ADOPTS WITH AMENDMENTS:

International Fire Code 2018 (IFC 2018)

Heads up: There are no amended sections in this chapter.

The storage and use of flammable gases and flammable cryogenic fluids shall be in accordance with this chapter and NFPA 55. Compressed gases shall also comply with Chapter 53 and cryogenic fluids shall also comply with Chapter 55. Flammable cryogenic fluids shall comply with Section 5806. Hydrogen motor fuel-dispensing stations and repair garages and their associated above-ground hydrogen storage systems shall also be designed, constructed and maintained in accordance with Chapter 23 and NFPA 2.

Exceptions:

  1. Gases used as refrigerants in refrigeration systems (see Section 606).
  2. Liquefied petroleum gases and natural gases regulated by Chapter 61.
  3. Fuel-gas systems and appliances regulated under the International Fuel Gas Code other than gaseous hydrogen systems and appliances.
  4. Pyrophoric gases in accordance with Chapter 64.
Permits shall be required as set forth in Section 107.2.
The storage and use of flammable gases in amounts not exceeding the maximum allowable quantity per control area in accordance with the applicable building code shall be maintained in accordance with Sections 5001, 5003, 5801 and 5803.

Flammable gases shall not be stored or used in Group A, E, I or R occupancies or in offices in Group B occupancies.

Exceptions:

  1. Cylinders of nonliquefied compressed gases not exceeding a capacity of 250 cubic feet (7.08 m3) or liquefied gases not exceeding a capacity of 40 pounds (18 kg) each at normal temperature and pressure (NTP) used for maintenance purposes, patient care or operation of equipment.
  2. Food service operations in accordance with Section 6103.2.1.7.
  3. Hydrogen gas systems located in a hydrogen fuel gas room constructed in accordance with Section 421 of the International Building Code.
Medical gas system supply cylinders shall be located in medical gas storage rooms or gas cabinets as set forth in Section 5306.
The aggregate quantities of flammable gases used for maintenance purposes and operation of equipment shall be maintained as to not exceed the maximum allowable quantity per control area indicated in the applicable building code.
Cylinders and pressure vessels for flammable gases shall be designed, constructed, installed, tested and maintained in accordance with Chapter 53.
Compressed gas systems conveying flammable gases shall be provided with approved manual or automatic emergency shutoff valves that can be activated at each point of use and at each source.
A manual or automatic fail-safe emergency shutoff valve shall be installed on supply piping at the cylinder or bulk source. Manual or automatic cylinder valves are allowed to be used as the required emergency shutoff valve where the source of supply is limited to unmanifolded cylinder sources.
A manual or automatic emergency shutoff valve shall be installed on the supply piping at the point of use or at a point where the equipment using the gas is connected to the supply system.

Ignition sources in areas containing flammable gases in storage or in use shall be controlled in accordance with Section 5003.7.

Exception: Fuel gas systems connected to building service utilities in accordance with the International Fuel Gas Code.

Static-producing equipment located in flammable gas storage areas shall be grounded.
"No Smoking" signs shall be posted at entrances to rooms and in areas containing flammable gases in accordance with Section 5003.7.1.
Electrical wiring and equipment shall be maintained in accordance with Chapter 6 and NFPA 70.
Exposed noncurrent-carrying metal parts, including metal gas piping systems, that are part of flammable gas supply systems located in a hazardous (electrically classified) location shall be bonded to a grounded conductor in accordance with the provisions of NFPA 70.
Static-producing equipment located in flammable gas storage or use areas shall be grounded.

Containers of liquefied flammable gases and flammable gases in solution shall be positioned in the upright position or positioned so that the pressure relief valve is in direct contact with the vapor space of the container.

Exceptions:

  1. Containers of flammable gases in solution with a capacity of 1.3 gallons (5 L) or less.
  2. Containers of flammable liquefied gases, with a capacity not exceeding 1.3 gallons (5 L), designed to preclude the discharge of liquid from safety relief devices.
The storage and use of flammable gases in amounts exceeding the maximum allowable quantity per control area indicated in Section 5003.1 shall be in accordance with Chapter 50 and this chapter.
Indoor storage of flammable gases in amounts exceeding the maximum allowable quantity per control area in accordance with the applicable building code, shall be maintained in accordance with Sections 5001, 5003 and 5004, this chapter, and the applicable building code.
Buildings or portions thereof containing flammable gases and provided with explosion control shall be maintained in accordance with Chapter 9 and remain in accordance with the applicable building code.
Outdoor storage of flammable gases in amounts exceeding the maximum allowable quantity per control area indicated in Table 5003.1.1(3) shall be in accordance with Sections 5001, 5003 and 5004, and this chapter.
The use of flammable gases in amounts exceeding the maximum allowable quantity per control area indicated in Section 5003.1.1 or 5003.1.1(3) shall be in accordance with Sections 5001, 5003 and 5005, and this chapter.
The storage and use of flammable cryogenic fluids shall be in accordance with Sections 5806.2 through 5806.4.8.3 and Chapter 55.
Storage of flammable cryogenic fluids in stationary containers outside of buildings may be subject to local ordinances or other regulations.
Above-ground tanks for the storage of liquid hydrogen shall be maintained in accordance with the applicable building code.
Underground tanks for the storage of liquid hydrogen shall be maintained in accordance with the applicable building code.
Anchorage provided for tanks and systems shall be maintained in accordance with the applicable building code.
The storage and use of metal hydride storage systems shall be in accordance with Sections 5801, 5803, 5804, 5805 and 5807. Those portions of the system that are used as a means to store or supply hydrogen shall also comply with Chapters 50 and 53 as applicable.
The hazard classification of the metal hydride storage system, as required by Section 5001.2.2, shall be based on the hydrogen stored without regard to the metal hydride content.
Metal hydride storage systems shall be listed or approved for the application and designed in a manner that prevents the addition or removal of the metal hydride by other than the original equipment manufacturer.
Compressed gas containers, cylinders and tanks shall be designed and constructed in accordance with Section 5303.2.
Metal hydride storage system cylinders, containers or tanks shall be inspected, tested and requalified for service at not less than 5-year intervals.
Marking and labeling of cylinders, containers, tanks and systems shall be in accordance with Section 5303.4 and Sections 5807.1.5.1 through 5807.1.5.4.

