Discharge Pump Plumbing
Navigation
The Discharge Pump Plumbing page appears when your system uses a pump to deliver effluent from the dosing tank to the absorption area. Here you specify the delivery line diameter and the plumbing fittings in the delivery run.
Delivery Manifold Diameter
Select the diameter of the main delivery line from the dosing tank to the distribution manifold:
- 1.5" — available only when the absorption area is less than 1,200 sq ft
- 2.0" — required for larger systems
- 3.0" — for systems with high friction losses
The wizard calculates friction head loss for each available diameter and pre-selects the smallest allowed one where the total head loss is reasonable.
Minimum Discharge Hole Diameter
Select the minimum orifice hole size for the distribution laterals:
- 1/4" (0.250")
- 9/32" (0.281")
- 5/16" (0.313")
- 11/32" (0.344")
- 3/8" (0.375")
Larger holes reduce clogging risk but increase flow rate requirements.
Fittings
Enter the count of each fitting type in the delivery line:
| Fitting | Default | Notes |
|---|---|---|
| 90-degree elbows | 1 | Minimum 1 needed to exit the dosing tank |
| 45-degree elbows | 0 | For gentle direction changes |
| Couplings | Auto-calculated | Initially estimated as one per 10 ft of delivery distance minus 1 |
The quick-connect fitting (1 required) and tee (1 required) are added automatically and do not need to be entered.
Head Loss Summary
As you adjust fittings and diameter, the summary area updates to show:
- A head loss rate table showing friction loss (ft H2O per 100 ft) for each available diameter at the calculated flow rate
- The plumbing summary with total equivalent length and head loss
Tips
- Larger delivery diameters reduce friction but may dramatically increase the required dose volume.
- Check the head loss summary before proceeding. If the total head is very high, consider a larger delivery diameter.