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6005.1 Scope
Ozone gas generators having a maximum ozone-generating capacity of 0.5 pound (0.23 kg) or more over a 24-hour period shall be in accordance with Sections 6005.2 through 6005.6.
Exceptions:
  1. Ozone-generating equipment used in Group R-3 occupancies.
  2. Ozone-generating equipment where used in Group H-5 occupancies where in compliance with Chapters 27 and 50 and the other provisions in this chapter for highly toxic gases.
6005.2 Design
Ozone gas generators shall be designed, fabricated and tested in accordance with NEMA 250.
6005.3 Location
Ozone generators shall be located in approved cabinets or ozone generator rooms in accordance with Section 6005.3.1 or 6005.3.2.
Exception: An ozone gas generator within an approved pressure vessel where located outside of buildings.
6005.3.1 Cabinets
Ozone cabinets shall be constructed of approved materials and compatible with ozone. Cabinets shall display an approved sign stating: "OZONE GAS GENERATOR—HIGHLY TOXICOXIDIZER."
Cabinets shall be braced for seismic activity in accordance with the International Building Code.
Cabinets shall be mechanically ventilated in accordance with the International Mechanical Code with not less than six air changes per hour.
The average velocity of ventilation at makeup air openings with cabinet doors closed shall be not less than 200 feet per minute (1.02 m/s).
6005.3.2 Ozone Gas Generator Rooms
Ozone gas generator rooms shall be mechanically ventilated in accordance with the International Mechanical Code with not less than six air changes per hour. Ozone gas generator rooms shall be equipped with a gas detection system complying with Section 916 that will shut off the generator and sound a local alarm when concentrations above the permissible exposure limit (PEL) occur.
Ozone gas generator rooms shall not be normally occupied, and such rooms shall be kept free of combustible and hazardous material storage. Room access doors shall display an approved sign stating: "OZONE GAS GENERATOR—HIGHLY TOXICOXIDIZER."
6005.4 Piping, Valves and Fittings
Piping, valves, fittings and related components used to convey ozone shall be in accordance with Sections 6005.4.1 through 6005.4.3.
6005.4.1 Piping
Piping shall be welded stainless steel piping or tubing.
Exceptions:
  1. Double-walled piping.
  2. Piping, valves, fittings and related components located in exhausted enclosures.
6005.4.2 Materials
Materials shall be compatible with ozone and shall be rated for the design operating pressures.
6005.4.3 Identification
Piping shall be identified with the following: "OZONE GAS—HIGHLY TOXICOXIDIZER."
6005.5 Automatic Shutdown
Ozone gas generators shall be designed to shut down automatically under the following conditions:
  1. When the dissolved ozone concentration in the water being treated is above saturation when measured at the point where the water is exposed to the atmosphere.
  2. When the process using generated ozone is shut down.
  3. Failure of the ventilation system for the cabinet or ozone generator room.
  4. Failure of the gas detection system in an ozone gas generator room.
6005.6 Manual Shutdown
Manual shutdown controls shall be provided at the generator and, where in a room, within 10 feet (3048 mm) of the main exit or exit access door.

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