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# Oil Pipes - Pressure Loss vs. Oil Flow

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

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"

• 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"

• Inside Diameter 0.824 inches

### NPS 1"

• Inside Diameter 1.05 inches

### NPS 1 1/2"

• Inside Diameter 1.61 inches

### NPS 2"

• Inside Diameter 2.067 inches

### NPS 4"

• Inside Diameter 4.026 inches

### NPS 6"

• Inside Diameter 6.065 inches

### NPS 8"

• Inside Diameter 8.03 inches

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Temperature

oC
oF

Length

m
km
in
ft
yards
miles
naut miles

Area

m2
km2
in2
ft2
miles2
acres

Volume

m3
liters
in3
ft3
us gal

Weight

kgf
N
lbf

Velocity

m/s
km/h
ft/min
ft/s
mph
knots

Pressure

Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O

Flow

m3/s
m3/h
US gpm
cfm

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