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DoCHEng Desk

Engineering-focused workspace for deep execution and structured technical work.

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Free screening calculation

Pipe pressure drop

Estimate major friction loss using a supplied Darcy friction factor.

Equation and assumptions

Δp = fD (L/D) ρv²/2; v = (Q/3600) / [π(D/1000)²/4]

Darcy factor, not Fanning factor. User supplies a factor appropriate to Reynolds number and relative roughness. Full circular pipe, steady incompressible flow. Fittings, elevation, transients and entrance losses are excluded.

The source below supports the underlying unit, mass-balance or hydraulic method. It does not validate this software or a proposed engineering design.

U.S. EPA — EPANET hydraulic modelling

Use for preliminary screening. Verify inputs, physical assumptions and results independently before engineering design, operational changes or safety decisions.

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