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  1. pipesnpumps

    Clearance from deflector to bookshelves

    All, I have an issue with tall bookshelves coupled with a low ceiling. Is there any way to arrange the bookshelves and sprinklers such that 18" clearance from deflector to top of the shelf is not required? Everything I read in NFPA 13 says no, but I thought I'd ask anyway.. The only thing I...
  2. pipesnpumps

    Combined System Riser - supply more than one?

    "7.1.3 Auxiliary Systems. A wet pipe system shall be permitted to supply an auxiliary dry pipe, preaction, or deluge system, provided the water supply is adequate." With "AN" being the key word, how have you guys seen this interpreted? Does that mean only one is allowed, or could you supply...
  3. pipesnpumps

    Calculation procedures - Light Hazard adjacent to Ordinary Group 1

    Example: A system where the design shall use the area/density method of the occupancy hazard fire control approach, and must be designed for 3,000 sq ft of area. A mechanical room designed for OH-1 is 1,000 sq ft. The remainder of the building, is Light Hazard. The building is larger than...
  4. pipesnpumps

    quick question - above ceiling and below ceiling

    I am pressed for time today. Where is the language in NFPA 13 about calculations for above and below ceilings. If a contractor calc'd the head below the ceiling and didn't show the one above it flowing, that doesn't seem right to my recollection, but I can't put my finger on the right...
  5. pipesnpumps

    Estimating "rules of thumb" for FP systems

    If you use any rules of thumb in order to roughly guesstimate the material, labor, or total cost of a system or component, please post it here, along with a brief description. Any real examples with actual prices and descriptions would also be helpful. I'm asking only to get a feel for...
  6. pipesnpumps

    Air Aspirating Smoke Detection

    I need to quickly come up to speed on where and how this technology can be applied, lessons learned, things to look out for, etc. Specifically, are there any instances where aspirating smoke detection would not be equivalent to or better than photoelectric detectors? They are being proposed...
  7. pipesnpumps

    combustible roof deck - intumescent paint

    Reviewing plans where sprinklers were omitted from an attic space. Metal truss with exposed OSB roof deck (topped with standing seam metal roof). They called for the exposed side of roof deck to be painted with intumescent paint. However, unless I am mistaken the following says that doesn't...
  8. pipesnpumps

    CFPE test

    Has anyone here studied for and passed NFPA's CFPE (certified fire plans examiner) test? I would like to have this credential since that is what I do, so I was wondering what subjects I should focus on. I ordered the IFMA manual recommended by NFPA for studying, and it is REAL basic. Is the...
  9. pipesnpumps

    design areas

    I am often baffled by the simplest jokes because I read too much into it. This may also be the case with something related to design areas. I have a contractor who is required to design to 1,800 ft2 design area. He chose two design areas on the same floor. An 1,800 ft2 light hazard area. In...
  10. pipesnpumps

    spacing reduction for cross zoned detectors on preact sprinkler sys?

    The subject line says it all. Is there any spacing reduction for fire/smoke detectors which are serving a preaction sprinkler with cross-zoned detectors? i.e. two detectors are required to open the preaction valve. Logic and reason is telling me the detectors should probably be spaced closer...
  11. pipesnpumps

    NFPA 13 TIA 10-01 = Antifreeze ban in dwelling units

    For anyone using NFPA 13-2010 (government work), this is hot off the press; anitfreeze continues to get a bad rap around cooking fires: NFPA 13, 2010 version, TIA 10-01, effective date 8/25/10 1. Add a new section 7.6.1 as follows: 7.6.1 Dwelling Units. Antifreeze shall not be permitted to be...
  12. pipesnpumps

    make-up air for boilers with variable speed FD fans

    also cross posted to HVAC/R forum: What types of approaches have others used to supply make-up air for boilers which have variable speed FD fans? The boilers will have wide turn-down capability, with O2 trim, which means the forced draft (FD) fan is variable speed. The code requires that a...
  13. pipesnpumps

    Make-up air unit for boiler with variable speed FD fan

    What types of approaches have others used to supply make-up air for boilers which have variable speed FD fans? The boilers will have wide turn-down capability, with O2 trim, which means the forced draft (FD) fan is variable speed. The code requires that a fixed rate of make-up air be...
  14. pipesnpumps

    question for the FPEs

    I am mulling over the situation where an FPE designs a project that is bid out and built without the same FPE involved in construction support. The dilemna is the designer of record is no longer involved, it is in the contractors hands. However, a FPE is needed to sign off on the prelim and...
  15. pipesnpumps

    simplest permanent means to allow a BFP forward flow test

    I am seeking input from you guys on the simplest setup that allows for permanent testing for a backflow preventor at full system demand flow.. while the flow is measured. The components for attaching to the system and flow testing should be available to standard fire service personnel...
  16. pipesnpumps

    Storage occupancy: separation from other occupancies, and S-1 vs S-2

    There is something I don't understand with the IBC 2006, Table 508.3.3. This is kind of related to NFPA codes, so not out of line to post here.. An example: A sprinklered building that is an IBC business occupancy (B) has a storage area that is >3,000 sq ft, and it is chosen to have the...
  17. pipesnpumps

    hydrant flow tests and their use in the hydraulic calcs

    Taking a survey here.. I am curious what the NICET or FPE folks think is a completely correct design submittal, as it relates to a proper NFPA 291 hydrant flow test and the use of that flow test data in the NFPA 13 hydraulic calcs.. I know what I think, but what do you think? For example, do...
  18. pipesnpumps

    maximum number of system risers on a multiple riser header

    I can't seem to remember where I read this in the code, but how many systems risers can you have on a single building lead-in? Maybe I just dreamed it one night, but I've got it stuck in my craw that the answer if five.. Can anyone help point me to the right section, or straighten me out...
  19. pipesnpumps

    hose stream for combined system (standpipe)

    What are the requirements for design flow for a combined system standpipe? Let's say I am designing for NFPA 13 Ordinary 2, I read that the inside hose would be 100 gpm and outside would be 150 gpm (total 250 gpm inside/outside).. But the purpose of a 100 gpm hose (1-1/2") would be for...
  20. pipesnpumps

    combining equipment cooling water and condenser water

    I am contemplating combining cooling tower water from an open crossflow cooling tower for two uses: 1) condenser water for a 1,000 ton centrifugal chiller, and 2) cooling water for various utility and process equipment, for which the main load is air compressors. Will there be any problems...

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