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is it allowable to burry or pass sprinkler cross main pipe at below the floor in some part of a building?

Question asked by alirezazamani on Feb 29, 2020
Latest reply on Mar 2, 2020 by milt.werner

due to architectural considerations, the main pipe must pass under the floor in some part of the building, is it permitted?
What are its requirements? is it possible to burry the pipe and backfilling? or it should pass in a trench?  Should it be equipped with an isolating valve before that?