I sometime use AFT phantom software to do both sprinkler and other hydraulic system calculation - it may not be a typical fire water spray calculation software, it has reducer model built in, that is why i have above thoughts .
Thanks for the further clarification.
I got it: for pipe sizes change in the main using such like a reducing grooved coupling, a node is made, but not necessarily to calculate the friction loss of this node.
With your extra explanation, it is well understood!
Thanks!
Thanks for your responses , which shed light on it.
i am working in gas& oil, petro -chemical field, i have seen huge containment pond or sump designed to handle entire fire water plus hazard liquid.
Everybody wants to cut cost ,and IFC is a code , following it should be no problem for it to...
Thanks for your explanation.
i have not seen software like Elite fire has a equivalent length for reducer, not sure if to put in added equivalent length to the pipe. the NFPA 13 has mentioned the sprinkler nozzle directly screwed fittings to tees or elbows, reducer, but it says nothing about...
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...
Thanks, Travismack!
You are right, pressure regulating deluge valves can make adjustment individually. These are very specific situations where it is used with pressures <175 psi.
if someone uses ONE pressure -reduced valve before 7 deluge valves to lower pressure( just to avoid too much...
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...
Thanks DBronson!
From the context, IFC 905.3.1 should apply only to buildings, not structue. The chemical processing units are mostly open ,multi-story steel platform structure .
Seems that IBC and IFC do not require a standpipe for such open structure ,except open garage . NFPA 1 is phrasing...
Thanks for Cdafd's reply!
The term for building in NFPA seems including all structures. It really puzzle me, does that mean IBC will apply to open chemicals processing structures ? not sure the IFC 905.3.1 applies to all structures.
Open structures are exempt from NFPA 101 and NFPA 5000...
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...
Your answers are very helpfull , Thanks to MGXFP and CDAFD !
I am rest assured that the no additional waterflow is needed for each floor control assembly (if any) of preaction system,except the pressure switch on the preaction valve to monitor the air pressure .
