Advanced Finishing Systems

Technical Info: Pressure Drop

Compressed Air Data Conversion Data Cover Per Gallon Decimal Equivalents Friction of an Air Hose Friction of Air in Pipes

General Conversion Micronic Particles Pressure Drop Viscosities Wire Screen Filter Data

Pressure Drop

Calculate pressure drop in pipe or tube length by use of the formula:

P = (0.0273 QVL) / D⁴

Where:

P = Pressure drop in pounds per inch (PS)
Q = Flow rate in gallons per minute (GPM)
L = Length of pipe in feet
V = Viscosity of fluid in poise
D⁴ = Tube or pipe factor (4th power of Diameter in inches)

Tube and Pipe Factors

Tube or Pipe Size (inches) Factor D⁴
1/4 I.D. Nylon Tube 0.0039
1/4 Schedule 40 Pipe 0.18
3/8 Schedule 40 Pipe 0.159
1/2 Schedule 40 Pipe 0.15
3/4 Schedule 40 Pipe 0.46
1 Schedule Pipe 1.21
1 1/4 Schedule 40 Pipe 3.6
1 1/2 Schedule 40 Pipe 6.65
2 Schedule 40 Pipe 18.3