I have seen plenty of systems, that have leaks, increase pressure, because of temperature increase. I see gauges that stick (tap it, and it now reads different) I once installed a system with hundreds of 4'-0" sprig-ups, and it took my pump about a 45 minutes to pump up (you could have let out 2...
I agree with CDAFD. Does project have backflow preventer? Can you install a pressure regulator, and recalc. Was original system installed with extra heavy pattern piping, and heads? I would worry about the listing of materials. Most are 175 PSI max working pressure. Maybe you could talk to...
From my experience, the recalled sprinklers were glass bulb, and the bulb sat flush to the seat, and the seat sat flush to the bottom of orifice. I would check to see if the model in question was part of the recall. I have also seen some copper systems that had so much flux present, that maybe...
I would say, about 50% of the systems in AZ, that have Hyd. calc. placards, have the address of the building, and the total no. of sprinklers, in the building, written in on the No. of sprinklers area. LOL! Good question. Silly questions are always the best ones!
I think NFPA is referring to threaded branch outlets, and not to copper or cpvc type systems. I would think that copper and plastic would be more flexible than threaded steel. Maybe someone with more knowledge than me can chime in. I know that small threads are more apt to break than soldered or...
Just got a service call on a building with 3" Cpvc mains with steel sprig-ups. You would not believe the amount of time it took us to track down all of the 3"fittings, and pipe, to make the repair. 7- days for shipping etc. I think parts came from 3- states. Something to think about, when...
Most jurisdictions will not require sprinklers in noncombustible spaces, but I have had several instances, where we were made to keep protection, because AHJ was worried about the low voltage wiring above ceiling, catching fire. I also had a situation where the block walls were insulated with...
We have been using them, and are pleased with them. Yes, and the min is 9'-0" between heads. We like them for sloped ceilings,as they only require only 13 GPM @ 7 PSI with up to an 8/12 roof pitch, with a 16x16 head spacing "Great for a concealed sprinkler"
Thanks, CDAFD. You don't know how many times we have had inspectors require the heads be within 5'-o" from the wall. It seems NFPAs explanatory material didn't quite hit the mark, on this code.
Per 8.6.4.1.4.3, In your opinions, what is the reason that sprinklers cant be installed any closer than 5'-0" from the intersection of upper and lower truss chords? I don't understand NFPA's explanation in their systems handbook. They say that if a fire starts on the eave they will have a head...
I wonder how much water on average is used in a unsprinklered building to put out a fire.
I worked at a hospital where it was cheaper for the sprinkler contractor to wet tap the fire main to add 1 sprinkler than to pay the city fee to shut down and drain the system.
Sorry for not being more clear, My original question was referring to the minimum distance a sprinkler can be placed next to a ceiling heat diffuser.
I know that most tyco residential heads have to be at least 2 ft. from vertical AC diffusers and 3 ft. from the front and 2ft. from the side of...
We install concealed sprinklers 4" min. from the edge of the coverplate to the wall, as the solder for the coverplate is at the edge of the cover, not the center of head. I don't know if this is code, but I think it should be.
Remember also that you can delete alternating trapeze hangers on cross mains as long as you hang these branch lines at first available joist "excluding side feed systems".Also I think you are required to have a hanger between each branch line, and this should determine your hanger spacing, not...
How about a scenario like in a new wooden shell building with bushed uprights, when the ceilings are put in for the new tenant the upright is removed from the fitting and then reinstalled in the new tee?
I think Scottsdale no longer requires these attic or patio heads, but some surrounding cities adopted similar codes, the problem we had with these codes is that we had trouble with the definition of an "attic" and "patio" Some houses had TJI construction w/ dropped ceilings and soffits below...
What are some of your thoughts on uprights in attics in 13d systems?
Some AHJ's are requiring these heads along with patio heads in some situations like limited fire truck access "hillside lots etc."
I think it is dangerous to ask a sprinkler system to do what it wasn't designed to do as...
Thanks for the input
This is from NFPA 13 2007 edition
9.1.1.6.5* All components of each hanger assembly that attach to a trapeze member shall conform to 9.1.1.4 and be sized to support the suspended sprinkler pipe.
Doesn't this mean that all 3 hanger rods should be sized the same as the...
