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  1. GlorifiedPlumber1984

    6" schedule 10 pipe in Wood Assemblies

    The AHJ is pretty by the book, and 2016e of NFPA 13, 9.1.5.7.1 looks like larger than 4" is not permitted. The biggest problem is the truss's are made with 2 x 4, so not a lot to work with.
  2. GlorifiedPlumber1984

    6" schedule 10 pipe in Wood Assemblies

    Does anyone have any tips on hanging pipe larger than 4" from a wood truss? Sammy (coach screw rods) are only allowed for 4" and under, and this is new for us. I was thinking about using trapeze assemblies, with 2 1/2" pipe as the modulus. I'm not sure if doing that would allow each point of the...
  3. GlorifiedPlumber1984

    Horizantal Standpipe Hose Valves

    That makes sense, thank you. The wording for me at least was a little confusing, and when I was trying to think about the why behind using the code line item on one side but not the other I was coming up blank but a stairwell being inaccessible, causing the need for at least 1 hose connection at...
  4. GlorifiedPlumber1984

    Horizantal Standpipe Hose Valves

    Question for anyone with better knowledge on this. Per NFPA 14, 2016e, 7.3.2.2.1 and the associated diagram in the annex describe the ability to eliminate a hose valve on the "other" side of a horizontal exit if all areas are reachable by a hose connection in an exit stairway. If, on both sides...
  5. GlorifiedPlumber1984

    Attic Eaves and Hips

    We are not, just standard uprights.
  6. GlorifiedPlumber1984

    Attic Eaves and Hips

    Question on attic layouts, superficially hips. In an effort to design a better attic we've started looking into placing heads directly under the hips. The picture attached is a quick sketch on top of 8.6.4.1.4.3 on 2016e NFPA 13. If we are trying to stay under 8' against the slope between heads...
  7. GlorifiedPlumber1984

    Fire pump motor listing

    We are using the 2013e of codes, however I checked the latest 2022e and the verbiage is the same. 9.5.1.1 specifies the motor shall be listed for fire protection use and conform with NEMA standards. 9.5.1.2 states that single phase, along with a few other scenario's, don't have to adhere to...
  8. GlorifiedPlumber1984

    Fire pump motor listing

    Can anyone advise on single phase motor listings? We purchased a packaged fire pump system for a 13R town-home, and the reviewer is stating that the motor has to be listed. After getting with the manufacturer, it doesn't appear that the motor is listed, but this package is advertised as fully...
  9. GlorifiedPlumber1984

    Attic Truss Hanger Question

    Hey,hoping I can get an answer and hopefully some code references in regards to hanging sprinkler pipe in a wood truss attic. If pre-engineered truss's are used, is there a requirement that the sprinkler pipe has to be hung from the top chords?
  10. GlorifiedPlumber1984

    Multi Story Wet and Dry systems

    Any advice or consensus on the best/most efficient way to run a system that has wet and dry sprinklers on multiple levels? If the levels combined are less than the total area (52,000 sqft for example for a light hazard system), would it be possible to have a single dry pipe valve with zone...
  11. GlorifiedPlumber1984

    Fire Flow

    Thanks for the responses. I'm sure I'm looking at this the wrong way.....but a fire pump inside the building wouldn't solve fire flow right? Fire flow is the water available for firefighting operations at the hydrant connections serving a building? A fire pump serving the fire sprinkler system...
  12. GlorifiedPlumber1984

    Fire Flow

    Wondering if anyone can help with fire flow info? We have an existing building with a sprinkler system that is getting a big renovation/tenant change. A flow test was ordered, and the numbers are not great. What is the solution IF the numbers appear to meet the fire sprinkler demand but not the...
  13. GlorifiedPlumber1984

    Flow test's from multiple hydrants?

    Can someone more versed in converting flow tests results walk me through how to interpret some results we received from a water authority? Specifically, we typically get the static and residual pressure from Hydrant1, get the pitot pressure and coefficient from Hydrant 2, and then use 29.83...
  14. GlorifiedPlumber1984

    Interstitial Head question

    Thank you! Extremely helpful as I hadn't even thought to check NFPA 25 and I was getting bogged down in the state building code looking for something that would confirm or deny, this will help us a lot. Again, thanks!
  15. GlorifiedPlumber1984

    Interstitial Head question

    We are doing a large project that is going to end up having close to 800 interstitial heads on a variety of floors. The floors are open web members that will have dry wall (gypsum board) attached directly to the bottom of the joist. A building inspector has questioned how and where the access...
  16. GlorifiedPlumber1984

    Fire alarm vs sprinkler for open ended corridors

    Thanks for the feedback, no the builder's property insurance isn't a factor in this job. I do see where the IBC takes precedence over NFPA 13R, I guess my question is the interpretation of the line item itself out of IBC. 1027.6 exception 3.1 "The building, including open-ended corridors...
  17. GlorifiedPlumber1984

    Fire alarm vs sprinkler for open ended corridors

    https://res.cloudinary.com/engineering-com/image/upload/v1554739147/tips/example_jgofcw.pdf
  18. GlorifiedPlumber1984

    Fire alarm vs sprinkler for open ended corridors

    All, we have an AHJ that is interpreting the following scenario and i would like some feedback on everyone's thoughts and opinions. We have a 3 story wood framed R-2 apartment buildings, that has an open ended corridor that runs down the center. We didn't provide sprinkler coverage based on NFPA...
  19. GlorifiedPlumber1984

    compartments and calculated heads

    Thanks all. I probably didn't describe it perfectly, but there is no compartment on floors 3 and 4 that have 4 heads. This is a standard townhouse with a roughly 25 x 15 footprint, and the top two floors are broken up into bedrooms, closets, bathrooms and small hallways. The second floor has a...
  20. GlorifiedPlumber1984

    compartments and calculated heads

    HELP! We have been designing and installing 13D and 13R in a variety of townhouse applications, and recently we had a plan reviewer start questioning or most remote/demanding heads. Specifically, its a 4 story townhouse that we received a variance to run it as 13d "modified". All the bells and...

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