Compressed gases in storage or use not regulated
by the material-specific provisions of Chapters 6, 54,
55, and 60 through 67, including asphyxiant, irritant and
radioactive gases, shall comply with this section in addition
to other requirements of this chapter.
Areas containing insulated liquid carbon dioxide systems used in beverage dispensing applications shall comply with Section 5307.3. Carbon dioxide enrichment systems shall comply with Section 5307.4. Areas other than those covered by Section 5307.3 or 5307.4 shall comply with Section 5307.2.
Areas containing insulated liquid carbon dioxide systems used in beverage dispensing applications shall comply with Section 5307.3. Carbon dioxide enrichment systems shall comply with Section 5307.4. Areas other than those covered by Section 5307.3 or 5307.4 shall comply with Section 5307.2.
Permits shall be required as set forth in Section 105.6.
A continuous gas detection
system shall be provided in the room or indoor area
in which the carbon dioxide enrichment process is located,
in the room or indoor area in which the container systems
are located, and in areas where the heavier-than-air gas
can congregate. Carbon dioxide sensors shall be provided
within 12 inches (305 mm) of the floor in the area where
the gas is most likely to accumulate or leaks are most
likely to occur. The system shall be designed to detect and
notify at a low-level alarm and high-level alarm.
- The threshold for activation of the low-level alarm shall not exceed a carbon dioxide concentration of 5,000 ppm (9,000 mg/m3) Time Weighted Average (TWA) over 8 hours.
- The threshold for activation of the high-level alarm shall not exceed a carbon dioxide concentration of 30,000 ppm (54,000 mg/m3). When carbon dioxide is detected at the high-level alarm, the system shall activate an audible and visible alarm in an approved location.
The design,
installation and maintenance of carbon dioxide enrichment
systems with more than 100 pounds of carbon dioxide, and
carbon dioxide enrichment systems with any quantity of carbon
dioxide having a remote fill connection, shall comply
with Sections 5307.4.1 through 5307.4.7.
The following information shall
be provided with the application for permit:
- Total aggregate quantity of liquid CO2 in pounds or cubic feet at normal temperature and pressure.
- Location and total volume of the room where the carbon dioxide enrichment operation will be conducted. Identify whether the room is at grade or below grade.
- Location of containers relative to equipment, building openings and means of egress.
- Manufacturer’s specifications and pressure rating, including cut sheets, of all piping and tubing to be used.
- A piping and instrumentation diagram that shows piping support and remote fill connections.
- Details of container venting, including but not limited to vent line size, material and termination location.
- Alarm and detection system and equipment, if applicable.
- Seismic support for containers.
Pressure relief, vent piping, fill indicators,
fill connections, vent terminations, piping system,
and the storage, use, and handling of the carbon dioxide
shall be in accordance with Chapter 53 and NFPA 55.
A gas detection system
shall be provided in the room or indoor area in which the
carbon dioxide enrichment process is located, in the
room or indoor area in which the container systems are
located, and in other areas where carbon dioxide is
expected to accumulate. Carbon dioxide sensors shall be
provided within 12 inches (305 mm) of the floor in the
area where the gas is expected to accumulate or leaks
are most likely to occur. The system shall be designed as
follows:
- Activate a low-level alarm upon detection of a carbon dioxide concentration of 5,000 ppm (9,000 mg/m3).
- Activate a high-level alarm upon detection of a carbon dioxide concentration of 30,000 ppm (54,000 mg/m3).
Activation of the lowlevel
gas detection system alarm shall automatically:
- Stop the flow of carbon dioxide to the piping system.
- Activate the mechanical exhaust ventilation system.
- Activate an audible and visible supervisory alarm signal at an approved location within the building.
- Stop the flow of carbon dioxide to the piping system.
- Activate the mechanical exhaust ventilation system.
- Activate an audible and visible evacuation alarm both inside and outside of the carbon dioxide enrichment area, and the area in which the carbon dioxide containers are located.
Rooms or indoor
areas in which carbon dioxide enrichment is provided
shall be maintained at a negative pressure in relation to
the surrounding areas in the building. A mechanical ventilation
system shall be provided in accordance with the
California Mechanical Code that complies with all of the
following:
- Mechanical ventilation in the room or area shall be at a rate of not less than 1 cubic foot per minute per square foot.
- When activated by the gas detection system, the mechanical ventilation system shall remain on until manually reset.
- The exhaust system intakes shall be taken from points within 12 inches of the floor.
- The ventilation system piping shall terminate outdoors in an approved location.
Hazard identification signs shall be
posted at the entrance to the room and indoor areas where
the carbon dioxide enrichment process is located, and at
the entrance to the room or indoor where the carbon dioxide
containers are located. The sign shall be a minimum 8
inches (200 mm) wide and 6 inches (150 mm) high and
indicate:
CAUTION: CARBON DIOXIDE GAS
Ventilate the area before entering.
A high carbon dioxide (CO2) gas concentration
in this area can cause asphyxiation.
Ventilate the area before entering.
A high carbon dioxide (CO2) gas concentration
in this area can cause asphyxiation.
Carbon dioxide
system containers and piping shall comply with the seismic
design requirements in Chapter 16 of the California
Building Code and shall not exceed the floor loading limitation
of the building.
Carbon dioxide containers
located indoors shall not be refilled unless filled from a
remote connection located outdoors.
Where carbon dioxide storage
tanks, cylinders, piping and equipment are located indoors,
rooms or areas containing carbon dioxide storage tanks, cylinders,
piping and fittings and other areas where a leak of carbon
dioxide can collect shall be provided with either
ventilation in accordance with Section 5307.5.1 or a gas
detection system in accordance with Section 5307.5.2.
Indoor storage and use areas and
storage buildings shall be provided with ventilation in
accordance with the requirements of Section 5004.3.
Where mechanical ventilation is provided, the systems
shall be operational during such time as the building or
space is occupied.
Exception: A gas detection system complying with Section
5307.4.3 shall be permitted in lieu of mechanical
ventilation.
A gas detection system
complying with Section 916 shall be provided to monitor
areas where carbon dioxide can accumulate. The system
shall be designed to initiate a local audible and visible
alarm in the room or area in which the sensor is installed
when the level of carbon dioxide exceeds 5,000 parts per
million (9,000 mg/m).