An overhead door manufacturer was cited a violation from the local AHJ stating that the Storage exceeded 12-ft. The building in question has two warehouses protected by the same wet system. One side of the warehouse has an approximately 30-ft high ceiling, and the other side is approximately 20-ft high. The lower side stores doors up to 12-ft in height, on pallets or dunnage in cardboard with strapped packaging. Most of this is straight off the flow without any racking. On small racking unit along the wall with a mixture of cardboard boxes. The higher ceiling has a few cantilever style racks with overhead doors wrapped in either plastic or cardboard while being strapped. It also has a single-row rack with boxes on conventional pallets. The bottom row has plastic pallets. The existing system is currently designed for Ordinary Hazard Group 2. What classification should this storage fall under? Is OH2 appropriate given the heights and contents? Are there further evaluations that would need to be had to arrive at the hazard classification for this? Thanks in advance. Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
11 Comments
Pete H
12/4/2023 06:23:10 am
Assuming there is nothing more combustible than a class 3 commodity in those boxes, it's open shelf racks, and there is no encapsulation then yes: double and multiple row rack storage up to 12'-0" in storage height with no maximum ceiling height are to use the design curve of OH2 on Figure 13.2.1 (NFPA 13 2016 edition) as per Table 13.2.1. This also applies to solid piled, palletized, bin box, and shelf storage, as well as single row racks and back to back shelf storage.
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Anthony
12/4/2023 08:06:33 am
Pete has the code right here but I do see some wrapped pallets at the top. I think that would drive you to encapsulation.
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Justin
12/4/2023 10:56:32 am
Customer wants to have storage covered for up to 15’
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Jack G
12/4/2023 04:36:02 pm
If you have sprinklecad, you may have available to you a program called “ Sprinkcode”. It’s an amazing program for determining head type, densities ( depending on heads).for storage heights whether palletized ,in racks, types of pallets, encapsulated or not, rack types.
Pete H
12/6/2023 10:19:50 am
Then it's not going to be OH2. 15'-0" will be rack storage as governed by either chapter 16 or 17 of NFPA 13 (2016 edition) depending on commodities.
sean
12/31/2023 06:57:32 pm
table 13.2.1 is part of misc. storage that has a sq.ft. and area limitation.
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Jesse
12/4/2023 08:09:51 am
Its not OH2 pers se, but rather low piled storage - which can be protected by an OH2 system.
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Franck
12/4/2023 08:17:37 am
As indicated by Pete, you can use the requirements for miscelaneous storage for storage up to 12 ft based on the tables 13.2.1.
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Eric R
12/4/2023 09:31:43 am
Just to add in my 2 cents, you mention that the bottom row is all plastic pallets. Depending on the pallet type this could increase the commodity class by 1 or 2, which will get you to that class 4 or even plastics classification rather quickly.
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Dave
12/4/2023 10:56:57 am
Watch for large rack shelf areas created by the commodity (rack experts please chime in here):
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Jack G
12/4/2023 03:58:09 pm
Be sure to research the hose allowance to make sure 500 gpm is not required with The scenario above.
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