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Modifications affecting more than 20 heads

Question asked by cevrard on Oct 19, 2016
Latest reply on Sep 4, 2018 by cfsjenkinssteven86

NFPA 13 2010 Edition states that modifications affecting more than 20 heads must be hydrostatically tested unless the system cannot be isolated.  To what extent is "isolated" considered.  If I have a multi floor office building that is getting a renovation to a large portion of a single floor space, is isolating the floor itself sufficient to require a hydrostatic test or does the specfic work area need to be isolated?  Should the contractor install a control valve to isolate the system before he begins the work with the anticipation of being able to isolate his work?  What if the system is a gridded system and cannot be isolated?