1. Compressed gases used as refrigerants in refrigerating systems in accordance with FC Chapter 6.
2. Compressed natural gas (CNG) stored and used on a motor vehicle for motive power in accordance with FC Chapter 22, NFPA 52 and the Fuel Gas Code.
3. Compressed gases connected for use in a fire extinguishing system.
COMPRESSED GAS. A material, or mixture of materials, that is a gas at 68°F (20°C) or less at 14.7 psia (101 kPa) of pressure; and has a boiling point of 68°F (20°C) or less at 14.7 psia (101 kPa) that is either liquefied, nonliquefied or in solution at that temperature and pressure, except that gases which have no other health- or physical-hazard properties are not considered to be compressed until the pressure in the packaging exceeds 41 psia (28 kPa) at 68°F (20°C). Compressed gases shall be classified as follows:
Nonliquefied compressed gases. Gases, other than those in solution, that are in a packaging under the charged pressure and are entirely gaseous at a temperature of 68°F (20°C).
Liquefied compressed gases. Gases that, in a packaging under the charged pressure, are partially liquid at a temperature of 68°F (20°C).
Compressed gases in solution. Nonliquefied gases that are dissolved in a solvent.
Compressed gas mixtures. A mixture of two or more compressed gases contained in a single packaging, the hazard properties of which are represented by the properties of the mixture as a whole.
COMPRESSED GAS CONTAINER. A pressure container designed to hold compressed gases at pressures greater than one atmosphere at 68°F (20°C).
COMPRESSED GAS SYSTEM. An assembly of components, such as containers, reactors, pumps, compressors and connecting piping and tubing, designed to contain, distribute or transport compressed gases.
NESTING. A method of securing flat-bottomed compressed gas containers upright in a tight mass using a contiguous three-point contact system whereby all containers within a group have a minimum of three points of contact with other containers, walls or bracing.
TUBE TRAILER. A tractor trailer upon which a number of tubular gas containers have been installed, typically with a manifold connecting the container valves, that is used to deliver and dispense a compressed gas.
Exception: DOTn specification containers having an internal volume of 30 SCF (0.855 m3) or less.
1. Piping that is designed or intended to carry more than one compressed gas at various times shall have appropriate signs or markings posted at the manifold, along the piping and at each point of use to provide clear identification and warning.
2. Piping within gas-manufacturing plants, gas-processing plants and similar occupancies shall be marked in an approved manner.
1. Securing containers to a fixed object with one or more noncombustible restraints. Containers shall not be secured to plumbing systems or electrical conduits.
2. Securing containers on a cart or other mobile device designed for the movement of compressed gas containers.
3. Nesting of compressed gas containers at container filling or servicing facilities or in seller's warehouses not accessible to the public. Nesting may be used provided the nested containers, if dislodged, do not obstruct any required means of egress.
4. Securing of compressed gas containers to or within a rack, framework, cabinet or similar assembly designed for such use, except when the containers are being inspected, serviced, filled or transported.
5. Securing stationary compressed gas containers to a foundation designed for such use in accordance with the construction codes, including the Building Code.
Exception: Compressed gas containers with an internal volume less than 0.174 ft3 (0.005 m3) may be stored in a horizontal position.
Exception: Compressed gas containers with an internal volume less than 0.174 ft3 (0.005 m3) may be used in a horizontal position.
1. The average velocity of ventilation at the face of access ports or windows shall not be less than 200 feet per minute (61 m/s) with a minimum of 150 feet per minute (46 m/s) at any point of the access port or window.
2. Connected to an exhaust system.
3. Internally protected by a sprinkler system.
1. Each sterilizer shall be equipped with an independent, dedicated and gas-tight vent line for the discharge of gases containing ethylene oxide.
2. Vent lines shall discharge directly outdoors or to an emission control system. Such vent lines shall not discharge into any other ventilation or exhaust system.
3. The piping and the point of discharge for all vent lines discharging outdoors shall be designed and installed to prevent moisture from entering the vent line.
4. Vent lines, including piping, fittings and other components, shall be in accordance with the specifications of the sterilizer manufacturer. Pipe lengths shall not exceed the maximum lengths specified by the manufacturer. Vertical travel distances, elbows, sharp bends and any reduction in vent line size shall be kept to a minimum.
1. Sterilization systems shall be operated and maintained in compliance with the manufacturer's specifications and the approved testing laboratory listing requirements.
2. Air compressors and their air intakes shall be located such that any gas that may leak from the sterilization system or stored containers will not enter the compressor.
3. Sterilizers shall not be operated if the room ventilation system, local area ventilation system or vent pipe is not operational.