How to Choose an AODD Pump: 5-Step Selection Guide
Table of Contents
Choosing the right AODD pump comes down to five decisions: what you're pumping, what material touches it, how much flow you need, whether your air supply can drive it, and any special requirements. This guide walks through each step.
Step 1: Define the Fluid
Start with the media — everything else follows from it:
- Chemical composition — acids, caustics, solvents, hydrocarbons?
- Temperature — hot media narrows elastomer options
- Viscosity — thick fluids need bigger passages and more air
- Solids — particle size determines minimum port size
- Shear sensitivity — latex, food, paint need gentle handling
Step 2: Choose the Wetted Material
Match the wetted material to the fluid's chemistry:
| Fluid Type | Body Material | Diaphragm |
|---|---|---|
| Strong acids / solvents | PTFE | PTFE |
| Water / wastewater / mild chemicals | Polypropylene | Santoprene / EPDM |
| Food / sanitary | Stainless steel (316L) | EPDM / Santoprene (FDA) |
| Paints / fuels / oils | Aluminium | Neoprene / Viton |
Step 3: Size the Pump
Size by required flow at your operating conditions. AODD flow is adjustable via the air supply, so pick the size whose maximum flow comfortably exceeds your duty point — you throttle down with air, not up with a bigger motor.
Consider suction lift (up to ~6 m dry) and discharge head. Long lines and high heads need more air pressure and reduce flow.
Step 4: Check Air Supply
An AODD pump is only as good as its air supply:
- Pressure: typically up to 8.4 bar (120 psi) — enough for most duties
- Volume: a 2" pump at full flow needs roughly 0.5-1.0 m³/min of free air; 3" pumps 1.5-2.5 m³/min
- Quality: filtered, regulated, lubricated air extends pump life
- Line size: undersized air lines strangle flow — match line diameter to pump size
Step 5: Special Requirements
- Hazardous areas — air-powered design is inherently safe; no ATEX motor needed
- Food contact — specify FDA-grade elastomers and Tri-Clamp connections
- OEM/private label — confirm branding, packaging and spec variations
- Dosing — add a flow regulator and pulse dampener for accuracy
- Pulsation-sensitive processes — install a pulsation dampener
Quick Sizing Table
| Port Size | Max Flow | Typical Air Use | Best For |
|---|---|---|---|
| 1/4"–1/2" | ~15 L/min | Low | Dosing, small transfer |
| 1" | ~60 L/min | 0.2-0.4 m³/min | Drum transfer, OEM skids |
| 1.5" | ~150 L/min | 0.3-0.6 m³/min | Plant transfer |
| 2" | ~300 L/min | 0.5-1.0 m³/min | Slurry, wastewater, bulk |
| 3" | ~680 L/min | 1.5-2.5 m³/min | Tanker offload, high volume |
Specification Checklist
Before contacting a supplier, have these ready:
- Fluid name and concentration
- Fluid temperature and viscosity
- Required flow rate (L/min or GPM)
- Suction lift and discharge head
- Solids content and max particle size
- Air supply pressure and volume available
- Any certifications (FDA, ATEX, CE)
Send this list to our team — we'll size the pump and quote within 24 hours.
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Written by
Ray ChanCCTV Buyer's Guide Author · Full-Color Night Vision Specialist. Ray helps global importers and integrators source factory-direct security cameras.