Installing a pre-fractionated column (also called a separation or deaeration column) for a sewage pump system helps separate gases, solids, and liquids to improve pump efficiency and prevent airlock or clogging. Here’s a step-by-step guide:
Tools & Materials Needed
Pre-fractionated column (sized for your pump capacity)
PVC or stainless steel piping (compatible with sewage)
Check valves & gate valves
Vent pipe (for gas release)
Pipe sealant (Teflon tape or thread compound)
Wrenches, pipe cutter, level
Rubber couplings or flange adapters
Installation Steps
1. Choose the Correct Location
Install the column before the pump inlet (suction side).
Ensure vertical alignment (critical for proper separation).
Allow space for maintenance access.
2. Connect Inlet Pipe (From Sewage Source)
Use a gradual downward slope (1–2%) to prevent air pockets.
Install a gate valve before the column for flow control.
3. Mount the Column
Secure the column vertically with brackets or a support frame.
Ensure the outlet (bottom) connects to the pump inlet.
4. Vent Gases
Attach a vent pipe (top of the column) to release trapped gases (methane, H₂S).
Route the vent safely outdoors or to a treatment system.
5. Connect to Pump
Use a flexible coupling to reduce vibration transfer.
Install a check valve after the pump to prevent backflow.
6. Test the System
Fill the column with water to prime it.
Run the pump and check for:
Smooth flow (no gurgling = proper deaeration).
No airlocks (adjust venting if needed).
Leaks (tighten fittings as required).
Key Considerations
✔ Column Sizing – Must handle peak flow rates (consult manufacturer specs).
✔ Material – Stainless steel or reinforced PVC for corrosive sewage.
✔ Solids Handling – For high solids, add a grinder pump upstream.
Troubleshooting
| Issue | Solution |
|---|---|
| Pump loses prime | Check for leaks; ensure column is full. |
| Gurgling noise | Increase vent pipe diameter. |
| Clogging | Install a pre-filter before the column. |
Why Use a Pre-Fractionated Column?
Prevents airlocks in centrifugal pumps.
Reduces wear by separating abrasive gases/solids.
Improves efficiency in wastewater systems.
