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Oil Pipes - Pressure Loss vs. Oil Flow

Pressure drop in oil pipes - viscosities ranging 100 - 600 Saybolt Universal Seconds.

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Oil pipe pressure drops in pounds per square inch (psi) per 100 ft pipe are indicated in the diagrams below. Oil viscosity is ranging 100 - 600 Saybolt Universal Seconds.

NPS 1/2"

Oil pipe NPS 1/2 inch - pressure drop diagram

  • Inside Diameter 0.622 inches

  • 1 gal (US)/min =6.30888x10-5 m3/s = 0.227 m3/h = 0.06309 dm3(liter)/s = 2.228x10-3 ft3/s = 0.1337 ft3/min = 0.8327 Imperial gal (UK)/min
  • 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 = 0.06895 atm = 2.307 Ft. H2O = 16 ounces
  • 1 ft (foot) = 0.3048 m

NPS 3/4"

Oil pipe NPS 3/4 inch - pressure drop diagram

  • Inside Diameter 0.824 inches

NPS 1"

Oil pipe NPS 1 inch - pressure drop diagram

  • Inside Diameter 1.05 inches

NPS 1 1/2"

Oil pipe NPS 1 1/2 inch - pressure drop diagram

  • Inside Diameter 1.61 inches

NPS 2"

Oil pipe NPS 2 inch - pressure drop diagram

  • Inside Diameter 2.067 inches

NPS 4"

Oil pipe NPS 4 inch - pressure drop diagram

  • Inside Diameter 4.026 inches

NPS 6"

Oil pipe NPS 6 inch - pressure drop diagram

  • Inside Diameter 6.065 inches

NPS 8"

Oil pipe NPS 8 inch - pressure drop diagram

  • Inside Diameter 8.03 inches
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