Grain Storage S-1 or H-2?

[Jeff Rains]

Doing a code review for a building that has short-term open grain storage, which is conveyed to a truck on a scale and hauled out. I am assuming this will generate grain dust.

Using IBC 2012, 311.2 Moderate-hazard storage, Group S-1, lists "Grain" as one of the applicable uses. However, Section 415.8.1 Combustible dusts, grain processing and storage (and following sections) appears to require that it be classified as H-2.

If that is the case, why even have the S-1 designation? Am I missing something? One thought is that maybe the S-1 is only valid when in containers, but I haven't found that anywhere.

 

[Francis Vineyard]

[F] 307.1 High-hazard Group H. High-hazard Group H occupancy includes, among others, the use of a building or structure, or a portion thereof, that involves the manufacturing, processing, generation or storage of materials that constitute a physical or health hazard in quantities in excess of those allowed in control areas complying with Section 414, based on the maximum allowable quantity limits for control areas set forth in Tables 307.1(1) and 307.1(2).

 

[cda]

Above plus

COMBUSTIBLE DUST. Finely divided solid material that is 420 microns or less in diameter and which, when dispersed in air in the proper proportions, could be ignited by a flame, spark or other source of ignition. Combustible dust will pass through a U.S. No. 40 standard sieve.


A FPE might help in this project and save money overall

 

[mtlogcabin]

The difference is in the definition of "combustible dust"


[F] COMBUSTIBLE DUST. Finely divided solid material that is 420 microns or less in diameter and which, when dispersed in air in the proper proportions, could be ignited by a flame, spark or other source of ignition. Combustible dust will pass through a U.S. No. 40 standard sieve.

 

[mark handler]

Grain Storage S-2 or U, when associated with a residence
Specifically listed in both S2, grains. U grain silos.

 

[Jeff Rains]

Thanks, everyone. That helps.