There has been a lot of discussion on this post regarding forward flow test connections.
NFPA doesn't address sizing of this connection. The project I'm currently working on is strictly sprinkler with Light and Ordinary Group 1 hazards, with no standpipe connections. The maximum expected flow is 250-300 gallons per minute.
The engineer is showing a 2" forward flow test connection piped to an open fitting on an outside wall. I know that fire pump tests are frequently conducted using 1 3/4" nozzles and easily achieve 250 gpm readings.
Does it make sense that a 2" connection would be adequate in this instance?
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