Metal hydride storage systems shall be marked with all of the following:

  1. Manufacturer's name.
  2. Service life indicating the last date the system can be used.
  3. A unique code or serial number specific to the unit.
  4. System name or product code that identifies the system by the type of chemistry used in the system.
  5. Emergency contact name, telephone number or other contact information.
  6. Limitations on refilling of containers to include rated charging pressure and capacity.

Metal hydride storage system valves shall be marked with all of the following:

  1. Manufacturer's name.
  2. Service life indicating the last date the valve can be used.
  3. Metal hydride service in which the valve can be used, or a product code that is traceable to this information.

Metal hydride storage system pressure relief devices shall be marked with all of the following:

  1. Manufacturer's name.
  2. Metal hydride service in which the device can be used, or a product code that is traceable to this information.
  3. Activation parameters to include temperature, pressure or both.
The required markings for pressure relief devices that are integral components of valves used on cylinders, containers and tanks shall be allowed to be placed on the valve.

Cylinders, containers and tanks used in metal hydride storage systems shall be marked with all of the following:

  1. Manufacturer's name.
  2. Design specification to which the vessel was manufactured.
  3. Authorized body approving the design and initial inspection and test of the vessel.
  4. Manufacturer's original test date.
  5. Unique serial number for the vessel.
  6. Service life identifying the last date the vessel can be used.
  7. System name or product code that identifies the system by the type of chemistry used in the system.
Metal hydride storage systems, whether full or partially full, shall not be exposed to artificially created high temperatures exceeding 125°F (52°C) or subambient (low) temperatures unless designed for use under the exposed conditions.
Metal hydride storage systems shall not be placed in areas where they are capable of being damaged by falling objects.
Piping, including tubing, valves, fittings and pressure regulators, serving metal hydride storage systems, shall be maintained gas tight to prevent leakage.
Leaking systems shall be removed from service.
The refilling of listed or approved metal hydride storage systems shall be in accordance with the listing requirements and manufacturer's instructions.
The purity of hydrogen used for the purpose of refilling containers shall be in accordance with the listing and the manufacturer's instructions.
Electrical components for metal hydride storage systems shall be maintained in accordance with Chapter 6 and NFPA 70.
Portable containers or systems shall comply with Sections 5807.2.1 through 5807.2.2.
Containers, cylinders and tanks shall be secured in accordance with Section 5303.5.3.
Where a metal hydride storage system is used on mobile equipment, the equipment shall be designed to restrain containers, cylinders or tanks from dislodgement, slipping or rotating when the equipment is in motion.
Metal hydride storage systems used on motorized equipment, shall be installed in a manner that protects valves, pressure regulators, fittings and controls against accidental impact.
Metal hydride storage systems, including cylinders, containers, tanks and fittings, shall not extend beyond the platform of the mobile equipment.
Valves on containers, cylinders and tanks shall remain closed except when containers are connected to closed systems and ready for use.
Where required by the applicable building code, hydrogen fuel gas rooms shall be maintained.
Unless otherwise permitted by the applicable building code, hydrogen fuel gas operations shall not be located below grade.
Unless otherwise approved by the applicable building code, hydrogen fuel gas rooms shall maintain a negative pressure in relation to surrounding rooms and spaces. Windows shall remain in accordance with the applicable building code and shall not be able to be opened.
Ventilation required for hydrogen fuel gas rooms shall be maintained and operated in accordance with the applicable building code.
Gas detection systems required for hydrogen fuel gas rooms shall be maintained and operated in accordance with the applicable building code.

Where provided, activation of the gas detection system shall occur as designed and approved under the applicable building code. At no time shall the level of flammable gas exceed 25 percent lower flammable limit (LFL) and the system shall be maintained to result in both of the following:

  1. Initiation of distinct audible and visual alarm signals both inside and outside of the hydrogen fuel gas room.
  2. Activation of the mechanical exhaust ventilation system.
Unless otherwise required by the applicable building code failure of the gas detection system shall result in the activation of the mechanical exhaust ventilation system, cessation of the hydrogen generation and the sounding of a trouble signal in an approved location.
Explosion control required for hydrogen fuel gas rooms shall be maintained in accordance with the applicable building code and Chapter 9.
Standby power provided for mechanical ventilation and gas detection systems shall be maintained in accordance with Chapter 12 and remain in accordance with the applicable building code.
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