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  1. acb324

    Engine test cells other than aircraft

    Well this thing resurfaced yesterday. One of the consultants was suggesting the need for an Inergen system or something akin to that because they had seen it in many previous installations. I explained that it was not code required (including confirmation from the AHJ), but rather an add on...
  2. acb324

    How often does an air compressor typically run?

    Thank you for the great suggestion Stookey. I was thinking it was running too frequently and it was an abnormal amount of leakage. I will forward the idea on. I don't have a good feel for how often a compressor runs on an old dry system. I am a design engineer so I only see them right after...
  3. acb324

    How often does an air compressor typically run?

    How often does an air compressor typically run on a dry system? I understand that over time the system leaks more and it will run more frequently, but at what frequency would a red flag go up for you? I am having reports from a building engineer that the compressor on his dry system is running...
  4. acb324

    Engine test cells other than aircraft

    No offense taken. I am only providing a basic wet system with a 0.3 gpm density per Chicago code (use of flammable liquids dictates so), I just wondered what people do elsewhere in the country. Searches will yield case studies of all types of special hazard systems and the cool stuff they...
  5. acb324

    Engine test cells other than aircraft

    That is always a mess in the city. Chicago code calls for no sprinklers in generator rooms, with no distinguishing diesel out separately. Usually fuel storage room is separate. It almost always becomes an issue because more often than not FM is the insurance carrier and wants a laundry list...
  6. acb324

    Engine test cells other than aircraft

    in the better portion of the space, yes, much like an auto shop. but there is a room that does contain a test cell. it is unclear how long they will run tests for.
  7. acb324

    Engine test cells other than aircraft

    This is at a community college. Its a facility where they train truck drivers and mechanics and the like. I would prefer to have some kind of special hazard protection in place, but I am certain that would quickly be "value engineered" out of the project due to the lack of code requirement for it.
  8. acb324

    Engine test cells other than aircraft

    I'm interested to know everyone's thoughts on the method of protection for an engine test cell that is not for aircraft engines, but rather for car or truck engines, using either gasoline or diesel fuel. At bare minimum I'm inclined to put some local protection as described in NFPA 37 since...
  9. acb324

    Sidewall sprinklers listed for 18" from ceiling

    Thank you so much!
  10. acb324

    Sidewall sprinklers listed for 18" from ceiling

    Per NFPA 13 (2013 and other editions too) - 8.7.4.1.1.2 sidewalls can be placed up to 18" below noncombustible or limited combustible ceilings when listed for such use. Does anyone know of a sprinkler that is listed for 18"? I have only ever seen 12". This would be a lifesaver if the elusive...
  11. acb324

    Combustible Overhang & NFPA 13 (2007)

    I missed the concealed space portion. I was just picturing something akin to a slanted awning but up at the parapet height. Agreed with Sdpaddler, I would definitely go on record recommending sprinklers.
  12. acb324

    Combustible Overhang & NFPA 13 (2007)

    I always err on the side of caution as stookey says, but why wouldnt this fall under 8.15.7 - exterior roofs, canopies, porte-cocheres, balconies, decks or similar projections? I would think since the projection does not exceed 4 feet in width from the building it doesn't require protection.
  13. acb324

    when can a ceiling be considered "open-grid"

    Yeah, I thought about that and was calling for heat collectors on the lower layer of sprinklers. Thank you for you input!
  14. acb324

    when can a ceiling be considered "open-grid"

    Thanks cdafd! tell me - what makes you say it doesn't sound like an open grid? The argument goes like this: NFPA 13 contains specific geometric criteria by which open grids can be placed below sprinklers. Openings must be at least 1/4" wide in the least dimension - openings are ~10" and at...
  15. acb324

    when can a ceiling be considered "open-grid"

    I was unable to find an NFPA definition of open-grid ceiling, do any of you know if this exists? To me a grid implies lines running in both directions. Typically an open-grid ceiling looks something akin to a 2'x2' acoustical tile ceiling before the tile gets put in. I am the engineer...
  16. acb324

    Sprinklers in a Gymnasium

    SMOKE-PROTECTED ASSEMBLY SEATING. Seating served by means of egress that is not subject to smoke accumulation within or under a structure. Seems that there has to be some form of mechanical or natural smoke control. As far as 903.2.1.4 - be careful not to overlook the occupant load. I have...
  17. acb324

    Sprinklers in a Gymnasium

    Ken, I think you need to take a look at the IBC chapter 9, particularly 903.2 Where Required. Sprinklers are required based on occupancy type, occupant load, and fire area, among other requirements. See if that clears anything up for you. It's hard to say much more without more details of...
  18. acb324

    Undercut doors in dormitory

    Just to close the loop here: I called NFPA for technical clarification and the specialist said per 90A this was ok. He confirmed that this approach, while not the norm, is perfectly acceptable. You can transfer air from the sleeping quarters through the undercut door and exhaust it through...
  19. acb324

    Undercut doors in dormitory

    Thanks cdafd. I got concerned looking at the nfpa glossary of terms where the definition of exit passageway was "Hallways, corridors, passages, or tunnels used as exit components and separated from other parts of the building in accordance with NFPA 101®, Life Safety Code®." It seemed to me as...
  20. acb324

    Undercut doors in dormitory

    This is new construction. IBC is not adopted, but NFPA is. My concern is whether or not nfpa speaks to the pressure differential being acceptable.

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