Pressure Loss in Fittings and Valves Expressed as Equivalent Length of Tube, feet
|
Nominal or standard size, inches |
Fittings | Valves | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Standard Ell | 90° Tee | Coupling | Ball | Gate | Btfly | Check | |||
| 90° | 45° |
Side branch |
Straight run |
||||||
| 3/8 | .5 | – | 1.5 | – | – | – | – | – | 1.5 |
| 1/2 | 1 | .5 | 2 | – | – | – | – | – | 2 |
| 5/8 | 1.5 | .5 | 2 | – | – | – | – | – | 2.5 |
| 3/4 | 2 | .5 | 3 | – | – | – | – | – | 3 |
| 1 | 2.5 | 1 | 4.5 | – | – | .5 | – | – | 4.5 |
| 1-1/4 | 3 | 1 | 5.5 | .5 | .5 | .5 | – | – | 5.5 |
| 1-1/2 | 4 | 1.5 | 7 | .5 | .5 | .5 | – | – | 6.5 |
| 2 | 5.5 | 2 | 9 | .5 | .5 | .5 | .5 | 7.5 | 9 |
| 2-1/2 | 7 | 2.5 | 12 | .5 | .5 | – | 1 | 10 | 11.5 |
| 3 | 9 | 3.5 | 15 | 1 | 1 | – | 1.5 | 15.5 | 14.5 |
| 3-1/2 | 9 | 3.5 | 14 | 1 | 1 | – | 2 | – | 12.5 |
| 4 | 12.5 | 5 | 21 | 1 | 1 | – | 2 | 16 | 18.5 |
| 5 | 16 | 6 | 27 | 1.5 | 1.5 | – | 3 | 11.5 | 23.5 |
| 6 | 19 | 7 | 34 | 2 | 2 | – | 3.5 | 13.5 | 26.5 |
| 8 | 29 | 11 | 50 | 3 | 3 | – | 5 | 12.5 | 39 |
NOTES: Allowances are for streamlined soldered fittings and recessed threaded fittings. For threaded fittings, double the allowances shown in the table. The equivalent lengths presented above are based upon a C factor of 150 in the Hazen-Williams friction loss formula. The lengths shown are rounded to the nearest half foot.