🛢️ What is a DAF Pressure Tank?
A DAF pressure tank (saturation vessel) is used to dissolve air into a recycled stream of water under pressure. This air-saturated water is then released into the DAF unit, where microbubbles help float suspended solids.
⚖️ Vertical vs. Horizontal Pressure Tank: Comparison
| Feature | Vertical Pressure Tank | Horizontal Pressure Tank |
|---|---|---|
| Footprint | Small floor space; taller profile | Larger footprint; shorter height |
| Air/Water Mixing Efficiency | Excellent vertical stratification helps improve saturation | Still effective but may need internal baffles to enhance efficiency |
| Drainage & Air Separation | Easier vertical separation of air pocket at top | May have air pocket buildup if not sloped properly |
| Maintenance Access | Easier access to bottom drain and top air vent | Can be harder to access internals depending on installation |
| Installation Flexibility | Better for tight mechanical rooms | Preferred in wide, low-clearance areas |
| Cost & Fabrication | Often more cost-effective in small-to-medium sizes | May be less expensive in large diameters (≥ 36″) |
| Orientation of Flow Path | Promotes vertical velocity gradient for clean air separation | Can have more turbulent flow without internal controls |
🏆 Which is Best?
✅ Best for Most Industrial Applications:
Vertical pressure tanks are typically preferred due to:
- Better air separation and venting
- Smaller footprint
- More efficient saturation in compact systems
Especially in metal finishing, food processing, and high-efficiency DAF designs, vertical tanks are favored.
🏗️ When to Use Horizontal Tanks:
- Low headroom environments (e.g., under mezzanines)
- Very large capacities where horizontal design is structurally more efficient
- Retrofits where horizontal alignment fits existing piping layout
🧠 Final Thoughts
Use vertical pressure tanks when:
- You need the best air separation
- Floor space is tight
- You’re aiming for plug-and-play saturation skids
Use horizontal tanks when:
- Height constraints prevent vertical vessels
- You’re dealing with very large flows (≥ 250 GPM) and need custom-built units
Would you like a graphic comparing both styles or help selecting a pressure tank size based on your flow rate?