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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. acb324

    Undercut doors in dormitory

    In a dormitory, can the dorm rooms be under negative pressure relative to the corridor? Does this create a potential issue if a fire started in one of the dorm rooms, as far smoke pouring out into the egress corridor? As far as I can tell, NFPA 101 chapter 28 on dormitories prohibits transoms...
  6. acb324

    Sprinklers in hospital wardrobes per The Center for Medicare and Medicaid Services Policy

    Does anyone know where I can find a copy of CMS Program Letter No. 93-12? It is driving the need for sprinklers in hospital wardrobes despite this not being required by NFPA 13 and it would be great to have the document to reference the actual requirements. I am wary to design to requirements...
  7. acb324

    Sprinklers in Temporary Displays

    I have been asked whether or not a temporary display at a museum will require sprinkler protection under NFPA 13. I was unable to find an exception due to the fact that the display is temporary. It is basically a wood frame tent with tarp material stretched over it (approx 20'x60') that is...
  8. acb324

    free standing FDC drainage with no basement

    I try to avoid at all costs a free standing fire department connection whenever there is no basement in a building due to drainage concerns. I have heard horror stories of the trapped FDC pipe having remaining water from testing or poor drainage, then freezing and leaking or corroding. Despite...
  9. acb324

    sprinklers under overhangs per NFPA 13

    When are sprinklers required under an overhang on a building per NFPA 13? My confusion is caused by the annex in this instance. NFPA 13 (2010) 8.15.7.2 states that sprinklers can be omitted from beneath projections that are non-combustible. Period. Nothing about the occupancy above the...

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