Standard Dimension Ratio (SDR) is a standardized method for expressing pipe dimensions, calculated by dividing the pipe’s outside diameter (OD) by its wall thickness (WT), crucial for pressure rating determination.
Calculation Formula
| Parameter | Formula | Example |
|---|---|---|
| SDR Value | OD ÷ WT | 110mm ÷ 10mm = SDR 11 |
| Wall Thickness | OD ÷ SDR | 110mm ÷ 11 = 10mm |
| Pressure Rating | Material Dependent | PE100: SDR 11 = PN16 |
Common SDR Values
| SDR | Pressure Rating | Application |
|---|---|---|
| 7.4 | PN25 | Extreme pressure |
| 9 | PN20 | High pressure |
| 11 | PN16 | Standard pressure |
| 17 | PN10 | Medium pressure |
| 21 | PN8 | Low pressure |
| 26 | PN6 | Gravity systems |
Selection Factors
Key considerations:
. Operating pressure
. Material properties
. Temperature effects
. Safety factors
. Installation method
. Cost implications
Design Parameters
Essential elements:
. System requirements
. Material selection
. Pressure calculations
. Temperature rating
. Safety margins
. Economic factors
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