- The chart is calculated for fresh water at 15°C.
- Use actual bores rather than nominal pipe size.
- For stainless steel pipe multiply the numbers by 1.1.
- For steel pipe multiply the numbers by 1.3 .
- For cast iron pipe multiply the numbers by 1.7.
The losses are calculated for a fluid viscosity similar to fresh water
This chart will let you calculate the losses through various types of valves and fittings
| Equivalent Length of
Straight Pipe in Metres; For Calculating Friction Loss |
|||||||||
|---|---|---|---|---|---|---|---|---|---|
| Pipe Size (mm) |
Normal Elbow |
Long Radius Elbow |
Short Radius Elbow |
Return |
Tee 'T' |
Gate Valve Open |
Globe Valve Open |
Swing Check |
Foot |
| 20 | 0.5 | 0.3 | 0.6 | 1.5 | 1.5 | 0.3 | 6.7 | 1.5 | 1.5 |
| 25 | 0.5 | 0.3 | 0.8 | 2 | 1.8 | 0.3 | 8.2 | 2 | 2.3 |
| 32 | 0.8 | 0.3 | 0.9 | 2.6 | 2.4 | 0.6 | 11.3 | 2.6 | 2.7 |
| 40 | 0.9 | 0.4 | 1.1 | 3.1 | 2.7 | 0.6 | 13.4 | 3.1 | 3.4 |
| 50 | 1.1 | 0.5 | 1.4 | 4 | 3.4 | 0.8 | 17.4 | 4 | 4.6 |
| 65 | 1.4 | 0.6 | 1.7 | 4.6 | 4.3 | 0.9 | 20.1 | 5.2 | 5.5 |
| 80 | 1.5 | 0.8 | 2.1 | 5.5 | 5.2 | 1.1 | 26 | 6.1 | 6.7 |
| 100 | 2.1 | 1.1 | 2.7 | 7.3 | 6.7 | 1.5 | 34 | 8.2 | 8.8 |
| 125 | 2.7 | 1.2 | 3.7 | 9.5 | 8.2 | 1.8 | 43 | 10 | 11 |
| 150 | 3.4 | 1.5 | 4.3 | 11 | 10 | 2.1 | 49 | 12.2 | 14 |
| 200 | 4.3 | 2.1 | 5.5 | 15 | 13.4 | 3.1 | 67 | 16.5 | 18 |
| 250 | 5.5 | 2.4 | 7.3 | 19 | 16.5 | 3.7 | 85.4 | 20 | 22 |
| 300 | 6.7 | 3.1 | 8.5 | 23 | 20 | 4.3 | 98 | 24.4 | 27.4 |
