The standard notes and implies in two places, once in 7.1.5.1 and once in the annex that multiple vents on one system are not practical or required, but would certainly help...
It would really be a nightmare if you had to do that.
on the NFPA webpage they say a "task group" came up with this...
The 2016 edition of NFPA 13 now requires an air vent on every wet system:
7.1.5 Air Venting. A single air vent with a connection conforming to 8.16.6 shall be provided on each wet pipe system utilizing metallic pipe. (See A.8.16.6.)
7.1.5.1 Venting from multiple points on each system shall not...
Also note that (3) requires the flow and residual pressure at the BOR in addition to the hose stream+system demand in (5), which means the HYDRAULIC PLACARD MANUFACTURER'S MAKE THE SIGNS INCORRECTLY
not that we fill them out wrong, there aren't enough boxes on many of them.. or correct boxes..
fixed links:
Link
Link
about the definition of exposed, in the context in which it is used, seems like fire treated wood could be considered shielded or protected (from fire), steel could be considered shielded or protected (from fire), but non treated wood could be considered exposed (not...
what version of NFPA 13 is that from? I looked for it in the definitions of the 2013 edition and I couldn't find it
completely agree though that exposed shouldn't have anything to do with combustibility in-of-itself
still perplexing as to why it seems to be associated with combustibility from...
FWIW Matt I read it the same way, sprinklerdesigner2 standing over my shoulder told me it had to do with the combustibility and it seems idiotic not to just call them "combustible members" or "noncombustible members" which isolates them from ceilings, but who knows.
In the space above the "ceiling 7" below the bottom of the glue-lams" and the top of the glue-lams, aren't the glue-lams visible and therefore exposed?
If so, what's an example of a non-exposed (invisible) member?
What does "exposed" mean in the phrase "exposed members"? How would you convince the AHJ that's what it means?
In NFPA 13 2013, Table 8.6.2.2.1(a) has many interesting things going on...
A short snippet from the handbook giving us additional info:
If you look at the table where it says...
OK, this business about "how do you determine which standard to use" was confusing to me as well so I researched it.
It turns out, the IBC, IFC, and what your building official says is all just part of the story.
You need to think about this in terms of a hierarchy. Just because something has a...
I have been looking everywhere for a way to find out how wide the top of a joist is based on structural plans (looking at the steel designation, and then looking it up).
Nothing seems to be standardized across manufacturers so I'm looking for some rules of thumb.
What I think is happening by...
The NFSA EOD gave their informal opinion on this,
"What you are describing here is a private water service since it is supplied from a domestic booster pump and feeds both the domestic and fire lines for the complex. Private water services are outside of the scope of NFPA 13R. The applicable...
That is what SprinklerDesigner2 says as well and he says he's seen it happen as he's done it before.
However, even if the water is turbulent, it may be the case that the pressure at that point is the same no matter the turbulence, and the gauge on the hydrant cap is measuring the pressure...
What I think is going on is that the pitot gauge is measuring the pressure of the water as it accelerates through a known orifice size (the 2.5" hydrant outlet), which gives you the velocity pressure and that subsequently gives you the flow rate. In order to get the actual velocity pressure...
@NewtonFP
Some hydrants have the pumper outlet centerline at the same elevation as the 2.5" outlet centerline, I wonder if this would be okay to use a hydrant-cap-gauge with?
However, even on hydrants with pumper outlets slightly below (or maybe even above) the 2.5" outlets, would this minor...
if that is the case, then could he not treat it like a normal "non fire sprinkler device" as if the booster pump were right below a water tower? then he goes out to one of these hydrants downstream the pump, figures out a clever way to flow really close to whatever his most demanding building...
