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

Pipe and Tube System Components - Minor (Dynamic) Loss Coefficients

Minor loss coefficients for components used in pipe and tube systems.

Sponsored Links

Minor or dynamic pressure loss in pipe or tube system components can be expressed as

Δp_{minor_loss} = ξ ρ_f v² / 2 (1)

where

ξ = minor loss coefficient

Δp_{minor_loss} = minor pressure loss (Pa (N/m²), psf (lb/ft²))

ρ_f = density of fluid (kg/m³, slugs/ft³)

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

minor loss can also be expressed as head water column - mm H2O or inches H2O

Minor loss coefficients for commonly used pipe and tube system components:

Type of Component or Fitting	Minor Loss Coefficient - ξ -
Tee, Flanged, Dividing Line Flow	0.2
Tee, Threaded, Dividing Line Flow	0.9
Tee, Flanged, Dividing Branched Flow	1.0
Tee, Threaded , Dividing Branch Flow	2.0
Union, Threaded	0.08
Elbow, Flanged Regular 90^o	0.3
Elbow, Threaded Regular 90^o	1.5
Elbow, Threaded Regular 45^o	0.4
Elbow, Flanged Long Radius 90^o	0.2
Elbow, Threaded Long Radius 90^o	0.7
Elbow, Flanged Long Radius 45^o	0.2
Return Bend, Flanged 180^o	0.2
Return Bend, Threaded 180^o	1.5
Globe Valve, Fully Open	10
Angle Valve, Fully Open	2
Gate Valve, Fully Open	0.15
Gate Valve, 1/4 Closed	0.26
Gate Valve, 1/2 Closed	2.1
Gate Valve, 3/4 Closed	17
Swing Check Valve, Forward Flow	2
Ball Valve, Fully Open	0.05
Ball Valve, 1/3 Closed	5.5
Ball Valve, 2/3 Closed	200
Diaphragm Valve, Open	2.3
Diaphragm Valve, Half Open	4.3
Diaphragm Valve, 1/4 Open	21
Water meter	7

Example - Minor Dynamic Pressure Loss in Waterflow a Ball Valve 1/3 Closed

The minor loss a ball valve with flow velocity 2 m/s with water with density 1000 kg/m³ can be calculated as

Δp_{minor_loss} = (5.5) (1000 kg/m³) (2 m/s)² / 2

= 11000 Pa

= 11 kPa

Sponsored Links

Related Topics

Fluid Mechanics - The study of fluids - liquids and gases. Involving velocity, pressure, density and temperature as functions of space and time.
Fluid Flow and Pressure Loss - Pipe lines - fluid flow and pressure loss - water, sewer, steel pipes, pvc pipes, copper tubes and more.

Related Documents

Air Duct Components - Minor Dynamic Loss Coefficients - Minor loss (pressure or head loss) coefficients for air duct components.
Air Ducts - Minor Loss Coefficient Diagrams - Minor loss coefficient diagrams for air ductwork, bends, expansions, inlets and outlets - SI units.
Energy Equation - Pressure Loss vs. Head Loss - Calculate pressure loss - or head loss - in ducts, pipes or tubes.
Equivalent Length Method - Minor Pressure Loss in Piping Systems - Calculate minor pressure loss in piping systems with the Equivalent Pipe Length Method.
Equivalent Length vs. Minor Pressure Head Loss in Pipe and Duct Components - Minor pressure and head loss in pipes vs. equivalent length in tubes and duct systems.
Fittings and Minor Pressure Loss - Minor pressure loss with fittings in piping heating systems.
Hot Water Systems - Equivalent Length vs. Fittings Resistance - Equivalent length of fittings like bends, returns, tees and valves in hot water heating systems - equivalent length in feet and meter.
Pipe and Duct Systems - Total Head Loss - Major and minor loss in pipes, tubes and duct systems.
Pressure Gradient Diagrams - Static pressure graphical presentation throughout a fluid flow system.
PVC Pipes - Equivalent Length and Pressure Loss in Fittings - Minor loss in PVC and CPVC fittings expressed as equivalent length of straight pipe.
Ventilation Ducts - Minor Loss Resistance - Minor pressure or head loss in ventilation ducts vs. air velocity - minor loss coefficient diagram.

Sponsored Links

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

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

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.

Advertise in the ToolBox

If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. You can target the Engineering ToolBox by using AdWords Managed Placements.

Citation

This page can be cited as

Engineering ToolBox, (2004). Pipe and Tube System Components - Minor (Dynamic) Loss Coefficients. [online] Available at: https://www.engineeringtoolbox.com/minor-loss-coefficients-pipes-d_626.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

3 30

Sponsored Links