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NFPA - gives tables and methods for sizing fire fighting wet sprinklers system based on hazards, sprinklers type & pipe materials etc.but all this procedure is applicable for a tree system design.
Considering loop system design for the same system, NFPA says you have to calculate pipe sizes by hydro lice calculations.
My question is about what is the step by step procedure & factors to consider while sizing pipes based on loop design?
search nfpa 13 for " pipe schedule method".