AIRFIN Hub & Saddle Hardware
Tubular fine-bubble diffuser assemblies — AIRFIN Hub (inline) and C-Saddle (pipe-clamped) lines in 1.4 and 2.2 lengths.
AIRFIN Hub and C-Saddle are Ø63 mm tubular fine-bubble diffusers built for municipal and industrial wastewater aeration. A perforated flexible membrane over an ABS + uPVC support pipe releases 1–2 mm bubbles for high oxygen transfer, with no metallic parts exposed to the tank.
The Hub line mounts inline on a new air-distribution grid; the C-Saddle line clamps onto existing Ø90 mm pipework, making it the natural choice for upgrading a tired diffuser grid without re-piping. Both come in 1.4 and 2.2 lengths and accept selectable perforation sizes so the diffuser can be tuned to your flow and efficiency targets.
Key features
- Fine-bubble aeration with 1–2 mm bubble size for high oxygen transfer
- Selectable perforation size (0.65–1.5 mm) to tune air flow against efficiency
- ABS + uPVC Ø63 mm support pipe — corrosion-free, no metallic parts in the tank
- Hub (inline) and C-Saddle (pipe-clamped) mounting for new grids or retrofits
- 1.4 and 2.2 lengths to match tank geometry and process load
Outcomes
- Up to 27% SOTE at 3 m water depth
- Up to 9.8 kg O₂/kWh aeration efficiency
- 20 m³/hr standard design flow per 2.2 diffuser
- Retrofit existing grids without replacing distribution piping
Who it's for
Municipal and industrial wastewater treatment plants specifying or retrofitting fine-bubble aeration grids — from compact ETPs to large municipal STPs.
Models & variants
Two mounting families — Hub (inline on the air grid) and C-Saddle (clamped onto Ø90 mm pipe) — each in 1.4 and 2.2 lengths.
Inline-mounted 2.2 m tubular diffuser for the air-distribution grid.
| Spec | Value |
|---|---|
| Size | Ø63 × 2200 mm (2.6" × 86") |
| Perforation length & count | 1000 + 1000 mm / 28,160 nos. |
| Active surface area | 0.42 m² |
| Air flow range / diffuser | 4–20 m³/hr |
| Standard design flow @ 3 m | 20 m³/hr |
| SOTE @ 3 m (1 mm perforation) | 27% |
| Aeration efficiency | 9.8–8 kg O₂/kWh |
| Weight | 4 kg |
Performance envelope
Operating range across the 1.4 and 2.2 lines, rated at 3 m water depth.
| Metric | Min | Max | Unit |
|---|---|---|---|
| Air flow per diffuser (1.4: 2–15 · 2.2: 4–20) | 2 | 20 | m³/hr |
| Standard design flow @ 3 m (1.4: 10 · 2.2: 20) | 10 | 20 | m³/hr |
| SOTE @ 3 m (1 mm perforation) (1.4: 16.2% · 2.2: 27%) | 16.2 | 27 | % |
| Aeration efficiency | 5 | 9.8 | kg O₂/kWh |
| Active surface area | 0.26 | 0.42 | m² |
| Area of influence | 0.3 | 3.5 | m² |
| Weight | 2.4 | 4 | kg |
Common construction
Specifications shared across every Hub and C-Saddle model.
| Specification | Value |
|---|---|
| Membrane ID | Ø63 mm |
| Support pipe | Ø63 mm OD |
| Material of support pipe | ABS + uPVC |
| Perforation size options | 0.65 / 1 / 1.2 / 1.5 mm |
| Bubble size | 1–2 mm |
Materials & construction
| Part | Material | Details |
|---|---|---|
| Support pipe | ABS + uPVC | Ø63 mm OD corrosion-free support tube — no metallic parts in the tank. |
| Diffuser membrane | Perforated flexible membrane | Ø63 mm ID, micro-slit perforations (0.65–1.5 mm) producing 1–2 mm fine bubbles. |
| C-Saddle mount | ABS saddle clamp | Ø90 mm saddle diameter — clamps directly onto existing air pipework. |
Mounting & compatibility
- Air-distribution piping
- Hub mounts inline on the grid; C-Saddle clamps onto Ø90 mm pipe outer diameter.
- Tank depth
- Standard performance rated at 3 m water depth; available for other depths on request.
- Perforation selection
- Choose 0.65 / 1 / 1.2 / 1.5 mm slits to tune air flow against oxygen-transfer efficiency.
- Retrofit
- C-Saddle line drops onto existing grids without replacing the distribution piping.
Applications
Municipal STPs
Fine-bubble aeration for activated-sludge and extended-aeration sewage treatment plants.
Industrial ETPs
Oxygen transfer for high-load effluent treatment across process industries.
Grid retrofits
C-Saddle upgrades tired diffuser grids onto existing pipework with minimal downtime.
Frequently asked questions
Focus areas
- Waste Water Treatment