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...
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...
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...
NFPA 291, Recommended Practice for Fire Flow Testing and Marking of Hydrants (2013) says:
"4.9.1 If a pitot tube is not available for use to measure the
hydrant discharge, a 50 or 60 psi (3.5 or 4.0 bar) gauge tapped
into a hydrant cap can be used.
4.9.2 The hydrant cap with gauge attached is...
Ok I have a pretty unorthodox question here, I'm not considering doing this for any job it's just for the sake of learning.
Fire pump configuration (something along the lines of this):
Ordinarily you would use a pump based on the full system flow demand given that any hose demand is taken...
For CPVC piping, in NFPA 13 2013 which allows cumulative sprinkler hanger distances, I can't find a maximum unsupported length.
"9.2.3.2.5* A single section of pipe shall not require a hanger when the cumulative distance
between hangers on the branch line does not exceed the spacing required by...
Ordinary 1, NFPA 13 or 13R looking for either scenario:
What is the maximum OH1 sq. ft. room you can install CPVC pipe in? I found 400 sq. ft. in NFPA 13 and 13R, but seem to recall reading 800 sq. ft. somewhere. Wondering where this 800 sq. ft. might have come from.
Let's say you have a typical light hazard occupancy which requires quick response sprinklers, and lets say for whatever reason I don't want to use quick response sprinklers, or can't because of other project considerations.
Is it possible to just arbitrarily increase the hazard to ordinary 1...
I'm trying to make sense of the logic of NFPA 13's obstruction rules so that I can follow them,
In NFPA 13 2013 edition it says,
8.6.4.1.1.1 Under unobstructed construction, the distance between the sprinkler deflector and the ceiling shall be a minimum of 1 in. and a maximum of 12 in...
For anyone paying $45 a pop for NFPA 25 to distribute, you may have been wasting money, see below.
What this also means is that we are free to post entire code sections of standards/codes adopted into law (or the entire standard), as we have the right to freely disseminate the law that binds us...
The annex of NFPA 13 2007 defines Open-Grid Ceilings in A.3.7.2 (2): "The term open-grid ceilings as used in this standard refers to ceilings in which the openings are 1 ⁄ 4 in. (6.4 mm) or larger in the least dimension, the thickness of the ceiling material does not exceed the least dimension...
NFPA 13 2010 revised the 2002 edition to allow subdivision of Dry Pipe Systems (which is relevant for us for the purpose of remaining below 750 gallon capacity to avoid trip test time concerns).
The standard (2010&2013) states:
7.2.3.9 Unless installed in a heated enclosure, check valves shall...
NFPA 13 says to use 1.2 * sqrt(min remote area) to find the L dimension of the remote area rectangle. I need to know if this means we just ignore walls and assume the fire teleports through them, or if we use them as barriers and can then make square or "tall rectangle" remote areas, see the pdf...
I'm looking for something to help me learn what the names are for unlabeled HVAC symbols I see in 2D cad drawings. Some of it is easy to pick up on like diffusers, different types of ducts, roof units, etc, but I can't figure out things like what the large rectangular crosshatch symbol is...
In NFPA 13 2010, there are 17 instances of sprinkler "heads". All of these instances are in Chapter 21 "Special Occupancy Requirements".
It appears that calling sprinklers by the name of sprinkler "heads" has been wiped out in the official part of NFPA 13 in every chapter except Chapter 21, and...
Two questions:
1. Can you have two different sets of ordinary group II (130 sq ft max coverage) coverage styles in the same room?
2. Can sprinklers be more than 15 ft apart if the lines of intersection of their coverage is less than or equal to 15 ft apart in the direction of their 15 ft...
Is a sprinkler technician, on any level (II, III, IV), allowed to make the 'engineering decision' of determining if a certain water supply is adequate? It appears this is supposed to be the PE or other design professionals job for the preliminary plans - but if he says the city water supply is...
