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.
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Nominal Pipe Size:
Pipe Schedule:
Piping Material:
Flow Rate (gpm):
Viscosity (cP): (Typical Values)
Typical Viscosity Values
Gasoline @ 70F0.6 cP
SAE 30 Oil @ 70F300.0 cP
Water @ 70F1.0 cP
Specific Gravity: (Typical Values)
Typical Specific Gravity Values
Gasoline @ 70F0.750
SAE 30 Oil @ 70F0.898
Water @ 70F1.000
Temperature: (F)
Piping Length (ft):
Flanged or Butt-Welded Elbows
Threaded Elbows
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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GlobalSpec, Inc. engineering calculators are free for individuals to use via this site under the terms and conditions set out under the Terms of Use of this web site and supplemented by this Engineering Calculator Disclaimer. These calculators are intended solely for general information and educational purposes, and are provided to help decrease the learning curve for those inexperienced in the engineering field and to give more experienced users additional reference tools.

The engineering calculators provided are not intended in any way as engineering advice or services, or as a solicitation for any engineering product or service. Any results from use of these calculators may not be applicable or accurate with regard to the individual circumstances, cannot be relied upon for anything, including, without limitation, engineering designs or decisions, and should not be the basis for any action or inaction on your part. Read Entire Disclaimer

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