Description

Calculate the head loss in water flowing through pipes using the Darcy-Weisbach formula and the Churchill correlation for the friction factor calculation.

 

There are five calculation possibilities:

• Find the head loss
• Find the diameter
• Find the length
• Find the internal roughness of the pipe
• Find the flow

 

Surface	Absolute Roughness Coefficient $k$ (mm)
Drawn Copper, Lead, Brass, Aluminum (new) and the like	0.001 - 0.002
PVC, PE and other smooth Plastic Pipes	0.0015 - 0.007
Stainless steel, bead blasted	0.001 - 0.006
Stainless steel, turned	0.0004 - 0.006
Stainless steel, electron-polished	0.0001 - 0.0008
Commercial steel or wrought iron	0.045 - 0.09
Stretched steel	0.015
Weld steel	0.045
Galvanized steel	0.15
Rusted steel (corrosion)	0.15 - 4
New cast iron	0.25 - 0.8
Worn cast iron	0.8 - 1.5
Rusty cast iron	1.5 - 2.5
Sheet or asphalted cast iron	0.01 - 0.015
Smoothed cement	0.3
Ordinary concrete	0.3 - 1
Coarse concrete	0.3 - 5
Wood stove	0.18 - 0.9
Well planed wood	0.18 - 0.9
Ordinary wood	5

Source: Extracted from https://www.engineeringtoolbox.com/surface-roughness-ventilation-ducts-d_209.html. Last seen on 08/29/2023