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Page
24
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Pipe Material
Roughness Factor
Non ferrous metal
Glass
Plastics
Light metal
0.01
Drawn steel pipes:
•
Fine planed, polished surface
•
Plane surface
•
Rough planed surface
0.01
Welded steel pipes, new:
•
Long usage, cleaned
•
Lightly and evenly rusted
•
Heavily encrusted
0.1
Cast iron pipes:
•
Bitumen lining
•
New, without lining
•
Rusted / Encrusted
1.0