Mich. Admin. Code R. 29.7098
Rule 98. Sections 3-2.1, 3-2.4 and table 3-2.1 are reproduced from NFPA 50B, and sections 3-2.2, 3-2.2.1, 3-2.3, 3-2.5 to 3-2.8 and table 3-2.2 of the storage and handling of gaseous and Liquefied H2 code are added as follows:
3-2 Specific requirements.
3-2.1 The location of liquefied hydrogen storage, as determined by the maximum total quantity of liquefied hydrogen, shall be in the order of preference indicated by the Roman numerals in table 3-2.1.
Table 3-2.1 Preferred Locations of Liquefied Hydrogen Systems
| Nature of Location | Size of Hydrogen Storage |
| 39.63 gal to 50 gal (150 L to 189.25 L) | 51 gal to 300 gal (193.03 L to 1135.5 L) | 301 gal to 600 gal (1139.29 L to 2271 L) | In excess of 600 gal (2271 L) | |
| 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 or exposed to other occupancies | IV | Not permitted | Not permitted | Not permitted |
3-2.2 The minimum distance in feet from liquefied H2 systems of indicated storage capacity located either outdoors, in a separate building, or in a special room to any specified exposure shall be in accordance with table 3-2.2.
Exception: The distances in numbers 1, 4, 6, 7, 8, and 11 in table 3-2.2 may be reduced by 2/3, but not to less than 5 feet (1.5 meters), for insulated portions of the systems. For uninsulated portions of the system, the distances may be reduced by the use of protective structures having a minimum fire resistance rating of 2 hours. The protective structure or the insulated liquefied H2 container shall interrupt the line of sight between uninsulated portions of the liquefied H2 storage system and the exposure.
Exception: The restrictions in section 3-2.2(a) shall not apply to an aboveground H2 system used exclusively for stationary power generation.
3-2.2.1 Loose or piled combustible materials and weeds and long dried grass shall not be permitted within 10 feet (3.1 meters) of any system.
Table 3-2.2 Minimum Distance from Liquefied Hydrogen Systems to Exposures
| Total Liquefied H2 Storage | |||
| Type of Exposure | 39.63 gal to 3,500 gal (ft) | 3,501 gal to 15,000 gal (ft) | 15,001 gal to 75,000 gal (ft) |
| 1. Building or structure | |||
| (a) Wall(s) adjacent to system constructed of non-combustible or limited-combustible materials | |||
| (1)Sprinklered building or structure or unsprinklered building or structure having noncombustible contents | 5a | 5a | 5a |
| (2) Unsprinklered building or structure with combustible contents. | 25 | 50 | 75 |
| Adjacent wall(s) with fire resistance rating less than 3 hoursb | |||
| Adjacent wall(s) with fire resistance rating of 3 hours or greaterb | 5 | 5 | 5 |
| (b) Wall(s) adjacent to system constructed of combustible materials (1) Sprinklered building or structure | 50 | 50 | 50 |
| (2) Unsprinklered building or structure | 50 | 75 | 100 |
| 2. Wall openings (a) Openable | 75 | 75 | 75 |
| (b) Unopenable | 25 | 50 | 50 |
| 3. Air compressor intakes or inlets for air-conditioning or ventilating equipment | 75 | 75 | 75 |
| 4. All classes of flammable and combustible liquid containers (above ground, and vent or fill openings if below ground) (see -1.3)c | 50 | 75 | 100 |
| 5. Between stationary liquefied H2 containers | 5 | 5 | 5 |
| 6. Flammable gas storage other than H2 | 50 | 75 | 75 |
| 7. Liquid oxygen storage and other oxidizers (see 3&1.3) | 75 | 75 | 75 |
| 8. Combustible solids | 50 | 75 | 100 |
| 9. Open flames and welding | 50 | 50 | 50 |
| 10. Places of public assembly for 50 or more persons | 75 | 75 | 75 |
| 11. Public ways, railroads, and property lines | 25 | 50 | 75 |
| 12. Inlet to underground sewers | 10 | 10 | 10 |
| 13. Places of public assembly less than 50 people | 25 | 50 | 50 |
| 14. Flammable/Combustible liquid dispenser other than H2 | 10 | 10 | 10 |
| For SI units: 1 ft = 0.305 m; 1 gal = 3.785 L. a Portions of wall less than 10 ft (3 m) (measured horizontally) from any part of a system shall have a fire resistance rating of at least 1/2 hour. b Exclusive of windows and doors. c Distances can be reduced to 15 ft (4.6 m) for class IIIB combustible liquids. | |||
3-2.3 Cargo transport unloading. Unloading connections on delivery equipment shall not be positioned closer to any of the exposures cited in table 3-2.2 than the distances given for the storage system. The following shall apply:
Exception: Bulkheads will be located at a minimum of 1.5 feet (45.72 centimeters) when crash protection is provided at 10 feet (3.1 meters) from storage container.
3-2.4 The minimum distance of container fill connections from parked vehicles shall be 25 ft (7.6 m).
3-2.5 An owner and operator shall ensure that a container systems are properly designed and constructed in accordance with the ASME and that any portion, which is underground, mounded, or partially underground, is protected from corrosion by either of the following:
3-2.6 Out-of-service aboveground containers.
3-2.6.1 Containers that are no longer in service for a period of 12 months shall be closed. To close the aboveground container, the owner or operator shall empty the container, purge it with an inert gas and safeguard it against tampering. Piping that is removed from service shall be purged with an inert gas and capped or removed.
3-2.6.2 Each container that is to be reused at the original location or a new location shall be purged with an inert gas and be in compliance with all the requirements for the installation of a new container, and shall be recertified by the manufacturer, or authorized representative, and tested in accordance with the container's design specifications or be pressure tested with an inert gas or H2 at 1.1 times the MOP for not less than 10 minutes. Piping that is to be reused shall be in compliance with all the requirements for the installation of new piping and shall be tested in compliance with section 3-2.8 of this code prior to being brought back into service.
3-2.7 Out-of-service underground, mounded, and partially buried containers.
3-2.7.1 Containers that are no longer used to store H2 and are not intended to be brought back into service shall be permanently closed. To permanently close the container, the container shall be emptied and purged with an inert gas to render the container free of H2, and then the container shall be removed from the ground. When a structure above or near the container prevents removal, the container shall be emptied and purged with an inert gas to render the container free of H2, then the container shall be filled with an inert solid material. Piping that is permanently removed from service shall be purged with an inert gas and capped or removed.
3-2.7.2 Containers may be rendered temporarily out-of-service only when it is intended they be brought back into service at a later date. To temporarily close a container, all of the following requirements shall be met:
3-2.7.2.1 Each container that is temporarily out-of-service greater than 12 months shall be pressure tested with an inert gas at 1.1 times the MOP for not less than 10 minutes prior to being brought back into service. Temporarily out-of-service piping shall be tested in compliance with section 3-2. 8 of this code prior to being brought back into service.
3-2.8 Testing. After installation, prior to being placed into service, all container connections, piping, tubing, hose, and hose assemblies shall be tested by an approved method as outlined in ASME B31.3 "Process Piping," adopted by reference in section 8, or by a method acceptable to the department based on the best interest of public health, safety, and welfare, and the environment.
Mich. Admin. Code R. 29.7098