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Plant Engineering Calculator

Steam Header Pressure Drop Calculator — Velocity, Friction & Outlet Pressure

Estimate preliminary steam-header friction pressure drop from mass flow, density, pipe diameter, length and Darcy friction factor, with velocity and outlet-pressure checks.

Inputs

Results

Steam velocity 22.64 m/s
Friction pressure drop 0.154 bar
Outlet pressure 9.846 bar abs
Pressure loss 1.54 %

Formula

v=ṁ/(ρA); ΔP=f(L/D)ρv²/2.

Worked example

The calculator exposes velocity alongside Darcy-Weisbach friction so unrealistic high-velocity inputs are visible.

Assumptions & limits

  • Steam density must match the operating pressure/state; this is not an IAPWS solver.
  • Fittings, elevation, condensation and two-phase effects require separate allowances.

FAQs

What does this Steam Header Pressure Drop Calculator calculate?

Estimate preliminary steam-header friction pressure drop from mass flow, density, pipe diameter, length and Darcy friction factor, with velocity and outlet-pressure checks.

Is this suitable for final design?

Use it for transparent engineering screening and diagnostics. Verify final design or operating changes against measured site data, OEM curves and applicable standards.

Why are assumptions shown?

Plant calculations depend on operating boundaries. Explicit assumptions make scenarios auditable and prevent false precision.

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steam pipe sizingsteam velocitysteam header diversity

Last updated: 17 September 2026