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

Symbol	Description	Unit
$\sigma$	Stress	Pa
$\varepsilon$	Strain	—
$E$	Young's modulus	Pa
$\alpha$	Thermal expansion coefficient	1/°C
$\Delta T$	Temperature change	°C

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

Abbreviation	Full Material Name
PVDF	PolyVinylidene Fluoride
CPVC	Chlorinated Polyvinyl Chloride
PVC	Polyvinyl Chloride
PB	Polybutylene
PEX	Cross-Linked Polyethylene
PE	Polyethylene

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