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Unlock Pipe pressure loss
How much pressure does the run cost?
Calculate pressure drop in a pipe section with Darcy-Weisbach: friction loss f·(L/D)·ρv²/2 plus local loss from fittings K·ρv²/2. Friction factor found from Reynolds number (laminar 64/Re; turbulent via Swamee-Jain). Roughness and K-values are entered from material/manufacturer data — no table values are invented.
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