bmlxd40
Mechanical
- Oct 7, 2011
- 82
Hey folks.
I am designing a high-rise mixed use building. The building is primarily a residential apartment building that sits on top of 8 floors of parking. There is also 5 floors of retail\office attached to the parking structure. We will have high pressure standpipes with PRV's in the two stairs that run the full height of the residential tower, and we will have automatic dry standpipes in the two parking deck stairs. In the retail\office portion of the building, we have multiple retail spaces that will be each be supplied off of their own separate control valve.
What we want to do is to tee off of the high pressure standpipe supply with two, 6" Master PRV's in the pump room (to comply with NFPA 14, 2013 ed. 7.2.4(3) ) and use it to supply the retail area sprinkler systems, and the combo standpipe in the 5 floors of office, plus use it to supply the parking deck sprinkler system. Obviously we will have to have an additional FDC down stream of the two Master PRV's, but economically, this seems to be the best route because it saves us a lot of 2.5" PRV Hose valves and control valves for the combo standpipe and retail areas, plus testing ports and a 3" express drain.
My concern is weather or not this design meets the interconnection requirements of NFPA 14 7.5, especially when we look at what the annex to 7.5 has to say about FDC's being arranged to supply all interconnected standpipes.
Your thoughts are appreciated.
I am designing a high-rise mixed use building. The building is primarily a residential apartment building that sits on top of 8 floors of parking. There is also 5 floors of retail\office attached to the parking structure. We will have high pressure standpipes with PRV's in the two stairs that run the full height of the residential tower, and we will have automatic dry standpipes in the two parking deck stairs. In the retail\office portion of the building, we have multiple retail spaces that will be each be supplied off of their own separate control valve.
What we want to do is to tee off of the high pressure standpipe supply with two, 6" Master PRV's in the pump room (to comply with NFPA 14, 2013 ed. 7.2.4(3) ) and use it to supply the retail area sprinkler systems, and the combo standpipe in the 5 floors of office, plus use it to supply the parking deck sprinkler system. Obviously we will have to have an additional FDC down stream of the two Master PRV's, but economically, this seems to be the best route because it saves us a lot of 2.5" PRV Hose valves and control valves for the combo standpipe and retail areas, plus testing ports and a 3" express drain.
My concern is weather or not this design meets the interconnection requirements of NFPA 14 7.5, especially when we look at what the annex to 7.5 has to say about FDC's being arranged to supply all interconnected standpipes.
Your thoughts are appreciated.