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We have a project that we are doing that has a gridded dry sprinkler system? I know that these are now prohibited and have been for a while. The system is not that old however. We are curious along w/ the local AHJ what year gridded dry systems became prohibited per NFPA 13. Anyone know?

Thanks for all the help. I'll see what I can come up w/ and let you all know the outcome.

The Express standpipe is a great suggestion and is actually one of our options. Did you find that the cost of running the extra standpipe and cla-val station was dramatically cheaper? As far as the VFD pump controller, how do you get that to work if your pump is at Ground Level and the highest...

Our company is currently designing a 21 Story High Rise Building. The Local AHJ requires 125 psi minimum at each FHV and will not allow more than 175 psi at each FHV. Our initial approach was a fire pump and PRV for each floor and PRFHV's at each level. Now we are looking at possibly trying to...