管道 roughness — surface roughness 係數
Surface roughness values 用于 various 管道 材料 used 中 摩擦 损失 calculations.
piperoughness
Overview
Absolute roughness values for common pipe materials, used in friction factor calculations.
Data Table
7 行
Pipe Material | Absolute Roughness (ε)(mm) |
|---|---|
| Drawn tubing (glass, brass, plastic) | 0.0015 |
| Commercial steel / welded steel | 0.045 |
| Galvanized iron | 0.15 |
| Cast iron | 0.26 |
| Concrete | 0.3 |
| Wood stave | 0.5 |
| Riveted steel | 0.9 |
來源: engineeringtoolbox.com
Notes
- Values are at standard conditions unless otherwise noted
- Always verify values for critical applications