Contents
- Index
Frictional Losses, Flow Measurement and Minor Losses (Resistance Coefficients),
Frictional Losses
Flow Measurement
![](flownozzle.png)
Minor Losses
Minor losses refers to the head loss (or pressure losses) occurring in typical piping systems due to steady-state flow through piping components such as fittings, valves, bends, elbows, tees, inlets, outlets, etc. The head loss caused by flow through these components can be represented with a dimensionless resistance coefficient, K, defined as:
![](headloss.png)
![](defined.png)
![](headloss2.png)
and DP is the pressure loss introduced by the piping component, r is the density, and g is gravitational acceleration.
This library file provides the values of resistance coefficients for the pipe components and other situations shown below. Click on a picture to obtain information for that component.
Expansions
![](k_e_triangularchannelheader.png)
Contractions
![](k_c_triangularchannelheader.png)
Inlets
![](reentrantinlet.png)
Exits
![](reentrantexit.png)
Bends and Elbows
![](k_bend_rect_small.png)
Supply and Extract Branches
Supply Duct - Branch
Supply Duct - Main
![](k_supply_main_small.png)
Supply Duct - Tee
![](k_supply_tee_small.png)
Extract Duct - Branch
![](k_extract_branch_90_small.png)
Extract Duct - Main
Extract Duct - Tee
![](k_extract_tee_small.png)
Valves
Dampers
Tees