Is there ever a requirement to have additional valves on either side of a fire sprinkler backflow preventer assembly (which includes two vales already)?
My understanding is that if the center backflow body needs to be replaced, it can be replaced by closing the valves that are part of the assembly, removing the center body, and replacing it with the same model center body as the original backflow preventer. Correct me if I'm wrong, but I believe this still retains the listing of the backflow preventer.
Had a review comment for a project in Illinois that an additional OS&Y valve is required on either side of the backflow preventer, which is in addition to the ones provided with the backflow preventer assembly (Illinois Plumbing Code IPC 890.1130 g 2). To me this doesn't provide any benefit to the system, but only introduce additional repair/failure points and provides two more possible locations where the system could be put out of service.
Have you ever seen this before?
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