is used. b. Never use oil or grease on or around any oxy-fuel apparatus. Even a trace of oil or grease can ignite and burn violently in the presence of oxygen. c. Keep flames, heat, and sparks away from cylinders and boxes. d. Flying sparks can travel as much as 35 feet. Move combustibles a safe distance away from areas where oxy-fuel operations are performed. e. Use approved heat-resistant shields to protect nearby walls, floor, and ceiling. f. Have a fire extinguisher of the proper class (ABC) and size in the work area. Inspect it regularly to ensure that it is in proper work ing order. Know how it is used. g. Use oxy-fuel equipment only with the gases for which it is intended. h. DO NOT open an acetylene cylinder valve more than approximately 1-1/2 turns and preferably no more than 3/4 of a turn. Keep the cylinder wrench, if one is required, on the cylinder valve so, if necessary, the cylinder may be turned off quickly. i. On all gases except acetylene, open the cylinder valve completely to seal the cylinder back-seal packing. j. Never test for gas leaks with a flame. Use an approved leak-detector solution. k. When work is complete, inspect the area for possible fires or smoldering materials. l. Special care should be taken when welding structural tubing that has been coated on the inside with linseed oil. Smoke and fire may be generated by the heat of the torch. En sure that an observer with a fire extinguisher is close. 4-115. PROTECTIVE APPAREL. a. Protect yourself from sparks, flying slag, and flame brilliance at all times. (1) For gas welding and brazing, use number 3 or 4 green-shaded tempered lenses. (2) When gas welding aluminum, use cobalt-blue tint lenses. (3) When arc welding, including TIG, MIG, and plasma cutting; use number 9 to 12 green lenses and a full face-and-neck cov ering helmet. (4) Electronically darkening lenses pro vide number 3 to 12 automatic darkening as soon as the arc is ignited. b. Wear protective gloves, sleeves, aprons, and lace-up shoes to protect skin and clothing from sparks and slag. CAUTION: Keep all clothing and protective apparel absolutely free of oil or grease. 4-116. FIRST-AID KITS. Always keep a special welder’s first-aid kit where it is easily accessible. Burns are the most common welding accidents. 4-117.4-128. [RESERVED.] Page 4-82 Par 4-107PDF Image | AFS-640
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