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NFPA 13 threaded pipe

Question asked by vshaw on Dec 13, 2016
Latest reply on Dec 18, 2016 by nocivus

NFPA 13, chapter says that screwed unions above 2 inch should not be used.  Does this mean no threaded pipe above 2 inch.  It is a little confusing when chapter 6.3.3 implies threaded pipe may be used for any sized pipe subject to the wall thicknes.