Mich. Admin. Code R. 29.7097
Rule 97. Sections 3-1.1 and 3-1.3 to 3-1.5 are reproduced from NFPA 50B, and sections 3-1.2, 3-1.6 to 3-1.13 of the storage and handling of gaseous and Liquefied H2 code is added as follows:
3-1 General requirements.
3-1.1 The storage containers shall be located so that they are readily accessible to mobile supply equipment at ground level and to authorized personnel. Roadways or other means of access for emergency equipment, such as fire department apparatus, shall be provided.
3-1.2 Systems shall not be located beneath or where exposed by failure of the following:
3-1.4 Storage sites shall be fenced and posted to prevent entrance by unauthorized personnel. Sites also shall be placarded as follows:
LIQUEFIED HYDROGEN FLAMMABLE GAS NO SMOKING - NO OPEN FLAMES
3-1.5 If liquefied hydrogen is located (as specified in table 3-2.1) in a separate building, in a special room, or inside buildings where not in a special room or exposed to other occupancies, containers shall have the pressure relief devices vented unobstructed to the outdoors at a minimum elevation of 25 ft (7.6 m) above grade to a safe location as required in 2-2.3.
3-1.6 Underground systems shall be located underground, mounded, or partially buried and outside of any buildings. Buildings shall not be constructed over any underground, mounded, or partially buried container. Sides of adjacent containers shall be separated by not less than 3 feet (1 meter).
3-1.7 All underground containers shall be set on firm foundation and surrounded with 6 inches (15.24 centimeters) minimum of noncorrosive inert material such as clean sand or pea gravel.
3-1. 8 Underground or mounded containers shall be covered with not less than 2 feet (60.96 centimeters) of earth or with not less than 1 foot (30.48 centimeters) of earth on top of which shall be placed a reinforced concrete slab not less than 4 inches (10.16 centimeters) thick. If containers are likely to be subjected to traffic, they shall be protected against damage from vehicles passing over them by at least 3 feet (1 meter) of earth cover plus 6 inches (15.24 centimeters) of reinforced concrete. When reinforced concrete paving is used as part of the protection, it shall extend at least 1 foot (30.48 centimeters) horizontally beyond the outline of the container in all directions.
3-1.9 Containers installed in an area subject to flooding, high water table, or other buoyant forces shall be safeguarded from movement by anchoring or other means acceptable to the department based on the best interests of public health, safety, and welfare and the environment.
3-1.10 Where a liquefied H2 container is installed on ground that is level with or lower than the adjacent storage of all classes of flammable and combustible liquid or liquid oxygen, suitable protective means shall be taken to prevent accumulation of liquids within 50 feet (15.2 meters) of the liquefied H2 container. Protective means shall include diking, diversion curbs, or grading of the flammable and combustible liquid storage or liquid oxygen storage.
3-1.11 Aboveground liquefied H2 systems shall be fenced and posted to prevent entrance by unauthorized personnel.
Exception: Liquefied H2 dispensers may be located outside the fence.
3-1.12 Underground installations shall be deemed to provide engineered protection from overhead power lines.
3-1.13 Venting of underground containers. Venting systems for underground storage containers shall be in accordance with CGA G-5.5, adopted by reference in section 8.
Mich. Admin. Code R. 29.7097