Index

Frictional Losses, Flow Measurement and Minor Losses (Resistance Coefficients),

Frictional Losses

Flow Measurement

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:

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

Contractions

Inlets


Exits


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

Valves


Dampers


Tees