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4" pipe is up to100 sprinkler according to NFPA
Do you mean Nos of sprinklers ?
Nos Of Spr = Total Area to be under the sprinkler / NFPA 13 X NFPA 14
the number of sprinklers related to the hazard classification so,
for light hazard4" pipe will serve area and it is more than sprinkler
for ordinary hazard4" pipe will serve up to sprinkler
Yes True. Up to100 Sprinkler heads can be installed with4" NPS.