NFPA 20 Section 22.214.171.124 (2016 Edition) requires a listed OS&Y gate valve to be installed in the suction pipe, but the annex of NFPA 20 suggests it should be as far as practical from the pump suction.
Would a control valve (OS&Y) on the backflow preventer meet this control valve requirement of Section 126.96.36.199?
Assuming a city water supply, the backflow preventer control valve is listed for fire protection, there is still a valve'd bypass connected between the backflow preventer and pump suction, and the backflow is located a minimum of 10-pipe diameters from the suction flange.
Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
Subscribe and learn something new each day:
Top June '21 Contributors
Get 100 Days of Free Sample Questions right to you!
PE PREP SERIES