Wall Thickness (WT) is a critical pipe specification determining structural integrity, pressure capacity, and service life. It’s calculated based on operating pressure, material properties, and safety factors.
Calculation Parameters
| Parameter | Formula | Significance |
|---|---|---|
| Basic Formula | WT = (OD × P) ÷ (2S + P) | P = Design pressure |
| SDR Method | WT = OD ÷ SDR | S = Material strength |
| Safety Factor | Design WT = WT × SF | SF = Safety factor |
| Minimum WT | Per standard | Material dependent |
| Tolerance | +12%/-0% typical | Manufacturing spec |
Standard Calculations
| Pipe Size (OD) | SDR Value | Wall Thickness |
|---|---|---|
| 32mm | SDR 11 | 2.9mm |
| 63mm | SDR 11 | 5.8mm |
| 110mm | SDR 11 | 10.0mm |
| 160mm | SDR 11 | 14.6mm |
| 225mm | SDR 11 | 20.5mm |
Critical Factors
Key considerations:
. Operating pressure
. Temperature effects
. Material properties
. External loads
. Installation method
. Service conditions
Design Requirements
Essential elements:
. Standard compliance
. Pressure rating
. Material selection
. Environmental factors
. Cost efficiency
. Maintenance access
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- Staging Diagrams – Staging diagrams for possession planning
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