California Code of Regulations › 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 › Section 5492 - Specific Requirements

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
(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).