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Steel Pipe Schedule 40 Friction Loss Diagram

Reference data and engineering information about steel pipe schedule 40 friction loss diagram for fluid mechanics applications.

steelpipeschedulefrictionData Table

Overview

Engineering reference data for Steel Pipe Schedule 40 Friction Loss Diagram in fluid mechanics.

Key Formulas

Reynolds Number

Re=ρvDμRe = \frac{\rho v D}{\mu}

Ratio of inertial to viscous forces — determines flow regime.

Bernoulli's Equation

P+12ρv2+ρgh=constP + \frac{1}{2}\rho v^2 + \rho g h = \text{const}

Conservation of energy for steady, inviscid, incompressible flow.

Continuity Equation

A1v1=A2v2A_1 v_1 = A_2 v_2

Conservation of mass for incompressible flow.

Darcy-Weisbach

ΔP=fLDρv22\Delta P = f \frac{L}{D} \frac{\rho v^2}{2}

Pressure drop due to friction in a pipe.

Variables

SymbolDescriptionUnit
ReReReynolds number—
ρ\rhoFluid densitykg/m³
vvFlow velocitym/s
DDCharacteristic dimensionm
μ\muDynamic viscosityPa·s
PPPressurePa
ffDarcy friction factor—

Unit Conversion Factors

The following conversion factors are useful when working with friction loss calculations in different unit systems.

Imperial Units

ParameterConversion
1 gal (US)/min6.30888×10−56.30888 \times 10^{-5} m³/s = 0.0227 m³/h = 0.06309 dm³/s = 2.228×10−32.228 \times 10^{-3} ft³/s = 0.1337 ft³/min
1 ft/s0.3048 m/s
1 psi (lb/in²)6,894.8 Pa = 6.895×10−36.895 \times 10^{-3} N/mm² = 6.895×10−26.895 \times 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

SI Units

ParameterConversion
1 Pa10−610^{-6} N/mm² = 10−510^{-5} bar = 0.1020 kp/m² = 1.02×10−41.02 \times 10^{-4} m H₂O = 9.869×10−69.869 \times 10^{-6} atm = 1.45×10−41.45 \times 10^{-4} psi
1 liter/s10−310^{-3} m³/s = 3.6 m³/h = 0.03532 ft³/s = 2.1189 ft³/min (cfm) = 13.200 Imp. gal/min = 15.852 gal (US)/min = 792 Imp. gal/h
1 m/s3.6 km/h = 196.85 ft/min = 2.237 mph

Applicable Standards

This data applies to ASME/ANSI B36.10/19 Schedule 40 steel pipes as specified in the American Society of Mechanical Engineers standards for welded and seamless wrought steel pipe.

References

Source: engineeringtoolbox.com