Cal. Code Regs. tit. 8, § 5492
(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)
Nature of Location
39.63 (150 liters) to 50
51 to 300
301 to 600
In excess of 600
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 permitted
Not permitted
Not permitted
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
Type of Exposure
39.63 (150 liters) 3,500
3,501 to 15,000
15,001 to 30,000
1.
Fire-resistive Building and Fire Walls*
5
5
5
2.
Noncombustible Building*
25
50
75
3.
Other Buildings*
50
75
100
4.
Wall Openings, Air Compressor Intakes, Inlets for Air-Conditioning or Ventilating Equipment
75
75
75
5.
Flammable Liquids (Above-ground and Vent or Fill Openings if Below Ground) (See 5491(c) and (d))
50
75
100
6.
Between Stationary Liquefied Hydrogen Containers
5
5
5
7.
Flammable Gas Storage
50
75
100
8.
Liquid Oxygen Storage and other Oxidizers (See 5491(c) and (d))
100
100
100
9.
Combustible Solids
50
75
100
10.
Open Flames, Smoking and Welding
50
50
50
11.
Concentrations of People**
75
75
75
12.
Public Ways, Railroads, and Property Lines
25
50
75
* Refer to NFPA No. 220, “Standard Types of Building Construction,” for definitions of construction types.
** 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.
1. Amendment of Table H-4 filed 3-2-76; effective thirtieth day thereafter (Register 76, No. 10).