Oil Pipes - Head Loss
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.
Viscosity (cSt)
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