Dry Operation
Operates indefinitely without liquid. Pump does not suffer damage during tank emptying and process startup phases.
Technical Guide
AODD Pump
Selection Guide
Step-by-step pump selection guide for flow rate, pressure, fluid properties and casing material selection.
Selection Criteria
5 Key Parameters for Choosing the Right Pump
A mistake in AODD pump selection means inefficient operation, premature wear or unexpected failure. To find the right pump, you need to evaluate five key parameters in sequence: flow rate, pressure, fluid properties, casing material and installation environment.
This guide explains each step with concrete examples and ensures that you know what to ask our technical team during the selection process.
- Step 1: Determine the required flow rate (lpm or m³/h)
- Step 2: System resistance and required pressure calculation
- Step 3: Fluid viscosity and particle size
- Step 4: Chemical compatibility and body material selection
- Step 5: ATEX requirement and installation environment
Working Principle
AODD Pump
7 Critical Advantages
Dead-head Protection
Pump stops when discharge line is closed, automatically resumes when opened. Safe operation under back pressure.
Self-priming
No need for liquid to be present in the suction line beforehand. Pump draws by itself.
No Seal Leakage
No mechanical seal leakage since there is no rotating shaft. Leak risk and seal maintenance cost are eliminated.
Operation Without Electricity
Requires only pressurized air. Provides natural advantage in ATEX Zone 1/2 explosive environments.
Gentle Pumping
Transfers shear-sensitive fluids such as latex, paint, polymer, and food products without damage.
High Solids Tolerance
Wide internal passages allow mud, sludge, and particulate fluids to be conveyed easily.
Selection Criteria
Considerations in Pump Selection
Flow Account
Determine hourly or minute transfer amount. Leave %20–30 flow margin; if viscosity is above 500 cPs, base on %70 of catalog flow.
Total Head Pressure (TDH)
Calculate the sum of static height, pipe friction losses, and filter/accessory losses. Air pressure must always be higher than fluid pressure.
Fluid Analysis
Viscosity, specific gravity, pH, temperature, and particle size directly determine selection. Manufacturer-approved elastomer required above 104°C.
Material Compatibility
Select body (PP/PVDF/Al/SS) and diaphragm (PTFE/EPDM/NBR) according to the fluid's chemical content. In case of diaphragm failure, fluid contacts the center body; center body material must also be checked.
Air Source
Leave minimum %20 margin in compressor capacity. Use moisture separator and oil filter in high-frequency operation to protect air quality and pump life.
Installation Environment
In ATEX Zone 1/2 environments, select ATEX certified pump. Metal body pumps must be grounded for static electricity.
Material Guide
Body Material
Selection Table
| Material | Compatible Fluids | Incompatible / Caution |
|---|---|---|
| PP (Polipropilen) | Acid, alkali, salt solution | Aromatic solvents |
| PVDF (Kynar) | Strong acids, halogenated solvents, high temperature | — |
| Alüminyum | Neutral liquids, petroleum based | Acid, alkali, salt solutions |
| SS 316L (Paslanmaz Çelik) | Mild chemicals, food, pharmaceutical | HCl and chloride environment |
Diaphragm Guide
Diaphragm Material
Quick Selection Table
| Application | Recommended Diaphragm |
|---|---|
| Acid / Alkali transfer | PTFE or PVDF + PTFE |
| Petroleum / Fuel / Oil | Buna-N (NBR) |
| Food & Beverage | PTFE, Hytrel or Santoprene |
| Water / Wastewater / Sludge | Neoprene, Polyurethane or EPDM |
| Aggressive chemical / Solvent | PTFE or Viton (FKM) |
