N.Y.C. Admin. Code § FC 6005: Section FC 6005: Ozone Gas Generators

6005.1 Scope.

This section shall govern the design, installation, operation and maintenance of ozone gas generators with a maximum ozone-generating capacity of 1/2 pound (0.23 kg) or more over a 24-hour period.

Exceptions:

1. Ozone-generating equipment used in Group R-3 occupancies.

2. Ozone-generating equipment used in Group H-5 occupancies in compliance with FC Chapters 27 and 50 and the provisions of FC Chapter 60 governing highly toxic gases.

6005.2 Design.

Ozone gas generators shall be designed, manufactured and tested in accordance with NEMA 250.

6005.3 Location.

Ozone gas generators shall be located in approved cabinets or ozone generator rooms in accordance with FC 6005.3.1 or 6005.3.2.

6005.3.1 Cabinets.

Ozone cabinets shall be constructed of approved materials and compatible with ozone. Cabinets shall display an approved sign that reads: OZONE GAS GENERATOR – HIGHLY TOXIC – OXIDIZER.

6005.3.1.1 Seismic design.

Cabinets shall be braced for seismic activity in accordance with the Building Code.

6005.3.1.2 Ventilation.

Cabinets shall be mechanically ventilated in accordance with the Mechanical Code.

6005.3.2 Ozone gas generator rooms.

Ozone gas-generator rooms shall be mechanically ventilated in accordance with the Mechanical Code. Ozone gas generator rooms shall be equipped with a continuous gas detection system which will shut off the generator and sound a local audible and visible alarm when concentrations above the permissible exposure limit occur.

6005.3.2.1 Signage.

Ozone gas-generator rooms shall not be normally occupied, and such rooms shall be kept free of combustible and hazardous material storage. An approved sign that reads, "OZONE GAS GENERATOR – HIGHLY TOXIC – OXIDIZER", shall be posted on or near each entrance door to an ozone gas-generator room.

6005.4 Piping, valves and fittings.

Piping, valves, fittings and related components used to convey ozone shall be in accordance with FC 6005.4.1 through 6005.4.3.

6005.4.1 Piping.

Only welded stainless steel piping or tubing shall be used.

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 Signage or marking.

Piping shall be marked, or identified by a durable sign posted on or near the piping that reads, as follows: "OZONE GAS – HIGHLY TOXIC – OXIDIZER".

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. When the gas detection system detects ozone.

4. Failure of the ventilation system for the cabinet or ozone-generator room.

5. Failure of the gas-detection system.

6005.6 Manual shutdown.

Manual shutdown controls shall be provided at the ozone gas generator and, when the generator is in a room, within 10 feet (3048 mm) of the main exit or exit access door.