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55-4 STORAGE,USE,AND HANDLING OF COMPRESSED AND LIQUEFIED GASES IN PORTABLE CYLINDERS NFPA 55 (k)* Flammable gases used as a vehicle fuel when stored on Stand the vehicle O �rcl for the l * The handling and use of compressed or liquefied gases Storage, Use, and Handling of in laboratory work areas covered by NFPA 45, Standard on Fire Protection for Laboratories Using Chemicals Compressed and Liquefied Gases in Portable Cylinders 1-2 Alternate Materials and Procedures. The provisions of this standard are not intended to prevent the use of any mate- 1998 Edition rial, method of construction, or procedure not specifically prescribed herein, provided any such alternate is acceptable I 1 NOTICE: An asterisk(*)following the number or letter des- to the authority having jurisdiction. (See Section 1-4.)The au- J ignating a paragraph indicates that explanatory material on thority having jurisdiction shall require that sufficient evi- the paragraph can be found in Appendix A. dence be submitted to substantiate any claims made regarding Information on referenced publications can be found in the safety of such alternates. Chapter 8 and Appendix B. 1-3 Training. Persons responsible for or working in the areas where compressed gases are produced, stored, handled, or Chapter 1 General used shall be trained in the chemical and physical properties /) of the materials and the appropriate-emergency response. 1-1 Scope. 14 Definitions. For the purpose of the standard,the follow- 1-1.1 This standard applies to the storage,use,and handling ing terms are defined. of compressed and liquefied gases in portable cylinders in all Absolute Pressure. Pressure based'on a zero reference occupancies. point, the perfect vacuum. Measured from this reference 1-1.2 This standard shall not apply to the following: point, the standard atmospheric pressure at sea level is 14.7 I (a)* Off-site transportation of compressed gases psia (an absolute pressure of 101 kPa). Absolute pressure is b commonly denoted as psia. ( ) Storage,use,and handling of cylinders at gas ntanufac- turer and distributor facilitie> - Approved.* Acceptable to the authority having jurisdio- (c). Storage, use, and handling of radioactive gases tion. (d)* Storage, use, and handling of medical gases at health ASTM. American Society for Testing and Materials. care facilities (e)* Cryogenic liquids in bulk and* portable containers Authority Laving Jurisdiction.* The organization, office, approving equipment,I or individual responsible for aiipment,an installa- (f) Systems for gases,each containing more than 20,000 scf /) (566 ms) of oxygen,3000 scf(85 m3)of hydrogen,5000 tion, or'a procedure. scf(142 in of acetylene CFR. Code of Federal Regulations. (g) Gas systems consisting only of hydrogen (Such systems CGA. The Compressed Gas Association. shall be in accordance with NFPA 50A, Standard for Gas- eous Hydrogen Systems at Consumer Sites.) Compressed Gas(Nonliquefied). A gas,other than in so- (h)* Storage and use of more than a total of 735 lb (333 kg) lution, that in a packaging under thecharged pressure is water capacity [nominal 300 lb (136 kg) propane] of entirely gaseous at a temperature of 68n F (20'C). liquefied flammable gases Continuous Gas Detection System. A gas detection system (i) Systems consisting of a single cylinder of oxygen and a where the instrument is maintained in continuous operation single cylinder of fuel gas used for welding and cutting and the interval between sampling of any point does not 0) Compressed and liquefied gases in use or in separate exceed 30 minutes. storage areas in quantities less than those specified in Cryogenic Liquid. A liquid having a boiling point lower Table 1-1.2(a) and Table 1-1.2(b), except as specified than -150T (-101°C) at 14.7 psia (an absolute pressure of elsewhere in this standard 101 kPa). Table 1-1.2(a) Quantities Exempt front the Requirements of NFPA 55 in Industrial,Mercantile,and Storage Occupancies Unsprinklered Areas Sprinklered Areas No Cabinet Cabinet No Cabinet Cabinet Toxic Gas (Health 4)" 0 scf(0 m) 20 scf(0.57 m3) 0 scf(0 ms) 40 scf(l.l ms) Toxic Gas (Health 3)" Liquefied 100 Ib (45.3 kg) 200 Ib (90.7 kg) 100 lb (45.3 kg) 200 lb (90.7 kg) Compressed 400 scf(11.3 m) 650 scf(18.4 m) 400 scf(11.3 ms) 650 scf(18.4 m3) Pyrophoric Gas 500 scf(14.1 m3) 500 scf(14.1 nt) 1500 scf(42.5 ms) 1500 scf(42.5 ms) Flammable Gas Liquefied 100 lb (45.3 kg) 100 Ib (45.3 kg) 100 Ib (45.3 kg) 100 Ib (45.3 kg) Compressed 400 scf(11.3 m) 400 scf(11.3 m) 400 scf(11.3 m) 400 scf(11.3 m) Oxidizing Gas 400 scf(11.3 m) 400 scf(11.3 m3) 400 scf(11.3 m3) 400 scf(11.3 ms) Nonflammable Gas 1000 scf(28.3 m3) 1000 scf(28.3 m3) 2000 scf(56.6 m3) 2000 scf(56.6 m3) "Health hazard rating in accordance with NFPA 704, Standard System for the Identification of the Hazards of Materials for Emergency Response. 1998 Edition