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Engineering ToolBox > Head Loss in Oil Pipes
Head or pressure loss in oil pipes with laminar flow can be calculated with the table below:
| Viscosity (cSt) | 4.0 | 25 | 45 | 250 | 500 |
| Head loss (m) | 1.7x104 f/d4 | 11x104 f/d4 | 20x104 f/d4 | 110x104 f/d4 | 220x104 f/d4 |
where
h = head loss in meter oil per meter oil pipe. Length of pipe includes allowances for bends, valves and fittings (m)
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) | 4.0 | 25 | 45 | 250 | 500 |
| Reynolds number | 32x104 f/d | 4.5x104 f/d | 2.8x104 f/d | 0.45x104 f/d | 0.25x104 f/d |