Pipe Fittings: Elbow, 90°, 2 welds, (45°) to Elbow, 90°, threaded, long radius, (r/D = 1.5)
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°, 2 welds, (45°) | 800 | 0.302456 | 4.1 | 0.068 | Elbow | Darby 3K: K = 800.0/Re + 0.068*(1 + 4.1/D^0.3) |
| Elbow, 90°, 3 welds, (30°) | 800 | 0.162401 | 4.2 | 0.035 | Elbow | Darby 3K: K = 800.0/Re + 0.035*(1 + 4.2/D^0.3) |
| Elbow, 90°, flanged, welded, bends, (r/D = 1) | 800 | 0.39466 | 4 | 0.091 | Elbow | Darby 3K: K = 800.0/Re + 0.091*(1 + 4.0/D^0.3) |
| Elbow, 90°, mitered, 1 weld, (90°) | 1,000 | 1.157233 | 4 | 0.27 | Elbow | Darby 3K: K = 1000.0/Re + 0.27*(1 + 4.0/D^0.3) |
| Elbow, 90°, threaded, long radius, (r/D = 1.5) | 800 | 0.321214 | 4.2 | 0.071 | Elbow | Darby 3K: K = 800.0/Re + 0.071*(1 + 4.2/D^0.3) |
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