Hazen-Williams Water Pressure Drop Flow Rates Equations and Calculator

Fluid Flow Table of Contents | Hydraulic and Pneumatic Knowledge
  Fluid Power Equipment

Hazen-Williams Water Pressure Drop Flow Rates Equations and Calculator

The Hazen–Williams equation is an empirical relationship which relates the flow of water in a pipe with the physical properties of the pipe and the pressure drop caused by friction. It is used in the design of water pipe systems such as fire sprinkler systems , water supply networks , and irrigation systems. It is named after Allen Hazen and Gardner Stewart Williams.

The Hazen–Williams equation has the advantage that the coefficient C is not a function of the Reynolds number , but it has the disadvantage that it is only valid for water . Also, it does not account for the temperature or viscosity of the water.

   Hazen Williams Coefficient, C =          
Pressure drop over pipe length, DP = psi        
Editable Variable Colored Yellow            
Pipe Water Flow Rate in GPM
Length Pipe Diameter in Inches
  Hazen Williams Equation as used in this Calculator:        
      Q = 0.442 C D2.63(DP/L)0.54            
    Q is the water flow rate in gpm          
    D is the pipe diameter in inches          
    L is the pipe length in ft            
    DP is the pressure difference across pipe length L in psi      

Contribute Article Spider Optimizer

© Copyright 2000 - 2020, by Engineers Edge, LLC www.engineersedge.com
All rights reserved
Disclaimer | Feedback
Advertising | Contact | Privacy Policy


Spider Optimizer

Engineering Book Store
Engineering Forum
Excel App. Downloads
Online Books & Manuals
Engineering News
Engineering Videos
Engineering Calculators
Engineering Toolbox
GD&T Training Geometric Dimensioning Tolerancing
DFM DFA Training
Training Online Engineering
Advertising Center

Copyright Notice

Publishing Program