Oil Pipes - Head Loss
Head or pressure loss due to friction in oil pipes - various viscosity and laminar flow.
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Head or pressure loss in oil pipes with laminar flow can be calculated with the table below:
| Viscosity (cSt) | 4 | 25 | 45 | 250 | 500 |
| Head loss - h - | 1.7 104 f / d4 | 11 104 f / d4 | 20 104 f / d4 | 110 104 f / d4 | 220 104 f / d4 |
where
h = head loss (moil / mpipe ) - meter oil per metre oil pipe - length of pipe includes allowances for bends, valves and fittings
f = flow of oil (liter/s)
d = internal diameter of pipe (mm)
The formula above is for laminar flow where Reynolds Number (Re) is less than 2300.
The Reynolds number can be calculated from the table below:
| Viscosity (cSt) | 4 | 25 | 45 | 250 | 500 |
| Reynolds number | 32 104 f / d | 4.5 104 f / d | 2.8 104 f / d | 0.45 104 f / d | 0.25 104 f / d |
Oil Pipe Head Loss Calculator
The calculator is based on the equations above.
4 25 45 250 500 Viscosity (cSt)
Flow (l/s)
Pipe diameter (mm)
Specific Gravity of Oil
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