in a straight pipe   

Pressure loss

in a straight pipe


Calculation of Pressure loss:
  1. Enter volume flow.
  2. Enter density and dynamic viscosity.
  3. Enter inner diameter and pipe walls roughness.
  4. Enter pipe length.
Pressure loss will be calculated for constant density. Pressure loss decreases quadratically with the diameter. Doubling the diameter will drop pressure loss by 75%. Calculation distinguishes between laminar flow (Re < 2320) und turbulent flow (Re > 2320). Since laminar flow can be observed up to Re=8000 pressure loss may be overestimated in the transition zone.

Pressure loss [bar/10m]
Values for water at ambient temperature
(1000 kg/m³, 1 mPas, k=0.1 mm)
5 m³/h 10 m³/h 20 m³/h 40 m³/h
DN25 (d=28mm) 0.264 1.018 4.07 16.28
DN50 (d=55mm) 0.009 0.032 0.119 0.477
DN100 (d=108mm) < 0.001 0.001 0.004 0.014

Means of Calculation Steel Pipe Plastic pipe
Plant
Fluid Temperature ºC
Volume flow* m³/h
Density* kg/m³ Dyn. Viscosity (Newton) mPas
Internal Diameter  d * mm Roughness  k * mm
Pipe length* m




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