4 Story TH with a Pump

[emeffinp]

I'm working on the design for a 4 story TH unit. The AHJ is requiring, since this is 4 story project, that the system comply with NFPA 13R (though the TH on either side are 13D). The problem is that my hydraulic calculations don't work due to insufficient pressure.

13R bumps me into NFPA 20 for the fire pump, but this is a townhouse - it seems crazy to me to have to put a UL listed fire pump into this type of dwelling. Does anyone have any insight they can offer?

 

[jkauwale]

In this type of situation, you don't have much options. I've gone through a similar type situation for a small school and needed to put in a fire pump and a tank (insufficient pressure and flow).

Justin K, P.E.

http://www.engproguides.com

 

[willard3]

How is this post related to HVAC?