Pipe absolute roughness
Pipe absolute roughness (e) tabulated are taken from from several sources. These values are for new pipes and typically for new design purpose. For aged pipes or debottlenecking purpose, higher roughness are expected.
Pipe absolute roughness (e) tabulated are taken from from several sources. These values are for new pipes and typically for new design purpose. For aged pipes or debottlenecking purpose, higher roughness are expected.
| Piping Material | Absolute roughness (Micron) | Source |
| drawn brass | 1.5 | (1,2) |
| drawn copper | 1.5 | (1,2) |
| commercial steel | 45 | (1,2) |
| wrought iron | 45 | (1,2) |
| asphalted cast iron | 120 | (1,2) |
| galvanized iron | 150 | (1,2) |
| cast iron | 260 | (1,2) |
| wood stave | 200 to 900 | (1,2) |
| concrete | 300 to 3000 | (1,2) |
| riveted steel | 900 to 9000 | (1,2) |
| Rubber (smooth) | 6 to 70 | (3) |
| Rubber (wire-reinforce) | 300 to 4000 | (3) |
| Stainless Steel / Titanium / Cu-Ni | 45.7 | (4) |
| Carbon steel (CS) non-corroded - General | 45.7 | (4) |
| Carbon steel (CS) non-corroded - Relief system | 150 | (4) |
| Carbon steel (CS) corroded | 457 | (4) |
| Fiberglass | 5 | (5) |
| PVC | 1.5 | (6) |
| Copper | 1.5 | (6) |
| Aluminum | 1.5 | (6) |
| RedBrass | 1.5 | (6) |
* 1m = 1,000 mm = 1,000,000 micron ; 1 mm = 1,000 micron
Pipe Relative roughness
Relative pipe roughness is the ratio of absolute roughness (e) by and pipe diameter (D) :
Relative Pipe Roughness = e/D
(1) Binder, R.C. (1973), Fluid Mechanics, Prentice-Hall, Inc. (Englewood Cliffs, NJ).
(2) GPSA & Crane Technical Paper No. 410M
(3) Darby, R. (2001), Fluid Mechanics for Chemical Engineers, Vol 2, Marcel Dekker, (NY)
(4) BP GP 44-80
(5) Fiberglass Pipe Handbook, SPI Composites Institute
(6) Enginereed Software’s PIPE-FLO software www.engineered-software.com
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