Contractor is proposing using a single head system using IFC 903.3.8 Limited Area Sprinkler Systems to satisfy the sprinkler requirement from IFC 5306.2.2 One-Hour Interior Room.
Oxygen cylinder storage at vet clinic, "120 gal" tanks, total of "1644 cu. ft.". Section 903.3.8 only allows LH or OH1 hazards. It was originally proposed as EH1, revised to OH1 but has not substantiated with code. OH2 comes up in multiple locations (NFPA 13-19 26.11.1.1, NFPA 400 21.2.10.2). Is there a special provision, or some other way OH1 is appropriate here? At this point the only solution appears to be relocating the room to an exterior wall which allows a "single head for cooling", which seems to not require any specific density, or to provide a full building system with OH2 in the oxygen room. Thanks for helping me sort this out. Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
7 Comments
SCHULMAN
5/23/2023 08:34:37 am
Oxygen is flammable, but it is not combustible.
Reply
5/23/2023 11:38:54 am
Oxygen is NOT flammable or combustible, it is an oxidizer only. It cannot burn, but it can increase the rate (and efficiency) of combustion.
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Glenn Berger
5/23/2023 09:32:43 am
Is there only 1 cylinder of O2 in play here? Or are their spare (full) cylinders?
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Danial Bartle
5/23/2023 10:10:14 am
Compressed oxygen is considered an oxidizer and 1500 cuft is the MAQ unless the building is fully sprinkled or where stored or used in approved cabinets, gas cabinets, exhausted enclosures, gas rooms, as appropriate for the material. (NFPA 55-20 6.3.1.1). Gas rooms have requirements as well if they are used to increase the MAQ. Sprinklers and/or Gas rooms increase the MAQ 100% each.
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Danial Bartle
5/23/2023 02:26:56 pm
As an additional note provided from the National Fire Sprinkler Association TechNote that actually came out today:
Reply
Naj
5/23/2023 11:46:00 am
Let the contractor install safety cabinets with the O2 cylinders in them.
Reply
David Toshio Williams
5/23/2023 03:36:51 pm
I just used the NFPA 101, 9.7.2 &9.7.3 limited area system for a LOX maintenance building that had a small (200SF) O2 storage room. I initially was confused about the EH/OH2 criteria in NFPA 13, as it initially pointed me towards 0.3gpm/SF over 2500 SF but it seemed the provision single for 0.15gpm/sf says ANY hazardous area that requires not more than 6 sprinkler heads and to only calculate the room area (200SF).
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