Steel Pipe Schedule 80 Friction Loss Diagram

Reference data and engineering information about steel pipe schedule 80 friction loss diagram for fluid mechanics applications.

steelpipeschedulefrictionData Table

Overview

Engineering reference data for Steel Pipe Schedule 80 Friction Loss Diagram 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	—

Operating Conditions

The friction loss calculations are based on the following conditions for water flowing through Schedule 80 steel pipes:

Parameter	SI Value	Imperial Value
Fluid	Water	Water
Pipe	Steel Pipe - Schedule 80	Steel Pipe - Schedule 80
Temperature	20.0 °C	68.0 °F
Density	998.3 kg/m³	62.0 lb/ft³
Kinematic Viscosity	1.004 × 10⁻⁶ m²/s (0.01 stokes)	1.08 × 10⁻⁵ ft²/s
Pipe Roughness Coefficient	4.5 × 10⁻⁵ m	—

Unit Conversions

Pressure Conversions

From	To
1 Pa	10⁻⁶ N/mm² = 10⁻⁵ bar = 0.1020 kp/m² = 1.02 × 10⁻⁴ m H₂O = 9.869 × 10⁻⁶ atm = 1.45 × 10⁻⁴ psi
1 psi	6,894.8 Pa = 6.895 × 10⁻³ N/mm² = 6.895 × 10⁻² bar = 27.71 in H₂O at 61 °F = 703.1 mm H₂O at 61 °F = 2.0416 in mercury at 61 °F = 51.8 mm mercury at 61 °F = 703.6 kg/m² = 2.307 ft H₂O

Flow Rate Conversions

From	To
1 liter/s	10⁻³ m³/s = 3.6 m³/h = 0.03532 ft³/s = 2.1189 ft³/min = 13.200 Imp.gal(UK)/min = 15.852 gal(US)/min = 792 Imp.gal(UK)/h
1 gal(US)/min	6.30888 × 10⁻⁵ m³/s = 0.0227 m³/h = 0.06309 dm³/s = 2.228 × 10⁻³ ft³/s = 0.1337 ft³/min

Velocity Conversions

From	To
1 m/s	3.6 km/h = 196.85 ft/min = 2.237 mph
1 ft/s	0.3048 m/s

References

Original Source

Source: engineeringtoolbox.com