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?
Posted anonymously for discussion. Discuss This | Submit a Question | Subscribe
Subscribe and learn something new each day:
Thank You to Our Top September Contributors!
Sprinkler Designer or Engineer?
Get all of our tools, including the Sprinkler Database, Friction Loss Calculator, Fire Pump Analyzer and more:
Daily discussion questions are open-ended questions posed by members for the benefit of sharing expertise and learning from other perspectives. Join as a member here.
2019 PE Prep Guide
PE Prep Series
(Click to enlarge)
Visit July-October for daily Fire Protection PE Exam sample questions.
Solutions are posted the day after posting.
Comment with your solutions, questions or clarifications.
Please note that questions posted are unofficial and in accordance with NCEES rules are intended to be similar to actual exam questions, not actual exam questions themselves.