# Steel Pipe 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

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

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

- Fluid :
*Water* - Pipe :
*Steel Pipe - Schedule 40* - Temperature :
*20.0*^{o}C (68.0^{o}F) - Density :
*998.3 kg/m*^{3}(62.0 lb/ft^{3}) - Kinematic Viscosity :
*1.004 10*^{-6}m^{2}/s (0.01 stokes) (1.08E-5 ft^{2}/s) - Pipe Roughness Coefficient :
*4.5 10*^{-5}

### Pressure Drop - Imperial Units

*1 gal (US)/min =6.30888x10*^{-5}m^{3}/s = 0.0227 m^{3}/h = 0.06309 dm^{3}(litre)/s = 2.228x10^{-3}ft^{3}/s = 0.1337 ft^{3}/min*1 ft/s = 0.3048 m/s**1 psi (lb/in*^{2}) = 6,894.8 Pa (N/m^{2}) = 6.895x10^{-3}N/mm^{2}= 6.895x10^{-2}bar = 27.71 in H_{2}O at 62^{o}F (16.7^{o}C) = 703.1 mm H_{2}O at 62^{o}F (16.7^{o}C) = 2.0416 in mercury at 62^{o}F (16.7^{o}C) = 51.8 mm mercury at 62^{o}F (16.7^{o}C) = 703.6 kg/m^{2}= 2.307 Ft. H_{2}O

### Pressure Drop - SI Units

*1 Pa = 10*^{-6}N/mm^{2}= 10^{-5}bar = 0.1020 kp/m^{2}= 1.02x10^{-4}m H_{2}O = 9.869x10^{-6}atm = 1.45x10^{-4}psi (lbf/in^{2})*1 liter/s = 10*^{-3}m^{3}/s = 3.6 m^{3}/h = 0.03532 ft^{3}/s = 2.1189 ft^{3}/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 can be found in "Steel Pipe Schedule 40 - Friction loss and Velocities".

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