| Paint / Ink / Varnish | Santoprene or PTFE |
| Hygienic / Pharmaceutical | PTFE + SS 316L body |
| High wear / Solid particles | Neoprene or Polyurethane |
Sectoral Applications
By Sector
Pump Configuration
| Sector | Typical Liquid | Recommended Configuration |
|---|---|---|
| Chemistry | Acid, solvent, aggressive chemical | PVDF/PP body + PTFE diaphragm |
| Food & Beverage | Sauce, syrup, beverage, cream | SS 316L + PTFE or Hytrel (FDA) |
| Paint & Coating | Paint, varnish, ink | Aluminum or SS + Santoprene |
| Mining | Mud, slurry, high solids | Aluminum/cast iron + Neoprene |
| Pharmaceutical / Pharmaceutical | Sterile liquids, API solutions | SS 316L + PTFE, hygienic design |
| Oil & Gas | Crude oil, fuel, waste oil | Aluminum + Buna-N |
| Galvanic / Coating | Acid baths, chemical solutions | PVDF + PTFE |
| Automotive | Lubricant, dye, solvent | Aluminum + Viton or Santoprene |
Pump Comparison
AODD vs Other
Pump Types
| Criteria | AODD | Centrifugal | Peristaltic | Piston Metering |
|---|---|---|---|---|
| Dry run | ✅ | ❌ | ✅ | ✅ |
| High viscosity | ✅ | ❌ | ✅ | ✅ |
| Solid particles | ✅ | ⚠️ | ✅ | ❌ |
| Dead-head protection | ✅ | ❌ | ✅ | ⚠️ |
| Self-priming | ✅ | ⚠️ | ✅ | ✅ |
| ATEX / Explosive atmosphere | ✅ natural | ⚠️ special motor | ⚠️ | ⚠️ |
| Precise dosing | ❌ | ❌ | ⚠️ | ✅ |
| High flow rate | ⚠️ | ✅ | ❌ | ❌ |
| Low cost | ✅ | ✅ | ⚠️ | ⚠️ |
| Easy maintenance | ✅ modular | ✅ | ✅ | ⚠️ |
Product Catalog
Plastic Diaphragm
Pump Models
Election Questions
Things to Consider When Choosing a Pump
-
The pump piston diameter, not the connection size, determines the flow rate. Models with 1/4"-3/8" connection operate up to 16 lpm, 3/4"-1" models up to 57-160 lpm, 1½" models up to 400 lpm, 2" models up to 565 lpm, 3" models up to 894 lpm. After determining the required flow rate, select the relevant flow rate class.
-
General rule of thumb: if the viscosity exceeds 500 cPs, take 70% of the catalog flow rate as a basis and choose a higher model. Above 2000 cPs it is recommended to consult our technical team.
-
The air consumption (Nm³/h) of an AODD pump depends on operating pressure and speed; it is read from catalog graphs. It is recommended to leave a minimum 20% margin when selecting a compressor. In high-frequency operation, a moisture separator and oil filter maintain air quality.
-
In sensitive process lines (flowmeter, before membrane filter, processes requiring precise dosing), pulse dampeners are recommended. In standard transfer and storage/discharge lines, pulsation generally does not cause problems.
-
Liquid beginning to pass into the air outlet is the most obvious sign that the diaphragm has ruptured. A sudden increase in air consumption indicates diaphragm or valve wear, while irregular pulsation points to valve ball or seat problems. Cracks or swelling during periodic visual inspection are also signs of failure.
-
AODD pumps offer a natural advantage for Zone 1 and Zone 2 ATEX environments because they do not contain an electric motor. However, metal-body pumps must be grounded for static electricity, an ATEX-certified model must be selected, and air quality (dry, oil-free) must be ensured. For PP/PVDF plastic bodies, a conductive version should be preferred.
-
(1) Selection without margin — leads to stall and early failure; leave a 20–30% flow margin. (2) Not applying viscosity correction — if a correction factor is not applied for fluids above 500 cPs, the pump will be insufficient. (3) Skipping chemical compatibility check — wrong material selection results in swelling, cracking, and pump loss. (4) Neglecting the suction line — an undersized filter or kinked hose directly reduces performance.