| Friction Loss of Fittings
(En español)
The amount of friction loss of fittings is important when designing PVC systems. The following table is provided by LASCO Fittings, Inc. to provide information regarding friction loss of fittings in equivalent feet of pipe.
| Friction loss of fittings shown in equivalent feet of pipe
 |
| Size |
Tee-Run |
Tee-Branch |
90° Ell |
45° Ell |
| 1⁄2 |
1.0 |
4.0 |
1.5 |
0.8 |
| 3⁄4 |
1.4 |
5.0 |
2.0 |
1.0 |
| 1 |
1.7 |
6.0 |
2.3 |
1.4 |
| 11⁄4 |
2.3 |
7.0 |
4.0 |
1.8 |
| 11⁄2 |
2.7 |
8.0 |
4.0 |
2.0 |
| 2 |
4.3 |
12.0 |
6.0 |
2.5 |
| 21⁄2 |
5.1 |
15.0 |
8.0 |
3.0 |
| 3 |
6.3 |
16.0 |
8.0 |
4.0 |
| 31⁄2 |
7.3 |
19.0 |
10.0 |
4.5 |
| 4 |
8.3 |
22.0 |
12.0 |
5.0 |
|
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This chart is based on a Hazen and Williams coefficient of 150.
For example, a 1⁄2 inch tee-branch fitting has the friction loss equal to 4 feet of pipe. Therefore,
100 feet of 1⁄2 inch pipe containing one Tee-Branch fitting has the same friction loss of 104 feet of
straight pipe.
Variations may result from installation techniques, actual fitting geometry, and inside diameter of
adjacent piping system. Due to these variations, this information should only be used as a reference
point.
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