Plastic Pipes Operating Pressure
Reference data and engineering information about plastic pipes operating pressure for material properties applications.
Overview
Engineering reference data for Plastic Pipes Operating Pressure 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 |
Material Properties
The heat resistance characteristics of plastic pipes are critical for determining their suitability in different temperature environments.
Heat Distortion Temperature (HDT)
The temperature at which a standardized test specimen, subjected to a bending load of 18.6 kg/cm², reaches a specified deflection.
Vicat Softening Temperature
The temperature at which a flat-ended needle penetrates 1 mm into a specimen under a load of 1 kg.
Maximum Short-Time Operating Temperature (Without Pressure)
The peak temperature a pipe material can withstand for brief periods without pressure.
Material | HDT Min.(°C) | HDT Max.(°C) | Vicat Softening(°C) | Max. Short-Time(°C) |
|---|---|---|---|---|
| ABS | 104 | 106 | 102.3 | |
| PVC | 54 | 80 | 92 | 95 |
| HDPE | 43 | 49 | 127.3 | 95 |
| LDPE | 32 | 41 | ||
| PP | 57 | 64 | 152.2 | 100 |
Source: engineeringtoolbox.com
Temperature Derating
The operating pressure rating of plastic pipes must be reduced (derated) as the service temperature increases above a baseline (typically 20°C or 68°F). The provided diagram illustrates this critical relationship. Always consult manufacturer-specific derating factors for final engineering design.