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

Current through Vol. 24-12, July 15, 2024
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.