Pressure drop in pipe calculator

Description

Pressure drop calculator helps you to calculate fluid flow rate through closed pipe. The calculation includes pipe friction factor f and local losses with resistance coefficient K calculation. It can be used for non-compressible flow like liquids as well as for low velocity, short distance gas stream.

Available calculations

pressure drop
flow rate
friction coefficient
flow velocity

In Selection section you can select values to input. Not selected values will be calculated. You select between:

calculation type - pressure drop or flow rate
pipe shape - circular or rectangle
volume and mass flow rate
pressure on pipe start or pipe end
kinematic or dynamic viscosity

In Report section you have instant calculation report for input values. From there you can copy/paste report to your text editor.

Key features

Darcy-Weisbach equation based
Laminar and turbulent flow regime
Round and rectangle pipe
Incompressible flow only

Calculator values

q - volumetric flow rate: Fluid flow rate in terms of units of volume per unit of time
ṁ - mass flow rate: Fluid flow rate in terms of units of mass per unit of time
L - pipe length: Length of a pipe in which pressure drop is calculated
D - pipe diameter: Internal circular pipe diameter
H - channel height: The height of channel for rectangle shaped pipe
W - channel width: The width of channel for rectangle shape pipe
kr - pipe roughness: Pipe internal surface roughness
V - velocity: Flow velocity in terms of units of distance per unit of time
A - area: Internal pipe cross section area
f - friction coefficient: Coefficient of friction for pressure drop due to friction calculation
Re - Reynolds number: Dimensionless number representing viscous versus inertial forces ratio
δ - boundary layer thickness: Thickness of laminar layer formed in turbulent flow connected to pipe wall surface
ρ - fluid density: Mass per unit of volume
ν - kinematic viscosity: Result of fluid particles colliding to each other and moving at different velocities in terms of area per square unit of time
μ - dynamic viscosity: Result of fluid particles colliding to each other and moving at different velocities in terms of mass per square unit of distance and time
K - resistance coefficient: Coefficient used for calculation of minor losses due to local resistances in pipe line like bends, tees, reducers, valves, etc.
p₁ - pressure on the inlet: Absolute pressure at the pipe start
p₂ - pressure on the outlet: Absolute pressure at the pipe end
p₁ - p₂ - pressure drop: Pressure difference between pipe start and pipe end

Related links:: Read more on Darcy-Weisbach equation
: Relation between Reynolds number, relative roughness and friction coefficient - Moody chart
: Find more about Osborne Reynolds, prominent innovator on Wikipedia.

Flow calculators pack

Pressure drop calculator

Issues and answers

Description

Available calculations

Key features

Calculator values