Michigan Administrative Code
Department - Licensing and Regulatory Affairs
Bureau of Fire Services
Storage and Handling of Gaseous and Liquefied Hydrogen Systems
Part 2 - STORAGE AND HANDLING OF GASEOUS HYDROGEN NFPA 50A
Chapter 4 - Design considerations at specific locations
Section R. 29.7039 - Separate buildings
Current through Vol. 24-16, September 15, 2024
Rule 39. Sections 4-2.1, 4-2.4 to 4-2.6 are reproduced from NFPA 50A, and sections 4-2.2, and 4-2.3 of the storage and handling of gaseous and Liquefied H2 code are added as follows:
4-2 Separate buildings.
4-2.1 Separate buildings shall be constructed of noncombustible or limited-combustible materials. Windows and doors shall be located so as to be readily accessible in case of emergency.
Exception: Window glazing shall be permitted to be plastic.
4-2.2 Ventilation to the outdoors shall be provided. Inlet openings shall be located within 18 inches (30 centimeters) of the floor in exterior walls only. Outlet openings shall be located at the high point of the room in exterior walls or roof. Inlet and outlet openings shall each have a minimum total area of 1 square foot/1,000 cubic feet (1 square meters/305 cubic meters) of room volume. Discharge from outlet openings shall be directed or conducted to the atmosphere.
4-2.3 Deflagration venting shall be provided in exterior walls or roof only.
4-2.3.1 Vents shall be any 1 or any combination of the following:
(a) Walls of light material.
(b) Lightly fastened hatch covers.
(c) Lightly fastened, outward opening doors in exterior walls.
(d) Lightly fastened walls or roof.
(e) Other methods in accordance with NFPA 69. 4-2.3.2 Where applicable, snow loads shall be considered.
4-2.4 There shall be no sources of ignition from open flames, electrical equipment, or heating equipment.
4-2.5 Electrical equipment shall be in accordance with Article 501 of NFPA 70, National Electrical Code, for Class I, Division 2 locations.
4-2.6 Heating, if provided, shall be by steam, hot water, or other indirect means except that electrical heating may be used if in compliance with 4-2.5.
