main menu MyCT
Main
Forum
Flow in pressurized pipe

     Engineering index
Civil Engineering index
Flow in pressurized pipe diagram
calc
The pressure form of the Hazen-Williams equation is evaluated to provide the pressure loss per unit length and over the entire length of a pipe. Convenient (metric, imperial, US) units may be chosen from the menus.
Pipe diameter:
Pipe length:
Discharge rate:
Roughness coefficient:

Water velocity:
Pressure loss
per
Total pressure loss:
Add login to add

notes
The Hazen-Williams formula is an empirical rule, that holds well for cold water running in pipes under turbulent flow conditions. This is very suitable for situations such as domestic piping and hosing, sprinkler and irrigation systems, etc. For gravitational flow, and for open-channel flow, other calcs are available.
Typical values of the roughness (friction loss) coefficient include: 100 (concrete, cast iron); 120 (steel); 140 (cement); 150 (copper, plastics).