Gas Cylinder Safety Guidelines

13 Gas Cylinder Safety Guidelines solutions (soap and water) or leak test instruments. • Release pressure fromsystems before connections are tightened or loosened and before any repairs. • Fluorescent light can be used to check for grease or oil in regulators and valves. • Valve and Regulator Maintenance ¤¤ Know the valve and regulator maintenance histories before use. ¤¤ Valves and regulators should undergo periodic maintenance and repair as necessary. ¤¤ Perform a visual inspection before each use to detect any damage, cracks, corrosion, or other defects. ¤¤ Valves that pass visual inspection are still subject to failure. It is critical that toxic or poisonous gases (see Appendix II) are used in ventilated enclosures (fume hood, ventilated cabinet) and have local exhaust ventilation in place for downstream pressure relief valves. ¤¤ Long term maintenance or replacement periods vary with the types of gases used, the length of use, and conditions of use. Consult the cylinder, regulator, or gas supplier for recommended valve and regulator maintenance schedules. ¤¤ Valves and regulators should only be repaired by qualified individuals. Consult valve and regulator manufacturers, gas supply companies, or valve and regulator specialty shops for any repair needs. Labeling The following labeling requirements apply to all gas cylinders: • Use only the vendor label for positive identification of contents of the cylinder. Be aware that color coding may be inconsistent from vendor to vendor. • Mixed gases must be clearly labeled with the contents of the cylinder. • Empty cylinders must be labeled with the word “empty.” • Know the contents of each cylinder you are using. Preferred labeling includes the identity of the material, statement of hazard and the associated signal word. For example, the preferred label for nitrogen is shown in the left margin. Use these sources of information for the warning and hazard information required on cylinders: • Air Products. • Matheson and other gas company catalogs.