Steel Pipes Schedule 40 - Friction loss and Velocity Diagram

Friction loss and velocity diagrams - in imperial (psi/100 ft, ft/s) and SI (Pa/100m, m/s) units

The diagram below indicates friction loss for water flow through ASME/ANSI B36.10/19 schedule 40 steel pipes.

The pressure drop calculations are made with the D'Arcy-Weisbach Equation.

Pressure Drop - Imperial Units

pressure drop and velocity diagram schedule 40 steel pipe, psi per 100 feet

  • 1 gal (US)/min =6.30888x10-5 m3/s = 0.0227 m3/h = 0.06309 dm3(litre)/s = 2.228x10-3 ft3/s = 0.1337 ft3/min
  • 1 ft/s = 0.3048 m/s
  • 1 psi (lb/in2) = 6,894.8 Pa (N/m2) = 6.895x10-3 N/mm2 = 6.895x10-2 bar = 27.71 in H2O at 62oF (16.7oC) = 703.1 mm H2O at 62oF (16.7oC) = 2.0416 in mercury at 62oF (16.7oC) = 51.8 mm mercury at 62oF (16.7oC) = 703.6 kg/m2 = 2.307 Ft. H2O

Pressure Drop - SI Units

pressure drop and velocity diagram schedule 40 steel pipe, Pa per 100 meter

  • 1 Pa = 10-6 N/mm2 = 10-5 bar = 0.1020 kp/m2 = 1.02x10-4 m H2O = 9.869x10-6 atm = 1.45x10-4 psi (lbf/in2)
  • 1 liter/s = 10-3 m3/s = 3.6 m3/h = 0.03532 ft3/s = 2.1189 ft3/min (cfm) = 13.200 Imp.gal (UK)/min = 15.852 gal (US)/min = 792 Imp. gal (UK)/h
  • 1 m/s = 3.6 km/h = 196.85 ft/min = 2.237 mph

A table presentation of the diagrams above: "Steel Pipe Schedule 40 - Friction loss and Velocities".

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