Document / Project Reference
Single Phase Liquid Hydraulics
Darcy-Weisbach · Swamee-Jain · Fitting K-Losses · Crane TP-410
Screening-level calculation — not a code-compliant design document
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INPUT PARAMETERS
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  |  Hazem ElMancy — Liquid Hydraulics
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HYDRAULICS

Single Phase Liquid Hydraulics

Darcy-Weisbach straight-pipe friction + optional fitting K-losses + static head — calculated ΔP and total head. Swamee-Jain (turbulent) / f = 64/Re (laminar). Industry best practice service velocity & ΔP/km screening checks.

Crane TP-410 Industry Best Practice Swamee-Jain (1976) GPSA §17
All Calculators
Input Parameters
Fluid & Flow
Must be > 0
Must be > 0
Must be > 0
Must be > 0
Pipe Selection
Must be > 0
Roughness values are screening defaults; confirm from project piping class/vendor data.
Default 0.0457 mm — clean commercial carbon steel (Moody / GPSA)
Must be ≥ 0
Fittings / Minor Losses
Minor loss: ΔPK = ΣK·ρv²/2. Use project/vendor K-values for final design.
Elevation & Service
+ uphill  |  − downhill
Industry best practice screening check

Enter parameters and click Calculate.

Methodology

  • Darcy-Weisbach straight-pipe friction: ΔPf = f·(L/D)·(ρv²/2) — incompressible liquid
  • Minor losses: ΔPK = ΣK·(ρv²/2) for selected fittings, valves and entrance/exit losses
  • Turbulent (Re ≥ 4000): Swamee-Jain — f = 0.25/[log(ε/3.7D + 5.74/Re0.9)]²
  • Laminar (Re < 2300): f = 64/Re (Hagen-Poiseuille)
  • Transition (2300–4000): linear interpolation for continuity only; not recommended for final sizing
  • Static: ΔPs = ρ·g·Δz / 10&sup5;; +Δz = uphill
  • All calculations performed in SI internally

Assumptions

  • Steady-state, single-phase incompressible flow
  • Isothermal — ρ and μ constant along pipe
  • Newtonian fluid; selected fitting K-losses are included only when entered by user; equipment/control-valve/vendor losses are excluded unless represented by user-entered K
  • Screening-level result — industry best practice checks from uploaded line-sizing criteria are indicative and subject to project/company criteria

References

  • Crane TP-410: Flow of Fluids Through Valves, Fittings, and Pipe
  • API RP 14E: Offshore Production Platform Piping Systems — used as industry guidance where applicable, not as a universal liquid code limit
  • GPSA Engineering Data Book, Section 17
  • Perry's Chemical Engineers' Handbook