Would anyone with a library know if hydraulics were referenced in the 1976 edition of NFPA 13? I'm going to be replacing a dry system with MIC installed in 1984 under this edition. It almost looks pipe scheduled except for the main (assuming the schedules for LH haven't changed). I'm assuming the 30% increase wasn't there either. :P Analyzing the existing system hydraulically, I have densities in excess of 0.5 in the larger areas with not more than 80-90 SF per head throughout.
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