Skip to main content
Speclore

ISO 161 Thermoplastic Pipes

Reference data and engineering information about iso 161 thermoplastic pipes for material properties applications.

ISO161thermoplasticpipes

Overview

Engineering reference data for ISO 161 Thermoplastic Pipes in material science and properties.

Key Formulas

Stress

σ=FA\sigma = \frac{F}{A}

Force per unit area.

Strain

ε=ΔLL0\varepsilon = \frac{\Delta L}{L_0}

Change in length per original length.

Hooke's Law

σ=Eε\sigma = E \varepsilon

Stress proportional to strain in elastic region.

Thermal Expansion

ΔL=αL0ΔT\Delta L = \alpha L_0 \Delta T

Length change due to temperature.

Variables

Symbol Description Unit
σ\sigma Stress Pa
ε\varepsilon Strain —
EE Young's modulus Pa
α\alpha Thermal expansion coefficient 1/°C
ΔT\Delta T 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.

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: SDR=Outside DiameterWall Thickness\text{SDR} = \frac{\text{Outside Diameter}}{\text{Wall Thickness}} 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).

Interactive Charts

References