Sump/Sewage/Grinder TDH Calculation Worksheet
Use the tables below to calculate Total Dynamic Head (in Feet) required.
- Use steps 1-3 and the following chart to calculate TDH from tables A & B below.
- Enter the TDH, in Feet, in the box under “Design Flow Rate” on the Pump Design Guide.
| Table A: | ||||||
| Friction Losses through Plastic Fittings in terms of Equivalent Lengths of Plastic Pipe |
||||||
| Type of Fitting |
1-1/4″ | 1-1/2″ | 2″ | 2-1/2 “ |
3″ | 4″ |
| 90 deg. Std Elbow |
7.0 | 8.0 | 9.0 | 10.0 | 12.0 | 14.0 |
| 45 deg. Std Elbow |
3.0 | 3.0 | 4.0 | 4.0 | 6.0 | 8.0 |
| Std. Tee |
7.0 | 9.0 | 11.0 | 14.0 | 17.0 | 22.0 |
| Check Valve |
11.0 | 13.0 | 17.0 | 21.0 | 26.0 | 33.0 |
| Union | 1.0 | 1.0 | 2.0 | 3.0 | 4.0 | 5.0 |
| Gate Valve |
0.9 | 1.1 | 1.4 | 1.7 | 2.0 | 23.0 |
| Table B: | |||||||
| Friction Loss per 100 Feet of Plastic Pipe | |||||||
|
Pipe |
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|
Flow Rate (GPM) |
1″ | 1-1/4″ | 1-1/2″ | 2″ | 2-1/2 “ |
3″ | 4″ |
|
2 |
0.3 | ||||||
|
3 |
0.6 | ||||||
|
4 |
1.0 | 0.3 | |||||
|
5 |
1.5 | 0.4 | 0.2 | ||||
|
6 |
2.1 | 0.6 | 0.3 | ||||
| 7 | 2.9 | 0.8 | 0.4 | ||||
| 8 | 3.6 | 1.0 | 0.5 | ||||
| 9 | 4.6 | 1.2 | 0.6 | ||||
| 10 | 5.5 | 1.5 | 0.7 | 0.2 | |||
| 12 | 2.1 | 1.1 | 0.3 | ||||
| 14 | 2.7 | 1.3 | 0.4 | ||||
| 16 | 3.5 | 1.7 | 0.5 | 0.2 | |||
| 18 | 4.4 | 2.1 | 0.6 | 0.3 | |||
| 20 | 5.2 | 2.5 | 0.9 | 0.3 | |||
| 25 | 3.8 | 1.3 | 0.5 | ||||
| 30 | 5.2 | 1.8 | 0.6 | ||||
| 35 | 2.4 | 0.8 | |||||
| 40 | 3.1 | 1.0 | 0.4 | ||||
| 45 | 3.8 | 1.3 | 0.6 | ||||
| 50 | 4.7 | 1.6 | 0.7 | ||||
| 60 | 2.2 | 0.9 | 0.2 | ||||
| 70 | 2.9 | 1.2 | 0.3 | ||||
| 80 | 3.7 | 1.5 | 0.4 | ||||
| 90 | 4.6 | 1.9 | 0.5 | ||||
| 100 | 2.3 | 0.6 | |||||
|
For |
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