In IFC , it states fire water runoff of 20 minutes will be collected along with other hazard liquid, if needed, while NFPA 30 is not in line with IFC at this point, it does not say 20 minutes .
Why only 20 minutes , not entire fire water design period? It puzzles me, i can not explain it...
Can somebody please shed light on me about friction loss calculation for reducer in sprinkler calculation: NFPA 13 mentions elbow reducer in hydraulic calculation, but miss out on the equivalent length for reducer.It is common to use reducer after a tee in the branches. it is said equivalent...
Hi, I have a pressure reducing valve in sprinkler issue, my issue is when to install them in sprinkler system .
NFPA13 8.16.1.2.1 In portions of systems where all components arenot listed for pressure greater than 175 psi (12 bar) and the potential exists for normal (nonfire condition) water...
Regarding Required Installations for Standpipe,IFC 905.3.1 states Height. Class III standpipe systems shall be
installed throughout BUILDINGS where the floor level of the
highest story is located more than 30 feet....
My question is this 905.3.1 only applies to buildingS , am i right?
A open...
Hi, I have a question with regard to the Fire pump starting time. NFPA20(2016) specify 4.20.1.2 Within 20 seconds after a demand to start, pumps in series shall supply and maintain a stable discharge pressure (±10 percent) throughout the entire range of operation.But it appears only in chapter...
I see the NFPA13 as below
7.2.3.9 Unless installed in a heated enclosure, check valves shall not be used to subdivide the dry pipe systems.
7.2.3.9.1 When check valves are used to subdivide dry pipe systems in accordance with 7.2.3.9, a hole 1⁄8 in. (3 mm) in diameter shall be drilled in the...
I recently run into a project which has a waterflow detector issue in preaction sprinkler system in multiple floors. For wet sprinkler system ,NPFA 13 has floor control assembly ,which has waterflow detector for each floor as in 8.17.4.2* Wet Pipe System . But this is only for wet system. It...
A really confusing question about Fire water pipe support discrenpancy between NFPA 13 AND 15 has been bugging me , if someone can help me out ,it is highly appreciated, i guess , a lot people will benifit too:
NFPA13(2007)
9.2.6.1 Pipe stands shall be sized to support a minimum of
5 times the...
NFPA 1 13.3.2.26 high-rise building (2015 edition)requires all new high-rise building shall be protected throughout by sprinkler without any exceptions,while IBC 2012 903.2.11.3 Building 55 feet or more requires throughout sprinkler only when occupant load exceeding 30 ... , AND with exception...
FPA13/14 specify like o&Y gate valve as indicative valve.i am wondering if butterfly valve with lever handle without switch can be a indicative valve ,work as control valve when lock open in water sypply to standpipe or spinkler system?this type is much cheaper. Could please someone help to...
