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55-6 STORAGE,USE,AND HANDLING OF COMPRESSED AND LIQUEFIED GASES IN PORTABLE CYLINDERS Valve Protective Cap. A rigid, removable cover provided (d) Storage areas shall be permitted to be covered with cano- for compressed gas container valve protection. pies of noncombustible construction. 2-1.6.2 Indoor Storage. Heated indoor storage areas shall Chapter 2 Storage be arranged so that stored cylinders or other containers can- not be spot heated or heated above 125°F (51.7°C). 2-1* General Storage Requirements. 12-1.6.3* Other General Storage Requirements. The follow- 2-1.1 This chapter shall apply to the storage of all corn- ing are general storage requirements: dressed'and liquefied gases. (a) When two or more compressed gases are stored in a gas 24.2 Storage areas shall be secured against unauthorized cabinet, the gases shall be compatible. (See Table 2-1.5.) J entry. (b) Spill control,drainage,and secondary containment shall 2-1.3 Gases shall be separated in storage in accordance with not be required for the storage of compressed gases. Table 2-1.5.When a gas is classified in more than one category, (c) Floors of storage areas shall be of noncombustible or all compatibilities shall be checked and the most stringent limited-combustible construction. separation shall be used. (d) Shelves used for the storage of cylinders shall be of non- �\l 2-1.4 Flammable gases shall be stored in accordance with combustible construction and designed to support the this standard and,the following: weight of the cylinders stored. (e) For separation from incompatible or combustible materi- (a) NFPA 50A, Standard for Gaseous Hydrogen Systems at Con- als, storage of compressed gases shall be completed in sumer Sites, for hydrogen at consumer sites either of the following ways: (b) NFPA 51, Standard for the Design and Installation of Oxygen- 1. Segregated from any incompatible or combustible Fuel Gas Systems for Welding, Cutting, and Allied Processes, materials storage by a minimum distance of 20 ft for acetylene and other fuel gases used in welding, cut- (6.1 m) 51 ting, and similar applications within the scope of NFPA 2, Isolated from any incompatible or combustible mate- rial storage by a barrier of noncombustible material (c) NFVA 58, Liquefied Petroleum Gas Code, for butane, pro- at least 5 ft (1.5 m) high that has a minimum fire pane, and other gases under the scope of NFPA 58 resistance rating of%s hour 2-1.5* Toxic gases shall be stored in accordance with Table 2-2 Flammable Gases. 2-1.5 and Chapter 3. 2-2.1 The following general requirements for storage of flam- mable gases shall apply. liquid,surfacing of noncombustible material shall be provided 2.2 1.1 The storage location of nonliquefied flammable gas _J under the liquid transfer connections of the storage container. cylinders in buildings shall be determined by the total volume 2-1.6.1 Outdoor Storage. Outdoor storage areas shall have of flammable gas and shall be in the order of preference as a minimum of 25 percent of the perimeter open to the atmo- indicated by roman numerals in Table 2-2.1.1. sphere. This open space shall be permitted to incorporate 2-2,1.2 Storage of compressed flammable gases in other than Ichain link fence, lattice construction, open block, or similar industrial and storage occupancies shall not exceed the quanti- materials for the full height and width of the opening. The ties listed in Table 1-1.2(b).Storage of compressed flammable following are requirements for outdoor storage: gases in mercantile and business occupancies shall be limited (a) Storage areas shall be kept clear of dry vegetation and to 400 scf(11.3 ms). Storage of liquefied flammable gases in combustible materials for a minimum distance of 15 ft all occupancies shall be in accordance with NFPA 58,Liquefied (4.6 m). Petroleum Gas Code. (b) Cylinders stored outside shall not be placed on the Exception: Facilities that primarily distribute gases and related ground (earth) or on surfaces where water can accumu- equipment that are open to the public. late. 2-2.1.3 Electrical equipment shall conform to the provisions (c) Storage areas shall be provided with physical protection of NFPA 70, National Electrical Codeg, Article 501 for Class I, from vehicle damage. Division 2 locations. i) Table 2-1.5 Separation of Gas Cylinders by Hazard Gas Hazard Category Nonflammable Oxidizing Flammable Pyrophoric Toxic Toxic C 20 It (6.1 in) 20 It (6.1 m) 20 ft (6.1 m) - Pyrop�oric C 20 ft (6.1 m) 20 It (6.1 m) - 20 ft (6.1 m) Flammable C 20 ft (6.1 m) - 20 ft (6.1 m) 20 ft (6.1 m) Oxidizing C - 20 I't (6.1 m) 20 ft (6.1 m) 20 ft (6.1 m) Nonflammable - C C C C Notes: ' 1 'C ='!C6mpa0ble.No separation required. 2. The;20-ft (6.1 m) distance shall be permitted to be reduced without limit when separated by a barrier of noncombustible materials at least 5 ft (1.5 m) high that has a fire resistance rating of at least�i hour. 1998 Edition