AODD Trouble-Shooting

What are the main reasons for the malfunction of an Air Operated Diaphragm Pump? Check our AODD Trouble-Shooting!

To ensure safe operation and the life of the pump and to form part of a preventative maintenance schedule, routine and complete inspection of the pump is recommended.

Routine Inspection can be done by frequent observation of the pump operation is required to detect problems. A change in sound of the running of the pump can be an indication of wearing parts as well as leakages and changes in performance.

The intervals for a complete inspection depend upon the operation conditions of the pump. The characteristics of the liquid, temperature, materials used in the pump and running time decide how often a complete inspection is necessary. Nevertheless, Tapflo recommend to inspect the pump at least once a year. As part of this inspection Air and Liquid Kits should be changed and Valve Kits should be changed once every 2 years.

Tapflo recommend stocking at least a Liquid and Air Kit to ensure that expensive down time is avoided.

 

PROBLEM POSSIBLE FAULT POSSIBLE SOLUTION
The pump does not run The air pressure is to low Increase air pressure via a filter-regulator
The air connection is blocked Check / clean air supply connection
Muffler is blocked Check / clean / replace muffler
Air valve is defective Clean / replace complete air valve
Dirt in the pump chamber Remove debris from the chambers
Diaphragm breakdown Replace diaphragm
The suction is bad Suction connection is not tight Tighten the suction line
Suction connection is blocked Clean suction line
Muffler is blocked Check / clean / replace muffler
Valve balls are blocked or damaged Check dimensions and shape of valve balls
Valve seats are worn
Pump starts with high pressure
Air in suction / discharge line
Dry suction against discharge pressure
Check dimensions and shape of valve seats
Start the pump slowly (see chapter 2.2 of manual)
Vent suction / discharge line
Wet the pump / start without discharge pressure
The pump runs irregularly Valve balls are blocked Check dimensions and shape of valve balls
Sealing in centre block
Air valve is defective
Replace sealing
Clean / replace air valve
Diaphragm breakdown
Valve seats are worn
Icing on the muffler
Replace diaphragm
Check dimensions and shape of valve seats
Improve air quality (see chapters 1.7.1 and 2.2.2 of manual)
Bad flow / pressure Pressure fall in air supply
Pressure losses on suction side
Air supply / air valve leaking
Increase air pressure via a filter-regulator
Check/change installation on suction side
Check / repair / replace air supply / air valve
Suction or air connection blocked Check / clean air supply / suction connection
Muffler is blocked Check / clean / replace muffler
Valve ball worn or broken
Valve seats are worn
Check dimensions and shape of valve balls
Check dimensions and shape of valve seats
Air in liquid Seal suction line; check / refill container
Diaphragm breakdown
Icing on the muffler
Check / replace diaphragms
Improve air quality (see chapters 1.7.1 and 2.2.2 of manual)
Liquid leaks from the pump Screws on the housing not properly  tightened
O-rings on manifolds damaged
Damaged diaphragm
Tension / stress form the installation
Check tightening torques of the screws
Replace O-rings
Check / replace diaphragms
Adjust installation, eliminate stress, when using a  dampener provide separate support for it (see  dampener IOM manual).
Liquid comes out of the  muffler Diaphragm breakdown Replace diaphragm
Diaphragm breakdown Wrong selection of material
Too high pressure in the installation
Long periods of dry running
Too high pressure on suction side
Contact us for information on material selection
Use air treatment system for protection
When dry, run pump slowly (see chapter 2.2 of manual)
Make sure there is pressure balance between the  air and liquid side of the diaphragm

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