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Forums» Fire Codes» Fire Code 3705.4 - Ozone Gas Generator

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Fire Code 3705.4 - Ozone Gas Generator
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Fire Code 3705.4 - Ozone Gas Generator By  Nicole Persaud

Posts: 1

4/12/2012 3:39:07 PM

I am looking for clarification regarding where the Fire Code states:

"Piping, valves, fittings and related components used to convey ozone shall be in accordance with Sections 3705.4.1 through 3705.4.3.


    3705.4.1 Piping. Piping shall be welded stainless steel piping or tubing.



            1. Double-walled piping.

            2. Piping, valves, fittings and related components located in exhausted enclosures.

I have a 1.5 lb/day ozone generating system operating outdoors for the use of remediating groundwater contamination.  Telfon tubing and fitting are compatible with ozone and is being used as the conveyance material.  However, the local fire department is requirement the valves, fittings, and tubing to be within secondary containment.  Telfon alone should be acceptable. 

Is there any clarification regarding this section of the code for when a the ozone generating system is operating outdoors, i.e. already ventilated?

Thank you,


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Fire Code 3705.4 - Ozone Gas Generator By  Research Safety

Posts: 5

8/13/2012 2:36:04 PM

Standards are intended to provide reasonable safeguards. 

You could calculate how much air would be required to dilute an ozone tube leak to relatively safe levels (0.05ppm -0.2ppm per ACGIH).   This will give you an indication of the relative hazard of an ozone leak event and a relatively safe distance from a leak.  Additionally, the short half life and good physiological warning properties of ozone may be considered in a risk assessement.  Secondary gas piping only makes sense when the interstitial space is monitored for leaks and high exposure risk requires its use.

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