Band-specific practices: Storage Store full and empty cylinders separately to avoid confusion. Serious back flow can occur when an empty cylinder is attached to a pressurized system. Select a cool, dry, and well-ventilated area. Cool areas minimize pressure increases that can result from heat or direct sunlight. Dryness deters rust and corrosion. Ventilation is essential in case of Never store compressed gas cylinders (with the exception of compressed air) in environmental rooms (i.e., refrigerated cold rooms or warm rooms). These rooms are not well ventilated and could pose a serious safety concern should a cylinder fail. Arrange storage facilities to permit inventory rotation, using cylinders in order as received from the supplier. Do not store cylinders next to doors or in corridors where they could possibly obstruct emergency exit from the building. Designate an area to store empty cylinders for return to the supplier. An area on or adjacent to your building's loading dock is suitable. Separate oxidizers or incompatibles (e.g., oxygen) from flammables by at least 20 feet, or by a non-combustible wall. Storage Guidelines Determine hazard class your gas belongs to by referring to the “Properties & Hazards” section above and the gas listing in Appendix A. Ensure it meets all requirements specified for the class as described in Appendix B and below. Implement these ideal storage practices for class IV compressed gas cylinders: Restrain cylinders - During the 1994 Northridge earthquake, gas cylinders that had been double-chained and bolted to a secure surface stayed in Single-chain restraints were not as successful. C-clamps did not work at all. Restrain cylinders as follows: Store cylinders upright and secure them to a substantial, fixed surface with upper and lower restraints made of non-combustible material, preferably chain and Unistrut®. Position the upper restraint no less than 1 foot from the shoulder of the cylinder. Position the lower restraint no less than 1 foot from the floor. C-clamps or bench mounting brackets are not allowed! Multiple cylinder restraint - Limit 3 cylinders to each double-chain restraint system. Properly label the cylinders and storage area. Cap cylinders when not in use. Store cylinders away from non-compatibles. Store empty cylinders separately from full cylinders.
APPENDIX B: UCI Hazardous Gas Classification Table Gas and Formula CAS and UN or NA No. UBC / CFC Class PEL Ammonia – NH3 7664–41–7, UN1005 Corrosive, flammable 50 ppm Arsine – AsH3 7784–42–1, UN2188 Highly toxic, flammable I 3 0.05 ppm Boron Tribromide – Bbr3 10294–33–4, UN2692 Toxic 1 ppm Boron Trichloride – BCl3 10294–34–5, UN1741 Corrosive 5 ppm Trifluoride – BF3 7637–07–2, UN1008 Toxic 1 ppm Bromine – Br2 7726–95–6, UN1744 Highly toxic, corrosive, oxidizer I 3 0.1 ppm I 2 C C
Ethylene Oxide – C2H40 75–21–8, UN1040 Flammable 1 ppm Fluorine – F2 7782–41–4, UN1045 Highly oxidizer 0.1 ppm Germane – GeH4 7782–65–2, UN2192 Toxic, flammable 6 0.2 ppm Hydrogen Bromide – HBr UN1048 Corrosive 3 ppm Hydrogen Chloride – HCl 7647–01–0, UN1050 Corrosive ppm Hydrogen Cyanide – HCN 74–90–8, UN1051 Highly toxic, flammable 10 ppm 2 5
Hydrogen Fluoride – HF 7664–39–3, UN1052 Toxic 3 ppm Hydrogen Selenide – H2Se 7783–07–5, UN2202 Highly flammable 1 0.05 ppm Hydrogen Sulfide – H2S 7783–06–4, UN1053 Toxic, flammable 20 ppm Methyl Bromide – 74–83–9, UN1062 Toxic, flammable 20 ppm Methylisocyanate – CH3NCO 624–83–9, UN2480 Highly toxic, flammable I 3 0.02 ppm Methyl Mercaptan – CH3SH 74–93–1, UN1064 Toxic, flammable 10 ppm Nickel Carbonyl – Ni(CO)4 UN1259 Highly toxic, flammable I 2 0.001 ppm I I
Nitric – NO 10102–43–9, UN1660 Highly oxidizer 25 ppm Nitrogen Dioxide – NO2 10102–44–0, UN1067 Highly toxic, oxidizer ppm Phosgene – COCl2 75–44–5, UN1076 Highly toxic I 5 0.1 ppm Phosphine – PH3 7803–51–2, UN2199 Highly toxic, pyrophoric I 0.3 ppm Phosphorus Oxychloride – POCl3 10025–87–3, UN1810 Highly toxic I 0.1 ppm Phosphorus Pentafluoride – PF 5 7647–19–0, UN2198 Toxic, oxidizer 3 ppm Phosphorus Trichloride – PCl3 7719–12–2, UN1809 oxidizer 0.5 ppm
Selenium Hexafluoride – SeF6 7783–79–1, UN2194 Highly toxic I 0.05 ppm (as Se) Silicon Tetrachloride – (HCl) 10026–04–7, UN1818 Toxic, corrosive 5 ppm Silicon Tetrafluoride – SiF4 (HF) 7783–61–1, UN1859 Toxic 0.1 ppm Stibine – SbH3 7803–52–3, UN2676 Highly toxic, flammable I 5 0.1 ppm Sulfur Dioxide – SO2 7446–09–5, UN1079 Corrosive 5 ppm Sulfuryl Fluoride – SO 2F2 2699–79–8, UN2191 Corrosive 5 ppm Tellurium Hexafluoride – TeF6 7783–80–4, UN2195 Highly toxic I 1 0.02 ppm (as Te)