Pvc Cpvc Pipes Pressures

Overview

Engineering reference data for Pvc Cpvc Pipes Pressures in fluid mechanics.

Key Formulas

Reynolds Number

$Re = \frac{\rho v D}{\mu}$

Ratio of inertial to viscous forces — determines flow regime.

Bernoulli's Equation

$P + \frac{1}{2}\rho v^2 + \rho g h = \text{const}$

Conservation of energy for steady, inviscid, incompressible flow.

Continuity Equation

$A_1 v_1 = A_2 v_2$

Conservation of mass for incompressible flow.

Darcy-Weisbach

$\Delta P = f \frac{L}{D} \frac{\rho v^2}{2}$

Pressure drop due to friction in a pipe.

Variables

Symbol	Description	Unit
$Re$	Reynolds number	—
$\rho$	Fluid density	kg/m³
$v$	Flow velocity	m/s
$D$	Characteristic dimension	m
$\mu$	Dynamic viscosity	Pa·s
$P$	Pressure	Pa
$f$	Darcy friction factor	—

PVC Pipe Pressure Ratings

The following table presents maximum operating and required minimum bursting pressures at 73°F (23°C) for PVC pipe fittings according to ASTM D1785.

Temperature Derating

Important: Maximum operating pressures derate with temperature. At the maximum operating temperature for PVC (140°F / 60°C), the pressure capacity is derated to approximately 20% of the rated strength at 73°F (23°C).

The relationship can be expressed as a derating factor:

$P_{T} = P_{73°F} \times DR(T)$

Where:

• $P_{T}$ = maximum operating pressure at temperature $T$
• $P_{73°F}$ = rated pressure at 73°F (23°C)
• $DR(T)$ = temperature derating factor (dimensionless)

For PVC at 140°F (60°C): $DR \approx 0.20$

Unit Conversions

From	To	Conversion
1 psi (lb/in²)	Pa (N/m²)	6,894.8 Pa
1 inch	mm	25.4 mm

Interactive Charts

References

• Original Source