Cal. Code Regs. tit. 8 § 5473

Current through Register 2024 Notice Reg. No. 50, December 13, 2024

Section 5473 - Specific Requirements

(a) The location of a system, as determined by the maximum total contained volume of hydrogen, shall be in the order of preference as indicated by Roman numerals in Table H-1.

Table H-1

		Size of Hydrogen System
Nature of Location	Less than 3,000 CF	3,000 CF to 15,000 CF	In Excess of 15,000 CF
Outdoors	I	I	I
In a separate building	II	II	II
In a special room	III	III	Not Permitted
Inside buildings not in a special room and exposed to other occupancies	IV	Not Permitted	Not Permitted

(b) The minimum distance in feet from a hydrogen system of indicated capacity located outdoors, in separate buildings or in special rooms to any specified outdoor exposure shall be in accordance with Table H-2.

(c) The distance in Table H-2, Items 1, 14 and 3 to 10 inclusive do not apply where protective structures such as adequate fire walls are located between the system and the exposure.

(d) Hydrogen systems of less than 3,000 CF when located inside buildings and exposed to other occupancies shall be situated in the building so that the system will be as follows:

(1) In an adequately ventilated area as in Section 5475(b).

(2) 20 feet from stored flammable materials or oxidizing gases.

(3) 25 feet from open flames, ordinary electrical equipment or other sources of ignition.

(4) 25 feet from concentrations of people.

(5) 50 feet from intakes of ventilation or air conditioning equipment and air compressors.

(6) 50 feet from other flammable gas storage.

(7) Protected against damage or injury due to falling objects or working activity in the area.

(8) More than one system of 3,000 CF or less may be installed in the same room, provided the systems are separated by at least 50 feet. Each such system shall meet all of the requirements of this Section.

Table H-2

				Size of Hydrogen System
Type of Outdoor Exposure				Less than 3,000 CF	3,000 CF to 15,000 CF	In Excess of 15,000 CF
1.	Building or		Wood Frame Construction*	10	25	50
	Structure		Heavy Timber, Noncombustible or Ordinary Construction*	0	10	25*
			Fire Resistive Construction*	0	0	0
2.	Wall Openings		Not above any part of a system	10	10	10
			Above any part of a system	25	25	25
3.	Flammable liquids		0-1,000 gallons	10	25	25
	above ground		In excess of 1,000 gallons	25	50	50
4.	Flammable liquids		Tank	10	10	10
		below ground--
		0-1,000 gallons	Vent or fill opening of tank	25	25	25
5.	Flammable liquids		Tank	20	20	20
	below ground--
	in excess of 1,000 gallons		Vent or fill opening of tank	25	25	25
6.	Flammable gas storage		0-15,000 CF capacity	10	25	25
		age, either high
	pressure or low pressure		in excess of 15,000 CF capacity	25	50	50
7.	Oxygen Storage		12,000 CF or less	Refer to NFPA No. 51, Gas Systems for Welding and Cutting
			More than 12,000 CF	Refer to NFPA No. 50, Bulk Oxygen Systems at Consumer Sites
8.	Fast burning solids such as ordinary lumber, excelsior or paper			50	50	50
9.	Slow burning solids such as heavy timber or coal			25	25	25
10.	Open flames and other sources of ignition			25	25	25
11.	Air compressor intakes or inlets to ventilating or air-conditioning equipment			50	50	50
12.	Concentration of people***			25	50	50
13.	Public Sidewalks			15	15	15
14.	Line of adjoining property which may be built upon			5	5	5

* Refer to NFPA No. 220, Standard Types of Building Construction for definitions of various types of construction.

** But not less than one-half the height of adjacent side wall of the structure.

*** In congested areas such as offices, lunchrooms, locker rooms, time-clock areas and places of public assembly.

Cal. Code Regs. Tit. 8, § 5473

1. Editorial correction of Table H-2 (Register 76, No. 9).