ISO 161 Thermoplastic Pipes
Reference data and engineering information about iso 161 thermoplastic pipes for material properties applications.
Overview
Engineering reference data for ISO 161 Thermoplastic Pipes in material science and properties.
Key Formulas
Stress
Force per unit area.
Strain
Change in length per original length.
Hooke's Law
Stress proportional to strain in elastic region.
Thermal Expansion
Length change due to temperature.
Variables
| Symbol | Description | Unit |
|---|---|---|
| Stress | Pa | |
| Strain | — | |
| Young's modulus | Pa | |
| Thermal expansion coefficient | 1/°C | |
| Temperature change | °C |
Pipe Dimensions Table
The following table provides the nominal outside diameters and minimum wall thicknesses for thermoplastic pipes in metric series, as specified in ISO 161-1 and ISO 11922.
Nominal Outside Diameter(mm) | Series 20 (SDR 41, PN 6.3)(mm) | Series 12.5 (SDR 26, PN 10)(mm) | Series 8 (SDR 17, PN 16)(mm) | Series 6.3 (SDR 13.6, PN 20)(mm) | Series 5 (SDR 11, PN 25)(mm) |
|---|---|---|---|---|---|
| 20 | 1.2 | 1.5 | 1.9 | ||
| 25 | 1.5 | 1.9 | 2.3 | ||
| 32 | 1.9 | 2.4 | 2.9 | ||
| 40 | 1.6 | 2.4 | 3.0 | 3.7 | |
| 50 | 1.3 | 2.0 | 3.0 | 3.7 | 4.6 |
| 63 | 1.6 | 2.5 | 3.8 | 4.7 | 5.8 |
| 75 | 1.9 | 2.9 | 4.5 | 5.6 | 6.8 |
| 90 | 2.2 | 3.5 | 5.4 | 6.7 | 8.2 |
| 110 | 2.7 | 4.2 | 6.6 | 8.1 | 10.0 |
| 125 | 3.1 | 4.8 | 7.4 | 9.2 | 11.4 |
| 140 | 3.5 | 5.4 | 8.3 | 10.3 | 12.7 |
| 160 | 4.0 | 6.2 | 9.5 | 11.8 | 14.6 |
| 200 | 4.9 | 7.7 | 11.9 | 14.7 | 18.2 |
| 225 | 5.5 | 8.6 | 13.4 | 16.6 | 20.5 |
| 250 | 6.2 | 9.6 | 14.8 | 18.4 | 22.7 |
| 280 | 6.9 | 10.7 | 16.6 | 20.6 | 25.4 |
| 315 | 7.7 | 12.1 | 18.7 | 23.2 | 28.6 |
| 400 | 9.8 | 15.3 | 23.7 | 29.4 | 36.3 |
Source: engineeringtoolbox.com
Understanding Pipe Series and SDR
The Series number in the table header indicates the relationship between the pipe's outside diameter and its wall thickness. A lower series number means a thicker wall relative to the diameter for a given nominal size.
Standard Dimension Ratio (SDR) is a critical parameter defined as: For example, *SDR 11 means the outside diameter is 11 times the minimum wall thickness. SDR is directly related to the pipe's pressure rating.
Nominal Pressure (PN) is the maximum permissible operating pressure (in bar) at 20°C for water. The relationship between PN and SDR depends on the material's long-term hydrostatic strength, often characterized by the Minimum Required Strength (MRS).