Thermoplastic Pipes Temperature Strength

Overview

Engineering reference data for Thermoplastic Pipes Temperature Strength in material science and properties.

Key Formulas

Stress

$\sigma = \frac{F}{A}$

Force per unit area.

Strain

$\varepsilon = \frac{\Delta L}{L_0}$

Change in length per original length.

Hooke's Law

$\sigma = E \varepsilon$

Stress proportional to strain in elastic region.

Thermal Expansion

$\Delta L = \alpha L_0 \Delta T$

Length change due to temperature.

Variables

Pressure Derating Calculation

The maximum allowable pressure at an elevated temperature is calculated by applying the derating factor to the pipe's rated pressure at 21°C (70°F): $P_{\text{max, T}} = P_{\text{rated}} \times F_T$ Where:

• $P_{\text{max, T}}$ is the maximum operating pressure at temperature T.
• $P_{\text{rated}}$ is the rated pressure at 21°C (70°F).
• $F_T$ is the derating factor at temperature T from the table above.

Example: For a 6-inch Schedule 80 CPVC pipe rated at 167 psi at 21°C (70°F), the maximum operating pressure at 66°C (150°F) is: $P_{\text{max}} = 167 \, \text{psi} \times 0.5 = 83.5 \, \text{psi}$

Material Abbreviations

Important Notes

• The derating factors are for long-term service. A null or "1)" in the table indicates the material is not resistant for continuous use at that temperature, and such operating conditions should be avoided.
• Always consult the specific manufacturer's data for precise derating factors, as formulations can vary.

Interactive Charts

References

• Original Source