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 California Code of Regulations (Last Updated: August 6, 2014)
 Title 8. Industrial Relations
 Division 1. Department of Industrial Relations
 Chapter 4. Division of Industrial Safety
 Subchapter 7. General Industry Safety Orders
 Group 20. Flammable Liquids, Gases and Vapors
 Article 138. Hydrogen

  § 5492. Specific Requirements.  

Latest version.
  • (a) The location of liquefied hydrogen storage, as determined by the maximum total quantity of liquefied hydrogen, shall be in the order of preference as indicated by Roman numerals in the following Table H-3:
    Table H-3 Maximum Total Quantity of Liquefied Hydrogen Storage Permitted
    Size of Hydrogen Storage (Capacity in Gallons)
    39.63
    In excess
    Nature of Location
    (150 liters)
    51 to 300
    301 to 600
    of 600
    to 50
    Outdoors
    I
    I
    I
    I
    In a separate building
    II
    II
    II
    Not permitted
    In a special room
    III
    III
    Not permitted
    Not permitted
    Inside buildings not in
    a special room and
    exposed to other
    occupancies
    IV
    Not
    Not
    Not
    permitted
    permitted
    permitted
HISTORY
1. Amendment of Table H-4 filed 3-2-76; effective thirtieth day thereafter (Register 76, No. 10).

Note

Note: This table does not apply to the storage in dewars of the type generally used in laboratories for experimental purposes.
(b) The minimum distance in feet from liquefied hydrogen systems of indicated storage capacity located outdoors, in a separate building, or in a special room to any specified exposure shall be in accordance with Table H-4.
Table H-4 Minimum Distance (feet) from Liquefied Hydrogen Systems to Exposures
Liquefied Hydrogen Storage
39.63
3,501
15,001
Type of Exposure
(150 liters)
to
to
3,500
15,000
30,000
1. Fire-resistive Building and
5
5
5
Fire Walls [FNa1]
2. Noncombustible Building [FNa1]
25
50
75
3. Other Buildings [FNa1]
50
75
100
4. Wall Openings, Air Compressor
75
75
75
Intakes, Inlets for Air-
Conditioning or Ventilating Equipment
5. Flammable Liquids (Above-
50
75
100
ground and Vent or Fill
Openings if Below Ground)
(See 5491(c) and (d))
6. Between Stationary Liquefied
5
5
5
Hydrogen Containers
7. Flammable Gas Storage
50
75
100
8. Liquid Oxygen Storage and
100
100
100
other Oxidizers (See 5491(c) and (d))
9. Combustible Solids
50
75
100
10. Open Flames, Smoking and
50
50
50
Welding
11. Concentrations of People [FNaa1]
75
75
75
12. Public Ways, Railroads, and
25
50
75
Property Lines
[FNa1] Refer to NFPA No. 220, “Standard Types of Building Construction,” for definitions of construction types.
[FNaa1] In congested areas such as offices, lunchrooms, locker rooms, time clock areas, and places of public assembly.
Note: 1: The distances in Nos. 2, 3, 5, 7, 8, 9 and 12, in Table 2, may be reduced where protective structures, such as fire walls equal to height of top of the container, to safeguard the liquefied hydrogen storage system, are located between the liquefied hydrogen storage installation and the exposure. (See definition of Outdoor Location, Section 5415.)
Note: 2: Where protective structures are provided, ventilation and confinement of product shall be considered. The 5-foot distance in Nos. 1 and 6 facilitates maintenance and enhances ventilation.