Pressure drop calculator

incompressible flow, losses due to friction calculation

online since 2006

Registration and subscription

Please login for full calculator service. Use the form on the top of the page.
Register an account if you don't have one.
Active subscription is required for full services.
Action
Calculation setup
Pressures
Flow rates
Coefficients
Flow regime: Flow is turbulent
Pipe dimensions
Fluid properties

Calculator description

Read more about calculator application and check if calculator is suitable for your problem.

Also, read about calculation procedures, what you have to know for the calculations and what limitations apply.

Registration and subscription

Subscribed users have access to the full service which includes:

  • One click switch from metric to imperial units
  • Export results in word or excel format
  • Preview, copy and paste results from a web page to your text editor
  • Send results to you email

Subscribe

Calculator start selection

Read all about available deployments. In any way of utilizing calculator, Internet connection is required, for authentication at least.

Issues and answers

Having problems with calculators usage? Read more about known issues and problems and way to solve it.

issues and answers

Description

p1 - inlet pressure
Absolute pressure at the pipe start
p2 - outlet pressure
Absolute pressure at the pipe end
Δp - pressure drop
Pressure difference between pipe start and pipe end
q - volume 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 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 used for calculation of minor losses due to local resistances in pipe line like bends, tees, reducers, valves, etc.

Calculation setup

Select value to calculate. You should enter not selected one.
Δp
pressure drop
q / ṁ
volume/mass flow rate
D
internal pipe diameter
Select value to input. You should enter selected one. The other one will be calculated
p1
pressure on the pipe start
p2
pressure on the pipe end
Select value to input. You should enter selected one. The other one will be calculated
q
volumetric flow rate
mass flow rate
Select value to input. You should enter selected one. The other one will be calculated
ν
kinematic viscosity
μ
dynamic viscosity
Select pipe shape
round pipe
full cross section fluid flow
rectangle pipe
for rectangle channels and full cross section flow

Related calculators available for download