Pipe Fittings: Elbow, 90°, threaded, standard, (r/D = 1) to Tee, Through-branch, (as elbow), flanged, (r/D = 1)
Pipe fittings loss coefficients — Darby 3K method K-factors for elbows, tees, valves, and other fittings
| fitting type | K1 (dimensionless) | K ref (dimensionless) | Kd (dimensionless) | Ki (dimensionless) | category | description |
|---|---|---|---|---|---|---|
| Elbow, 90°, threaded, standard, (r/D = 1) | 800 | 0.602861 | 4 | 0.14 | Elbow | Darby 3K: K = 800.0/Re + 0.14*(1 + 4.0/D^0.3) |
| Tee, Run-through, flanged, (r/D = 1) | 150 | 0.21395 | 4 | 0.05 | Tee | Darby 3K: K = 150.0/Re + 0.05*(1 + 4.0/D^0.3) |
| Tee, Run-through, stub-in branch | 100 | 0.001 | 0 | 0 | Tee | Darby 3K: K = 100.0/Re + 0.0*(1 + 0.0/D^0.3) |
| Tee, Run-through, threaded, (r/D = 1) | 200 | 0.38866 | 4 | 0.091 | Tee | Darby 3K: K = 200.0/Re + 0.091*(1 + 4.0/D^0.3) |
| Tee, Through-branch, (as elbow), flanged, (r/D = 1) | 800 | 1.197723 | 4 | 0.28 | Tee | Darby 3K: K = 800.0/Re + 0.28*(1 + 4.0/D^0.3) |
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