If I remember correctly, you can convert your outlet (Flow and pressure) to
a K factor K=Q/√P  then just solve for P with your flow number (Q/K)₂.

Jamie Seidl

On Fri, Nov 10, 2023 at 1:28 PM Steve Leyton <[email protected]>
wrote:

> Happy Friday everyone:
>
> Once I’ve taken a flow test, I know the formula for adjusting the flow at
> a particular  residual pressure; it’s published in NFPA 291.   But I’ve
> lost my notes on the corollary formula for calculating the residual
> pressure at a particular flow – does anyone have that handy?   I made cheat
> sheets years ago but they’ve decomposed and become grains in the sands of
> time…
>
>
> Steve L.
>
>
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