The Loss in Fluid Lines Calculator is used to determine pressure loss and head loss for standard-sized piping. Calculations are based on fluid properties such as viscosity and flow rate, and physical specifications for pipes, valves, and fittings. This calculator provides some typical viscosity and specific gravity values for gasoline, water, and SAE 30 motor oil. It also accounts for increases in pressure drop due to scale, dirt, and corrosion.
Nominal Pipe Size:
Pipe Schedule:
Piping Material:
Flow Rate (gpm):
Viscosity (cP):
Typical Viscosity Values
 Gasoline @ 70F 0.6 cP SAE 30 Oil @ 70F 300.0 cP Water @ 70F 1.0 cP
Specific Gravity:
Typical Specific Gravity Values
 Gasoline @ 70F 0.75 SAE 30 Oil @ 70F 0.898 Water @ 70F 1
Temperature: (F)
Piping Length (ft):
Flanged or Butt-Welded Elbows
Tees
Valves
Entrance and Exits
Increasers and Reducers
Precent Addition to Clean Pressure Drop: (Help)
Increasse In Pressure Drop Due to Scale, Dirt, and Corrosion
Some piping systems will experience corrosion, scaling, dirt accumulation, etc. This accumlation will decrease the inner diameter avaliable for flow and change the roughness of the pipe. Both these changes will increase the pressure drop in the system. A typical increase is 20% of the clean pressure drop. If you would like to add this use factor to your calculation enter the percent increase desired below.

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