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eng.pressure-drop Calculator
Calculates pressure drop through a pipe system including friction and minor losses from fittings and valves. Minor losses (K × ½ρv²) from fittings can equal or exceed friction losses in short, complex piping systems with many valves.
Inputs
Q
Volume of fluid per unit time. Used to size pipes, pumps, and ducts.
D
Internal diameter of the pipe. Larger diameter reduces velocity and pressure drop but increases material cost.
L
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Vis
Fluid resistance to flow. Water at 20°C: ~1 cP. Honey: 2,000–10,000 cP. Higher viscosity increases pumping power requirements.
Results
pressure drop (kPa)
Pressure lost to friction as fluid moves through the pipe or system. Higher drop = more pumping power required. Reduce by using larger pipes, fewer bends, or lower flow velocity.
velocity (m/s)
Reference formula or conversion factor shown for context.
A dimensionless multiplier applied in the calculation.
flow regime
Whether the flow is laminar (smooth, ordered) or turbulent (chaotic). Determined by the Reynolds number: below 2,300 = laminar; above 4,000 = turbulent.
pressure drop (bar)
Pressure lost to friction as fluid moves through the pipe or system. Higher drop = more pumping power required. Reduce by using larger pipes, fewer bends, or lower flow velocity.