Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

Total Pressure or Head Loss in Pipe or Duct Systems

Major and minor loss in pipe, tubes and duct systems

Sponsored Links

The head loss of a pipe, tube or duct system, is the same as that produced in a straight pipe or duct whose length is equal to the pipes of the original systems plus the sum of the equivalent lengths of all the components in the system. This can be expressed as

hloss = Σ hmajor_losses + Σ hminor_losses                                           (1)

where

hloss = total head loss in the pipe or duct system

hmajor_losses = major loss due to friction in the pipe or duct system

hminor_losses = minor loss due to the components in the system

  • Major Head Loss - head loss or pressure loss - due to friction in pipes and ducts.
  • Minor Head Loss - head loss or pressure loss - due to components as valves, bends, tees and the like in the pipe or duct system.

Summarized Major Losses

The major head loss for a single pipe or duct can be expressed as:

hmajor_loss = λ (l / dh) (v2 / 2 g)                                            (2)

where

hloss = head loss (m, ft)

λ = friction coefficient

l = length of duct or pipe (m)

dh = hydraulic diameter (m)

v = flow velocity (m/s, ft/s)

g = acceleration of gravity (m/s2, ft/s2)

Summarized Minor Losses

Minor head loss can be expressed as:

hminor_loss = ξ v2/ 2 g                                            (3)

where

ξ = minor loss coefficient

Since the velocity - v - in equation (2) in general is related to the pipe or duct where the component is located, the sum of the minor losses in a pipe or duct can be expressed as:

Σ hminor_losses = Σ ξ (v2/ 2 g)                                         (4)

The minor loss can be calculated by summarizing the minor loss coefficients - and multiplying the sum with the dynamic pressure head.

Total Head Loss in a Single Pipe or Duct

The total head loss for a single pipe can be calculated by using equation (1) and (3):

hloss_single = λ (l / dh) (v2 / 2 g) + Σ ξ v2/ 2 g                                      (5)

or

hloss_single = (λ (l / dh) + Σ ξ ) (v2/ 2 g)                                          (6)

Total Head Loss in Serial Connected Pipes

The total head loss in several serial connected pipes can be calculated by adding the total head loss in each pipe or duct. The total head loss can be expressed as:

hloss_serial = Σ [(λ1 (l1 / dh1) + Σ ξ1) (v12/ 2 g) + .. + λn (ln / dhn) + Σ ξn) (vn2/ 2 g)]                                     (7)

for 1 to n serial connected pipes

Sponsored Links

Related Topics

Related Documents

Tag Search

  • en: major minor head pressure loss drop pipe tube duct systems
Sponsored Links

Search the Engineering ToolBox

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse!

Translate this page to
About the Engineering ToolBox!

Privacy

We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.

Citation

This page can be cited as

  • Engineering ToolBox, (2004). Total Pressure or Head Loss in Pipe or Duct Systems. [online] Available at: https://www.engineeringtoolbox.com/total-pressure-loss-ducts-pipes-d_625.html [Accessed Day Mo. Year].

Modify access date.

. .

close

3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Scientific Online Calculator

Scientific Calculator

11 19

Sponsored Links
.