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. 29.7046 - Residential fueling facility
Rule 46. Sections 4-9 to 4-9.11 of the storage and handling of gaseous and Liquefied H2 code are added as follows:
4-9 Residential fueling facility (RFF).
4-9.1 Application. This section applies to the design, construction, installation, and operation of an RFF.
4-9.2 Storage of H2 in quantities not exceeding 3,500 scf (99 cubic meters) at 12,500 psig shall be permitted in systems listed by a national recognized testing laboratory.
4-9.2.1 The RFF may store H2 indoors or outdoors. Indoor storage of H2 shall not exceed 3,500 scf (99 cubic meters) at 7,700 psig provided that indoor storage is ventilated per section 4-3.7, or storage shall be in a separate sealed enclosure ventilated directly to outdoors.
4-9.3 System component qualifications. System components not part of a listed fueling appliance shall comply with the appropriate provisions of chapter 2.
4-9.3.1 Fueling appliances shall be listed.
4-9.4 General safety requirements. All equipment related to RFF installation shall be protected to minimize the possibilities of physical damage and vandalism. The use of an enclosure for the compressor package, similar to that of a central air conditioner, shall be permitted to satisfy this requirement.
4-9.4.1 All equipment related to RFF installation shall be designed for the pressure, temperature, and service expected.
4-9.4.2 Vehicles shall not be considered a source of ignition.
Exception: Vehicles containing fuel-fired equipment, such as recreational vehicles, shall be considered a source of ignition unless this equipment is shutoff completely before entering an area in which ignition sources shall not be permitted.
4-9.4.3 Unless specifically permitted in the manufacturer's recommendations, multiple RFFs shall not be manifolded together on the discharge side.
4-9.4.4 Where more than 1 RFF is located in a common area, spacing between the RFFs shall not be less than 3 feet (1 meter) unless permitted by the manufacturer's recommendations.
4-9.5 Installation.
4-9.5.1 General. All RFF equipment shall include manufacturer's recommendations and such recommendations shall include, but may not be limited to, the requirements for the proper installation, operation, and maintenance of the RFF. The RFF shall be installed, operated, and maintained in accordance with the manufacturer's recommendations.
4-9.5.1.1 The RFF shall have a nameplate marked with minimum and maximum gas inlet pressure and flow rate, gas outlet maximum pressure, and electrical requirements.
4-9.5.2 Indoors. Where it is necessary to install the compression unit and refueling connections indoors, the compression unit shall be mounted or otherwise located such that the compression unit is vented outdoors.
4-9.5.2.1 Where the RFF or the vehicle being fueled is located indoors, a gas detector set to operate at 1/5 25% the lower limit of flammability of H2 shall be installed in the room.
4-9.5.2.2 The detector shall be located within 6 inches (15.2 centimeters) of the ceiling or the highest point in the room.
4-9.5.2.3 The detector shall stop the flow of H2 and operate an audible or a visual alarm.
4-9.6 Installation of pressure relief valves shall have pressure relief device vents or vent lines to convey escaping gas to the outdoors and then upward to a safe area to prevent impinging on buildings, other equipment, or areas open to the public, such as sidewalks.
4-9.7 Piping and hose. A fueling hose shall be limited to a maximum length of 25 feet (7.62 meters) and shall be protected from mechanical damage from abrasion and from being driven over by a vehicle.
4-9.7.1 Transfer systems shall be capable of depressurizing the nozzle to facilitate disconnection. Bleed connections shall lead to a safe point of discharge.
4-9.8 Testing. All piping and tubing shall be tested after assembly according to section 2-6.
4-9.9 Installation of emergency shutdown equipment. An RFF shall be equipped with emergency manual shut down of the fuel supply prior to the RFF device. The emergency manual shutdown actuator shall be at least 5 feet (1.52 meters) from the RFF and in view of the RFF.
4-9.9.1 Breakaway protection shall be provided in a manner so that, in the event of a pull away, H2 ceases to flow.
4-9.9.1.1 The breakaway devices shall comply with ANSI/CSA HGV 4.4, "breakaway devices for dispensing systems," adopted by reference in section 8-1.
4-9.9.1.2 A breakaway device shall be installed at every dispensing point.
4-9.9.1.3 The breakaway device in 4-9.8.2.3 shall be arranged to separate using a force not greater than 150 pounds (75 kilograms) when applied in a horizontal direction.
4-9.10 Operation. An RFF shall be operated in accordance with the manufacturer's instructions.
4-9.10.1 A fuel supply container shall not be charged in excess of its maximum allowable service pressure at normal temperature.
4-9.10.2 U.S. DOT containers shall be charged in accordance with U.S. DOT regulations.
4-9.10.3 Where H2 is being transferred to a motor vehicle, the engine shall be turned off.
4-9.11 Maintenance and inspection. All RFF equipment shall be inspected and maintained in accordance with the manufacturer's instructions.
