Roughness and Hazen Williams Coefficients for various pipe materials (carrying water):

One of the values of using the Hazen Williams Equation is that the value C, does not depend on Reynolds Number.

Below you will find a table of various Hazen William Coefficients, grouped by pipe type:

Table 1: Hazen Williams Constants[1]
C
type of pipe or surface material: range clean design
mineral
concrete 85-152 120 100
cement-asbestos 140-160 150 140
vitrified clays 100-140 110
brick sewer 100
iron
cast, plain 80-150 130 100
cast iron, old, unlined 40-120
cast (10 years old) 107-113
cast (20 years old) 89-100
cast (30 years old) 75-90
cast (40 years old) 64-83
cast, tar (asphalt) coated 50-145 130 100
cast, cement lined 130-150 150 140
cast, bituminous lined 130-160 148 140
cast, mitumastic 140-150
cast, sea-coated 100
Ductile Iron Pipe (DIP) 140
Ductile Iron, cement lined 120
galvanized, plain 120
wrought, plain 80-150 130 100
steel
welded and seamless 80-150 140 100
interior riveted, no projecting rivets 139 100
projecting girth rivets 130 100
projecting girth and horizontal rivets 115 100
vitrified, spiral-riveted, flow with lap 110 100
vitrified, spiral-riveted, flow against lap 100 90
corrugated 60 60
concrete lined steel forms 140
coal-tar enamel lined 150-154
miscellaneous
copper and brass 120-150 140 130
wood stave 110-145 120 110
transite
lead, tin, glass 150-120 140 130
Polyethalene (PE and PEH) 140
plastic (PVC and ABS) 120-150 140-150 130
fiber 140
fiberglass 150-160 150 150
fire hose 135
wooden or masonry pipe (smooth) 120
concrete lined wooden forms 120

Note: C values for sludge are 20-40% less than the corresponding water pipe values.


References:

  1. G. Williams & A. Hazen; "Hydraulic Tables, The elements of gagings and the friction of water flowing in pipes, aqueducts, sewers, etc.", 1914 - (Public Domain Version Available) or (via Google Books)

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