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A=COM 4.7.11 Before a regulator is removed from a cylinder, close the cylinder valve and release all pressure from the regulator.This procedure also serves as a check to confirm that the main cylinder valve is completely closed. 4.7.12 Never hammer the valve wheel in attempting to open or close the valve. 4.7.13 No person, except the owner of the cylinder or person authorized by the owner, shall refill a cylinder(Exceptions to this includes the filling of self-contained breathing apparatus cylinders with Grade D breathing air, or the filling of the[Foxboro] Organic Vapor Analyzer(OVA)hydrogen cylinders). Disposable cylinders shall not be refilled with any material after use of the original contents. 4.7.14 Cylinders of compressed gas shall be stored in areas where they are protected from external heat sources such as flame impingement, intense radiant heat, electric arc, or high-temperature steam lines. 4.7.15 Cylinders are to be stored in an assigned,well-ventilated area, with full and empty cylinders stored separately. Empty cylinders shall be marked `empty'. 4.7.16 Stored fuel gases and oxygen cylinders are to be separated by at least 20 feet, or by a fire wall at least 5 feet high that has a fire-resistance rating of at least'/2 hour. 4.7.17 Compressed gas cylinders shall only be stored or transported in an upright or vertical position. Horizontal storage or transportation of cylinders shall be conducted only as permitted by the applicable jurisdiction and in accordance with regulatory requirements (e.g., secured by chocks or ties to prevent rolling,foot plate, etc.). 4.7.18 Cylinders are to be secured to a fixed object by chain or equivalent fastening device whenever they are placed in an upright position. The protective cap is not to be removed or the cylinder valve opened until the cylinder is secured. 4.7.19 Repair of leaks shall never be attempted on a pressurized system. System pressure should be reduced to atmospheric pressure as rapidly as possible, and the Manager notified immediately. 4.7.20 Compressed gas cylinders shall be legibly marked for the purpose of identifying the gas content with either the chemical or the trade name of the gas. Such marking is to be done by means of stenciling, stamping or labelling, and shall not be readily removable.Whenever practical, the marking is to be located on the shoulder of the cylinder. Positive identification of the gas in any cylinder is required before connecting cylinders for use. 4.7.21 Gas cylinders moved by hoist shall be handled in suitable cradles or job-made"skip" (materials) boxes.Any slings used for this purpose shall be specifically designed for that cylinder handling. 4.7.22 Cylinders shall not be placed where they might form part of an electrical circuit. 4.7.23 Transfer of compressed gases(including acetylene)from one cylinder to another, or mixing of gases in a cylinder, is prohibited. 4.7.24 Oxygen cylinders are never to be stored near: • Highly combustible materials, especially oil and grease; • Reserve stocks of acetylene or other fuel gas cylinders; and • Any other substance likely to cause or accelerate fire. 4.7.25 Compressed oxygen is never to be used: • As breathing air; • To purge pipelines,tanks, or any confined area; • To supply a head-pressure tank; • In pneumatic tools; Compressed Gases(S3AM-114-PR1) Revision 3 September 30,2020 PRINTED COPIES ARE UNCONTROLLED. CONTROLLED COPY IS AVAILABLE ON COMPANY INTRANET. 6 of 12