|
| Material |
Nature of Material |
Roughness [mm] |
Roughness [inch] |
| | | | |
| Steel pipe | drawn, new | 0.02 - 0.1 | 0.0008 - 0.004 |
| welded, new | 0.05 - 0.1 | 0.002 - 0.004 |
| galvanized, new | 0.15 | 0.006 |
| used, cleaned | 0.15 - 0.2 | 0.006 - 0.008 |
| lightly corroded | 0.1 - 0.4 | 0.004 - 0.016 |
| severely corroded | 0.4 - 3 | 0.016 - 0.12 |
| light scaling | 1 - 1.5 | 0.04 - 0.06 |
| heavy scaling | 1.5 - 4 | 0.06 - 0.16 |
| bitumed coated | 0.05 | 0.002 |
| | | | |
| cast - iron pipe | new | 0.25 - 1 | 0.01 - 0.04 |
| corroded | 1 - 2 | 0.04 - 0.08 |
| with scaling | 1 - 4 | 0.04 - 0.16 |
| | | | |
| concrete pipe | smooth finish | 0.3 - 1 | 0.012 - 0.04 |
| rough | 1 - 3 | 0.04 - 0.12 |
| | | | |
| Sheet steel | smooth | 0.07 | 0.0028 |
| | | | |
| Glass, lead, copper, brass | | 0.0001 - 0.0015 | 4·10-6 - 60·10-6 |
|