Frictional Losses, Flow Measurement and Minor Losses (Resistance Coefficients),
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:
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.
Bends and Elbows
Supply and Extract Branches
Supply Duct - Branch
Supply Duct - Main
Supply Duct - Tee
Extract Duct - Branch
Extract Duct - Main
Extract Duct - Tee