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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...

Many Thanks to UFT12. I can see that 7.2.3.9 says check valve can subdivide dry system,such sub system can apply to 7.2.3 in NFPA 13.

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 .

I can do thing like floor assembly in NFPA 13 8.17.4.2 using pressure type water flow detector in each branch to each floor area in such preaction system, but i am not sure it can work.

Thanks a lot to UFT12 and cdafd! I have 3 areas located in 3 floors installed with one preaction valve (riser), which already has a pressure switchs on water pipe of preaction valve( located on the header, to monitor the air leaking). My question is : Is it possible to have water flow detector...

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...

Thanks! It is very common in chemical /oil industrial field the tanks /vessels are protected with water spray. Just to save manhour, projects often use standard suport drawings,instead of dedicated calculation,suport design etc. Maybe similar to building, tank wall only needs to handle weight...

Appreciated for your reply! Seems that 6.3.2.7 of NFPA 15 is refering the support design to NFPA 13 besides hangers, which means not only hanger needs to follow NFPA 13, all other supports such as pipe stand nees to follow NFPA 13 too. Since the water spay piping more often is attached to tank...

Thanks for participating anyway, my questions are further clarified like: 1. For water spay pipe support per as NFPA15, 5 times the weight of the water-filled pipe, plus 250 lb (114 kg) is not required, is this understanding correct? 2. If question 1 confirmed, say there is a case where there...

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...

Thanks for your replies.you are right ,the whole book must be carefully red,even explanatory material. IBC has Factory occupancy at chapter3-OCCUPANCY CLASSIFICATION but no industrial one.only mentions special industrial occupancy at chapter 5- general builsing height and area .it is quite...

it is special industrial ocupancy.anyway,thanks

NFPA5000 29.3.5.1.3does allow power generation buildings to be exempted a little,but 33chapter high rise building is same with NFPA1,and states chapter 16~30,is modified by this chapter,which means chapter 33 overrides chapter 29,high rise power plant buildings is required with throughout...

Many thanks for your kind reply. i do know that butterfly vlave with eletric switch can be called indicative valve.if not with swich. UL list is good to go,this approach is safer.