Pipe Flow Velocity Calculator
Calculate pipe flow velocity with transparent engineering inputs and the displayed formula.
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Fluids, Pumps and Piping
Screen flow, pressure loss, pump power, NPSH, valve coefficients and related internal-flow relationships with explicit assumptions.
Tool index
Only resources currently allowed by the Part 1 verification gate, Part 2 source policy and rollout flags appear here.
Pipe Flow Rate Calculator
Calculate pipe flow rate with transparent engineering inputs and the displayed formula.
Open calculator →Pipe Diameter from Flow Calculator
Calculate pipe diameter from flow with transparent engineering inputs and the displayed formula.
Open calculator →Pipe Cross-Sectional Area Calculator
Calculate pipe cross-sectional area with transparent engineering inputs and the displayed formula.
Open calculator →Pipe Residence Time Calculator
Calculate pipe residence time with transparent engineering inputs and the displayed formula.
Open calculator →Reynolds Number Calculator
Calculate reynolds number with transparent engineering inputs and the displayed formula.
Open calculator →Fluid Velocity from Reynolds Number Calculator
Calculate fluid velocity from reynolds number with transparent engineering inputs and the displayed formula.
Open calculator →Hydraulic Diameter from Reynolds Number Calculator
Calculate hydraulic diameter from reynolds number with transparent engineering inputs and the displayed formula.
Open calculator →Dynamic Viscosity from Reynolds Number Calculator
Calculate dynamic viscosity from reynolds number with transparent engineering inputs and the displayed formula.
Open calculator →Fluid Density from Reynolds Number Calculator
Calculate fluid density from reynolds number with transparent engineering inputs and the displayed formula.
Open calculator →Darcy-Weisbach Pressure Drop Calculator
Calculate darcy-weisbach pressure drop with transparent engineering inputs and the displayed formula.
Open calculator →Darcy Head Loss Calculator
Calculate darcy head loss with transparent engineering inputs and the displayed formula.
Open calculator →Darcy Friction Factor from Pressure Drop Calculator
Calculate darcy friction factor from pressure drop with transparent engineering inputs and the displayed formula.
Open calculator →Pipe Length from Pressure Drop Calculator
Calculate pipe length from pressure drop with transparent engineering inputs and the displayed formula.
Open calculator →Velocity from Darcy Pressure Drop Calculator
Calculate velocity from darcy pressure drop with transparent engineering inputs and the displayed formula.
Open calculator →Pump Hydraulic Power Calculator
Calculate pump hydraulic power with transparent engineering inputs and the displayed formula.
Open calculator →Pump Shaft Power Calculator
Calculate pump shaft power with transparent engineering inputs and the displayed formula.
Open calculator →Pump Head from Power Calculator
Calculate pump head from power with transparent engineering inputs and the displayed formula.
Open calculator →Pump Flow from Power Calculator
Calculate pump flow from power with transparent engineering inputs and the displayed formula.
Open calculator →Pump Efficiency Calculator
Calculate pump efficiency with transparent engineering inputs and the displayed formula.
Open calculator →NPSH Available Calculator
Calculate npsh available with transparent engineering inputs and the displayed formula.
Open calculator →Liquid Valve Cv Calculator
Calculate liquid valve cv with transparent engineering inputs and the displayed formula.
Open calculator →Liquid Valve Kv Calculator
Calculate liquid valve kv with transparent engineering inputs and the displayed formula.
Open calculator →Orifice Flow Calculator
Calculate orifice flow with transparent engineering inputs and the displayed formula.
Open calculator →Hydrostatic Pressure Calculator
Calculate hydrostatic pressure with transparent engineering inputs and the displayed formula.
Open calculator →Learning path
- Start with continuity and Reynolds-number calculations.
- Identify the flow regime before choosing a friction-factor method.
- Use Darcy-Weisbach for major pipe loss with an appropriate Darcy friction factor.
- Add pump power and system-head checks for the operating case.
- Check NPSH and manufacturer data before equipment selection or operation.
Glossary
- Reynolds number
- A dimensionless ratio comparing inertial and viscous effects in a flow.
- Darcy friction factor
- The dimensionless resistance factor used in the Darcy-Weisbach pipe-loss equation.
- Relative roughness
- Pipe roughness divided by hydraulic diameter.
- Head loss
- Mechanical energy loss per unit weight of fluid, commonly expressed as a fluid-column height.
- NPSH available
- A suction-side energy margin above vapor-pressure head under the stated reference conditions.
- Cv
- A valve flow coefficient used with US customary liquid-flow relationships.
- Kv
- A valve flow coefficient commonly used with metric liquid-flow relationships.
- Hydraulic diameter
- A characteristic length used to apply internal-flow relationships to non-circular passages.
Worked examples
Examples are calculated from PROFENG's own tool defaults. Confirmed-source examples may be indexable; examples whose exact formula source remains pending stay noindex.
Pipe Flow Velocity Calculator worked example
(0.05)/(Math.PI*(0.1)*(0.1)/4) = 6.366 m/s
Open worked example →Pipe Flow Rate Calculator worked example
Math.PI*(0.1)*(0.1)/4*(2) = 0.016 m³/s
Open worked example →Pipe Diameter from Flow Calculator worked example
Math.sqrt(4*(0.05)/(Math.PI*(2))) = 0.178 m
Open worked example →Pipe Cross-Sectional Area Calculator worked example
Math.PI*(0.1)*(0.1)/4 = 0.008 m²
Open worked example →Pipe Residence Time Calculator worked example
(Math.PI*(0.1)*(0.1)/4*(100))/(0.01) = 78.54 s
Open worked example →Reynolds Number Calculator worked example
(998)*(2)*(0.1)/(0.001) = 199,600
Open worked example →Fluid Velocity from Reynolds Number Calculator worked example
(100000)*(0.001)/((998)*(0.1)) = 1.002 m/s
Open worked example →Hydraulic Diameter from Reynolds Number Calculator worked example
(100000)*(0.001)/((998)*(2)) = 0.05 m
Open worked example →Dynamic Viscosity from Reynolds Number Calculator worked example
(998)*(2)*(0.1)/(100000) = 0.001996 Pa·s
Open worked example →Fluid Density from Reynolds Number Calculator worked example
(100000)*(0.001)/((2)*(0.1)) = 500 kg/m³
Open worked example →Darcy-Weisbach Pressure Drop Calculator worked example
(0.02)*((100)/(0.1))*(998)*(2)*(2)/2 = 39,920 Pa
Open worked example →Darcy Head Loss Calculator worked example
(0.02)*((100)/(0.1))*(2)*(2)/(2*9.80665) = 4.079 m
Open worked example →Darcy Friction Factor from Pressure Drop Calculator worked example
2*(40000)*(0.1)/((100)*(998)*(2)*(2)) = 0.02004
Open worked example →Pipe Length from Pressure Drop Calculator worked example
2*(40000)*(0.1)/((0.02)*(998)*(2)*(2)) = 100.2 m
Open worked example →Velocity from Darcy Pressure Drop Calculator worked example
Math.sqrt(2*(40000)*(0.1)/((0.02)*(100)*(998))) = 2.002 m/s
Open worked example →