I have observed forward-flow tests of backflow preventers, and fire pumps tests, that are conducted through 2.5-inch nozzles identical to the image below, but without the playpipe tip screwed onto the end of the nozzle.
The pitot reading was taken off the 1-3/4" threaded end of the nozzle where the playpipe tip gets screwed on.
Is this approach acceptable, and would the GPM table for the 1-3/4" butt for converting the pitot pressure to flow be acceptable?
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PE PREP SERIES