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| Flow Resistance for Fittings |
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EQUIVALENT LENGTH OF WELDBEND ELBOWS AND STRAIGHT TEES |
| Nominal Pipe Size | Long Radius | Short Radius | Welding Tee (Branch) |
| 1" | 1.1 | 1.4 | 3.9 |
| 1 1/4" | 1.4 | 1.8 | 5.2 |
| 1 1/2" | 1.6 | 2.1 | 6.0 |
| 2" | 2.1 | 2.8 | 7.8 |
| 2 1/2" | 2.6 | 3.3 | 9.3 |
| 3" | 3.1 | 4.1 | 11 |
| 4" | 4.0 | 5.4 | 15 |
| 5" | 5.1 | 6.7 | 19 |
| 6" | 6.1 | 8.1 | 23 |
| 8" | 8.0 | 11 | 30 |
| 10" | 10 | 12 | 38 |
| 12" | 12 | 16 | 45 |
| 14" | 13 | 18 | 49 |
| 16" | 15 | 20 | 56 |
| 18" | 17 | 23 | 63 |
| 20" | 19 | 25 | 71 |
| 24" | 23 | 30 | 85 |
| 30" | 30 | 36 | 140 |
| 36" | 38 | 42 | 170 |
| 42" | 45 | 50 | 200 |
| 48" | 52 | 58 | 240 |
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| The information given in the chart above illustrates the resistance of fittings to the flow of liquids. The resistance given in the equivalent of the straight pipe, and should be assumed as approximate information. Allowances have been made up for the curvature of elbows, so that the resistance values should be added to the total center-to-end dimensions of the piping configuration. |
| Resistance of Pipe: | (6.6 + 6.4 + 6.6) = 19.6 |
| Resistance of Elbow: | = 6.1 |
| Resistance of Tee: |
= 23.0 48.7 |
| Therefore, the total resistance of the entire assembly to the flow of liquid would be equal to the resistance of 48.7 Linear feet 6" straight pipe. | |
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